CN110415264B - Motion detection circuit and method - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000009471 action Effects 0.000 claims abstract description 22
- 238000010586 diagram Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 5
- 238000003708 edge detection Methods 0.000 description 3
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- 238000006073 displacement reaction Methods 0.000 description 1
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
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Abstract
The invention provides a motion detection circuit and a motion detection method. The motion detection circuit comprises a detection unit for obtaining a current picture and judging whether a specific pixel exists in the current picture. The motion detection circuit further comprises a signature generator and a comparator. The signature generator is used for executing an updating program for each specific pixel. The update procedure includes: adding the coordinate information of the specific pixel to the corresponding signature value, and updating at least one bit in the corresponding signature value. The comparator is used for comparing the signature value of the current picture with the signature value of the previous picture to judge whether the current picture is an action picture or not.
Description
Technical Field
The invention relates to a motion detection method and a circuit for calculating signature values to judge motion pictures.
Background
In the field of image processing, it is desirable in some situations to determine whether there is an action picture in a piece of video. In order to detect the motion picture, a difference between the front and rear images may be calculated, a histogram (histogram) may be calculated, and the like, however, the complexity of these may be high. Therefore, how to propose a low-complexity algorithm to judge the motion picture is an issue of interest to those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a motion detection circuit, which comprises a detection unit for acquiring a current picture and judging whether a specific pixel exists in the current picture, wherein the specific pixel refers to a pixel at an edge or a pixel with a specific hue, saturation, brightness and texture. The motion detection circuit further comprises a signature generator and a comparator. The signature generator is used for executing an updating program for each specific pixel. The update procedure includes: adding the coordinate information of the specific pixel to the corresponding signature value, and updating at least one bit in the corresponding signature value. The comparator is used for comparing the signature value of the current picture with the signature value of the previous picture to judge whether the current picture is an action picture or not; if the signature values of the current picture and the previous picture are different, the current picture is an action picture.
In some embodiments, the current frame includes a plurality of blocks, each block having a corresponding signature value. When initializing the signature value of the current picture and the signature value of the previous picture, the same default value is adopted for the signature values corresponding to the blocks with the same positions.
In some embodiments, in the update procedure, the signature generator is configured to shift the corresponding signature value to the left or right by a plurality of bits, and add the X-coordinate and the Y-coordinate of the specific pixel with respect to the block to which the specific pixel belongs to the corresponding signature value.
In some embodiments, in the updating procedure, the step of updating the bits of the corresponding signature values by the signature generator includes: s bits are obtained from the signature value, wherein S is a positive integer greater than 1; performing a logical operation on the S bits; and updating at least one bit in the signature value to be the result of the logical operation.
In some embodiments, the number of bits of the signature value updated in the update process is greater than 1, and the signature generator obtains different S bits when updating different bits in the signature value.
In another aspect, an embodiment of the present invention provides a motion detection method, which is suitable for a motion detection circuit, and the motion detection method includes: obtaining a current picture and judging whether a specific pixel exists in the current picture, wherein the specific pixel refers to a pixel at an edge or a pixel with a specific hue, saturation, brightness and texture: an update procedure is performed for each particular pixel. The update procedure includes: adding the coordinate information of the specific pixel to the corresponding signature value; and updating at least one bit in the corresponding signature value. The above action detection method further comprises; comparing the signature value of the current picture with the signature value of the previous picture to judge whether the current picture is an action picture or not; if the signature values of the current picture and the previous picture are different, the current picture is an action picture.
In some embodiments, the current frame includes a plurality of blocks, each block having a corresponding signature value. The action detection method further comprises the following steps: when initializing the signature value of the current picture and the signature value of the previous picture, the same default value is adopted for the signature values corresponding to the blocks with the same positions.
In some embodiments, the motion detection method further comprises: in the updating procedure, the corresponding signature value is shifted to the left or right by a plurality of bits, and the X coordinate and Y coordinate of the specific pixel relative to the block to which the specific pixel belongs are added to the corresponding signature value.
