Patent Grant
8472039
This application claims priority under 35 U.S.C. §119(a) from Korean Patent Application No. 10-2007-0069361, filed on Jul. 10, 2007, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.
1. Field of the Invention
The present general inventive concept relates to a copy apparatus having a copy prevention function and a copy prevention method thereof. More particularly, the present general inventive concept relates to a copy apparatus which performs a printing operation by comparing a ratio of patterns in an image with a ratio of pre-stored copy prevention patterns, and a copy prevention method thereof.
2. Description of the Related Art
In general, copy apparatuses, such as scanners, copiers, and multifunction apparatuses, print images on paper. The use of copy apparatuses is widespread in home as well as offices. Therefore, copy apparatuses providing more advanced printing quality have been developed. However, this also has the effect of enabling misuse of the copy apparatuses in order to counterfeit money.
A conventional method for preventing counterfeit notes is that copy apparatuses store patterns of the money, and do not print an image if the image corresponds to one of the patterns of money. However, such copy apparatuses cannot prevent copying if enlarged size of money is copied to be reduced or reduced size of money is copied to be enlarged. A solution for this problem is required, as the circulation of counterfeit notes is a social issue in any countries.
The present general inventive concept provides a copy apparatus which compares a ratio of patterns in an image with a ratio of pre-stored copy prevention patterns and prevents a printing operation if the ratios are identical so that copying of a transformed size of money is prevented, and a copy prevention method thereof.
Additional aspects and utilities of the present general inventive concept will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the general inventive concept.
The foregoing and/or other aspects and utilities of the present general inventive concept may be achieved by providing a copy apparatus including a scan unit to scan an image, a pattern detection unit to detect patterns corresponding to pre-stored copy prevention patterns from among patterns in the scanned image, and a control unit to prevent the image from being printed if a ratio of the detected patterns is identical to a ratio of the copy prevention patterns.
The pattern detection unit includes a binarization unit to binarize the scanned image, and a detection unit to detect an image section including the patterns presumed to be the copy prevention patterns from among the binarized image.
The control unit calculates the ratio of the detected patterns using distances between the detected patterns, and determines if the calculated ratio is identical to the ratio of the copy prevention pattern.
The pattern detection unit detects patterns using the shape of the patterns in the image if a brightness reverse copy signal is input.
The ratio is a location ratio between the patterns, which is at least one of a horizontal distance ratio, a vertical distance ratio, a diagonal distance ratio, an entire distance ratio, and an angle ratio between the patterns.
The foregoing and/or other aspects and utilities of the present general inventive concept may also be achieved by providing a copy prevention method, the method including scanning an image, detecting patterns corresponding to pre-stored copy prevention patterns from among patterns in the scanned image, and preventing the image from being printed if a ratio of the detected patterns is identical to a ratio of the copy prevention patterns.
Preventing the image from being printed includes binarizing the scanned image, and detecting an image section including the patterns presumed to be the copy prevention patterns from among the binarized image.
In preventing the image from being printed, the ratio of the detected patterns is calculated using distances between the detected patterns, and it is determined if the calculated ratio is identical to the ratio of the copy prevention pattern.
In preventing the image from being printed, patterns are detected using the shape of the patterns in the image if a brightness reverse copy signal is input.
The ratio is a location ratio between the patterns, which is at least one of a horizontal distance ratio, a vertical distance ratio, a diagonal distance ratio, an entire distance ratio, and an angle ratio between the patterns.
The foregoing and/or other aspects and utilities of the present general inventive concept may also be achieved by providing a copy apparatus including a scan unit which scans an image, and a pattern detection unit to detect patterns corresponding to a ratio of pre-stored copy prevention patterns from among patterns in the scanned image.
The copy apparatus further includes a control unit to prevent the image from being printed if the pattern detection unit detects the patterns corresponding to the ratio of pre-stored copy prevention patterns.
The foregoing and/or other aspects and utilities of the present general inventive concept may also be achieved by providing a copy apparatus comprising a scan unit which scans an image, and a control unit to prevent the image from being printed if patterns corresponding to a ratio of pre-stored copy prevention patterns are included in the scanned image.
The control unit detects the patterns corresponding to the ratio of the copy prevention patterns using the shape of the patterns in the image if a brightness reverse copy signal is input, so that the image is not printed.
