CN101031029A - Method and apparatus for processing video image - Google Patents
Method and apparatus for processing video image Download PDFInfo
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- CN101031029A CN101031029A CN 200710027407 CN200710027407A CN101031029A CN 101031029 A CN101031029 A CN 101031029A CN 200710027407 CN200710027407 CN 200710027407 CN 200710027407 A CN200710027407 A CN 200710027407A CN 101031029 A CN101031029 A CN 101031029A
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Abstract
The method comprises: detecting any pixel in a video image, and comparing its value with values of its neighboring pixels; according to the comparative result, deciding whether it's a still image or it's a motion image; if it's a motion image, then starting edge detection to make detection for said pixel and all its neighboring pixels in order to select a pixel pair with minimal difference by which making an in-field interpolation calculation for the motion video image.
Description
Technical field
The present invention relates to signal processing technology, relate in particular to a kind of method of video image processing and device thereof.
Background technology
In Digital Television, if coding side is a coding, then the image that solves of Video Decoder is to intersect the frame figure (FramePicture) that stack forms by top (Top Field) image and Di Chang (BottomField) image.Standard definition television (hereinafter to be referred as Standard Definition Television) shows top field picture and end field picture in turn.If the original size of display size and image is identical, the scan line of Standard Definition Television (Scan Line) can scan end field picture in the time of field, the end, therefore scanning top field picture can not destroy the time order and function relation between top field picture and the end field picture in the time of the field, top, and image can normally show.If but the original size of display size and image is inequality, needs that then original image is carried out convergent-divergent and handle.The convergent-divergent of image is handled the image that can use field, top and field, the end.Therefore, compare with original image, scaled images can increase or delete or revise the value of some pixel (pixel).These new pixels are that end field picture and top field picture are calculated by interpolation (Interfield Interpolation) or field interpolation (Intrafield Interpolation) between the field.
Interpolation cuts both ways between field interpolation and field, and a kind of solution that the video image of prior art is handled is that interpolation between field interpolation and field is combined, if moving image adopts field interpolation, if rest image adopts interpolation between the field.
Existing motion detection technique is that many field picture are compared, if the difference of correspondence position is excessive, just thinks that image moves, otherwise, think that image is static, as shown in Figure 1.
When selecting the computational methods of difference, can select to judge based on piece, also can select to judge based on pixel, when selecting block-based judgment mode, normally calculate mean-square value.
Through above-mentioned motion detection, if video image moves, then carry out field interpolation, carrying out before the field interpolation, must be through rim detection, it is right to select suitable pixel, in existing technology, because the algorithm difference of motion detection and rim detection is very big, thus handle respectively, specifically as shown in Figure 2.
The shortcoming of the method for video image processing of prior art is as follows:
At first the shortcoming of the motion detection algorithm of Cai Yonging is:
When the judgement adopted based on pixel, because the top is different with the position of field, the end on video screen, so, even the excessive situation of difference also may appear in rest image.Such as, on video screen, the dark red horizontal line of the capable demonstration of n, the light red horizontal line of the capable demonstration of n+1 though image is static, is judged from peony and pale red, draws the conclusion of image motion possibly.Judge if make accurately, then need image to carry out joint-detection a lot of.So, need the many field picture of storage, need a lot of memory spaces, in addition, the complexity of joint-detection also increases with the increase of the image number of fields that is used to judge;
When adopting block-based mode, generally be 8 * 8 piece, need read 8 line data, just can make the judgement of whether moving.And the calculating mean-square value, can use computing units such as multiplier.The scale of counting circuit is bigger;
Secondly, motion detection and rim detection are handled respectively, increased the complexity of design, increased requirements of data storage.
Summary of the invention
Embodiments of the invention technical problem to be solved is, the method and apparatus that provides a kind of video image to handle.Can unify motion detection and rim detection, simplify testing circuit.
In order to solve the problems of the technologies described above, embodiments of the invention have proposed the method that a kind of video image is handled, and comprising:
Arbitrary pixel is adjacent the magnitude relationship of the value of capable pixel in the detection video image, according to testing result, judges that video image is static or motion;
If move to video image after testing, then start rim detection the value of the pixel of described pixel and adjacent lines and adjacent column is detected, right with the pixel of choosing the difference minimum;
Pixel according to the selected difference minimum of rim detection is right, the video image that moves is carried out field interpolation calculate, and obtains the value of new pixel.
