CN1932752A - Image data dithering method and apparatus - Google Patents
Image data dithering method and apparatus Download PDFInfo
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- CN1932752A CN1932752A CN 200610150414 CN200610150414A CN1932752A CN 1932752 A CN1932752 A CN 1932752A CN 200610150414 CN200610150414 CN 200610150414 CN 200610150414 A CN200610150414 A CN 200610150414A CN 1932752 A CN1932752 A CN 1932752A
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Abstract
This invention discloses a whipping method and device used for video data. Firstly provide two different weight numbers and estimate order of the current frame. Secondly, choose one of the numbers as a valid number. Next, compare the lowest significant and the valid weight of the input data and then regulate at least one top significant of the input data. This invention resolves the problem of distortion in traditional technique.
Description
Technical field
The invention relates to a kind of image treatment method and device, particularly about a kind of image data dithering (dithering) method and apparatus that is used for flat-panel screens.
Background technology
Portable apparatus such as mobile computer has flat-type display usually, for example LCD (liquid crystal display, LCD).Shown in Figure 1A, the image data of conventional liquid crystal 10 receiving computer drawing interface cards 12 outputs also is converted to vision signal, to show the significant presentation content of user.The image data form of computer graphics interface card 12 outputs is generally 24, and promptly each represents red (R), green (G) and blue (B) three kinds of basic colors with 8 numerical data to meaning.Yet the LCD 10 acceptable image data forms of most mobile computers but are 18, and promptly each represents red, blue and green three kinds of basic colors with 6 numerical data to meaning.So must doing suitable conversion through converter 14, the image output data of mobile computer drawing interface card 12 could be accepted by LCD 10.
The most direct mode of digital image data that 24 original figure image datas is converted to 16 promptly is that two least significant bit (LSB)s (least significantbits) of each basic colors are directly cast out or abridge (truncated).Directly cast out the resolution of two least significant bit (LSB)s meaning sacrificial section, this will make some presentation content cause the perceptible distortion phenomenon of human eye, and for example picture is discontinuous, and has reduced the image display quality of LCD.In order to remedy the problem of dtmf distortion DTMF of these images, can use the image treatment method of shake (dithering) technology to promote the vision quality of image.Dither technique utilizes dynamically carry or cast out attempting the making average color intensity (colorintensities) of raw video be maintained of least significant bit (LSB), and reduces above-mentioned perceptible image distortion problem.The meaning color intensity of directly casting out of least significant bit (LSB) unconditionally is lowered, and dither technique makes preceding 6 one's carries of some pixel, to remedy brightness or the color intensity of casting out bit-loss.
Figure 1B shows the employed jitter mode of a kind of traditional dither method (ditheringpattern) array synoptic diagram, wherein be positioned at the horizontal coordinate (X) and the vertical coordinate (Y) of the outer numeral image data of array, the numeral in the array is then represented the flexible strategy (weighting) of dithering process institute foundation.Illustrated dither method with the digital image data in arbitrary frame (frame) picture correspond to a plurality of in the horizontal direction with 2 * 2 all continuous jitter mode arrays 30 of vertical direction.Figure 1B only shows corresponding to pairing four 2 * 2 jitter mode arrays 30 of 4 * 4 pixels (pixel) of coordinate figure minimum in the whole digital image data frame, then repeats corresponding identical jitter mode array 30 for other location of pixels in the same frame.The actual coordinate of each unit all corresponds to the locus of representing a pixel in the jitter mode array 30, and the numeral in each unit is to be flexible strategy, and its two least significant bit (LSB)s of color component in order to the decision respective pixel are will directly cast out or want carry actually.As previously mentioned, each color component is all represented with 8 bit digital data.In the flexible strategy that include more than or equal to corresponding array element when two least significant bit (LSB)s of pixel color composition, the output after the dithering process is that preceding 6 positions for the original pixels color component add 1, and meaning is a carry; In the flexible strategy that include less than corresponding array element when two least significant bit (LSB)s of pixel color composition, preceding 6 positions of original pixels color component are kept in the output after the dithering process, and meaning is promptly directly cast out two least significant bit (LSB)s.
