CN1694507A - Method for strengthening edge of TV image - Google Patents
Method for strengthening edge of TV image Download PDFInfo
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- CN1694507A CN1694507A CN 200510020239 CN200510020239A CN1694507A CN 1694507 A CN1694507 A CN 1694507A CN 200510020239 CN200510020239 CN 200510020239 CN 200510020239 A CN200510020239 A CN 200510020239A CN 1694507 A CN1694507 A CN 1694507A
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Abstract
This invention discloses a method for enhancing edges of TV pictures including the following steps: first of all, detecting the brightness difference of adjacent pixels in the input image signals referring to the D-value of the brightness signal values subordinate to adjacent pixels, judging the zone where the brightness difference places based on the designed up and down limits of each brightness difference zone, in which, the zones with high and low brightness differences correspond to weak edge strength, the zone with the brightness difference at the middle section corresponds to strong edge strength, then edge enhancement is done based on the above strength values. Advantage: the degree of edge enhancement is determined based on the brightness difference of adjacent pixels to weaken the process to the zones with high or low brightness differences and thoroughly eliminate noise of edge enhancement.
Description
[technical field]
The present invention relates to the TV image treatment technology, be specifically related to a kind of TV image segmented edges Enhancement Method.
[background technology]
The development of digital television broadcasting in recent years is very swift and violent, developed countries such as the U.S., Japan, Europe have entered the digitized stage of the television broadcasting of carrying out in an all-round way, the U.S. not only is devoted to increase the program of high definition digital television, and be decided by to break in 2006 simulated television comprehensively, and China's wired digital TV in high resolution in numerous big and medium-sized cities has started broadcasting, and is determined at 2015 years simultaneously and breaks simulated television comprehensively.Because the transmission of Digital Television can cause damage hardly to program quality, so the user can almost be equal to the signal quality of studio at home.But, the television set of selling on the present market (particularly adopt the television set of new display spare, as LCDTV, PDPTV, DLPTV ...), because variety of problems can not show in high quality.
The development of image edge enhancement techniques is of long duration, and analog circuit generally adopts 2 subdifferentials to handle, and digital circuit generally adopts the mode of digital filtering.At present, a lot of television sets carry out " clear " in the user oriented display effect that pair image is all arranged in the interface that is provided with, " standard ", the function of selections such as " soft ", have even definition is set to up to a hundred adjustable grades, in fact these be exactly the selection that the edge is strengthened, the user is after making a kind of selection, display device will carry out unified edge strengthening to the signal of all inputs according to the parameter of setting to be handled, even if reluctantly image is transferred to sharper keen, but simultaneously often bring tangible crisperding noise, form dazzling coarse effect and be difficult to the clear state that reaches desirable.
[summary of the invention]
The technical problem to be solved in the present invention provides and a kind ofly can either improve image definition, thoroughly eliminates the method for strengthening edge of TV image of crisperding noise again.
For achieving the above object, the technical solution adopted in the present invention is that TV image segmented edges Enhancement Method comprises the steps: at first, detect the luminance difference of neighbor in the input image signal, described luminance difference is meant the difference of the affiliated brightness signal value of adjacent image point; Upper lower limit value according to each bright poor zone of setting is judged the residing zone of this luminance difference, wherein, comprises the corresponding weak crisperding intensity in zone of high brightness difference and low-light level difference or does not do the crisperding processing, and luminance difference is in the corresponding strong crisperding intensity in zone in stage casing; Carrying out crisperding according to above-mentioned crisperding intensity level again handles.
Preferably, it is five parts that described bright poor zone is divided into, 0 is limited to low bright difference zone under time bright difference, be limited under the inferior bright difference and be limited to low bright poor transitional region under the bright difference, be limited under the bright difference and be limited to medium bright difference zone on the bright difference, be limited on the bright difference on time bright difference and be limited to highlighted poor transitional region, being limited to the maximum brightness signal value on the inferior bright difference is highlighted difference zone; Wherein, the corresponding weak crisperding intensity in high and low bright difference zone or do not make crisperding and handle, the corresponding strong crisperding intensity in medium bright difference zone, the linear interpolation of corresponding its adjacent bright difference zone institute employing crisperding intensity of high and low bright poor transitional region.
