Patent Application
20230388640
The present invention relates to motion tracking and, more particularly, to a motion tracking solution capable of allowing a videographer to record high-quality video of an athlete participating in a sporting event.
As long as people have been participating in sporting events and activities, people have wanted to record their activities for viewing later and capturing these moments to share and to capture fond memories. This is particularly true for parents of children participating in youth sports who want to record their children playing. Solutions to date have been generally unsatisfactory for providing high quality at a low cost and ease of use for the player. For example, hiring a professional videographer to record the event generally provides a satisfactory solution for the quality of the video recording, but unsatisfactory in terms of the cost. As such, the primary solution to this problem has been for the parent to be the videographer. While satisfactory in terms of the cost, this compromises recording quality and detracts from the parents viewing experiencing. Also the existing location transmitter packaging has been non-compliant with uniform requirements and uncomfortable for the athlete. Various device-based tracking solutions have been proposed to assist with videography but have not provided a satisfactory solution.
For example, U.S. Pat. No. 5,179,421 to Parker et al. (ParkerVision, Inc.) issued Jan. 12, 1993 shows a camera tracker with a remote that a user can put on the belt or in a pocket and have a camera follow the user around by focusing on the remote, panning 360° in the horizontal and tilting in the vertical position. The remote includes an IR transmitter and tracking is accomplished with an array of receivers that find the “peak” and track the remote by repetitively calculating the angular displacement with respect to a reference angle to provide direction and rate of movement. The IR sensor requires line of sight and is therefore not usable for a sport played on a field with many players.
United States Patent Application 20110228098 by Lamb et al. published Sep. 22, 2011 shows a method to track an object with a video camera by a combination of using an IR sensor to determine a position of a tracking tag with an infrared (IR) transmitter; and automatically adjusting orientation of the camera as a function of the position of the IR transmitter as it follows movement of the object and the position of a recognized feature within the field of view. Systems that use infrared red light sources (IR) require line of sight to the target, which makes it impossible to track a participant on a crowded sports field and is limited for outdoor usage and range, and therefore not a good use for the application.
U.S. Pat. No. 10,560,621 to Rao et al. (Symbol Technologies) issued 11 Feb. 2020 shows a tracker for controlling a remote camera through a network. Here the tracker may be a mobile device 102 (
U.S. Pat. No. 9,697,427 to Stout et al. (Jigabot, Ltd.) issued 4 Jul. 2017 shows system for tracking a cinematography target using multiple IR emitters worn by a target subject. Again, this system (as with any IR system) requires line of sight to the target which will be impossible on a crowded sports field and limited for outdoor usage and range.
U.S. Pat. Nos. 9,007,476 and 9,294,669 both to Glover (H4 Engineering) issued Apr. 14, 2015 and Mar. 22, 2016 show a remotely controlled automatic camera tracking system. The patents show the basic method of using a motorized base to mount and orient a camera based on signals sent from a remote tracking tag. The remote tag and base utilizes GPS data for location calculation, which has been used for many years for tracking purposes. The Glover et al patents allow for the calculation to take place in the remote control rather than the base to reduce power usage in the remote sensor and allows the user to start and stop a traditional camera or camcorder attached to the base and also control of zoom functions in the camera if possible. Although a good approach, it is not necessary and adds to the complexity of the system and reduces reliability. It does not utilize the functions available in a smart phone as proposed here and the integrated sensors and blue tooth connections to the control base which can provide increased integration and control of the built-in camera in the smart phone. The Glover et al patents also utilize an armband for the transmitter. Tracking tags worn by the person or player that look like a small black box worn on the arm of a player with a strap or arm band will not be accepted by the game officials (referees), and a tracking tag attached to the uniform will also cause discomfort to the player and reduce their playing level. A tracking tag integral to an athletic pad would be more appropriate for most sports or other activities.