Below illustrate with BIT[b:a] represent that a is individual to the individual numerical value of a representative continuously of b in the byte (byte).For example, BIT[1:0] numerical value of 1 position, the 0th position to the (meaning is two least significant bit (LSB)s in the byte) representative in the expression byte; BIT[7:2] then represent the numerical value of 7 the position representatives in the 2nd position to the in the byte.As illustrated in Figure 1B, the flexible strategy of coordinate (0,0) are 0, so the pixel color composition of coordinate (0,0) just is output as BIT[7:2 after the dithering process with unconditional carry]+1.The flexible strategy of coordinate (1,0) are 3, so if two least significant bit (LSB) BIT[1:0 of the pixel color composition of coordinate (1,0)] more than or equal to 3, then be output as BIT[7:2 after the dithering process]+1, otherwise output BIT[7:2].The rest may be inferred in the processing of other coordinate pixel color compositions.
Though above-mentioned traditional dither method has improved the problem of dtmf distortion DTMF after the image data conversion, but the average color intensity after the dithering process still with original average color intensity difference to some extent, and have fixing distortion phenomenon for some presentation content.In view of the disappearance of above-mentioned conventional art, be necessary to propose a kind of dither method and device thereof of improvement, keep and solve fixing distortion phenomenon with what promote the picture average color intensity.
Summary of the invention
For solving the aforementioned problems in the prior, the present invention proposes a kind of dither method and device of improvement, and it has preferable picture average color intensity and keeps effect, in order to solve the fixedly distortion phenomenon of conventional art.
In view of the above, the present invention proposes a kind of image data dithering method.At least two different flexible strategy (weighting) at first are provided, and judge the ordinal characteristics of present frame.Then,, select one of them flexible strategy, with as effective flexible strategy according to this ordinal characteristics.Compare at least one least significant bit (LSB) (LSB) and effective flexible strategy of image input data, again according to result relatively, at least one highest significant position (MSB) of image being imported data adjusts.
Image data dithering method of the present invention, the above-mentioned flexible strategy that provide comprise two flexible strategy ordered series of numbers, correspond to two different jitter mode arrays respectively.
Image data dithering method of the present invention, one of above-mentioned jitter mode array are that the content by another jitter mode array obtains via the center mirror.
Image data dithering method of the present invention, the ordinal characteristics of above-mentioned frame are to represent odd-numbered frame, even frame.
Image data dithering method of the present invention, above-mentioned odd-numbered frame, even frame are to judge according to the video vertical synchronizing signal.
Image data dithering method of the present invention, above-mentioned relatively reaches in the set-up procedure, when the least significant bit (LSB) of this image input data during greater than these effective flexible strategy, then produces a carry digit.
Image data dithering method of the present invention, above-mentioned relatively reaches in the set-up procedure, when the least significant bit (LSB) of this image input data during greater than these effective flexible strategy, then this carry digit is added to the highest significant position of these image input data, to carry out the carry adjustment.
Propose a kind of image data dithering device in addition according to the present invention, it comprises selects element, comparing element and position to adjust element.Select element according to the ordinal characteristics of present frame select at least two different flexible strategy one of them, with as effective flexible strategy.Comparing element is at least one least significant bit (LSB) and effective flexible strategy of image input data relatively.The comparative result of element according to comparing element adjusted in the position, and at least one highest significant position of image being imported data adjusts.
Image data dithering device of the present invention more comprises: at least two programmable register, in order to produce and to store this at least two different flexible strategy respectively; One odd even decision element, its according to the video vertical synchronizing signal to judge the ordinal characteristics of above-mentioned frame; And a resolution element, be divided into this least significant bit (LSB) and this highest significant position two parts in order to position with this image input signal.
Image data dithering device of the present invention, above-mentioned odd even decision element are a counter or a trigger.
Image data dithering device of the present invention, the ordinal characteristics of above-mentioned frame are to represent odd-numbered frame, even frame.
Image data dithering device of the present invention, at least two above-mentioned different flexible strategy comprise two flexible strategy ordered series of numbers, correspond to two different jitter mode arrays respectively, and inputing to this selection element respectively, one of wherein above-mentioned jitter mode array is that the content by another jitter mode array obtains via the center mirror.
Image data dithering device of the present invention, above-mentioned comparing element are imported this least significant bit (LSB) and this effective flexible strategy of this image input data, and this least significant bit (LSB) of importing data when this image then produces a carry digit during greater than these effective flexible strategy.
Image data dithering device of the present invention, above-mentioned position are adjusted this highest significant position and this carry digit that element is imported these image input data, in order to this carry digit is added to this highest significant position of these image input data.
