CN101316320B - Image processing process for image processing system and correlated image processing apparatus - Google Patents
Image processing process for image processing system and correlated image processing apparatus Download PDFInfo
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- CN101316320B CN101316320B CN200710106385XA CN200710106385A CN101316320B CN 101316320 B CN101316320 B CN 101316320B CN 200710106385X A CN200710106385X A CN 200710106385XA CN 200710106385 A CN200710106385 A CN 200710106385A CN 101316320 B CN101316320 B CN 101316320B
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Abstract
The invention discloses an image processing method used for an image process system, which is used for promoting image quality after sharpening process and comprises the steps that: a plurality of original image data are received; a sharpening process is carried out to the original image data so as to generate a plurality of sharpening image data; according to the original image data, a plurality of sharpening image data are adjusted; the sharpening image data adjusted are output.
Description
Technical field
The present invention relates to a kind ofly, relate in particular to and a kind ofly can effectively suppress to increase excessively and the image processing method and the associated picture processing unit thereof of background noise in image processing method that is used for an image processing system and associated picture processing unit thereof.
Background technology
In the known digital image processing system, image processor may be interlaced to progressive conversion (at the signal of staggered type), image zoom processing, displacement and rim detection and interpolation and color space conversion or the like to data image signal.There is some running to need to use low-pass interpolation filters in these image processing, can causes image sharpness to reduce.For example, in the television broadcasting signal display system of NTSC specification, come display image data with staggered interlace mode.Interlace mode produces in response to the running characteristic of conventional cathode ray tube (CRT), be used in the procedure for displaying of each picture the scanning display screen twice, operation principle is that an image frame is divided into two figure, wherein a figure field is made up of odd-numbered scan lines, and another figure field then is made up of the even-line interlace line.As for being interlaced to the conversion of lining by line scan, can use low-pass filtering treatment owing in its transfer process, so can reduce the image sharpness after lining by line scan.In addition, image zoom is handled the situation that also can cause image sharpness to reduce.Image zoom is handled the image that amplifies or dwindle a specific format, so that it meets another kind of form.For example, aspect ratio of the picture is that 4: 3 standard NTSC image must carry out level and vertically scale and handles, and just can be presented at length-width ratio and is on 16: 9 the display screen.That is the signal that television reception arrives must be handled through convergent-divergent, meets the view data of the form of institute's desire demonstration with generation.This operation includes the handling procedure of low pass interpolation equally, so the problem that also can cause the scaled images sharpness to reduce.
Generally speaking, any image processing process that includes low pass interpolation filtering characteristic all can cause the loss of parts of images details.Therefore, known technology can increase the step of control image sharpness usually in the middle of some link of view data processing procedure.Common mode is to utilize peaking (Peaking) to handle sharper keenization of edge that makes in the image, to strengthen the visual effect of image border.Yet known peaking handling procedure but tends to cause the edge of image position to have and increases the excessively bad situation generation of (overshoot), thereby has reduced the image quality of image.
Please refer to Fig. 1, Fig. 1 is the calcspar of known sharp keen chemical control system unit 10.Sharp keen chemical control system unit 10 includes a high pass filter 100, a coring (Coring) arithmetic element 102, a multiplier 104 and an adder 106.High pass filter 100 can carry out high-pass filtering to received image signal to be handled.Then, 102 pairs of filtered picture signals of coring arithmetic element are carried out non-linear coring functional operation, and its pairing input and output relation are as shown in Figure 2.As shown in Figure 2, only the data in noise level (Th represents with threshold value) both sides just can be used to, and eliminating the noise in the data, and the data that will be lower than threshold value reduce to 0.Then, multiplier 104 is multiplied by a zoom factor (Scaling Factor is called gain again) SF increasing or to reduce signal quantity with the operation result of coring arithmetic element 102, and then merges with original image.