U.S. Pat. Nos. 8,704,904 and 9,253,376 and 9,800,769 to Boyle et al. (H4 Engineering) issued Apr. 22, 2014, 2 Feb. 2016 and 24 Oct. 2017, respectively show a system for automatic pointing of a camera using an initial calibration where remote unit is collocated (this was corrected later to allow for 2 sensors—one in the remote and one in the base eliminating the need for collocated sensor to start) with the base unit and utilizes GPS tracking and coupled with IR sensors, collimated light beams or imaging software all of which require line of sight to the target and thereby not useful on a crowded sports field with many players wearing the same uniforms or helmets. In addition, the GPS tag worn by the target is not sport appropriate and may cause issues with the game officials and general discomfort
U.S. Pat. No. 10,560,621 to Rao et al. issued Feb. 11, 2020 supplements the motion tracking component with image recognition. The computational overhead required for real time image processing is huge, and so the foregoing are only partial solutions and the range of use is limited and not sufficient for an outdoor sporting event (football field) with many similar people in identical uniforms.
What is needed is an economical and efficient tracking solution that provides precise initial calibration of the relative positions of the base unit and GPS-transmitting tracking tag, and which then uses it in combination with refined tracking method to provide smooth tracking of an athlete in motion, even when that athlete is mixed in with other participants wearing similar uniforms and at long distances. The remote target sensor needs to be constructed and packaged such that the unit can be worn by athletes participating in sports without infringing on the sports guidelines and rules for proper uniforms and equipment and creates no issues with sports officials and referees. Systems requiring direct line of sight (IR systems) or facial recognition or imaging technologies will not work when applied to a crowded sport field (soccer, lacrosse, football, etc.). The present solution utilizes improved control in the base station coupled with a sport-appropriate GPS remote tracker tag and the sensors and invokes control capabilities available in existing “smart devices” such as smart phones. People will use the cameras on their phones for the recording and the system will use it for operation. By utilizing the “smart” phone the videographer also gets to use the other “smart phone” functions to easily edit and share video files via the internet—easily send videos to coaches for example.
An object of this invention is therefore to overcome the foregoing inconveniences by providing a system with a motorized base unit with a smart device mount for automatically orienting the smart device camera toward a moving target and taking pictures or video.
For purposes of definition, “smart device” means any electronic device having an on-board processor and memory, and an on-board camera, and being capable of communicating to other smart devices or networks via a wireless protocol such as Bluetooth, Zigbee, NFC, Wi-Fi, LiFi, 5G, etc.
A “portable smart device” means any hand-carried smart device.
A “smart phone” means any smart device with cellular communication capability.
The motorized base unit tracks a moving target with the smart device and takes pictures or video. The target (e.g., a child playing soccer) wears a tracking tag comprising a GPS chip and transmitter packaged inside an athletic pad, e.g., a shin pad for soccer. The base unit receives the transmitted GPS data and orients the smartphone camera at the target. The base unit includes a main controller with microprocessor for calculating an updated pointing angle and angular velocity for the smart phone based on update location information from the remote tag sensor. The current pointing direction of the smart phone is provided via an orientation sensor mounted to the smartphone mounting bracket. The orientation sensor is a potentiometer that provides absolute rotation-position information on the mounting bracket. Alternatively (or additionally), the current pointing direction of the smart phone is provided directly by the smart phone itself, and is transmitted wirelessly to the base controller The orientation data from the smart phone may include true and magnetic compass heading and yaw, pitch and roll data. Collectively, the orientation data from the sensor and from the smart phone provides information about the orientation of the smart phone device, and thereby provides intermittently-updated pointing direction as the motor rotates. In addition, the current location data of the base unit is wirelessly transmitted from the smart device to the base unit main controller, or alternatively is obtained locally from a GPS receiver mounted in the base unit. Given 1) the current location of the base unit; 2) the current pointing angle of the smartphone device; and 3) the GPS location of the remote target sensor, the base unit main microprocessor controller can calculate the correct angle that the smart phone should be directed to or “pointed at” to have the target in line and pointed to by the smart phone camera. This new pointing direction is translated to a control signal that turns an electric stepper motor. As the process is repeated, the smart phone device will “follow” or track the target. The video functions in existing smart phone devices can be employed and the video files saved on the smart phone for future viewing, editing, emailing, uploading to social media etc. In addition, a specialized software application (App) may be installed in the smart device to take advantage of the present system capabilities.
