CN100391265C - A pseudo color inhibiting method with recursive protection - Google Patents
A pseudo color inhibiting method with recursive protection Download PDFInfo
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- CN100391265C CN100391265C CNB200510049597XA CN200510049597A CN100391265C CN 100391265 C CN100391265 C CN 100391265C CN B200510049597X A CNB200510049597X A CN B200510049597XA CN 200510049597 A CN200510049597 A CN 200510049597A CN 100391265 C CN100391265 C CN 100391265C
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Abstract
The present invention relates to a pseudo-color inhibiting method with recursive protection. The existing pseudo color inhibiting method reduces chrominance resolution. The method of the present invention comprises steps that (a) image brightness is used for motion judgment, and the judgment uses the size of difference between brightness signals of corresponding positions among adjacent fields for differentiating a motion type from a stationary type in an image pixel zone; in a step (b), a recursive judgment is made on pixels judged as being stationary in the step (a), and the judgment uses the chrominance information of corresponding positions of continuous N fields and the previously obtained result of judgment of pseudo colors for determining whether the pseudo colors actually exist in the pixel chromaticity; in a step (c), the chrominance values of the pixels which are judged as being stationary in the step (a) and determined to be the actual pseudo colors in the step (b) are averaged among frames. In the judgment of the present invention, pixels which do not generate the pseudo colors are not averaged, and only the pixels which generate the pseudo colors are averaged among frames; consequently, the preferable inhibiting effects of the pseudo colors can be reached.
Description
Technical field
The present invention is applied to digital television signal and handles, particularly a kind of pseudo color inhibiting method of recursive protection.
Background technology
In the videoblankingsync system, luminance signal and carrier chrominance signal are common Seize ACK message bandwidth.With the pal signal is example, and carrier chrominance signal U, V at first are modulated on the color sub-carrier of 4.43MHz in the mode of quadrature, and then on the luminance signal that is added to.The result of stack causes the high-frequency signal of carrier chrominance signal and brightness that overlapped part is arranged on frequency domain.When colour decoding was carried out the light tone separation, if adopt common light tone separation method, some luminance signal can be decoded into colourity, and some carrier chrominance signal also can be decoded into brightness.Brightness disturbs colourity to be called as " pseudo color " traditionally.
The pseudo color phenomenon of Chan Shenging is very general in real image for these reasons, and any brightness HFS all the pseudo color phenomenon may occur.Very common pseudo color phenomenon has thin striped shirt, lattice etc.Sometimes also can occur the situation that the border becomes " hair " on vertical border, this phenomenon is also caused by pseudo color.
When videoblankingsync carried out colour decoding, it was one of key step that light tone is separated, and it also is the main cause that produces pseudo color.The most simply be when light tone is separated, to adopt a low pass filter to add the method for a high pass filter.Low pass filter comes out brightness signal extraction, and high pass filter then is that carrier chrominance signal is extracted.Though the method is simple, effect is poor.Low pass filter all curbs the HFS of brightness, and the result will be that the details of image is seriously lost, and image boundary thickens.High pass filter all passes through brightness high-frequency signal and carrier chrominance signal, and the pseudo color phenomenon clearly.
Can reasonable inhibition pseudo color phenomenon when adopting comb filter to carry out the light tone separation.In the videoblankingsync system, no matter be Phase Alternation Line system or TSC-system, brightness and colourity are put transmission between all being.With the TSC-system signal is example, and the concentration of energy of luminance signal is being the center with the image carrier, video line rate (F
H) be near the spectral line at interval; Carrier chrominance signal is same, and signal energy concentrates on color sub-carrier (F
Sc) be starting point, line frequency is near the spectral line at interval.F
ScWhen adopting 3.579545MHz, the spectral line of brightness and colourity is interval F just
H/ 2, luminance signal and carrier chrominance signal do not overlap in fact fully at HFS, but with F
H/ 2 compartment is put.