In some embodiments, the step of updating the digits of the signature value in the update process comprises: s bits are obtained from the signature value, wherein S is a positive integer greater than 1; performing a logical operation on the S bits; and updating bits in the signature value as a result of the logical operation.
In some embodiments, the number of bits updated in the update procedure is greater than 1. The action detection method further comprises the following steps: in updating different bits in the signature value, different S bits are obtained.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1A is a schematic diagram illustrating a display device according to one embodiment;
FIG. 1B is a block diagram illustrating an operation detection circuit according to one embodiment;
FIG. 2 is a diagram illustrating calculating signature values according to one embodiment;
FIG. 3 is a diagram illustrating the addition of coordinate information to signature values according to one embodiment;
FIG. 4 is a diagram illustrating bits in updating signature values according to one embodiment;
FIG. 5 is a diagram showing the comparison of signature values in two frames according to one embodiment; and
FIG. 6 is a flow chart illustrating a method of motion detection according to one embodiment.
Detailed Description
Fig. 1A is a schematic diagram illustrating a display device according to an embodiment. In the embodiment of fig. 1A, the display device 100 includes a timing controller 110, a source driver 120, a gate driver 130 and a display panel 140. The timing controller 110 includes an action detection circuit 111 for performing an action detection method described below. However, the motion detection circuit 111 and the method can also be applied to other electronic devices, such as smart phones, tablet computers, personal computers, notebook computers, industrial computers, display screens, touch screens, etc.
FIG. 1B is a block diagram illustrating an operation detection circuit according to an embodiment. Referring to fig. 1B, the motion detection circuit 111 includes a detection unit 150, a signature generator 160, a comparator 170 and a register 180. The signature generator 160 includes a register 161 and an operation unit 162. The operation of the operation detection circuit 111 will be described below with reference to fig. 1B and 2.
FIG. 2 is a diagram illustrating calculating signature values according to one embodiment. Referring to fig. 2, the detecting unit 150 obtains the current frame 200 and determines whether there are specific pixels in the current frame. In this embodiment, the detecting unit 150 may employ any edge detection algorithm, and the specific pixel mentioned above refers to a pixel at an edge. The edge detection algorithm uses a filter, and performs convolution (convolution) operation on the current frame 200 according to the filter, where the filtered result can be compared with a threshold value, and if the filtered result is greater than the threshold value, the filtered result is determined to be a specific pixel. The filter may be any suitable high-pass filter, for example, a sobel (sobel) filter, and the present invention is not limited thereto. Those of ordinary skill in the art will appreciate that any edge detection algorithm, such as the Canni edge detector (canny edge detector), may be used, and the invention is not limited in its context. In other embodiments, the detecting unit 150 can also determine whether each pixel in the current frame 200 has a specific brightness, hue (hue), saturation, or whether each pixel in the current frame 200 has a specific texture (e.g. line, plane, arbitrary geometry, etc.) to obtain a specific pixel. In other words, the specific pixel may be a pixel having a specific hue, saturation, brightness, and texture, and the present invention is not limited thereto. Fig. 2 shows specific pixels P1 and P2 as examples to illustrate the subsequent algorithm.
In some embodiments, the current frame 200 may be divided into m×n blocks, where M and N are positive integers. In some embodiments, the positive integers M and N are 16, but may be 8, 32, 64, or other values in other embodiments, and the invention is not limited thereto. In some embodiments, the width of the current frame 200 may not be divided by the positive integer M, so the width of the first M-1 blocks may be set to be the same, and the width of the Mth block may be larger or smaller. In some embodiments, the width and height of each block may be designed arbitrarily, or may be different from each other, and the shape of each block may be other polygons or circles, and is not limited to a rectangle.
