CN101938658B - Picture rate conversion device and method - Google Patents
Picture rate conversion device and method Download PDFInfo
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- CN101938658B CN101938658B CN200910139693.1A CN200910139693A CN101938658B CN 101938658 B CN101938658 B CN 101938658B CN 200910139693 A CN200910139693 A CN 200910139693A CN 101938658 B CN101938658 B CN 101938658B
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Abstract
The invention relates to picture rate conversion device and method. The method comprises the steps of: receiving a plurality of continuously input video pictures; detecting the brightness information of a current picture; generating a first output picture according to the brightness information of the current picture and that of a previous picture prior to the current picture; and generating a second output picture according to the brightness information of the current picture and that of a subsequent picture after the current picture, wherein the second output picture is output after the first output picture.
Description
Technical field
The present invention relates to a kind of sampling rate conversion (FRUC), particularly relate to a kind of device and method with sampling rate conversion of luminance compensation.
Background technology
LCD screen (LCD) is comprised of many pixels.Each pixel can be driven into the pixel value of certain luminance.Yet, because liquid crystal while changing pixel value the delay of response time can to cause the mobile object of LCD Display panel to move fuzzy.Can apply the technology of sampling rate conversion in order to overcome the motion blur phenomenon.Usually, FRUC is the processing of video interpolation in video decoder, can be used for increasing the perception sampling rate of reconstruction video.In addition, FRUC need to carry out locomotion evaluation to find needed motion vector between two pictures, then based on new picture of accurate motion vector interpolation, is worse than between two pictures.Unfortunately, accurately the assessment of motion vector is that difficulty is complicated and expensive.
For addressing the above problem, be necessary to provide a kind of method and device of the LCD of reduction motion blur.
Summary of the invention
The invention provides a kind of method of sampling rate conversion, comprise step: receive a plurality of continuous input video pictures; Detect the monochrome information of a current picture; And produce one first output picture according to the monochrome information of current picture and the previous picture before current picture, and produce one second output picture according to the monochrome information of current picture and the follow-up picture after current picture, wherein after the first output picture, export the second output picture.
The invention provides a kind of sampling rate transducer that receives a plurality of continuous input pictures, comprising: a brightness detector, in order to detect the monochrome information of a current picture; One controller of overdriving, in order to according to the monochrome information generation one first of picture and the previous picture before current picture at present, to export picture, and produce one second output picture according to the monochrome information of current picture and the follow-up picture after current picture, wherein after the first output picture, export the second output picture.The controller of overdriving comprises a compensating circuit and a picture generator.Compensating circuit produces the first adjustment information according to the monochrome information of current picture and a previous picture, and produces the second adjustment information according to the monochrome information of current picture and a follow-up picture.The picture generator produces the first output picture and produces the second output picture according to the second adjustment information according to the first adjustment information.
Above-described sampling rate conversion method and device receive a continuous input video picture to obtain the new continuous videos picture faster than a new sampling rate of inputting sampling rate with an input sampling rate, then with brightness overdrive improve the new video picture response time effectively to reduce motion blur.
The accompanying drawing explanation
Fig. 1 shows based on owing to drive luminosity response and the variation of brightness on time shaft of the luminosity response display pixel of overdriving;
Fig. 2 shows the schematic diagram of the pixel intensity of the output picture compensated according to embodiments of the invention;
Fig. 3 shows continuous input picture that the brightness according to the embodiments of the invention display pixel changes on time shaft and corresponding output picture;
Fig. 4 is the flow chart according to the method for embodiments of the invention explicit declaration sampling rate conversion; And
Fig. 5 shows for carrying out sampling rate transducer of the present invention.
The reference numeral explanation
402,404,406,408,410,412～process step
500～sampling rate transducer
510～locomotion evaluation device
520～edge detector
530～brightness detector
540～the controller of overdriving
542～compensating circuit
544～picture generator
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows:
Fig. 1 shows based on owing to drive luminosity response and the variation of brightness on time shaft of the luminosity response display pixel of overdriving.Brightness in the initial pixel of picture 2 is numerical value S, and the initial desired value T that reaches determined at picture 3.Usually, when pixel is not overdrived, (for example applying voltage V2), is T1 but not desired value T in the brightness of the initial pixel of next picture 3.Numerical value T1 causes motion blur lower than desired value T in follow-up picture.Therefore, for example, when pixel is overdrived (applying voltage V1), in the brightness meeting of the initial pixel of next picture 3, reach desired value T and fuzzy in therefore reducing follow-up picture.