Correspondingly, embodiments of the invention also provide a kind of video image processing device, comprising:
Motion detection unit is used for detecting the magnitude relationship that the arbitrary pixel of video image is adjacent the value of capable pixel, according to testing result, judges that video image is static or motion;
Edge detection unit is used for detecting under the situation that video image is a motion state in described motion detection unit, and the value of the pixel of described pixel and adjacent lines and adjacent column is detected, and is right with the pixel of choosing the difference minimum of carrying out interpolation calculation;
The filtering interpolation unit, comprise the field interpolation module, be used for detecting under the situation that described video image is motion in motion detection unit, right according to the pixel of the selected difference minimum of rim detection, video image to motion carries out field interpolation calculating, obtains the value of new pixel.
The method of video image processing of the embodiment of the invention is handled the judgement of motion detection and the judgement unification that whether needs to carry out rim detection, has simplified circuit greatly.
Description of drawings
Fig. 1 is the used motion detection technique schematic diagram of the video image processing technology of prior art;
Fig. 2 is used motion detection of the video image processing technology of prior art and edge detecting technology schematic diagram;
Fig. 3 is the structural representation of the video image processing device that provides of the embodiment of the invention;
Fig. 4 is the schematic diagram that the pixel of the motion detection unit in the video image processing device that provides of the embodiment of the invention is chosen the selected pixel of module;
Fig. 5 is that dispensing unit in the video image processing device that provides of the embodiment of the invention is at the schematic diagram of the value that disposes symbolic number range0 and range1 to the influence of motion detection determination range;
Fig. 6 is the schematic flow sheet of the method for video image processing that provides of the embodiment of the invention;
Fig. 7 is the crenellated phenomena schematic diagram that the used pixel selecting method of video image processing technology occurs in the prior art;
Fig. 8 is the schematic diagram of pixel selecting method in the method for video image processing that provides of the embodiment of the invention.
Embodiment
In embodiments of the present invention, utilize the characteristic of the opposite field adjacent lines of video image, make up the motion detection algorithm that makes new advances, reduce requirement, and motion detection and rim detection unification are carried out, simplify circuit, improve the video image treatment effect memory space.
Referring to Fig. 3, be the structural representation of the video image processing device that provides of the embodiment of the invention;
In carrying out the video image processing procedure, usually video image will be carried out convergent-divergent handles, the convergent-divergent of image is handled the image that can use field, top and field, the end, therefore, compare with original image, scaled images can increase or delete or revise the value of some pixel, and these new pixels are that end field picture and top field picture are calculated by interpolation between the field or field interpolation.
Video image is handled, and interpolation between field interpolation and field be combined, if moving image then adopts field interpolation, if rest image then adopts interpolation between the field.
Consider following characteristics arranged between field, top and the end field picture:
Free precedence relationship between top and the end field picture, the variation of image normally gradually changes, and top field picture and end field picture are staggered in together.
Above characteristics show, when image does not move or move slower, then the variation between the adjacent lines of opposite field generally is continuous, also are that the N of frame figure is capable, N+1 is capable, the variation of N+2 between capable be continuous; Discontinuous situation generally mostly occurs in edge of image between opposite field and the adjacent lines, therefore, if discontinuous situation, both can make the judgement of image motion, also can make simultaneously and need carry out the judgement of rim detection.
Therefore, the embodiment of the invention provides a kind of video image processing device, comprising:
Particularly, motion detection unit 1 comprises:
Pixel is chosen module 10, and referring to Fig. 4, pixel is chosen module 10, be used for choosing the y that carries out video image capable on x the some place pixel (x y), and is pixel (x, alternative pixel when y) doing rim detection to (x-1, y-1), (x+1, y+1) }, (x, y-1), (x, and { (x+1 y+1) }, y-1), (x-1, y+1) };
If min{f (x, y-1), f (x, y+1) }+range0≤f (x, y)≤max{f (x, y-1), f (x, y+1) }+range1, judge that then video image is static;
If max{f (x, y-1), f (x, y+1) }+range1＜f (x, y) or min{f (x, y-1), f (x, y+1) }+(x y), judges that then video image moves to range0＞f;
Wherein, min{f (x, y-1), f (x, y+1) } be get f (x, y-1), f (x, the y+1) minimum value in, max{f (x, y-1), f (x, y+1) } be get f (x, y-1), (other by that analogy for x, the y+1) maximum in for f;
(x y) is that (x y) locates certain property value of pixel to f;
Range0 and range1 are configurable signed numbers.
The video image processing device that the embodiment of the invention provided also comprises with lower unit:
Dispensing unit 2 is used to dispose described signed number range0 and the range1 that is used for the adjustment movement detection range.In the time of specific implementation, dispensing unit 2 can be the value by software arrangements range0 and range1, also can regulate by the self adaptation of circuit, perhaps by reading the value that inside or external memory storage obtain range0 and range1.