For each block, a signature value (signature) may be set, and the signature values are stored in the register 161, and the specific pixels are used to update the signature values, if the signature value in the same block is changed, it indicates that the brightness, color, edge, or texture in the picture is changed, that is, an action occurs, and how to calculate the signature values will be described below. First, the operation unit 162 initializes the signature value, and in some embodiments, the signature value of each block in the current frame 200 may be initialized to a different value and may be randomly generated. In other embodiments, the signature values of several blocks in the current frame 200 may be initialized to the same value, which is not a limitation of the present invention.
For each particular pixel, signature generator 160 performs an update procedure. Here, specific pixels P1 and P2 are taken as an example, and the specific pixels P1 and P2 belong to the block 210. When the updating process is performed on the specific pixels P1 and P2, the signature generator 160 updates the signature value corresponding to the block 210. In other words, the above-mentioned updating process is repeated twice for the signature value corresponding to the block 210. Specifically, the update procedure includes at least two steps: first, adding coordinate information of a specific pixel relative to a belonging block to signature values corresponding to the belonging block; second, at least one bit in the signature value is updated.
In the first step described above, the coordinate information of the specific pixel with respect to the block includes, for example, an X coordinate and a Y coordinate, which have the upper left corner in the block as the origin. For example, with the coordinate O as the origin, the coordinate information of the specific pixel P1 is represented as (3, 4), for example, and the coordinate information of the specific pixel P2 is represented as (6, 8), for example. In some embodiments, the values of the X and Y coordinates do not exceed 255, so the X and Y coordinates may be represented in 8 bits each, which are hereinafter denoted as X for the sake of general representation local And y is local . FIG. 3 is a schematic diagram showing the addition of coordinate information to the signature value, referring to FIG. 3, one embodiment of the above-mentioned "adding coordinate information to signature value" is to shift the signature value by a plurality of bits to the left or right, 16 bits to the right in the example of FIG. 3, and then to shift the coordinate x local And the coordinate y local Added to the signature value, this operation can be expressed as the following equation (1).
LFSR i ＝(y local ＜＜8+x local )＜＜16+LFSR i ＞＞16…(1)
Wherein LFSR is i Indicating the signature value corresponding to the i-th block,<<indicating a displacement to the left,>>representing a rightward shift, + represents an OR logical operation. In the above embodiment, the coordinates are added to the most significant bits (most significant bit, MSB), but in some embodiments, the signature value may be shifted to the left by a plurality of bits before the coordinates x local And y is local Added to the least significant bit (least significant bit, LSB). Alternatively, when the width and height of the block are greater or lesser, the coordinate x local 、y local The number of bits required may be greater or lesser, and correspondingly the signature value may be shifted by fewer or greater bits. In some embodiments, the signature value may be replaced directly with the coordinate x without shifting the signature value local 、y local . Nor is the invention limited to the coordinate x local 、y local Locations in new signature values, e.g. coordinates x local 、y local The bits of (a) may also be present in the new signature value in a decentralized manner. In some embodiments, the step of adding the coordinate information to the signature value may be to add the signature value to the coordinate x local 、y local Any logical operations, such as addition, subtraction, multiplication, division, logical AND, logical OR, etc., are performed, provided that the coordinate x is used local 、y local To change the bits in the signature value, the invention is not limited in this regard.
Next, a second step of the update procedure is described: at least one bit in the signature value is updated. Referring to FIG. 4, in some embodiments, S bits may be derived from the signature value, where S is a positive integer, such as 12, 13, 14, or other values. Next, a logical operation is performed on the S bits, and one bit in the signature value is updated as a result of the logical operation, which may be performed U times to update U bits in the signature value, where U is a positive integer, such as 8, 9, 10, or other values. In the following embodiments, the logical operation is exclusive OR operation (XOR operation), but in other embodiments, the logical operation may be an AND OR operation, which is not limited to this. In some embodiments, when U is greater than 1, a different S bits are taken to update a different bit each time the bit is updated. For example, FIG. 4 shows two updates, the top half of FIG. 4 is the acquisition bit b 30 、b 28 …b 1 Exclusive OR operation is performed on 13 bits, and bit b 31 Updated as the result of the exclusive-or operation. The lower half of FIG. 4 is the acquisition bit b 31 、b 29 …b 0 Exclusive OR operation is performed on 13 bits, and bit b 16 Updated as the result of the exclusive-or operation. Alternatively, this step may be expressed as the following equation (2).