Image data dithering device of the present invention, it is a totalizer that element is adjusted in above-mentioned position.
Image data dithering method of the present invention and device, it has preferable picture average color intensity and keeps effect, has solved the fixedly distortion phenomenon of conventional art.
Description of drawings
The system block diagrams of Figure 1A shows conventional liquid crystal, computer graphics interface card, and between converter;
Figure 1B shows the synoptic diagram of the employed jitter mode array of traditional dither method;
The jittering device of the system block diagrams demonstration embodiment of the invention of Fig. 2 reaches the relation with drawing interface card, display;
The employed jitter mode flexible strategy of the jittering device array of Fig. 3 A and Fig. 3 B displayed map 2;
The thin portion calcspar of the jittering device of Fig. 4 displayed map 2;
Fig. 5 then shows the process flow diagram with the corresponding dither method of Fig. 4.
Embodiment
The system block diagrams of Fig. 2 shows shake (dithering) device 100 of the embodiment of the invention, it receives the image input data DI of drawing interface card 102, then image is imported data DI carry out dithering process according to the ordinal characteristics difference (for example according to video vertical synchronizing signal (verticalsynchronous signal) VSYNC) of frame (frame), the image output data DO that is produced then exports display 104 (for example LCD) to, in order to keeping of enhancement display frame average color intensity, and solve conventional display device, the fixedly distortion phenomenon of method.In present embodiment graphic, though jittering device 100 is to separate each other with drawing interface card 102, display 104, yet in other embodiments, jittering device 100 can be located in the display 104, also can be located in other parts of drawing interface card 102 or computing machine.
One of feature of the embodiment of the invention is according to the order of frame and the employed jitter mode of dynamic change, is dynamically kept the average color composition intensity of the neighbor in the jitter mode array scope whereby.In the present embodiment, the identification of odd-numbered frame and even frame, judgement are by differentiating the video vertical synchronizing signal, perhaps using a counter or trigger to write down the odd number or the even number of frame.In addition, (run-time) produced, stores when the content of jitter mode array (300A, 300B) then can in advance or be moved, and for example can utilize programmable register (programmable register) to obtain the content of jitter mode array immediately.Dithering process method and device thereof about the embodiment of the invention will be described in detail in beneath cooperation is graphic.
The thin portion calcspar of the jittering device 100 of Fig. 4 displayed map 2, each shown square can be hardware circuit, also can be software program, perhaps its combination.Fig. 5 then shows the process flow diagram with the corresponding dither method of Fig. 4, and the order shown in each square step is not necessarily represented its sequence of movement, and some step can be carried out simultaneously.Jittering device 100 comprises the multiplex (MUX) and selects element 110, odd even decision element 120, first programmable register 121, second programmable register 122, comparing element 130, position resolution element 140 and carry element 150.When using, can use a plurality of (for example four) jittering device 100 as shown in the figure, handle four image datas in 2 * 2 jitter mode arrays (300A, 300B) simultaneously in the mode of parallel (parallel), to promote treatment efficiency.Certainly, also can only use single jittering device 100, handle four image datas in 2 * 2 jitter mode arrays (300A, 300B) in regular turn in serial (serial) mode.
At first, provide two different flexible strategy (step 200).In the present embodiment, be to produce and store the first flexible strategy data W D1, the second flexible strategy data W D2 respectively by first programmable register 121, second programmable register 122, it corresponds to the interior flexible strategy of jitter mode array element of aforementioned odd-numbered frame and even frame again respectively.With Fig. 3 A and Fig. 3 B is example, if the content of first programmable register 121 be respectively 0,1,2, during 3}, second programmable register 122 should be respectively 1,0,3,2}.In this embodiment, first programmable register 121 and second programmable register, 122 stored flexible strategy differences each other just equal 1, so not as limit.In other embodiments, if the first flexible strategy data W D1, the second flexible strategy data W D2 are that when moving (run-time) produced by outside or inner member, then can omit first programmable register 121, second programmable register 122.
Then, judge the ordinal characteristics (step 202) of present frame.In the present embodiment, be to produce frame odd even decision signal ODD_EVEN according to video vertical synchronizing signal VSYNC by odd even decision element 120 (for example a counter or a trigger).For example, representing to be odd-numbered frame at present when the least significant bit (LSB) of counter output is 0, is then to represent to be at present even frame at 1 o'clock.In the present embodiment, odd even decision signal ODD_EVEN exports strange, the even signal of representative in regular turn, so not as limit.For example, order output that also can be strange, strange, even, even.