The smart phone App includes a “Highlight” mode of operation by which it continuously buffers video for a selectable amount of time (e.g., 10 seconds, 30 seconds, etc.) as set by the user. When the videographer presses a “highlights” button the selected duration of buffered video, as set by the user, is constantly and temporarily held in memory via FIFO (first in, first out) arrangement. Given the foregoing, when the “record” button is pressed, the App will continue recording for a user specified amount of time (45 secs, 2 minutes etc.) and upon completion this second video file is automatically appended to the first video file held in the buffer memory, the combination of the appended first and second video files being saved as a single recorded video file that includes both video before the record button was pressed and the video recorded thereafter. The video file is saved to the smart phone device camera roll and also available for emailing or texting to anyone. This feature allows users who are slow to react to nevertheless recapture a great moment and append it to their recorded video.
The base unit is portable, battery operated, and sized such that it can be easily transported and mounted on a traditional standard tripod. The tracking tag (GPS, communication chips, battery) is packaged into an athletic pad that the target subject wears during a sporting event or any event. In an embodiment, the tracking tag is a shin pad for soccer. However, the tracking tag may alternately be an elbow pad for use in lacrosse, a leg pad for use in football, or any other general-purpose athletic pad for use with other sports without departing from the scope or spirit of the invention.
Additional aspects of the present invention will become evident upon reviewing the embodiments described in the specification and the claims taken in conjunction with the accompanying figures, wherein like numerals designate like elements, and wherein:
The present invention is a motion tracking solution capable of allowing a videographer to record high-quality video of an athlete participating in a sporting event. An athlete (e.g., a child playing soccer) wears a tracking tag comprising a GPS chip and transmitter. The GPS tracking tag periodically transmits GPS data to a base unit, which receives the transmitted GPS data and automatically orients the smartphone camera toward the moving athlete for taking pictures or video. The base unit generally includes a housing, an articulating smartphone mounting bracket mounted to the housing, a stepper-motor for turning the mounting bracket, and an orientation (pointing direction) sensor for determining current pointing direction of the smart phone, a processor including memory and associated electronics, and optionally a GPS chip.
Current location data of the base unit is wirelessly transmitted from the smart device to the base unit, or alternatively is obtained locally from the GPS receiver mounted in the base unit. Current location of the remote target sensor is wirelessly transmitted from the target to the base unit. The orientation sensor (mounted to the smartphone mounting bracket) provides continuously-updated rotation-position information of the mounting bracket, while the smart phone data transmitted wirelessly to the base controller includes true and magnetic compass heading and yaw, pitch and roll. data. The combined orientation data allows extremely accurate calculation and continuous updating of the current pointing angular direction of the smart device even as the motor rotates. Given 1) the realtime location of the base unit; 2) the realtime pointing angle of the smartphone device; and 3) the GPS location of the remote target sensor, the base unit processor calculates 1) an updated (delta) pointing angle; and 2) an updated (delta) angular velocity for the smart phone based on updated location information from the GPS tracking tag. By using the current location data of the base unit which is wirelessly transmitted from the smart phone device to the main controller in the base (or derived from an onboard GPS receiver on the base unit main controller) and current pointing angle of the smartphone device coupled with the GPS location of the remote target sensor, the base unit processor is able to calculate the correct angle that the smart phone should be directed to or “pointed at”, and also the velocity needed, so as to keep the target centered in the smart phone camera field of view. This new pointing direction and velocity are translated to a pulse-width-modulated (PWM) control signal that turns the stepper motor. The process repeats, resulting in the smart phone “following” or tracking the target. Video functions in the smart phone can be actuated and the video files saved on the smart phone for future viewing, editing, emailing, uploading to social media etc. The device is portable, battery operated, and sized such that it can be easily transported and mounted on a traditional standard tripod. The tracking tag (GPS, communication chips, battery) is packaged in an athletic pad that the target subject wears as part of their standard uniform.