The foregoing and/or other aspects and utilities of the present general inventive concept may be achieved by providing a copy apparatus including a pattern detection unit to detect patterns corresponding to pre-stored copy prevention patterns from among patterns of a scanned image, and a control unit to prevent the image from being printed if a ratio of the detected patterns is identical to a ratio of the copy prevention patterns.
The copy apparatus may further include a scan unit to scan an image to generate the scanned image.
The scan unit may be connected to the pattern detection unit through a wire network or a wireless network.
The copy apparatus may further include a scan unit to scan a first image and reduces or enlarges the first image to generate a second image as the scanned image.
The copy apparatus may further include a print unit to print the scanned image, and the control unit may not transmit the scanned image to the print unit to prevent the scanned image from being printed.
The copy apparatus may further include a storage unit to store the scanned image, and the control unit may control the storage unit not to store the scanned image.
The copy apparatus may further include an external device connected to the control unit to exchange or receive data with or from the control unit, and the control unit may not transmit the scanned image to the external device.
The patterns may include a first group of patterns having a first characteristic, and a second group of patterns having a second characteristic, the pre-stored copy prevention patterns may include a third group of patterns having a third characteristic, and a fourth group of patterns having a fourth characteristic, the ratio of the patterns may be a ratio of the first characteristic and the second characteristic, and the ratio of the copy prevention patterns may be a ratio of the third characteristic and the fourth characteristic.
The patterns may include a first group of patterns spaced-apart from each other by a first distance, and a second group of patterns spaced-apart from each other by a second distance, the pre-stored copy prevention patterns may include a third group of patterns spaced-apart from each other by a third distance, and a fourth group of patterns spaced-apart from each other by a fourth distance; the ratio of the patterns may include a ratio of the first distance and the second distance, and the ratio of the copy prevention patterns may include a ratio of the third distance and the fourth distance.
The first distance, the second distance, the third distance, and the fourth distance may be disposed in a same direction.
The patterns may include a combination of one or more of a picture pattern, a figure pattern, a numerical digit pattern, a letter patterns, and a watermark pattern.
These and/or other aspects and utilities of the present general inventive concept will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, of which:
Reference will now be made in detail to the embodiments of the present general inventive concept, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present general inventive concept by referring to the figures.
The scan unit 110 scans one of different types of money to generate a money image as a scanned image. The scan unit 110 is connected to the pattern detection unit 120 through a communication line 110a. When the scan unit 110 is disposed in the copy apparatus 100, the communication line 110a may be a signal line or data line. When the scan unit 110 is disposed in an external apparatus, the scan unit 110 can be connected to the pattern detection unit 120 through a wire network, a wireless network, etc., so that the scan unit 110 transmits the scanned image to the pattern detection unit 120. An Internet connection can be used as the communication line 110a.
The pattern detection unit 120 receives the scanned image from the scan unit 110 and detects patterns in the scanned image corresponding to reference patterns, for example, pre-stored copy prevention patterns. The copy prevention patterns are patterns to prevent money from being printed, and may include picture patterns, figure patterns, numerical digit patterns, letter patterns, etc. The present general inventive concept is not limited thereto. When watermarks are disposed in the scanned image, the watermarks can be used as the patterns. The patterns may be one or more combinations of the picture pattern, the figure pattern, the numerical digit pattern, the letter patterns, the watermark pattern, and so on.
If the patterns are detected by the pattern detection unit 120, the control unit 130 compares at least one ratio of the detected patterns with at least one ratio of the pre-stored copy prevention patterns, which may be a location ratio of patterns included in genuine currency (money). The location ratio may include a ratio of distances, angles, or characteristics between the patterns or between each pattern and a reference pattern or a reference location.
If the location ratio of the detected patterns is identical to that of the pre-stored copy prevention patterns, the control unit 130 recognizes that the image is money, and so the image is not printed. Accordingly, even when the size of the money is transformed, printing is prevented.
The scan unit 110 scans images.
The pattern detection unit 120 comprises a binarization unit 121 and a detection unit 123. The binarization unit 121 binarizes pixels of the scanned image. More specifically, the binarization unit 121 identifies values of the pixels which constitute the image, and binarizes the pixel values based on a threshold value.
The detection unit 123 compares the binarized pixel values, detects relationships between adjacent pixels, and detects patterns by analyzing edges of the pixels according to the detected relationships. If it is presumed that the detected patterns are similar to the copy prevention patterns stored in the storage unit 140, an image section including the detected patterns is detected. For example, when the copy prevention patterns stored in the storage unit 140 include a pattern with a plurality of circles, if patterns detected from an image include a plurality of circles, the detected patterns are treated as the copy prevention patterns, and an image section is detected.