Adopt two comb filter that frequency characteristic is different, one of them allows luminance signal pass through, and carrier chrominance signal is suppressed; Another one allows carrier chrominance signal pass through, and luminance signal is suppressed.The image that the method is all relatively concentrated the bright signal energy, grid behind promptly periodically more intense image such as the vertical bar has good filter effect.
Suppress the pseudo color except separate the employing method in light tone, also can adopt method for processing signals to carry out pseudo color for decoded bright signal and suppress.The method that common pseudo color suppresses mainly contains in interframe and the frame two kinds.No matter interframe still be in the frame pseudo color suppress, all be the opposite characteristic of pixel chrominance phase of utilizing continuously row or frame same position, it is asked on average obtain.With the pal signal is example, and the chrominance phase difference of the respective pixel of two continuous frames image is 90 degree, and by this rule, the chrominance phase difference of the image respective pixel of a frame is 180 degree at interval, and is promptly anti-phase.It just should be complementary the colourity of pseudo color parts of images and the colourity of interval one frame correspondence position occurring, and it is that the pseudo color phenomenon disappears that the color of complementation is asked averaged result.Except interval one two field picture has this chrominance phase complementary relationship, the image chroma phase place of delegation also has this relation at interval.But utilizing this relation to carry out pseudo color suppresses and will meet some requirements.Adopt interframe to carry out pseudo color and suppress, require image to have on time shaft periodically, it is static promptly requiring image; Adopt and carry out the pseudo color inhibition in the frame, require the image vertical direction to have periodically, i.e. vertical bar.If the discontented condition that is enough to, pseudo color suppresses and can't produce a desired effect.
In the existing interframe pseudo color inhibiting method of majority, only carry out motion determination, the image chroma of non-motion is all adopted the interframe averaging method.For a lot of rest images, they do not produce pseudo color, on average will cause the reduction of chroma resolution to the colourity of this part image.
Summary of the invention
The present invention is directed to this weak point of the chroma resolution of pseudo color inhibiting method reduction in the past, a kind of pseudo color inhibiting method based on recursive protection is provided.
Method of the present invention may further comprise the steps: (a) utilize image brightness to carry out motion determination, this judgement utilizes the luminance signal extent of respective pixel position between opposite field, and image pixel is distinguished into motion and standstill two classes; Step (b) is carried out the recurrence judgement to being judged as static pixel in the step (a), this judgement utilizes the chrominance information of respective pixel position, N continuous field and previous field to judge that the pseudo color judged result that obtains judges the colourity of this pixel and whether have pseudo color, 3≤N≤7 really; (c) be judged as static in the step (a) and in step (b) judgement average for the chromatic value of respective pixel position between the chromatic value of the pixel that has pseudo color really and consecutive frame.
Wherein the motion determination described in the step (a) is according to being correspondence position pixel intensity difference between opposite field, when difference is judged this pixel motion during greater than threshold value TH1, otherwise is judged as static.
Described step (b) is the principle that strong correlation should be arranged according to rest image opposite field respective pixel colourity, the pseudo color of judging with previous field exists possibility as the recurrence criterion, and with the colour difference sum of respective pixel position in the N continuous field as basic criterion, when the recurrence criterion is met simultaneously with basic criterion, is judged as pseudo color and exists.Described recurrence criterion comprises recurrence chromatic value and recurrence weight; Described recurrence chromatic value is the colourity correction value of previous field respective pixel position, and described recurrence weight is the possibility that respective pixel position, front court produces pseudo color; When recurrence chromatic value when simultaneously the recurrence weight is greater than threshold value TH3 greater than threshold value TH2, the recurrence criterion is met.Described basic criterion is declared a tree name substantially and is met during greater than threshold value TH4.When judging that pseudo color exists, former recurrence chromatic value and current pixel colourity are done on average, produce new recurrence chromatic value and increase the recurrence weight, recurrence chromatic value that upgraded and recurrence weight are carried out the judgement of next as the recurrence criterion of next field picture and the basic criterion of next field picture; When judging that pseudo color does not exist, get a fixed value as new recurrence chromatic value and reduce the recurrence weight according to the bit wide of chroma data, recurrence chromatic value that upgraded and recurrence weight are carried out the judgement of next as the recurrence criterion of next field picture and the basic criterion of next field picture.