In operation, given the communication architecture of
The smart phone 3 may be any of various “smart” phone devices (Apple iPhone, Samsung Galaxy, LG and others), and is preferably equipped with an installed software App provided as part of the system herein to control said video and other functions.
In an embodiment the function of the pointing direction sensor 29 monitoring angle of shaft 26 may be replaced or supplemented by the smartphone 3 itself which wirelessly transmits to the base unit 2 controller orientation data, including true and magnetic compass heading and yaw, pitch and roll data, thereby providing information about the orientation of the smart phone device and allowing calculation of pointing angle via an installed App (provided that the smart phone 3 is of a type having an internal compass and can output orientation).
As seen in
Adjustable device mounting bracket 24 rotates above housing 22 on shaft 26 for generic use with a variety of smart phone devices 3, and the shaft 26 protrudes down through main board to a lower board containing low voltage electric stepper motor 49, and rechargeable battery 41. Shaft 26 is preferably journaled into a bearing 53 on the lower board for frictionless rotation. In addition, for vibration-free operation the shaft 26 is damped. This is accomplished with a belt-drive inclusive of a rubber belt 57 connected between a small pulley 58 on the motor 49 shaft and a large pulley 56 on the shaft 26 of the adjustable device mounting bracket 24, the pulley size differential providing speed reduction and increased torque. In another embodiment a spur gear, worm gear, gear motor or other method of speed reduction could be used.
Battery 41 is connected to a charging controller IC chip 43 that manages and recharges the battery 41 by attaching a cable as is typical for charging smart phones by the user. For example, a mini-USB connection is very commonly used for this purpose.
Motor driver controller 45 may be a commercially-available two-axis motor controller/driver module capable of supporting a bi-phase bipolar stepper motor 49, a variety of which are commercially available. For example, a Toshiba TB67S128FTG microstepping bipolar stepper motor drive controller 45 will suffice.
In an alternate embodiment a second motor and motor driver controller 45 (or a second motor and dual-motor 3-axis motor driver controller) can be added to additionally provide control and position along vertical axes, thereby allowing the smart device to track up and down vertically in conjunction with the horizontal. The very same approach to control can be used for vertical operation, thereby allowing the device to track in three-dimensions.
An optional GPS chip 48 may be provided on the main board to provide current location data of the base unit 2 to processor 42. Preferably, as indicated above, location data for the base unit 2 is wirelessly transmitted from the smart device mounted in bracket 24 to the base unit 2. However, the location data for the base unit 2 must be accurate for present purposes and many smart devices employ low grade GPS chips that do not provide the requisite accuracy. One skilled in the art will understand that more accurate location data of the base unit 2 can be obtained locally from the GPS receiver 48 mounted in the base unit 2, can be obtained remotely from a cellular service, or from any other third party source of more accurate location data.