If a brightness reverse copy signal is input through an input unit 160, the detection unit 123 detects the relationships between the binarized pixels and detects shapes of the patterns. Accordingly, even when a brightness-reversed image is printed, the patterns corresponding to the copy prevention patterns can be detected using the same method as the method in which patterns of a brightness-not-reversed image are detected.
The storage unit 140 stores the copy prevention patterns and a location ratio of the copy prevention patterns, which comprises a horizontal ratio, a vertical ratio, an entire ratio, and a diagonal ratio, and an angle ratio between the copy prevention patterns or between at least one of the copy prevention patterns and a reference position.
The print unit 150 performs the printing operation.
If the pattern detection unit 120 detects patterns, the control unit 130 identifies the location of the patterns, and calculates a location ratio of the patterns. That is, the control unit 130 calculates a horizontal ratio, a vertical ratio, an entire ratio, and a diagonal ratio, and an angle ratio using distances between the patterns. Subsequently, the control unit 130 compares the location ratio of the patterns in the image with the location ratio of the stored copy prevention patterns. If the location ratio of the patterns in the image is identical to the location ratio of the stored copy prevention patterns, the control unit 130 prevents the print unit 150 from performing the printing operation. As a result, even though an image is an enlarged or reduced copy of money, the image is not printed due to the location ratio of the patterns in the image.
The control unit 130 operates the print unit 150 to print an image if the pattern detection unit 120 does not detect patterns corresponding to the copy prevention patterns or if the location ratio of the patterns in the image is not identical to that of the copy prevention patterns.
It is possible that the control unit 130 is connected to a second storage unit to store data generated from the pattern detection unit 120 or the control unit 130. In this case, the control unit can determine that the scanned image is not stored in the second storage unit when the scanned image is a money image. The storage unit 140 may be used as the second storage unit. When the control unit 130 is connected to an external device through a communication line, the control unit 130 prevents the scanned image from being transmitted to the external device.
The copy prevention patterns 310 illustrated in
The horizontal distances between the patterns are indicated as a and c, the vertical distances between the patterns as b and d, the diagonal distances between the patterns as a′, b′, c′, and d′, and the angles between the patterns as θa, θb, θc, and θd. Accordingly, the location ratios of the copy prevention patterns 310 include a horizontal ratio of a:c, a vertical ratio of b:d, an entire distance ratio of a:b:c:d, a diagonal ratio of a′:b′:c′:d′, and an angle ratio of θa:θb:θc:θd.
More specifically, in the first image section of
If the location ratios of the patterns 1 to 5 in the first image section 320 are calculated, the copy apparatus 100 determines if the location ratios of the patterns 1, 2, 3, 4, and 5 in the first image section 320 are identical to the location ratios of the copy prevention patterns 310 in
For example, if it is assumed that a, b, c, and d in the copy prevention patterns 310 of
The copy apparatus 100 calculates distances i, j, k, and l, diagonal distances i′, j′, k′ and l′, and angles θi, θj, θk, and θl between patterns 1, 2, 3, 4, and 5 in the second image section 330, and also calculates location ratios of the patterns 1, 2, 3, 4, and 5 using them, that is, i:j:k:l, a diagonal ratio of i′:j′:k′:l′, and an angle ratio of θi:θj:θk:θl.
If the location ratios of the patterns 1, 2, 3, 4, and 5 in the second image section 330 are calculated, the copy apparatus 100 determines if the location ratios of the patterns 1, 2, 3, 4, and 5 in the second image section 330 are identical to the location ratios of the copy prevention patterns 310 in
The copy apparatus 100 calculates distances m, n, o, and p, diagonal distances m′, n′, o′ and p′, and angles θm, θn, θo, and θp between patterns 1, 2, 3, 4, and 5 in the third image section 340.
In this embodiment, the copy apparatus 100 may determine whether to print the image using at least one of a horizontal distance ratio or a vertical distance ratio between the patterns. For example, if a vertical distance ratio of b:d or a horizontal distance ratio of a:c in the copy prevention patterns 310 of
For example, a vertical distance ratio in the third image section 340 is 6:10, that is, 3:5, and a horizontal distance ratio in the third image section 340 is 4:4, that is, 1:1, the vertical distance ratio in the third image section 340 is identical to that of the copy prevention patterns 310 of
The copy apparatus 100 calculates distances q, r, s, and t, diagonal distances q′, r′, s′ and t′, and angles θq, θr, θs, and θt between patterns 1, 2, 3, 4, and 5 in the fourth image section 350.