More preferably, the value of described bright poor lower limit is 0%～50% of a maximum brightness signal value, and the value of the bright poor upper limit is 50%～100% of a maximum brightness signal value, and the value of the bright poor upper limit is greater than the value of bright poor lower limit.
Further preferably, described brightness signal value is divided into 256 grades, and the value of bright poor lower limit can be selected in 0～127, and the value of the bright poor upper limit can be selected in 128～255.
Further preferably, described brightness signal value is divided into 256 grades, and inferior bright poor lower limit is than low 8 grades of bright poor lower limit, and the bright poor upper limit is than low 64 grades of time bright poor upper limit.
The present invention adopts technique scheme, useful effect is: 1) adopt the method for segmentation specifically to determine the degree that the edge strengthens according to the luminance difference of adjacent image point, avoided the way of existing clean cut, reduction is handled the crisperding in the zone that comprises high brightness difference and low-light level difference, thoroughly eliminated the crisperding noise, and strengthen the crisperding in the zone that comprises the intermediate light difference is handled, can be obtained clear sharp keen image effect; 2) experiment showed, bright poor zone is reduced to five, can satisfy the needs of practical application substantially, reach segment processing effect preferably, have the simple computation of realization advantage fast simultaneously; 3) in each optimal way the division of brightness signal value is based on the brightness expressive ability of most existing display devices and fixed, and to the setting of bright poor upper limit value and lower limit value and time bright poor upper limit value and lower limit value be the applicant through a large amount of repeatedly experiments, consider at the same time and eliminate noise and obtain to draw under the situation of clear sharp keen image effect.
Below by embodiment also in conjunction with the accompanying drawings, the present invention is described in further detail:
[Figure of description]
Fig. 1 is that the regional segmentation of bright difference reaches and the corresponding schematic diagram of crisperding intensity.
Fig. 2 is the image without the edge enhancement process.
Fig. 3 is the image through the common edge enhancement process.
Fig. 4 is the image through segmented edges enhancement process of the present invention.
[embodiment]
Method for strengthening edge of TV image, comprise the steps: at first, detect the luminance difference of neighbor in the input image signal, described luminance difference is meant the difference of the affiliated brightness signal value of adjacent image point, and described brightness signal value can be divided according to the brightness changing capability of display device; Upper lower limit value according to each bright difference zone of setting is judged the residing zone of this luminance difference, wherein, comprises the corresponding weak crisperding intensity in zone of high brightness difference and low-light level difference, and luminance difference is in the corresponding strong crisperding intensity in zone in stage casing; Carrying out crisperding according to above-mentioned crisperding intensity level again handles.
In this example, described brightness signal value is from secretly being 0～255 totally 256 grades to showing the score; It is five that described bright poor zone is divided into, 0 is limited to low bright difference zone under time bright difference, be limited under the inferior bright difference and be limited to low bright poor transitional region under the bright difference, be limited under the bright difference and be limited to medium bright difference zone on the bright difference, be limited on the bright difference on time bright difference and be limited to highlighted poor transitional region, being limited to the maximum brightness signal value on the inferior bright difference is highlighted difference zone; Wherein, the corresponding weak crisperding intensity B in high and low bright difference zone, the corresponding strong crisperding intensity A in medium bright difference zone, the linear interpolation of corresponding its adjacent bright difference zone institute employing crisperding intensity of high and low bright poor transitional region.The regional segmentation of bright difference and with crisperding intensity corresponding the longitudinal axis is bright difference among Fig. 1 as shown in Figure 1, transverse axis is a crisperding intensity.In crisperding is handled, can also set concrete crisperding width value according to situations such as display screen size, effective number of picture elements, generally can between 1～2 pixel, select.