According to the standard difference of videoblankingsync, different for the processing of the videoblankingsync of Phase Alternation Line system and TSC-system.Pal signal adopts is that the image of a frame at interval carries out pseudo color and suppresses, and is to need continuous 5 data at least in calculating therefore.What TSC-system adopted is that continuous frame carries out the pseudo color inhibition, therefore calculates continuous 3 data of minimum needs.
Step (c) is done interframe average out to this area current techique with chromatic value, is not repeated here.Threshold value TH1, TH2, TH3, TH4 are the practical application value, determine according to the signal quantization bit wide.
The method of having used recurrence in the present invention suppresses to protect to pseudo color, and the effect of recurrence is to judge the image-region of real generation pseudo color, and pseudo color is carried out in this zone suppress.The main thought of this method judges according to the recurrence chromatic value and the recurrence colourity weight of a last reference frame whether the colourity of current pixel is to be produced by pseudo color.This method does not believe easily that certain colourity is to be produced by pseudo color, relies on recurrence and judges, credibility increases gradually and reaches certain threshold value in the judgement of continuous multiple frames, and what be enough to trust just is considered to pseudo color.Be judged as in the pixel that does not produce pseudo color and do not average, and it is average just to carry out interframe for the pixel that produces pseudo color, pseudo color suppresses effect thereby reach preferably.
Description of drawings
Fig. 1 the present invention realizes block diagram;
Fig. 2 moves and adjudicates is required pixel;
Fig. 3 recurrence is adjudicated required pixel map;
The flow chart of Fig. 4 recurrence judgement;
The judgement of Fig. 5 recurrence realizes block diagram;
Fig. 6 flow chart of the present invention.
Embodiment
Fig. 1 provides the realization block diagram of the related pseudo color inhibiting method of present embodiment.101 is motion determination modules, and it carries out motion detection to the luminance signal of image.Whether it exists motion according to the difference section of the declaring image of opposite field image respective pixel, and provides the motion sign.Recurrence judging module 102 is major parts of this method, and it utilizes candidate pixel chromatic value, recurrence chromatic value and recurrence weight and threshold value TH2, and TH3, TH4 come whether the colour of decision diagram picture is the colour that is that is caused by crosstalking of brightness.Whether the recurrence court verdict that motion sign that motion judging module 101 obtains and recurrence judging module 102 calculate carries out the foundation that interframe is on average gone pseudo color to colourity as the average module 104 of interframe colourity.103 are depicted as frame time delay module among the figure, and the effect of this module is that the carrier chrominance signal of input is done time-delay, and the length of concrete time-delay is relevant with application.In the television system of Phase Alternation Line system, 180 degree paraphase phenomenons can appear in the image chroma of a frame at interval.In the realization of the pal television signal being carried out the pseudo color inhibition, to adopt 2 one frames time-delays at least.In the TSC-system television system, 180 degree paraphase phenomenons can appear in adjacent two two field pictures.In the realization of the TSC-system TV signal being carried out the pseudo color inhibition, to adopt 1 one frame time-delay at least.
The schematic diagram of the required luminance pixel of Fig. 2 motion detection.The actual TV signal is with the transmission of interlacing form, and a two field picture is split into strange and idol field.Pixel selection scheme shown in the figure is a kind of in the motion detection institute employing scheme in the present embodiment.Utilize pixel A, B, C in twos between the absolute value of luminance difference and the magnitude relationship of decision threshold TH1, provide the motion sign of image.When the absolute value of luminance difference is judged as motion during greater than threshold value TH1; When the absolute value of luminance difference is judged as during less than threshold value TH1 static.