Need to prove that range0 and the different number of range1 configuration can produce different influences to the determination range of motion detection, as mistake! Do not find Reference source.Shown in Figure 5.
Among Fig. 5, the box indicating on each subgraph left side is the determination range when not having range0 and range1, and the box indicating on the right is the determination range when range0 and range1 are arranged.
If range0＜0, range1＞0, the determination range of expansion motion detection is shown in A among Fig. 5;
If range0＞0, range1＜0 dwindles the determination range of motion detection, shown in B among Fig. 5;
If range0＞0, range1＞0 is moved on the determination range of motion detection, shown in C among Fig. 5;
If range0＜0, range1＜0, the determination range of motion detection moves down, shown in D among Fig. 5.
In motion detection, can select different range0 and the value of range1 according to the characteristics of image, the motion state of image is made only judgement, avoid because of judging that the improper image displaying quality that causes descends.
Pixel is to selecting module 31, and the result of calculation of described difference calculating module is compared in twos, selects the pixel of minimal difference right.
Pixel to the criterion of selecting module 31 to carry out the edge pixel selection is: select the pixel of difference minimum right, that is:
If | f (x-1, y-1)-f (x+1, y+1) |＜| f (x, y-1)-f (x, y+1) | and | f (x-1, y-1)-f (x+1, y+1) |＜| f (x+1, y-1)-f (x-1, y+1) |, select pixel to (x-1, y-1), (x+1, y+1) };
If | f (x+1, y-1)-f (x-1, y+1) |＜| f (x, y-1)-f (x, y+1) | and | f (x+1, y-1)-f (x-1, y+1) |＜| f (x-1, y-1)-f (x+1, y+1) |, select pixel to (x+1, y-1), (x-1, y+1) };
If below all do not satisfy, select pixel to (x, y-1), (x, y+1) }.
Referring to Fig. 6, the schematic flow sheet of the method for video image processing that provides for the embodiment of the invention.
At first, at step S100, as shown in Figure 4, choose the y that carries out in the video image capable on x the some place pixel (x y), and is pixel (x, alternative pixel when y) doing rim detection to (x-1, y-1), (x+1, y+1) }, (x, y-1), (x, and { (x+1 y+1) }, y-1), (x-1, y+1) };
At step S101, arbitrary pixel is adjacent the magnitude relationship of the value of capable pixel in the detection video image; Pixel according to the selected difference minimum of rim detection is right, the video image that moves is carried out field interpolation calculate, and obtains the value of new pixel
At step S102,, judge that video image is static or motion according to testing result; If judged result for being, then changes step S103 over to, if judged result then changes step S104 over to for not;
Wherein said motion detection criterion is as follows:
If min{f (x, y-1), f (x, y+1) }+range0≤f (x, y)≤max{f (x, y-1), f (x, y+1) }+range1, judge that then video image is static;
If max{f (x, y-1), f (x, y+1) }+range1＜f (x, y) or min{f (x, y-1), f (x, y+1) }+(x y), judges that then video image moves to range0＞f;
Wherein, min{f (x, y-1), f (x, y+1) } be get f (x, y-1), f (x, the y+1) minimum value in, max{f (x, y-1), f (x, y+1) } be get f (x, y-1), (other by that analogy for x, the y+1) maximum in for f;
(x y) is that (x y) locates certain property value of pixel to f;
Need to prove that range0 and the different number of range1 configuration can produce different influences to the determination range of motion detection, as mistake! Do not find Reference source.Shown in Figure 5.
Among Fig. 5, the box indicating on each subgraph left side is the determination range when not having range0 and range1, and the box indicating on the right is the determination range when range0 and range1 are arranged.
If range0＜0, range1＞0, the determination range of expansion motion detection is shown in A among Fig. 5;
If range0＞0, range1＜0 dwindles the determination range of motion detection, shown in B among Fig. 5;
If range0＞0, range1＞0 is moved on the determination range of motion detection, shown in C among Fig. 5;
If range0＜0, range1＜0, the determination range of motion detection moves down, shown in D among Fig. 5.
In motion detection, can select different range0 and the value of range1 according to the characteristics of image, the motion state of image is made only judgement, avoid because of judging that the improper image displaying quality that causes descends.