Here the number of the elements to be processed is,is exclusive or fortuneCalculating b s,1 ...b s,S Representing the selected bit, e.g. b in the upper half of FIG. 4 s, 1 ...b s,S Equal to b 30 、b 28 …b 1 B in the lower half of fig. 4 s,1 ...b s,S Equal to b 31 、b 29 …b 0 。b u Representing the bits to be updated, equation (2) may be executed U times, with bit b selected each time it is executed s May be different, e.g. b in the upper half of FIG. 4 u Equal to b 31 In the lower half of fig. 4 b u Equal to b 16 . Referring to fig. 3 and 4, in some embodiments, the LFSR is due to the signature value i Will shift 16 bits to the right, so in equation (2) above, bit b u Will only be bit b 31 ～b 16 Is one of the following. In some embodiments, each update in FIG. 4 is a parallel operation, i.e., the selected bit is a bit in the old signature value, and not a bit in the new signature value. For example, bit b selected in the lower half of FIG. 4 31 Is the bit before the top half update of fig. 4 has not been performed. However, in some embodiments, the updates in FIG. 4 may also be performed sequentially, i.e., bit b selected in the lower half of FIG. 4 31 The bits after the upper half of the update of fig. 4 is performed are not limited in this regard.
Referring to fig. 1B, after the above-mentioned updating process is performed for each specific pixel in the current frame 200, the signature values 181 of the current frame 200 are sent to the register 180 and the comparator 170. In addition, the register 180 stores the signature value of the previous frame, and the signature value 182 of the previous frame is also sent to the comparator 170. The comparator 170 determines whether the signature value 181 of the current frame is identical to the signature value 182 of the previous frame, and if the two are not identical, the current frame is an action frame. It should be noted that, since each block has a corresponding signature value, the comparator 170 can compare two signature values corresponding to the same block to determine whether the block has an action. For example, referring to fig. 5, on the time axis, a front frame 500 is located before the current frame 200, and the front frame has a block 510, wherein the block 510 is depicted in the drawingThe relative position in the plane 500 is the same as the relative position of the block 210 in the frame 200. It should be noted that, when initializing the signature value in the current frame 200 and the signature value of the previous frame 500, the same default value is adopted for the two signature values corresponding to the same block. In addition, when equations (1) and (2) are performed on block 210 and block 510, all variables are identical, e.g., shifted by the same number of bits, by the same positive integer U, S, by the same bit b u 、b s, 1 ...b s,S And so on, the two signature values corresponding to block 210 and block 510 can be compared with each other.
If the signature value corresponding to block 210 is different from the signature value corresponding to block 510, indicating that an action has occurred in blocks 210, 510, additional processing may be performed after the determination is made, e.g., overdrive (over drive) processing may be performed by timing controller 110. However, the present invention is not limited to those operations or programs that may be subsequently executed.