The contrast experiment: the S42SD-YD05 plasma module that adopts the production of Samsung SDI company is as display device, with its brightness by secretly being 0～255 totally 256 grades to showing the score, get 0～51 and be low bright difference zone, 52～60 are low bright poor transitional region, 61～134 is medium bright difference zone, 135～199 is highlighted poor transitional region, and 200～255 is highlighted difference zone.It is 135 that bright poor higher limit promptly is set, and bright poor lower limit is 60, and the crisperding intensity A is strong crisperding (crisperding intensity is big more, and then overshoot is high more up and down, and the edge is overstepping the bounds of propriety bright), and crisperding intensity B is 0, does not promptly make crisperding and handles, and sample range is whole pixels of input imagery.
To test image (as shown in Figure 2), carry out the common edge enhancement process, obtain Fig. 3; Carry out the segmented edges enhancement process with the inventive method, obtain Fig. 4.Comparison diagram 2,3,4 adopts the image table after the common edge enhancement process to reveal bigger crisperding noise as can be seen, and visual effect is coarse; And the visual topical manifestations that adopts the inventive method to carry out after the segmented edges enhancement process is clear sharp keen, and does not have dazzling crisperding noise.
In the present embodiment, in order to reduce amount of calculation, be unlikely to cause the delay of image demonstration, with bright poor area dividing is five, and adopt the algorithm of the corresponding single or linear interpolation crisperding intensity in each bright difference zone, in fact, for reaching fine and smooth edge reinforced effects, can also divide more bright difference zone, and various more careful function corresponding relations also can be adopted with crisperding intensity in bright difference zone.Experiment showed, that in the discernmible scope of human eye, the partition method of five-part form is comparatively rational.
Claims (5)
1, a kind of method for strengthening edge of TV image is characterized in that, comprises the steps: at first, detects the luminance difference of neighbor in the input image signal, and described luminance difference is meant the difference of the affiliated brightness signal value of adjacent image point; Upper lower limit value according to each bright poor zone of setting is judged the residing zone of this luminance difference, wherein, comprises the corresponding weak crisperding intensity in zone of high brightness difference and low-light level difference or does not do the crisperding processing, and luminance difference is in the corresponding strong crisperding intensity in zone in stage casing; Carrying out crisperding according to above-mentioned crisperding intensity level again handles.
2, method for strengthening edge of TV image according to claim 1, it is characterized in that: it is five parts that described bright poor zone is divided into, 0 is limited to low bright difference zone under time bright difference, be limited under the inferior bright difference and be limited to low bright poor transitional region under the bright difference, be limited under the bright difference and be limited to medium bright difference zone on the bright difference, be limited on the bright difference on time bright difference and be limited to highlighted poor transitional region, being limited to the maximum brightness signal value on the inferior bright difference is highlighted difference zone; Wherein, the corresponding weak crisperding intensity in high and low bright difference zone or do not make crisperding and handle, the corresponding strong crisperding intensity in medium bright difference zone, the linear interpolation of corresponding its adjacent bright difference zone institute employing crisperding intensity of high and low bright poor transitional region.
3, method for strengthening edge of TV image according to claim 2, it is characterized in that: the value of described bright poor lower limit is 0%～50% of a maximum brightness signal value, the value of the bright poor upper limit is 50%～100% of a maximum brightness signal value, and the value of the bright poor upper limit is greater than the value of bright poor lower limit.
4, method for strengthening edge of TV image according to claim 3 is characterized in that: described brightness signal value is divided into 256 grades, and the value of bright poor lower limit is 0～127, and the value of the bright poor upper limit is 128～255.