Fig. 3 judges required chroma pixel position view for carrying out the colourity recurrence.Select for use continuous 5 colourity to judge among the figure, the pseudo color that this choosing method is applied to pal signal suppresses.When the pseudo color of carrying out the TSC-system TV signal suppresses, can adopt continuous 3 carrier chrominance signal to judge and suppress.
Fig. 4 has introduced the flow process of recurrence judgement.At first begin most 401 pairs of recurrence chromatic values and the initialization of recurrence weight in calculating.If each opposite field colourity of current calculating satisfies basic criterion 402 and enters 403 and carry out the recurrence chromatic value and judge, otherwise enters 407.The colour difference sum of the candidate pixel of each correspondence position thinks that declaring a tree name substantially is met during greater than threshold value TH4.407 think that this pixel does not satisfy the pseudo color criterion, and this place's colourity does not increase the possibility that pseudo color occurs.The 403 pairs of recurrence chromatic values and threshold value TH2 compare, and less than threshold value TH2, are judged to non-pseudo color as the recurrence chromatic value, but will upgrade and increase the recurrence weight the recurrence chromatic value, illustrate that the pseudo color possibility of this position has increased.As the recurrence chromatic value greater than threshold value TH2, then enter next judgement link 404 and carry out the judgement of recurrence weight, if current recurrence weight is less than TH3, it is very unreliable to illustrate that current pixel is judged as pseudo color, can not think pseudo color, but should increase the possibility of pseudo color, promptly increase the recurrence weight.Greater than TH3, think that the pixel of decision region exists the possibility of pseudo color enough big as recurrence weight in 404 so this moment, can think pseudo color to occur, and on average carry out pseudo color according to interframe and suppress, judge the flow process end.
Fig. 5 is the block diagram that recurrence judgement realizes, 501 is recurrence judging module, and it is by to the calculating of input pixel colourity and relatively adjudicating of input pixel colourity and recurrence chromatic value.502 on the one hand provide recurrence chromatic value and recurrence weight for 501, also by 501 court verdict recurrence chromatic value and recurrence weight are upgraded on the other hand.
Fig. 6 is that present embodiment is realized the flow chart that pseudo color suppresses.Adjudicate twice judgement through motion judgement and recurrence pseudo color, it is average that the image that is defined as pseudo color is carried out interframe, and non-pseudo color colourity is not partly done average treatment.
Claims (7)
1. pseudo color inhibiting method with recursive protection, it is characterized in that this method may further comprise the steps: (a) utilize image brightness to carry out motion determination, this judgement utilizes the luminance signal extent of respective pixel position between opposite field, and image pixel is distinguished into motion and standstill two classes; Step (b) is carried out the recurrence judgement to being judged as static pixel in the step (a), this judgement utilizes the chrominance information of respective pixel position, N continuous field and previous field to judge that the pseudo color judged result that obtains judges the colourity of this pixel and whether have pseudo color, 3≤N≤7 really; (c) be judged as static in the step (a) and in step (b) judgement average for the chromatic value of respective pixel position between the chromatic value of the pixel that has pseudo color really and consecutive frame.
2. a kind of pseudo color inhibiting method with recursive protection as claimed in claim 1; it is characterized in that the motion determination basis described in the step (a) is a correspondence position pixel intensity difference between opposite field; when difference is judged this pixel motion during greater than threshold value TH1, otherwise be judged as static.
3. a kind of pseudo color inhibiting method with recursive protection as claimed in claim 1; it is characterized in that described step (b) is to exist possibility as the recurrence criterion with the pseudo color that previous field is judged; and with the colour difference sum of respective pixel position in the N continuous field as basic criterion; when the recurrence criterion is met simultaneously with basic criterion, is judged as pseudo color and exists.