The initial orientation and pointing direction of smartphone mounting bracket 24 is unknown at startup and so the smartphone device mounting bracket 24 may be manually aligned with the remote target sensor (orientation sensor 29). A detent button 44 is positioned on housing 22 and may be pressed to indicate alignment. Alternatively, a soft button 44 may be provided by the App on smart phone 3 for interaction with the user. Switch 44 causes the current pointing angle to be captured using orientation sensor 29, and used alone or in conjunction with the angular pointing direction calculated from the orientation data provided by the smart phone and transmitted wirelessly to the base controller (true and magnetic compass heading and yaw, pitch and roll data). In an embodiment orientation sensor 29 is a potentiometer mounted to the bottom of the smart phone mounting bracket shaft 26. The potentiometer 29 is a variable resistance device that provides absolute position information with a shaft and with three wires connected to it. One wire is the nominal system control voltage for the system—3.3 VDC or 5 VDC, the other wire is system voltage ground and the third wire is referred to as the “wiper” which is a variable resistance/voltage output. As the shaft rotates, the resistance varies between the “wiper” and the system voltage and ground and the voltage output on the “wiper” terminal varies accordingly. The variable voltage output provides an absolute value of the current shaft position and thereby the pointing direction of the smart phone device mounting bracket 24. The potentiometer-type pointing direction sensor 29 offers the advantage of not requiring a homing sequence or similar initial location calibration as would be required when using relative positioning devices like encoders. Also, using an absolute positioning device like the potentiometer for pointing direction sensor 29 ensures that the unit never loses its location pointing direction or gets “lost” even with disruptions during use, which is not true of systems using relative pointing devices. The benefits of a continuously-variable potentiometer sensor 29 become essential when tracking a fast-moving target with a camera. In another embodiment, the pointing angle of the smart phone mounting bracket 24 may be obtained from the smart phone 3 directly using its available magnetometer output (compass) and orientation data calculated internally in the smart phone device utilizing the internal sensors magnetometer, gyroscope, accelerometer and calculated values for pitch, yaw, and roll of the smart phone device. The smart phone orientation data is transmitted wirelessly to the main controller in the base unit 2 via bluetooth or other similar wireless connections. In this case no orientation sensor 29 is required. In a preferred embodiment (described in detail below) both orientation data sources are used as a cross-check and backup and provide information for drift compensation and error checking. In another embodiment, additional information from the smart phone 3 including Quaternion (orientation), Accelerometer, and Gyroscope data are used to determine current pointing angle and mounting bracket angular velocity to improve target tracking.
In addition, housing 22 is preferably equipped with a base mounting bracket 60 suitable for releasable mounting on a conventional tripod.
The protective pad 10 is molded in a partial convex arch to conform to a limb such as, for example, the elbow, forearm or shin, as illustrated, and preferably includes four molded recesses 72 open inwardly to the arch for seating the electrical components of GPS tracking module 12. One skilled in the art will understand that other electronic component mounting schemes may be used. The electrical components of GPS tracking module 12 are individually seated in the molded recesses 72, adhered (or molded) therein, and covered by a protective foam padding layer 74 as seen in
At the base unit 2 (
In sum, the base station processor 42 uses the GPS location/timing data from GPS tracking module 12 to calculate a pointing angle between the motorized base unit 2 and the GPS tracking module 12 using trigonometric math equations. The current pointing angle of the smart phone 3 is known from the orientation sensor 29 or internal Magnetometer and other resident sensors (e.g., on-board compass) in the smart phone device. As the athlete moves, the GPS tracking module 12 moves, and new GPS coordinates and timestamps are transmitted ten times a second to the base unit 2. Each time, the base unit 2 processor computes a new required pointing angle and velocity needed to reorient and control smart phone mounting bracket 24. The pointing angle value is used to position the motor shaft 26 and “point” the smart phone device mounting bracket 24, and the computed velocity is used to calculate the needed speed of the motor 49 to reorient smart phone mounting bracket 24 and thereby the smart phone 3 to track the target. As the data is updated and angle and velocity recalculated, the smart phone 3 effectively and smoothly follows or “tracks” the remote GPS tracking module 12 as it moves. Tracking as a function of velocity is superior to prior art units that do not control based on velocity but rather use only point-to-point movements. The foregoing technique is implemented by software resident in the base station processor 42.