In sharp keen chemical control system unit 10, the information of high frequency can be passed through high pass filter 100, so aforesaid sharpness is adjusted the edge that program can be strengthened higher-frequency in the image, that is, only there are point-like thing and cornerwise part to have the effect of reinforcement.In other words, sharp keen chemical control system unit 10 can significantly strengthen the sharpness of hard edge (HardEdge), but then very limited for the sharpness reinforced effects of soft edges (Soft Edge).Be not significant especially edge on the alleged herein soft edges finger vision, change formed image border as edge comparatively fuzzy in the image or by brightness slightly.Hard edge then refers to visually very obvious and apparent edge, changes formed image border as sharp contrast or violent brightness.The sharp keen chemical control system unit 100 of Fig. 1 can utilize multiplier 104 to adjust the gain of picture signal.Because be very little value with the corresponding composition of soft edges in the high pass filter 100 filtered picture signals, even adjusted gain, the image sharpness of soft edges part also only can obtain quite limited reinforced effects.On the contrary, be very large value with the corresponding composition of hard edge in the filtered picture signal, after having adjusted gain, the image sharpness of hard edge part can obtain the reinforced effects of highly significant.But this is not an ideal situation, because hard edge is exactly very apparent edge in the original image in definition originally, so in fact the part that should strengthen is the part of soft edges.Yet,, can cause the image of hard edge part to produce increasing excessively (Overshoot) and background noise also can be exaggerated if zoom factor SF is risen to the level that is enough to effectively strengthen soft edges.Therefore, increase excessive bad result for fear of causing the image hard edge partly to produce, known sharp keen chemical control system unit 100 only can provide soft edges quite limited sharpness reinforced effects.
Summary of the invention
Therefore, main purpose of the present invention promptly is to be provided for the image processing method and the associated picture processing unit thereof of an image processing system.
The present invention discloses a kind of image processing method that is used for an image processing system, in order to promote the quality of the image after sharp keenization processing, includes a plurality of raw image datas of reception; These a plurality of raw image datas are carried out sharp keenization processing, to produce a plurality of sharp keenization view data; According to these a plurality of raw image datas, adjust this a plurality of sharp keenization view data; And export adjusted these a plurality of sharp keenization view data.
The present invention also discloses a kind of image processing apparatus that is used for an image processing system, in order to promote the quality of the image after sharp keenization processing, includes a receiving terminal, is used for receiving a plurality of raw image datas; One sharp keen chemical control system unit is coupled to this receiving terminal, is used for these a plurality of raw image datas are carried out sharp keenization processing, to produce a plurality of sharp keenization view data; One sharp keenization compensating unit is coupled to this receiving terminal and this sharp keen chemical control system unit, is used for adjusting this a plurality of sharp keenization view data according to these a plurality of raw image datas; And an output, be coupled to this sharp keenization compensating unit, be used for exporting adjusted these a plurality of sharp keenization view data.
Description of drawings
Fig. 1 is the calcspar of known sharp keen chemical control system unit.
Fig. 2 is pairing input of non-linear coring functional operation and output relation schematic diagram.
Fig. 3 is used for the schematic diagram of the image processing flow process of an image processing system for the embodiment of the invention.
Fig. 4 is used for the schematic diagram of the image processing apparatus of an image processing system for the embodiment of the invention.
The reference numeral explanation
10 sharp keen chemical control system unit
100 high pass filters
102 coring arithmetic elements
104 multipliers
106 adders
30 image processing flow processs
300,302,304,306,308,310 steps
40 image processing apparatus
400 receiving terminals
402 sharp keen chemical control system unit
404 sharp keenization compensating units
406 outputs
IN (m)～IN (n) raw image data
IN_S (m)～sharp keenization of IN_S (n) view data
OUT adjusts the result
Embodiment
Please refer to Fig. 3, Fig. 3 is used for the schematic diagram of the image processing flow process 30 of an image processing system for the embodiment of the invention.Image processing flow process 30 can promote the picture quality after sharp keenization processing, and it comprises following steps:
Step 300: beginning.
Step 302: receive a plurality of raw image datas.
Step 304: these a plurality of raw image datas are carried out sharp keenization processing, to produce a plurality of sharp keenization view data.
Step 306:, adjust this a plurality of sharp keenization view data according to these a plurality of raw image datas.
Step 308: export adjusted these a plurality of sharp keenization view data.
Step 310: finish.
According to image processing flow process 30, the present invention after sharp keenization processing, according to the value of raw image data, adjusts sharp keenization view data in raw image data.In other words, when raw image data after sharpening is handled, meeting of the present invention is according to raw image data, adjusts the view data after sharp keenization, to avoid increasing excessively and to prevent that background noise is exaggerated.