If do not have range0 and range1, the judgment criterion of motion detection is:
If min{f (x, y-1), f (x, y+1) }+range0≤f (x, y)≤max{f (x, y-1), f (x, y+1) }+range1, judge that then video image is static;
If max{f (x, y-1), f (x, y+1) }+range1＜f (x, y) or min{f (x, y-1), f (x, y+1) }+(x y), judges that then video image moves to range0＞f;
At this moment, the judgement whether image is moved fully by f (x, y-1), f (x, y), f (x, y+1) decision.When f (x y-1) is maximum, f (x, when y+1) being minimum value, no matter f (x, how many values y) is, all can make image is static judgement.Therefore, range0 and range1 are the cuttings point that influences judgment criterion.Can utilize the characteristics of image, range0 and range1 are configured to different numbers, make more appropriate judgement thereby whether image moved.
Need to prove, under the situation of when detecting video image, moving, need carry out field interpolation, if but field interpolation is only used the pixel of same vertical direction, that is to say, the value of new pixel only and directly over it with under pixel relevant, when the oblique line of processing shown in Fig. 7 A, the crenellated phenomena shown in Fig. 7 B can appear.
Solve the crenellated phenomena that occurs among Fig. 7 B, just can not with directly over and under pixel carry out interpolation, and to carry out interpolation with upper left side and bottom-right pixel.In order to select correct pixel, be necessary image is carried out rim detection.According to the result of rim detection, which decision adopts pixel is carried out field interpolation.After the rim detection, selectable pixel is a lot of to having, shown in Fig. 8 A.In order to simplify computing, in the reality optionally pixel to only with a upper left side-lower right, directly over-under, upper right side-lower left, shown in Fig. 8 B.
Therefore,, if move to video image after testing, then start rim detection the value of the pixel of described pixel and adjacent lines and adjacent column is detected at step S103, right with the pixel of choosing the difference minimum;
Right criterion promptly selects the pixel of difference minimum right to select suitable pixel, and algorithm is as follows:
If | f (x-1, y-1)-f (x+1, y+1) |＜| f (x, y-1)-f (x, y+1) | and | f (x-1, y-1)-f (x+1, y+1) |＜| f (x+1, y-1)-f (x-1, y+1) |, select pixel to (x-1, y-1), (x+1, y+1) };
If | f (x+1, y-1)-f (x-1, y+1) |＜| f (x, y-1)-f (x, y+1) | and | f (x+1, y-1)-f (x-1, y+1) |＜| f (x-1, y-1)-f (x+1, y+1) |, select pixel to (x+1, y-1), (x-1, y+1) };
If below all do not satisfy, select pixel to (x, y-1), (x, y+1) }.
At step S104, according to the result of motion detection, judge that draw video image is under the static situation, video image is carried out between the field interpolation handle, calculate the value of the pixel that makes new advances;
At step S105, right according to the pixel of the selected difference minimum of rim detection, video image is carried out field interpolation, calculate the value of the pixel that makes new advances;
Implement embodiments of the invention, can reduce the complexity of carrying out motion detection when video image is handled, thereby reduced the scale of motion detection circuit, and reduced the requirement of motion detection to memory space, the value that only needs to store two field data just can be finished motion detection, and according to the characteristics of image, selects different range0 and range1, the motion state of image is made optimal judgement, avoid descending because judge the improper image displaying quality that causes; Motion detection during embodiments of the invention are also handled video image and the unified processing of rim detection have been simplified circuit, thereby have been improved video image treatment effeciency and quality.
The above is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also are considered as protection scope of the present invention.
Claims (10)
1, a kind of method of video image processing is characterized in that, may further comprise the steps:
Arbitrary pixel is adjacent the magnitude relationship of the value of capable pixel in the detection video image, according to testing result, judges that video image is static or motion;
If detect video image and move, then start rim detection the value of the pixel of described pixel and adjacent lines and adjacent column is detected, right with the pixel of choosing the difference minimum;
Pixel according to the selected difference minimum of rim detection is right, the video image that moves is carried out field interpolation calculate, and obtains the value of new pixel.
2, the method for a kind of video image processing as claimed in claim 1 is characterized in that arbitrary pixel is adjacent the magnitude relationship of the value of capable pixel in the described detection video image, according to testing result, judges that video image is static or motion comprises:
On y in the selecting video image is capable x the some place pixel (x, y), and alternative pixel to (x, y-1), (x, y+1) };
If min{f (x, y-1), f (x, y+1) }+range0≤f (x, y)≤max{f (x, y-1), f (x, y+1) }+range1, judge that then video image is static;
If max{f (x, y-1), f (x, y+1) }+range1＜f (x, y) or min{f (x, y-1), f (x, y+1) }+(x y), judges that then video image moves to range0＞f;
(x y) is that (x y) locates the property value of pixel, and described range0 and range1 are configurable signed numbers to described f.