With reference to
Program flow proceeds to
At step 205 the base unit 2 processor 42 polls the smart phone 3 for its gyroscope/compass heading and GPS data, and at step 210 processor 42 compares its calculated bearing from the base unit 2 to the GPS tracking tag 10 to the gyroscope/compass heading transmitted from smart phone 3, and calculates a “correction angle.” At step 225 processor 42 translates the “correction angle” into pulse commands (number and direction of pulses required to cause the motor 49 to adjust the correction angle, e.g., 200 pulses clockwise to turn one half revolution). Processor 41 sends a complete set of pulse commands (number, direction, rate) to the motor driver controller 45 which controls the motor 49 to implement the pulse-width modulated (PWM) command set. Processor 41 stores this initial alignment position as the “first pointing angle.”
One skilled in the art should understand that using two sets of GPS data available from both the smart phone 3 (or base unit 2) plus GPS tracking module 12 offers many advantages including not requiring the GPS tracking module 12 to be collocated or calibrated at the base unit 2. The same is true of the use of gyroscope/compass data from the smart phone 3 as this allows the base unit 2 to know in which direction the smart phone mounting bracket 24 and smart phone 3 are actually pointing. Thus, by utilizing the gyro/compass data from the smart phone 3 the initial pointing angle is known and videography can begin without any initial alignment procedure. Using the gyro/compass data from the smart phone 3 facilitates an AUTO-alignment function (described below in regard to
On the other hand, if smart phone 3 lacks a gyroscope and magnetometer output and cannot provide orientation data, flow proceeds to step 190 where the user is prompted on their smart phone 3 to manually turn the smart phone mounting bracket 24 until the target (athlete) is centered in the field of view (and appears centrally on the smart phone 3 viewing screen). The smart phone App provides some functionality including a “Target Aligned” button, and at step 200 this is pressed to indicate manual alignment. At step 210 the processor 42 reads the smart phone mounting bracket 24 position from the shaft-mounted potentiometer and stores this value as “first pointing angle.”
In either foregoing case of manual alignment or automatic alignment, the smart phone mounting bracket 24 is properly positioned and processor 42 stores initial alignment position as the “first pointing angle.” Process flow proceeds to
With alignment operation complete, program flow proceeds to
At step 320 processor 42 reads the current pointing angle from smart phone mounting bracket 24 orientation sensor 29 and/or captures the current compass heading and smart phone orientation data from smart phone 3 as explained in regard to
At step 330 processor 42 calculates a new delta angle change from the “first pointing angle” to the “second pointing angle.” Processor 41 also calculates from the timestamps a new velocity value based on rate of change from the “first pointing angle” to the “second pointing angle” and updates the velocity value accordingly.
Control of the motor 49 is critical to providing good tracking and keeping the target and the smart phone mounting bracket 24 aligned. As the bae unit 2 processor 42 receives new updated GPS location data from the GPS tracking module 12 and, coupled with the GPS location for the base unit 2 (derived from the smart phone 3), and the current pointing angle for the smart phone mounting bracket 24, a new “delta” pointing angle and new “delta” angular speed is calculated. The delta pointing angle is calculated by the processor 42 using the following equation with longitude and latitude data derived from the corresponding GPS data for the GPS tracking module 12 and base unit 2:
New bearing calculated=a tan 2(y,x)
y=sin(lon2−lon1)*cos(lat2) and
x=cos(lat1)*sin(lat2)−sin(lat1)*cos(lat2)*cos(lon2−lon1)
After a new bearing is calculated as above, the correction angle is calculated as the new required position or bearing versus the previous bearing or pointing angle. The time from the last GPS data and the new GPS is stored and compared. In an example the delta angle for correction may be 2 degrees. The corresponding pulses required for the PWM signals for stepper motor 49 to match the required target location are calculated as steps required=degrees required*steps/degrees*, and the motor driver circuit board 45 is commanded to provide the required number of pulses to the motor 49 to change and rotate the direction of the smart phone mounting bracket 24 such that it points in the new required pointing angle to align with the remote target sensor. The rate of the movement of the smart phone mounting bracket 24 from point to point is determined from the calculated target velocity and used to set the speed to match the target movement rate, thereby providing smooth video and excellent tracking.