In image processing flow process 30, step 304 pair raw image data carries out sharp keenization processing, it can any sharp keenization handling process be realized, after earlier raw image data being carried out high-pass filtering computing and coring computing, again the coring operation result be multiply by a yield value and with corresponding raw image data addition, to produce sharp keenization view data.In addition, preferably, step 306 is adjusted the view data after sharp keenization processing according to the maximum and the minimum value of raw image data.For instance, if the value of a sharp keenization view data is during greater than the maximum of a plurality of raw image datas, the maximum that the value of this sharp keenization view data can be made as these a plurality of raw image datas maybe will this sharp keenization view data value divided by a default value, with the value of this sharp keenization view data that decays.On the contrary, if the value of a sharp keenization view data is during less than the minimum value of a plurality of raw image datas, the minimum value that then value of this sharp keenization view data can be made as these a plurality of raw image datas maybe will this sharp keenization view data on duty with a default value, to amplify the value of this sharp keenization view data.Thus, can avoid increasing problem excessive and that background noise is exaggerated.
In known technology, when by promoting zoom factor (being yield value) when strengthening soft edges, the image of hard edge part can produce and increase excessive phenomenon, and background noise also can be exaggerated, thereby causes image quality decrease.In comparison, the present invention is according to the extreme value of raw image data, and appropriateness is adjusted the data after sharp keenization.Therefore, when promoting the intensity of soft edges parts of images, the image generation that the present invention can suppress the hard edge part increases excessive phenomenon, and avoids background noise to be exaggerated.
Hardware about image processing flow process 30 realizes that please refer to Fig. 4, Fig. 4 is used for the schematic diagram of an image processing apparatus 40 of an image processing system for the embodiment of the invention.Image processing apparatus 40 can promote the picture quality after sharp keenization processing, and it includes a receiving terminal 400, one sharp keen chemical control system unit 402, a sharp keenization compensating unit 404 and an output 406.In image processing apparatus 40, sharp keen chemical control system unit 402 carries out sharp keenization processing in order to raw image data IN (m)～IN (n) that receiving terminal 400 is received, to produce sharp keenization view data IN_S (m)～IN_S (n), sharp keenization compensating unit 404 is then adjusted sharp keenization view data IN_S (m)～IN_S (n) according to raw image data IN (m)～IN (n), and adjusts OUT as a result by output 406 outputs.Therefore, when raw image data IN (m)～IN (n) after 402 sharpenings of sharp keen chemical control system unit are handled, sharp keenization compensating unit 404 can be according to raw image data IN (m)～IN (n), adjust view data IN_S (the m)～IN_S (n) after sharp keenization, to avoid increasing excessively and to prevent that background noise is exaggerated.
In Fig. 4, sharp keen chemical control system unit 402 can be any circuit of realizing sharp keenization computing or device etc., as the sharp keen chemical control system unit 10 of Fig. 1.On the other hand, preferably, sharp keenization compensating unit 404 is adjusted sharp keenization view data IN_S (m)～IN_S (n) according to maximum and the minimum value of raw image data IN (m)～IN (n).For instance, if the value of a sharp keenization view data IN_S (i) is during greater than the maximum MAX of raw image data IN (m)～IN (n), the value of sharp keenization view data IN_S (i) can be made as maximum MAX, with the value of the sharp keenization view data IN_S (i) that decays; On the contrary, if the value of sharp keenization view data IN_S (i) during less than the minimum value MIN of raw image data IN (m)～IN (n), then can be made as minimum value MIN with the value of sharp keenization view data IN_S (i), to amplify the value of this sharp keenization view data.In this case, sharp keenization compensating unit 404 can be realized (relevant letter formula computing is that industry is known, repeats no more) by following program code:
MAX＝max(IN(m)，IN(m+1)，...IN(n-1)，IN(n))
MIN＝min(IN(m)，IN(m+1)，...IN(n-1)，IN(n))
if(IN_S(i)＞MAX)
OUT＝MAX；
else?if(IN_S(i)＜MIN)
OUT＝MIN；
else
OUT＝IN_S(i)；
end
In addition, also can be during greater than maximum MAX in the value of sharp keenization view data IN_S (i), with the value of sharp keenization view data IN_S (i) divided by a default value, and in the value of sharp keenization view data IN_S (i) during less than minimum value MIN, on duty with sharp keenization view data IN_S (i) with this default value, then Dui Ying program code is as follows:
MAX＝max(IN(m)，IN(m+1)，...IN(n-1)，IN(n))
MIN＝min(IN(m)，IN(m+1)，...IN(n-1)，IN(n))
if(IN_S(i)＞MAX)
OUT＝IN_S(i)/A；
else?if(IN_S(i)＜MIN)
OUT＝IN_S(i)*B；
else
OUT＝IN_S(i)；
end
Wherein, A, B represent default value.