4. a kind of pseudo color inhibiting method with recursive protection as claimed in claim 3, it is characterized in that described recurrence criterion comprises recurrence chromatic value and recurrence weight, described recurrence chromatic value is the colourity correction value of previous field respective pixel position, and described recurrence weight is the possibility that respective pixel position, front court produces pseudo color; When recurrence chromatic value when simultaneously the recurrence weight is greater than threshold value TH3 greater than threshold value TH2, the recurrence criterion is met; When judging that pseudo color exists, former recurrence chromatic value and current pixel colourity are done on average, produce new recurrence chromatic value and increase the recurrence weight, recurrence chromatic value that upgraded and recurrence weight are carried out the judgement of next as the recurrence criterion of next field picture and the basic criterion of next field picture; When judging that pseudo color does not exist, get a fixed value as new recurrence chromatic value and reduce the recurrence weight according to the bit wide of chroma data, recurrence chromatic value that upgraded and recurrence weight are carried out the judgement of next as the recurrence criterion of next field picture and the basic criterion of next field picture.
5. a kind of pseudo color inhibiting method with recursive protection as claimed in claim 3 when it is characterized in that described basic criterion greater than threshold value TH4, is declared a tree name substantially and is met.
6. a kind of pseudo color inhibiting method with recursive protection as claimed in claim 1 is characterized in that it is to utilize the chrominance information of continuous 3 respective pixel positions and previous field to judge that the pseudo color judged result that obtains judges the colourity of this pixel and whether have pseudo color really that described recurrence is judged.
7. a kind of pseudo color inhibiting method with recursive protection as claimed in claim 1 is characterized in that it is to utilize the chrominance information of continuous 5 respective pixel positions and previous field to judge that the pseudo color judged result that obtains judges the colourity of this pixel and whether have pseudo color really that described recurrence is judged.
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| CN100568983C (en) * | 2007-10-29 | 2009-12-09 | 威盛电子股份有限公司 | Video signal picture element point chromatic value regulation means |
| CN104093011B (en) * | 2014-07-22 | 2016-09-14 | 浙江宇视科技有限公司 | A kind of pseudo color inhibiting method and device |
| CN113905183B (en) * | 2021-08-25 | 2024-04-16 | 珠海全志科技股份有限公司 | Color difference correction method and device for wide dynamic range image |
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|---|---|---|---|---|
| JPH0530530A (en) * | 1991-07-22 | 1993-02-05 | Toshiba Corp | Movement adaptive brightness signal/chrominance signal separating circuit |
| US5585861A (en) * | 1991-03-14 | 1996-12-17 | Mitsubishi Denki Kabushiki Kaisha | Luminance and chrominance signals separating filter adaptive to movement of image |
| JP2004128936A (en) * | 2002-10-03 | 2004-04-22 | Matsushita Electric Ind Co Ltd | Video signal processor |
| WO2004114680A1 (en) * | 2003-06-20 | 2004-12-29 | Koninklijke Philips Electronics N.V. | Luminance and color separation |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5585861A (en) * | 1991-03-14 | 1996-12-17 | Mitsubishi Denki Kabushiki Kaisha | Luminance and chrominance signals separating filter adaptive to movement of image |
| JPH0530530A (en) * | 1991-07-22 | 1993-02-05 | Toshiba Corp | Movement adaptive brightness signal/chrominance signal separating circuit |
| JP2004128936A (en) * | 2002-10-03 | 2004-04-22 | Matsushita Electric Ind Co Ltd | Video signal processor |
| WO2004114680A1 (en) * | 2003-06-20 | 2004-12-29 | Koninklijke Philips Electronics N.V. | Luminance and color separation |
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Address after: No. 90, Wensanlu Road, Hangzhou, Zhejiang, Xihu District Patentee after: Hangzhou National Chip Science & Technology Co., Ltd. Address before: 5A, Neusoft building, No. 99 Huaxing Road, Hangzhou, Zhejiang, Xihu District Patentee before: Hangzhou Guoxin Science & Technology Co., Ltd. |