In addition it is desirable to match the moving velocity of the target athlete rather than simply rotating the smart phone mounting bracket 24 from point to point. Consequently, In addition to the GPS data, the timestamps of that data are also communicated to the processor 42 (or smart phone directly). This allows calculation of timing differential and then the actual speed of the moving target.
Next at step 340 processor 42 translates the “delta velocity” and “delta angle” into pulse rate commands (number and direction of pulses required to cause the motor 49 to adjust the delta angle velocity). The motor controller circuit board 45 is sent a continuous stream of pulses from the main microprocessor 42 using a variable continuous PWM (pulse width modulated) output. The frequency of the PWM is varied based on the calculated target speed. This provide for smooth tracking of the remote target athlete (lacrosse or soccer player for example).
Importantly, at step 350 the processor 42 checks the calculated PWM values and dynamically adjusts the microstepping factor on the motor control board 45 to ensure the motor 42 is operating in its ideal frequency range (known as “variable dynamic microstepping”). Microstepping is a way of controlling a stepper motor more smoothly than in full steps, e.g., the motor may be microstepped using 1/32 steps. Microstepping results in less vibration, makes noiseless stepping possible, and makes smaller step angles, lower speeds and better positioning possible. The net result is vastly better video quality. On the other hand, stepper motors have an optimum range of operational frequencies. The calculated velocity value may vary greatly depending on the difference in target minimum and maximum speeds, the distance from the target to the base unit 2 and smart phone mounting bracket 24, etc. Stepper motors operate best in a certain range of speeds and also when controlled with a PWM frequency within a certain frequency range. The motor controller 45 can be configured to operate in micro-stepping mode. Microstepping is a technique where the motor control board can make the stepper motor operate in such a way that additional steps are allowed within the same number of “real steps” (microsteps) to provide better control and operation at lower speeds. For example, a stepper motor designed for 200 steps per revolution can be controlled to operate with ⅛ microstepping, for example. This would make it such that the stepper motor 42 would now require 200×8=1600 steps per revolution or conversely, the motor would operate at slower speed (⅛) when provided with a same given PWM pulse frequency operating in full step mode. The present invention takes advantage of these factors and provides variable dynamic stepper motor mode control to provide the best possible control and smoothest operation. If the required speed is high for example, the main microprocessor controller will place the motor control board (15) in a lower or even full step (1:1) control mode so the stepper motor goes faster for a given PWM output and keeps the PWM frequency range in the best operating range for the stepper motor and calculated by the main processor (12). If the speed is required to be slow, the microprocessor will determine this and change the mode to a higher ( 1/32 for example which drives the motor 32 times slower for a given PWM frequency than operating in full step mode) microstepping mode again keeping the PWM frequency in the optimal range. This variable dynamic microstepping minimizes steps while maintaining them within the motors optimum range.
Processor 41 sends a complete set of microstep pulse commands (number, direction, rate) to the motor driver controller 45 which controls the motor 49 to implement the pulse-width modulated (PWM) command set.
Finally, at step 360 processor 42 update the previous time, distance, location, pointing angle, and velocity with new values and continuously repeats the process of
Preferably, the wireless communications between the remote communicating GPS tracking module 12 and base unit 2 are “paired” together automatically at start to ensure that only communication with said transmitter and “paired” receiver are used, and to allow multiple units to operate in the same area without interfering with the operation of other units. Similarly, data is sent by wireless communications between the smart phone 3 and base unit 2 and there are paired together to ensure only communication with each other, and to allow multiple units to operate in the same area without interfering with the operation of other units. Alternatively, a wired connection may be used by a wired connection (Apple lightning connector as an example).