In step 204, select effectively flexible strategy AWD of one of them conduct of flexible strategy WD1, WD2 according to ordinal characteristics.In the present embodiment, the multiplex (MUX) select element 110 (for example two to one multiplexers) according to frame odd even decision signal ODD_EVEN select two the first flexible strategy data W D1, the second flexible strategy data W D2 one of them, thereby export effective flexible strategy AWD of one two.In detail, when frame odd even decision signal ODD_EVEN was 0, the multiplex (MUX) selected element 110 to select the effective flexible strategy AWD of the first flexible strategy data W D1 as output; When frame odd even decision signal ODD_EVEN was 1, the multiplex (MUX) selected element 110 to select the effective flexible strategy AWD of the second flexible strategy data W D2 as output.
In step 206, part least significant bit (LSB) (leastsignificant bits) LSB2 that image is imported data DI makes comparisons with effective flexible strategy AWD.In the present embodiment, earlier 8 image is imported data DI with position resolution element 140 and be divided into two least significant bit (LSB) LSB2 and six highest significant positions (most significant bits) MSB6.In other embodiments, be not limited to it is divided into two and six.Position resolution element 140 in graphic is only illustrated its function at this, in fact can omit a resolution element 140, and directly each bit line is connected to the input end of corresponding element (130,150).Then, comparing element 130 (for example comparer) receives from the multiplex (MUX) and selects effective flexible strategy AWD of element 110 to compare with the two least significant bit (LSB) LSB2 that separate self imaging input data DI and to the two.
After comparison, if two least significant bit (LSB) LSB2 then export a carry signal CARRY more than or equal to effective flexible strategy AWD.Carry element 150 is not when receiving carry signal CARRY, and its output image signal DO equals six original highest significant position MSB6.Otherwise if carry element 150 is when receiving carry signal CARRY, then its output image signal DO equals the value after the six highest significant position MSB6 carries, also is MSB6+1 (step 208).Above-mentioned carry element 150 can be totalizer.In the present embodiment, when two least significant bit (LSB) LSB2 more than or equal to effective flexible strategy AWD, then six highest significant position MSB6 are carried out the carry adjustment; In other embodiments, also can adopt the adjustment of giving up the throne; Moreover the adjusted value of carry/give up the throne is not defined as 1 yet.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
10: LCD
12: the computer graphics interface card
14: converter
30: the jitter mode array
100: jittering device
102: the drawing interface card
104: display
110: the multiplex (MUX) selects element
120: the odd even decision element
121: the first programmable register
122: the second programmable register
130: comparing element
140: the position resolution element
150: the carry element
200-208: the step of dither method
300A: jitter mode array
300B: the jitter mode array behind the mirror of center
ODD_EVEN: frame odd even decision signal
WD1: the first flexible strategy data
WD2: the second flexible strategy data
AWD: effective flexible strategy
DI: image input data
DO: output image signal
LSB2: two least significant bit (LSB)s of image input data
MSB6: six highest significant positions of image input data
CARRY: carry signal
X: image data horizontal axis
Y: image data vertical coordinate axle
Claims (15)
1. an image data dithering method is characterized in that, this image data dithering method comprises:
At least two different flexible strategy are provided;
Judge the ordinal characteristics of present frame;
According to this ordinal characteristics, select these flexible strategy one of them, with as effective flexible strategy;
Relatively image is imported at least one least significant bit (LSB) and these effective flexible strategy of data; And
According to this result relatively, at least one highest significant position of this image being imported data adjusts.
2. image data dithering method according to claim 1 is characterized in that the above-mentioned flexible strategy that provide comprise two flexible strategy ordered series of numbers, corresponds to two different jitter mode arrays respectively.
3. image data dithering method according to claim 2 is characterized in that, one of above-mentioned jitter mode array is that the content by another jitter mode array obtains via the center mirror.
4. image data dithering method according to claim 1 is characterized in that, the ordinal characteristics of above-mentioned frame is to represent odd-numbered frame, even frame.
5. image data dithering method according to claim 4 is characterized in that, above-mentioned odd-numbered frame, even frame are to judge according to the video vertical synchronizing signal.
6. image data dithering method according to claim 1 is characterized in that, above-mentioned relatively reaches in the set-up procedure, when the least significant bit (LSB) of this image input data during greater than these effective flexible strategy, then produces a carry digit.
