This application claims the benefit of People's Republic of China application Serial No. 202011591881.0, filed on Dec. 29, 2020, the subject matter of which is incorporated herein by reference.
The invention relates in general to a processing method and a processing device using the same, and more particularly to an image processing method and an image processing device using the same.
Due to some factors, the images captured by a conventional camera may be deformed. Therefore, it has become a prominent task for the industries of the technology field to develop a new image processing method and an image processing device using the same to resolve the problems of image deformation encounter in the prior art.
The invention is directed to an image processing method and an image processing device using the same capable of resolving the problems disclosed above.
According to one embodiment of the present invention, an image processing method is provided. The image processing method includes the following steps: (a), a to-be-processed image is corrected as a first correction image according to a first mapping relationship along a correction direction; (b) the first correction image by an angle is rotated; and (c) the rotated first correction image is corrected as a second correction image according to a second mapping relationship along the same correction direction. In embodiment, given that the to-be-processed image is deformed along two different directions, the to-be-processed image is corrected along the same correction direction, such that correction complexity could be reduced.
According to another embodiment of the present invention, an image processing device is provided. The image processing device includes a first correction unit and a second correction unit. The first correction unit is configured to: correct a to-be-processed image as a first correction image according to a first mapping relationship along a correction direction and rotate the first correction image by an angle. The second correction unit configured to: correct the rotated first correction image as a second correction image according to a second mapping relationship along the same correction direction.
The above and other aspects of the invention will become better understood with regard to the following detailed description of the preferred but non ting embodiment(s). The following description is made with reference to the accompanying drawings.
Detailed descriptions of the invention are disclosed below with embodiments accompanying drawings. However, the descriptions are for exemplary purpose only, not for limiting the scope of protection of the present invention.
Refer to
The image processing device 100 includes a first correction unit 110, a second correction unit 120 and a memory 130. The first correction unit 110 is configured to: correct the to-be-processed image IM1 (illustrated in
In another embodiment, the second correction unit 120 could correct the second correction image IM22 as a third correction image IM3, wherein the direction of the third correction image IM3 with respect to the to-be-processed image IM1 remains the same, that is, the third correction image IM3 is not rotated with respect to the to-be-processed image IM1.
The image processing device 100 could be realized by a camera. The first correction unit 110 and the second correction unit 120 could be realized physical circuits, such as semiconductor chips or semiconductor packages, formed using semiconductor process. Besides, the first correction unit 110 and the second correction unit 120 could be integrated as one element; or the first correction unit 110 and/or the second correction unit 120 could be integrated to a processor or a controller.
As indicated in
The first mapping relationship P1 and/or the second mapping relationship P2 could be offline or established beforehand. The first mapping relationship P1 and/or the second mapping relationship P2 record the mapping relationships between a deformed image and an aligned image. The first correction unit 110 and the second correction unit 120 could resolve or correct the deformation of the to-be-processed image IM1 according to the first mapping relationship P1 and the second mapping relationship P2. The embodiments of the present invention do not specify the first mapping relationship P1 and/or the second mapping relationship P2 and any mapping relationship capable of correcting the deformation of the to-be-processed image IM1 would do. Moreover, the first mapping relationship P1 contains several mesh tables, which provide the correction/mapping relationship between the to-be-processed block and the first correction block. Similarly, the second mapping relationship P2 contains several mesh tables, which provide the correction/mapping relationship between the first correction block and the second correction block.
As indicated in
A number of embodiments of the image processing method are exemplified below.
Refer to
In step S10, the (n1×m1)-th to-be-processed grid Gn1×m1 of the (r1×q1)-th to-be-processed block Tr1×q1 is corrected by the first correction unit 110 according to the first mapping relationship P1.