5, according to any described method for strengthening edge of TV image of claim 2～4, it is characterized in that: described brightness signal value is divided into 256 grades, and inferior bright poor lower limit is than low 8 grades of bright poor lower limit, and the bright poor upper limit is than low 64 grades of time bright poor upper limit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100202396A CN100362850C (en) | 2005-01-17 | 2005-01-17 | Method for strengthening edge of TV image |
| PCT/CN2005/000972 WO2006074584A1 (en) | 2005-01-17 | 2005-07-04 | A method for improving the display effect of display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100202396A CN100362850C (en) | 2005-01-17 | 2005-01-17 | Method for strengthening edge of TV image |
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| CN1694507A true CN1694507A (en) | 2005-11-09 |
| CN100362850C CN100362850C (en) | 2008-01-16 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375502C (en) * | 2006-03-30 | 2008-03-12 | 深圳创维－Rgb电子有限公司 | Video image edge enhancing method |
| CN101102515B (en) * | 2006-07-03 | 2010-06-16 | 三星电子株式会社 | Apparatus and method for correcting edge in an image |
| CN101207769B (en) * | 2006-12-15 | 2010-08-11 | 美国博通公司 | Method and system for providing video interface between video disc player and TV |
| CN101350181B (en) * | 2007-07-17 | 2011-03-30 | 索尼株式会社 | Signal processing device, signal processing method, and display apparatus |
| CN101155248B (en) * | 2006-09-26 | 2011-07-13 | 富士通株式会社 | Image processing apparatus, image processing method, and computer product |
| CN101616250B (en) * | 2008-06-25 | 2012-10-10 | 索尼株式会社 | Image processing apparatus and method, and program |
| CN104335567A (en) * | 2012-05-15 | 2015-02-04 | 夏普株式会社 | Video-processing device, video-processing method, television receiver, program, and recording medium |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106846270B (en) | 2017-01-05 | 2020-02-14 | 浙江大华技术股份有限公司 | Image edge enhancement method and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3545979B2 (en) * | 1999-11-30 | 2004-07-21 | シャープ株式会社 | Contour correction device |
| JP2002133419A (en) * | 2000-10-19 | 2002-05-10 | Mitsubishi Heavy Ind Ltd | Method and device for extracting object from image |
| JP3791003B2 (en) * | 2001-05-21 | 2006-06-28 | ソニー株式会社 | Image processing apparatus and method, recording medium, and program |
| JP4190221B2 (en) * | 2002-07-09 | 2008-12-03 | Ｈｏｙａ株式会社 | Image contour enhancement device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375502C (en) * | 2006-03-30 | 2008-03-12 | 深圳创维－Rgb电子有限公司 | Video image edge enhancing method |
| CN101102515B (en) * | 2006-07-03 | 2010-06-16 | 三星电子株式会社 | Apparatus and method for correcting edge in an image |
| US7956910B2 (en) | 2006-07-03 | 2011-06-07 | Samsung Electronics Co., Ltd. | Apparatus and method for correcting image edge |
| CN101155248B (en) * | 2006-09-26 | 2011-07-13 | 富士通株式会社 | Image processing apparatus, image processing method, and computer product |
| CN101207769B (en) * | 2006-12-15 | 2010-08-11 | 美国博通公司 | Method and system for providing video interface between video disc player and TV |
| CN101350181B (en) * | 2007-07-17 | 2011-03-30 | 索尼株式会社 | Signal processing device, signal processing method, and display apparatus |
| CN101616250B (en) * | 2008-06-25 | 2012-10-10 | 索尼株式会社 | Image processing apparatus and method, and program |
| CN104335567A (en) * | 2012-05-15 | 2015-02-04 | 夏普株式会社 | Video-processing device, video-processing method, television receiver, program, and recording medium |
| CN104335567B (en) * | 2012-05-15 | 2016-02-10 | 夏普株式会社 | Video process apparatus, method for processing video frequency, television receiver |
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| CN100362850C (en) | 2008-01-16 |
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