3, the method handled of a kind of video image as claimed in claim 1 or 2 is characterized in that, also comprises: if be static through the detected video image that comes of described motion detection, interpolation is calculated the value of new pixel between then adopting.
4, the method handled of a kind of video image as claimed in claim 1 or 2 is characterized in that, the step that the described pixel of choosing the difference minimum is right is as follows:
On y in the selecting video image is capable x the some place pixel (x, y), and alternative pixel to (x-1, y-1), (x+1, y+1) }, (x, y-1), (x, y+1) } and (x+1, y-1), (x-1, y+1) };
Calculating pixel (x-1, y-1) with pixel (x+1, y+1) difference between | f (x-1, y-1)-f (x+1, y+1) |, pixel (x+1, y-1) with pixel (x-1, y+1) difference between | f (x+1, y-1)-f (x-1, y+1) |, and pixel (x, y-1) with pixel (x, y+1) difference between | f (x, y-1)-f (x, y+1) |, described computing || be the calculating that takes absolute value;
The result of calculation of described difference calculating module is compared in twos, select the pixel of minimal difference right.
5, the method for a kind of video image processing as claimed in claim 4, described difference minimum pixel is as follows to selection criterion:
If | f (x-1, y-1)-f (x+1, y+1) |＜| f (x, y-1)-f (x, y+1) | and | f (x-1, y-1)-f (x+1, y+1) |＜| f (x+1, y-1)-f (x-1, y+1) |, then select pixel to (x-1, y-1), (x+1, y+1) };
If | f (x+1, y-1)-f (x-1, y+1) |＜| f (x, y-1)-f (x, y+1) | and | f (x+1, y-1)-f (x-1, y+1) |＜| f (x-1, y-1)-f (x+1, y+1) |, then select pixel to (x+1, y-1), (x-1, y+1) };
If abovely all do not satisfy, select pixel to (x, y-1), (x, y+1) };
Described f (x, y) be (x, y) locate the property value of pixel, described computing || be the calculating that takes absolute value.
6, a kind of video image processing device is characterized in that, comprising:
Motion detection unit is used for detecting the magnitude relationship that the arbitrary pixel of video image is adjacent the value of capable pixel, according to testing result, judges that video image is static or motion;
Edge detection unit is used for detecting under the situation that video image is a motion state in described motion detection unit, and the value of the pixel of described pixel and adjacent lines and adjacent column is detected, and is right to choose the pixel of carrying out interpolation calculation;
The filtering interpolation unit, comprise the field interpolation module, be used for detecting under the situation that described video image is motion in motion detection unit, right according to the pixel of the selected difference minimum of rim detection, video image to motion carries out field interpolation calculating, obtains the value of new pixel.
7, a kind of video image processing device as claimed in claim 6 is characterized in that, described motion detection unit comprises:
Pixel is chosen module, be used for choosing the y that carries out video image capable on x the some place pixel (x, y), and alternative pixel to (x-1, y-1), (x+1, y+1) }, (x, y-1), (x, y+1) } and (x+1, y-1), (x-1, y+1) };
Determination module is used for judging that according to the motion detection criterion video image is static or motion; Described motion detection criterion is:
If min{f (x, y-1), f (x, y+1) }+range0≤f (x, y)≤max{f (x, y-1), f (x, y+1) }+range1, judge that then video image is static;
If max{f (x, y-1), f (x, y+1) }+range1＜f (x, y) or min{f (x, y-1), f (x, y+1) }+(x y), judges that then video image moves to range0＞f.
8, a kind of video image processing device as claimed in claim 7 is characterized in that, described video image processing device also comprises:
Dispensing unit is used to dispose described signed number range0 and the range1 that is used for the adjustment movement detection range.
9, a kind of video image processing device as claimed in claim 8 is characterized in that, described edge detection unit comprises:
Difference calculating module, (x-1 is y-1) with pixel (x+1 to be used for calculating pixel, y+1) difference between | f (x-1, y-1)-f (x+1, y+1) |, pixel (x+1, y-1) with pixel (x-1, y+1) difference between | f (x+1, y-1)-f (x-1, y+1) |, and pixel (x, y-1) with pixel (x, y+1) difference between | f (x, y-1)-f (x, y+1) |, described computing || be the calculating that takes absolute value;
Pixel is to selecting module, and the result of calculation of described difference calculating module is compared in twos, selects the pixel of minimal difference right.
10, as each described a kind of video image processing device in the claim 6 to 9, it is characterized in that described filtering interpolation unit also comprises:
Interpolation module between, being used for detecting described video image in motion detection unit is under the static situation, an interpolation between adopting is calculated the value of new pixel.
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