What pay special attention to is, the said procedure code is only for realizing the embodiment of sharp keenization compensating unit 404, and those skilled in the art can design the circuit that meets demand, program code etc., and are not limited thereto.
In sum, the present invention is according to the extreme value of raw image data, and appropriateness is adjusted the data after sharp keenization.Therefore, when promoting the intensity of soft edges parts of images, the image generation that the present invention can effectively suppress the hard edge part increases excessive phenomenon, and avoids background noise to be exaggerated.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (14)
1. image processing method that is used for an image processing system in order to promote the quality of the image after sharp keenization processing, includes:
Receive a plurality of raw image datas;
These a plurality of raw image datas are carried out sharp keenization processing, to produce a plurality of sharp keenization view data;
According to these a plurality of raw image datas, adjust this a plurality of sharp keenization view data; And
Export adjusted these a plurality of sharp keenization view data,
Wherein these a plurality of raw image datas are carried out sharp keenization processing to produce these a plurality of sharp keenization view data, include:
These a plurality of raw image datas are carried out the high-pass filtering computing, to produce a plurality of high-pass filtering operation results;
These a plurality of high-pass filtering operation results are carried out the coring computing, to produce a plurality of coring operation results;
Should multiply by a yield value by a plurality of coring operation results, strengthen data to produce a plurality of edges; And
Each edge reinforcement data that these a plurality of edges are strengthened in data are distinguished addition with the corresponding raw image data in these a plurality of raw image datas, with these a plurality of sharp keenization view data of generation,
Wherein adjust the maximum and the minimum value of these a plurality of sharp keenization view data system these a plurality of raw image datas of basis, adjust this a plurality of sharp keenization view data according to this a plurality of raw image datas.
2. image processing method as claimed in claim 1, wherein according to maximum and these a plurality of sharp keenization view data of minimum value adjustment of this a plurality of raw image datas, promptly in the value of a sharp keenization view data of these a plurality of sharp keenization view data during greater than the maximum of these a plurality of raw image datas, the value of this sharp keenization view data that decays.
3. image processing method as claimed in claim 2, the value that the value of this sharp keenization view data that wherein decays system will this sharp keenization view data is made as the maximum of these a plurality of raw image datas.
4. image processing method as claimed in claim 2, the value that the value of this sharp keenization view data that wherein decays system will this sharp keenization view data is divided by a default value.
5. image processing method as claimed in claim 1, wherein according to maximum and these a plurality of sharp keenization view data of minimum value adjustment of this a plurality of raw image datas, promptly during less than the minimum value of these a plurality of raw image datas, amplify the value of this sharp keenization view data in the value of a sharp keenization view data of these a plurality of sharp keenization view data.
6. image processing method as claimed in claim 5 wherein amplifies the minimum value that value that the value system of this sharp keenization view data will this sharp keenization view data is made as these a plurality of raw image datas.
7. image processing method as claimed in claim 5 wherein amplifies on duty with a default value that the value system of this sharp keenization view data will this sharp keenization view data.