Before correcting the to-be-processed block Tr1×q1, as indicated in
Furthermore, before correcting the to-be-processed block Tr1×q1, the first correction unit 110 could sequentially write r1×q1 to-be-processed blocks Tr1×q1 to the memory 130. For example, the first correction unit 110 could sequentially write the (r1×q1)-th to-be-processed block Tr1×q1 to the memory 130 according to parameter r1 in an ascending order and parameter q1 in an ascending order. For example, the first correction unit 110 could sequentially write several to-be-processed blocks T1×1, T1×2, . . . , T1×Q of the to-be-processed blocks T1×q1 in the 1st row (r1=1) (according to a parameter q1 in an ascending order) to the memory 130, then write sequentially several to-be-processed blocks T2×1, T2×2, . . . , T2×Q of the to-be-processed blocks T2×q1 in the 2nd row (r1=2) (according to a parameter q1 in an ascending order) to the memory 130. The rest could be obtained by the same analogy until several to-be-processed blocks TR×1, TR×2, . . . , TR×Q in the R-th row (r1=R) are sequentially (according to a parameter q1 in an ascending order) written to the memory 130. In the subsequent process of correcting the to-be-processed block Tr1×q1, the first correction unit 110 could sequentially read the to-be-processed block Tr1×q1 from the memory 130.
In step S20, the first correction image IM21 is rotated by an angle by the first correction unit 110.
Steps S10 and S20 could be performed concurrently, that is, after each to-be-processed block Tr1×q1 is corrected, the corrected image is written to the memory in the form of a rotated image to obtain a rotated first correction image IM21′.
The method is exemplified below with
The first correction unit 110 sequentially corrects the to-be-processed block Tr1×q1. As indicated in
In step S110, the initial value of the parameter r1 is set to 1 by the first correction unit 110.
In step S120, the initial value of the parameter q1 is set to 1 by the first correction unit 110.
In step S130, the data of the to-be-processed block Tr1×q1 is read from the memory 130 and is corrected by the first correction unit 110. After the correction of the to-be-processed block Tr1×q1 is completed, the method proceeds to step S140.
In step S140, whether q1=Q is determined by the first correction unit 110: if the determination result is positive, this indicates that the correction of all to-be-processed blocks Tr1×q1 in the r1-th row is already completed, then the method proceeds to step S160; if the determination result is negative, this indicates that the correction of all to-be-processed blocks Tr1×q1 in the r1-th row is not yet completed, then the method proceeds to step S150.
In step S150, q1=q1+1 is set by the first correction unit 110, then the process returns to step S130, the next to-be-processed block Tr1×q1 in the r1-th row is processed.
In step S160, after the correction of all to-be-processed blocks Tr1×q1 in the R-th row is completed, whether r1=R is determined by the first correction unit 110: if the determination result is positive, this indicates that the correction of the to-be-processed block TR×q1 in the last row (the R-th row) is already completed and the correction of the first correction image IM21 is completed, then the method terminates; if the determination result is negative, this indicates that the correction of the to-be-processed block TR×q1 in the last row (the R-th row) is not yet completed, then the method proceeds to step S170.
In step S170, r1=r1+1 is set by the first correction unit 110, and the method returns to step S120, the to-be-processed block Tr1×q1 in the next row (the r1-th row) is corrected.
Details of the correction process of all to-be-processed grids Gn1×m1 of the (r1×q1)-th to-be-processed block TR×q1 by the first correction unit 110 and the second correction unit 120 are disclosed below with
In step S130A the initial value of the parameter n1 is set to 1 by the first correction unit 110.
In step S130B, the initial value of the parameter m1 is set to 1 by the first correction unit 110.
In step S130C, the (n1×m1)-th to-be-processed grid Gn1×m1 of the (r1×q1)-th to-be-processed block TR×q1 is corrected by the first correction unit 110. The to-be-processed grid Gn1×m1 contains several pixels. The first correction unit 110 corrects the pixels of the to-be-processed grid Gn1×m1 according to the (r1×q1)-th mesh table PT1r1×q1 of the first mapping relationship P1.
As indicated in
In step S130D, whether m1=M is determined by the first correction unit 110: if the determination result is positive, this indicates that the correction of all to-be-processed grids Gn1×m1 in the n1-th row is already completed, then the method proceeds to step S130F; if the determination result is negative, this indicates that the correction of all to-be-processed grids Gn1×m1 in the n1-th row is not yet completed, then the method proceeds to step S130E.
In step S130E, m1=m1+1 is set by the first correction unit 110, and the method returns to step S130C, the next to-be-processed grid Gn1×m1 in the n1-th row is corrected.
In step S130F, after the correction of all to-be-processed grids Gn1×m1 in the n1-th row is completed, whether n1=N is determined by the first correction unit 110: if the determination result is positive, this indicates that the correction of the to-be-processed grid GN×m1 in the last row (the N-th row) is already completed, then the method proceeds to step S140 of
In step S130G, n1=n1+1 is set by the first correction unit 110, then the method returns to step S130B, the to-be-processed grid Gn1×m1 in the next row (the n1-th row) is corrected.