The copy apparatus 100 may determine whether to print the image using at least one of a horizontal distance ratio or a vertical distance ratio between the patterns. For example, if a vertical distance ratio of b:d or a horizontal distance ratio of a:c in the copy prevention patterns 310 of
For example, a vertical distance ratio in the fourth image section 350 is 3:5, and a horizontal distance ratio in the fourth image section 350 is 8:8, that is, 1:1, the vertical distance ratio in the fourth image section 350 is identical to that of the copy prevention patterns 310 of
The copy apparatus 100 detects patterns of the scanned image corresponding to copy prevention patterns in operation S430. The copy prevention patterns are patterns to prevent the money image from being printed, and may be picture patterns, figure patterns, or letter patterns, etc.
Next, if the location ratio of the detected patterns is identical to that of the pre-stored copy prevention patterns in operation S440, the copy apparatus 100 does not print the scanned image in operation S450. In addition, if the location ratio of the detected patterns is not identical to that of the pre-stored copy prevention patterns in operation S440, the copy apparatus 100 prints the scanned image in operation S460. As a result, if picture patterns, figure patterns, or letter patterns in an image are detected, printing operations can be prevented by determining that the scanned image is the money image. In addition, although the image is reduced or enlarged, copying is prevented if the patterns in the image have a location ratio identical to copy prevention patterns of genuine money.
Subsequently, the copy apparatus 100 binarizes the scanned image in operation S520.
The copy apparatus 100 determines whether there are patterns in the binarized image which are presumed to be copy prevention patterns in operation S530. In greater detail, the copy apparatus 100 detects patterns by identifying relationships between the pixels of the binarized image. Then, it is presumed whether the detected patterns are identical to pre-stored copy prevention patterns.
Subsequently, the copy apparatus 100 detects an image section including the patterns in operation S540. The copy apparatus 100 calculates the location ratio of the patterns in the image section in operation S550. More specifically, the copy apparatus 100 calculates the horizontal distance ratio, vertical distance ratio, entire distance ratio, diagonal ratio, and angle ratio using distances between the patterns.
The copy apparatus 100 determines if the calculated location ratio of the patterns is identical to that of the pre-stored copy prevention patterns in operation S560. If the location ratio of the patterns is identical to that of the pre-stored copy prevention patterns, printing operation is prevented in operation S570. In this case, the image is recognized as money so the image cannot be printed.
If there is no patterns in the scanned image which are presumed as copy prevention patterns in operation S530, or if the location ratio of the patterns in the image is not identical to that of the pre-stored copy prevention patterns in operation S560, the image is printed in operation S580. Therefore, although the size of money to be copied is reduced or enlarged, copying is prevented by comparing the location ratio of the detected patterns with that of copy prevention patterns.
As described above, the present general inventive concept provides that the location ratio of patterns in an image is detected and compared with the location ratio of copy prevention patterns which is a reference so that copying is prevented by identifying if the image is money. Consequently, although money which has been enlarged in size is copied at a smaller size or money which has been reduced in size is copied at a larger size, printing is not performed if the location ratio of the patterns in the image is identical to that of copy prevention patterns of genuine currency or money. Therefore, fake or counterfeit money is prevented by preventing a printing operation of printing a scanned image when the scanned image is a money image.
The present general inventive concept can also be embodied as computer-readable codes on a computer-readable medium. The computer-readable medium can include a computer-readable recording medium and a computer-readable transmission medium. The computer-readable recording medium is any data storage device that can store data which can be thereafter read by a computer system. Examples of the computer-readable recording medium include read-only memory (ROM), random-access memory (RAM), CD-ROMs, magnetic tapes, floppy disks, and optical data storage devices. The computer-readable recording medium can also be distributed over network coupled computer systems so that the computer-readable code is stored and executed in a distributed fashion. The computer-readable transmission medium can transmit carrier waves or signals (e.g., wired or wireless data transmission through the Internet). Also, functional programs, codes, and code segments to accomplish the present general inventive concept can be easily construed by programmers skilled in the art to which the present general inventive concept pertains.
Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.
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