Inasmuch as the present invention is designed to track an individual player, the installed software App provided as part of the system includes a specialized “highlights” mode of operation. This mode is selected via the software App via the user screen on the smart phone or via a pushbutton on the base station or via a verbal command to the smart phone device. In this mode of operation, the smart phone camera continuously buffers (temporarily saving a set amount of) video, the buffer size being configured during setup. The buffer size may be any time value from 10 seconds to 30 minutes. When the player wearing the GPS tracking pad does something that the videographer likes and would like to capture, they press the “highlights” button and the buffered video immediately preceding and following is saved as a recorded video file (for example, the previous 2 minutes so the user can see the play developing, and also the next 5 minutes or any time until the highlights button is pressed again or the highlight function times out and stops automatically as set up in the configuration file for the APP software by the user (5 minutes for example)). This reduces the video file sizes and allow the user to get the highlights they want rather than having to review and entire game video file.
In another embodiment of the invention an electronic compass may be added to the base unit 2 to provide the compass information for the main microprocessor 42. The compass information may be likewise communicated to the processor 42 via a wired or wireless connection and the auto alignment process will proceed as noted above.
In still another embodiment of the invention, the base unit 2 may be passive and merely transfer location and pointing angle data to the smart phone 3 located in bracket 24, allowing the smart phone 3 to complete the foregoing calculations and transmit final PWM data back to the base motor controller using the App (software program running on the smart phone 3). Compass heading data and other available data is already captured and available in the smart phone device. The resulting calculated required motor position and velocity commands are then sent to the microprocessor 42 in the base unit 2.
In still another embodiment of the invention, the GPS tracking module 12 may communicate directly to the smart phone 3 located in bracket 24 rather than to and through the base unit 2, using the built-in wireless communication interfaces in the smart phone 3.
In yet another embodiment the distance value (and delta distances) from base unit 2 to GPS tracking module 12 is communicated to the smart phone 3 via wireless communication as noted prior, and the value is used by the App operating on the smart phone to determine the best possible zoom value for the integrated video camera in the smart phone 3. Alternatively, the App operating on the smart phone may simply suggest an external lens available for use with smart phone 3 to enhance the range of the video camera functions. The present invention may also call upon the voice interaction and recognition capabilities of the smart phone 3 to provide hands free control of the system during operation. For example, when the target athlete does something very good the user simply speaks to the device at the time and says “Highlight”. The location and time in the video recording are noted for quick reference and locating later during viewing time. Other commands are including “Pause”, “Restart”, etc.
In another embodiment, the present invention may utilize the image recognition capabilities of the smart phone 3 to provide an additional or supplemental means of target tracking at closer distances. If the controller or smart phone determines that the remote target sensor is sufficiently close where GPS locating may not be best method and the internal image recognition in the smart phone is operating, the system will switch over to image recognition tracking on the fly and determine the best pointing angle for the smart phone device and command the motor accordingly and also switch back when the distance is further and best suited for GPS control.
In all the foregoing embodiments the motorized base unit 2 receives the transmitted GPS, orientation, and timestamp data and orients the smartphone camera at the target to provide smoother more accurate tracking of an athlete in motion.
Having now fully set forth the preferred embodiment and certain modifications of the concept underlying the present invention, various other embodiments as well as certain variations and modifications of the embodiments shown and described will obviously occur to those skilled in the art upon becoming familiar with the concept. For example, as indicated above the athletic protective pad 10 may be modified in construction and form to serve as a shin pad, elbow pad, forearm pad or leg pad as required for different sports but of similar construction and function as noted herein.
It is to be understood, therefore, that the invention may be practiced other than as specifically set forth herein.
The present application is a division of U.S. patent application Ser. No. 17/316,837 filed May 11, 2021, which in turn derives priority from U.S. provisional application Ser. No. 63/023,408 filed 12 May 2020.
| Number | Date | Country | |
|---|---|---|---|
| 63023408 | May 2020 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 17316837 | May 2021 | US |
| Child | 18225434 | US |