8. image processing apparatus that is used for an image processing system in order to promote the quality of the image after sharp keenization processing, includes:
One receiving terminal is used for receiving a plurality of raw image datas;
One sharp keen chemical control system unit is coupled to this receiving terminal, is used for these a plurality of raw image datas are carried out sharp keenization processing, to produce a plurality of sharp keenization view data;
One sharp keenization compensating unit is coupled to this receiving terminal and this sharp keen chemical control system unit, is used for adjusting this a plurality of sharp keenization view data according to these a plurality of raw image datas; And
One output is coupled to this sharp keenization compensating unit, is used for exporting adjusted these a plurality of sharp keenization view data,
Wherein this sharp keen chemical control system unit pack contains:
One high pass filter is coupled to this receiving terminal, is used for these a plurality of raw image datas are carried out the high-pass filtering computing, to produce a plurality of high filtering operation results;
One coring arithmetic element is coupled to this high pass filter, is used for these a plurality of high filtering operation results are carried out the coring computing, to produce a plurality of coring operation results;
One multiplier is coupled to this coring arithmetic element, is used for these a plurality of coring operation results be multiply by a yield value, strengthens data to produce a plurality of edges; And
One adder is coupled to this multiplier and this receiving terminal, is used for each edge reinforcement data that these a plurality of edges are strengthened in the data are distinguished addition with the corresponding raw image data in these a plurality of raw image datas, and with these a plurality of sharp keenization view data of generation,
Wherein this sharp keenization compensating unit includes:
One extreme value judging unit is coupled to this receiving terminal, is used for judging the maximum and the minimum value of these a plurality of raw image datas; And
One limiter is coupled to this extreme value judging unit and this sharp keen chemical control system unit, is used for the maximum and the minimum value of these a plurality of raw image datas of basis, adjusts this a plurality of sharp keenization view data.
9. image processing apparatus as claimed in claim 8, wherein this limiter is in the value of a sharp keenization view data of these a plurality of sharp keenization view data during greater than the maximum of these a plurality of raw image datas, the value of this sharp keenization view data that decays.
10. image processing apparatus as claimed in claim 9, wherein decay value that the value system of this sharp keenization view data will this sharp keenization view data of this limiter is made as the maximum of these a plurality of raw image datas, with the value of this sharp keenization view data that decays.
11. image processing apparatus as claimed in claim 9, wherein this limiter is decayed value that the value system of this sharp keenization view data will this sharp keenization view data divided by a default value, with the value of this sharp keenization view data that decays.
12. image processing apparatus as claimed in claim 8, wherein this limiter during less than the minimum value of these a plurality of raw image datas, amplifies the value of this sharp keenization view data in the value of a sharp keenization view data of these a plurality of sharp keenization view data.
13. image processing apparatus as claimed in claim 12, wherein this limiter amplifies the minimum value that value that the value system of this sharp keenization view data will this sharp keenization view data is made as these a plurality of raw image datas, to amplify the value of this sharp keenization view data.
14. image processing apparatus as claimed in claim 12, wherein this limiter amplifies on duty with a default value that the value system of this sharp keenization view data will this sharp keenization view data, to amplify the value of this sharp keenization view data.
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| CN200710106385XA CN101316320B (en) | 2007-05-28 | 2007-05-28 | Image processing process for image processing system and correlated image processing apparatus |
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| CN102281387B (en) * | 2010-06-09 | 2013-07-24 | 联咏科技股份有限公司 | Image instantaneous improvement device |
| TWI490818B (en) * | 2013-01-02 | 2015-07-01 | Chunghwa Picture Tubes Ltd | Method and system for weighted image enhancement |
| CN103165100B (en) * | 2013-02-05 | 2014-12-31 | 华映视讯（吴江）有限公司 | Weight type image enhancing method and system |
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| US5682443A (en) * | 1993-03-24 | 1997-10-28 | Crosfield Electronics Limited | Image color modification method and apparatus employing unsharp masking |
| CN1338867A (en) * | 2000-05-31 | 2002-03-06 | 索尼公司 | Signal processor and processing method |
| CN1447585A (en) * | 2002-03-22 | 2003-10-08 | 精工爱普生株式会社 | Image processor and image output appts. |
| CN1507741A (en) * | 2001-03-30 | 2004-06-23 | �´�ӡ�ռ��� | Automated sharpening of images for soft proofing |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682443A (en) * | 1993-03-24 | 1997-10-28 | Crosfield Electronics Limited | Image color modification method and apparatus employing unsharp masking |
| CN1338867A (en) * | 2000-05-31 | 2002-03-06 | 索尼公司 | Signal processor and processing method |
| CN1507741A (en) * | 2001-03-30 | 2004-06-23 | �´�ӡ�ռ��� | Automated sharpening of images for soft proofing |
| CN1447585A (en) * | 2002-03-22 | 2003-10-08 | 精工爱普生株式会社 | Image processor and image output appts. |
Non-Patent Citations (1)
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| JP特开2001-346071A 2001.12.14 |
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