7. image data dithering method according to claim 6, it is characterized in that above-mentioned relatively reaches in the set-up procedure, when the least significant bit (LSB) of this image input data during greater than these effective flexible strategy, then this carry digit is added to the highest significant position of these image input data, to carry out the carry adjustment.
8. an image data dithering device is characterized in that, this image data dithering device comprises:
One selects element, according to the ordinal characteristics of present frame, select at least two different flexible strategy one of them, with as effective flexible strategy;
One comparing element is in order to compare at least one least significant bit (LSB) and these effective flexible strategy of image input data; And
Adjust element for one, according to the comparative result of this comparing element, at least one highest significant position of this image being imported data adjusts.
9. image data dithering device according to claim 8 is characterized in that, more comprises:
At least two programmable register are in order to produce and to store this at least two different flexible strategy respectively;
One odd even decision element, its according to the video vertical synchronizing signal to judge the ordinal characteristics of above-mentioned frame; And
A resolution element is divided into this least significant bit (LSB) and this highest significant position two parts in order to the position with this image input signal.
10. image data dithering device according to claim 9 is characterized in that, above-mentioned odd even decision element is a counter or a trigger.
11. image data dithering device according to claim 8 is characterized in that, the ordinal characteristics of above-mentioned frame is to represent odd-numbered frame, even frame.
12. image data dithering device according to claim 8, it is characterized in that, above-mentioned flexible strategy comprise two flexible strategy ordered series of numbers, correspond to two different jitter mode arrays respectively, and inputing to this selection element respectively, one of wherein above-mentioned jitter mode array is that the content by another jitter mode array obtains via the center mirror.
13. image data dithering device according to claim 8, it is characterized in that, above-mentioned comparing element is imported this least significant bit (LSB) and this effective flexible strategy of this image input data, and this least significant bit (LSB) of importing data when this image then produces a carry digit during greater than these effective flexible strategy.
14. image data dithering device according to claim 13 is characterized in that, this highest significant position and this carry digit that element is imported these image input data adjusted in above-mentioned position, in order to this carry digit is added to this highest significant position of these image input data.
15. image data dithering device according to claim 8 is characterized in that, it is a totalizer that element is adjusted in above-mentioned position.
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| CNB2006101504148A CN100435087C (en) | 2006-10-25 | 2006-10-25 | Image data dithering method and apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240672A (en) * | 2014-09-12 | 2014-12-24 | 京东方科技集团股份有限公司 | Video processing device and method |
| CN104795047A (en) * | 2015-05-18 | 2015-07-22 | 彩优微电子(昆山)有限公司 | Time and space color mixing method for pixel array |
| CN106162130A (en) * | 2015-04-15 | 2016-11-23 | 深圳市中兴微电子技术有限公司 | A kind of image processing method and device, terminal |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6650337B2 (en) * | 2000-03-28 | 2003-11-18 | Silicon Graphics, Inc. | Increasing color accuracy |
| EP1262942A1 (en) * | 2001-06-01 | 2002-12-04 | Deutsche Thomson-Brandt Gmbh | Method and apparatus for processing video data for a display device |
| US6771242B2 (en) * | 2001-06-11 | 2004-08-03 | Lg. Philips Lcd Co., Ltd. | Method and apparatus for driving liquid crystal display |
| KR100484182B1 (en) * | 2002-12-03 | 2005-04-20 | 삼성전자주식회사 | Apparatus and method for deinterlacing |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104240672A (en) * | 2014-09-12 | 2014-12-24 | 京东方科技集团股份有限公司 | Video processing device and method |
| US9697795B2 (en) | 2014-09-12 | 2017-07-04 | Boe Technology Group Co., Ltd. | Video processing device and method |
| CN106162130A (en) * | 2015-04-15 | 2016-11-23 | 深圳市中兴微电子技术有限公司 | A kind of image processing method and device, terminal |
| CN106162130B (en) * | 2015-04-15 | 2018-06-05 | 深圳市中兴微电子技术有限公司 | A kind of image processing method and device, terminal |
| CN104795047A (en) * | 2015-05-18 | 2015-07-22 | 彩优微电子(昆山)有限公司 | Time and space color mixing method for pixel array |
| CN104795047B (en) * | 2015-05-18 | 2017-08-11 | 彩优微电子(昆山)有限公司 | The time of pel array and spacing color mixed method |
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