The first correction unit 110 sequentially corrects all to-be-processed grids Gn1×m1 of all to-be-processed blocks Tr1×q1 according to the processes illustrated in
In step S30, the rotated first correction image IM21′ is corrected as a second correction image IM22 by the second correction unit 120 according to the (r1×q1)-th mesh table PT2r1×q1 of the second mapping relationship P2 along the same correction direction. For example, the second correction unit 120 sequentially corrects the first correction block Tq1×(R−r1+1)′ of
In the example of correcting the (q1×(R−r1+1))-th first correction block Tq1×(R−r1+1)′ as indicated in
Besides, the image processing device 100 could output the second correction image IM22 to display the second correction image IM22.
In the present embodiment the rotated first correction image IM21′ is 90° anti-clockwise (the first rotation direction) with respect to the to-be-processed image IM1. Detailed descriptions are disclosed below.
Refer to
The first correction unit 110 could sequentially correct the to-be-processed block Tr1×q1 using the correction method of the first embodiment and sequentially correct all to-be-processed grids Gn1×m1 of the (r1×q1)-th to-be-processed block Tr1×q1 according to the same correction direction of the first embodiment. The difference lies in that several first correction grids G(M−m1+1)×n1′ of
Detailed descriptions are disclosed below.
Refer to
In step S30, the rotated first correction image IM21′ is corrected as a second correction image IM22 by the second correction unit 120 according to the (r1×q1)-th mesh table PT2r1×q1 of the second mapping relationship P2 along the same correction direction. For example, the first correction block T(Q−q1+1)×r1″ is sequentially corrected as the second correction block T(Q−q1+1)×r1″ by the second correction unit 120 according to a parameter (Q−q1+1) in an ascending order and a parameter r1 in an ascending order. Similarly, when correcting the ((Q−q1+1)×r1)-th first correction block T(Q−q1+1)×r1′, the second correction unit 120 sequentially corrects the first correction grid G(M−m1+1)×n1′ as a second correction grid G(M−m1+1)×n1″ according to a parameter (M−m1+1) in an ascending order and a parameter r in an ascending order.
Additionally, the image processing device 100 could output the second correction image IM22 to display the second correction image IM22.
Referring to
For example, the second correction unit 120 sequentially writes the second correction block Tq1×(R−r1+1)″ of
Moreover, the image processing device 100 could output the third correction image IM3 to display the third correction image IM3.
Referring to
For example, the second correction unit 120 sequentially writes the second correction block T(Q−q1+1)×r1″ to the third correction block Tr2×(Q−q2+1)′″ of the third correction image IM3 according to a parameter (Q−q1+1) in an ascending order (the value is represented by q2) and a parameter r in an ascending order (the value is represented by r2). Thus, with respect to the to-be-processed image IM1, the third correction image IM3 is not rotated. Furthermore, in the example of the second correction block T(Q−q1+1)×r1″ of
To summarize, the it mage processing device corrects the to-be-processed image as a first correction image according to the first mapping relationship along the correction direction, then rotates the first correction image by an angle along a first rotation direction, and corrects the rotated first correction image as a second correction image according to the second mapping relationship along the same correction direction. The said first rotation direction could be clockwise or anti-clockwise, and the said angle could be 90°. The said “correction direction” refers to the to-be-processed image and/or the correction order of several blocks of the first correction image. Since the deformation of the to-be-processed in age along two different directions could be corrected along the same “correction direction”, correction complexity could be simplified. Besides, the to-be-processed in age could be divided into a fixed number of to-be-processed blocks. Even when the to-be-processed image has high distortion complexity, the number of to-be-processed blocks processed by the image processing device still remains unchanged, such that correction complexity could be simplified. In another embodiment, the image processing device could rotate the second correction image by an angle along the second rotation direction to obtain a third correction image, wherein the direction of the third correction image remains the same with respect to the to-be-processed image, that is, the third correction image is not rotated.
While the invention has been described by way of example and in terms of the preferred embodiment(s), it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.
Number | Date | Country | Kind |
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202011591881.0 | Dec 2020 | CN | national |
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107749050 | Mar 2018 | CN |
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20220207670 A1 | Jun 2022 | US |