Fig. 6 is a flowchart illustrating a motion detection method according to an embodiment, referring to fig. 6, in step 601, a current frame is obtained and whether there are specific pixels in the current frame is determined. In step 602, it is determined whether there are any more specific pixels in the current frame. If yes, in step 602, in step 603, the coordinate information of the specific pixel is added to the corresponding signature value. In step 604, at least one bit in the corresponding signature value is updated. Steps 603 and 604 are also referred to as updating procedures. Steps 602 to 604 are repeated until all the specific pixels are processed, and if the result of step 602 is no, the signature value of the current frame is compared with the signature value of a previous frame to determine whether the current frame is an action frame (step 605). However, the steps in fig. 6 are described in detail above, and will not be described again here. It should be noted that the steps in fig. 6 may be implemented as a plurality of program codes or circuits, and the present invention is not limited thereto. In addition, the method of fig. 6 may be used with the above embodiment, or may be used alone. In other words, other steps may be added between the steps of fig. 6.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, but rather, it should be apparent to one skilled in the art that various changes and modifications can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Symbol description
100: display apparatus
110: time sequence controller
111: motion detection circuit
120: source driver
130: gate driver
140: display panel
150: detection unit
160: signature generator
161. 180: buffer memory
162: arithmetic unit
170: comparator with a comparator circuit
181. 182: signature value
200: current picture
210: block block
M, N: positive integer
P1, P2: pixel arrangement
O: coordinates of
b 0 ～b 31 : bit position
x local 、y local : coordinates of
500: front picture
510: block block
601 to 605: step (a)
Claims (10)
1. A motion detection circuit, comprising a detection unit for obtaining a current frame and determining whether there is a specific pixel in the current frame, wherein the specific pixel is a pixel at an edge or a pixel having a specific hue, saturation, brightness, and texture, the motion detection circuit comprising:
a signature generator for executing an update procedure for each of the specific pixels, the update procedure comprising:
adding the coordinate information of the specific pixel to the corresponding signature value; and
updating at least one bit in the corresponding signature value; and
the comparator is used for comparing the signature value of the current picture with the signature value of the previous picture to judge whether the current picture is an action picture or not; and if the signature values of the current picture and the previous picture are different, the current picture is an action picture.
2. The motion detection circuit of claim 1, wherein the current frame comprises a plurality of blocks, each of the plurality of blocks having a corresponding signature value, the signature values corresponding to the blocks having the same location being the same default value when initializing the signature values of the current frame and the signature values of the previous frame.
3. The motion detection circuit of claim 2, wherein in the update procedure, the signature generator is configured to shift the corresponding signature value to the left or right by a plurality of bits and add the X-coordinate and Y-coordinate of the particular pixel with respect to the block to the corresponding signature value.
4. The motion detection circuit of claim 3, wherein in the updating procedure, the step of the signature generator updating the at least one bit in the corresponding signature value comprises:
s bits are obtained from the signature value, wherein S is a positive integer greater than 1;
performing a logical operation on the S bits; and
updating the at least one bit in the signature value to be the result of the logical operation.
5. The motion detection circuit of claim 4 wherein in the update procedure the number of the at least one bit updated in the signature value is greater than 1, the signature generator obtaining different S bits when updating different bits in the signature value.
6. A motion detection method, characterized by being applied to a motion detection circuit, comprising:
obtaining a current picture and judging whether a specific pixel exists in the current picture, wherein the specific pixel refers to a pixel at an edge or a pixel with a specific hue, saturation, brightness and texture;
performing an update procedure for each of the specific pixels, the update procedure comprising:
adding the coordinate information of the specific pixel to the corresponding signature value; and
updating at least one bit in the corresponding signature value; and
comparing the signature value of the current picture with the signature value of the previous picture to judge whether the current picture is an action picture or not; and if the signature values of the current picture and the previous picture are different, the current picture is an action picture.
7. The method of claim 6, wherein the current picture comprises a plurality of blocks, each block of the plurality of blocks having a corresponding signature value, the method further comprising:
when initializing the signature value of the current picture and the signature value of the previous picture, the same default value is adopted for the signature values corresponding to the blocks with the same positions.
8. The motion detection method of claim 7, further comprising:
in the updating procedure, the corresponding signature value is shifted leftwards or rightwards by a plurality of bits, and the X coordinate and Y coordinate of the specific pixel relative to the block to which the specific pixel belongs are added into the corresponding signature value.
9. The method of claim 8, wherein the step of updating the at least one bit in the corresponding signature value in the update program comprises:
s bits are obtained from the signature value, wherein S is a positive integer greater than 1;
performing a logical operation on the S bits; and
updating the at least one bit in the signature value to be the result of the logical operation.
10. The action detection method according to claim 9, wherein in the update program, the number of the at least one bit that is updated is greater than 1, the action detection method further comprising:
in updating different bits in the signature value, different S bits are obtained.
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