Must notice, over-driving method needs the information of real-time and accurate LCD panel light response characteristic.Over-drive unit determines that according to the characteristic of LCD panel light response the magnitude of voltage applied of pixel intensity is to show the pixel intensity of the upper video pictures of LCD.
Fig. 2 shows the schematic diagram of the pixel intensity of the output picture compensated according to embodiments of the invention.As shown in Figure 2, but the input picture there is apparent size and the sampling rate 1/60 of 800*600.Be positioned at input picture F
n-1, F
nwith F
n+1the pixel P of interior coordinate 100*100
n-1, P
nwith P
n+1there is respectively corresponding brightness value L
n-1, L
nwith L
n+1.Be positioned at input picture F '
nwith F "
nthe pixel P ' of interior coordinate 100*100
nwith P "
nthere is respectively corresponding brightness value L '
nwith L "
n.Pixel P
nchroma information (colourity and saturation) equal pixel P '
nwith P "
nchroma information.In brief, input picture (that is F
n) chroma information equal two corresponding output picture (that is F '
nwith F "
n) chroma information.Between brightness L
nwith L
n-1between the first luminance difference W
l1-50 (L
n-L
n-1), and between brightness L
nwith L
n+1between the first luminance difference W
l240 (L
n-L
n+1).Therefore, brightness L '
nwith L "
nbased on luminance difference W
l1with W
l2respectively 50 and 120.According to above-mentioned, input picture F
naccording to first and second luminance difference W
l1with W
l2produce two corresponding output picture F '
nwith F "
n.In another embodiment, brightness detector detects the input picture.Detect the brightness of each pixel and calculate two and input continuously each corresponding luminance difference between picture.In addition, also consider object of which movement information and edge contrast.Rim detection is identified the edge whether pixel is positioned at the object of input picture.In addition, carry out locomotion evaluation and input continuously the track (that is motion vector) of the mobile object between picture to assess two.According to the pixel intensity in luminance difference, marginal information and movable information compensation output picture.
Fig. 3 shows continuous input picture that the brightness according to the embodiments of the invention display pixel changes on time shaft and corresponding output picture.Input picture F
n-F
n+3interior position is respectively 150,100,60 and 120 in the pixel intensity of coordinate (100,100).After compensate for brightness, output picture F "
n-1, F '
n, F "
n, F '
n+1, F "
n+1with F '
n+2the pixel intensity of coordinate (100,100) be respectively 200,50,120,40,20 and 160.Input picture F
nproduce two corresponding output picture F '
nwith F "
n, wherein two correspondences are exported picture F '
nwith F "
nchroma information be to equal to input picture F
nchroma information.Under the same manner, produce output picture F '
n+2, F "
n+2, F '
n+3with F "
n+3.Number of pictures increases twice, and therefore sampling rate increases twice.Luminance difference between two continuous wave output pictures also can strengthen.
Fig. 4 is the flow chart according to the method for embodiments of the invention explicit declaration sampling rate conversion.In step 402, receive sampling rate at 1/60 continuous input picture.In step 404, detect the monochrome information (luminosity, intensity) of input picture.Produce the first luminance difference information between the monochrome information of current picture and previous picture and produce the second luminance difference information between the monochrome information of current picture and follow-up picture.In step 406, produce the first movable information (motion phase) between current picture and previous picture and produce current picture and follow-up picture between the second movable information (motion phase).In step 408, produce the marginal information of current picture.In step 410, produce the first adjustment information according to the first movable information, marginal information and the first luminance difference information, and produce the second adjustment information according to the second movable information, marginal information and the second luminance difference information.In step 412, produce the first output picture according to the first adjustment information, and produce the second output picture according to the second adjustment information.In addition, produce the monochrome information of first and second output picture by the monochrome information of the current picture of compensation, and the chroma information of first and second output picture equals the chroma information of current picture.
For instance, at Fig. 2, input picture F
n-1with F
nbetween luminance difference be-50.Current picture F
nmarginal information can be detected.Previous picture F
n-1with current picture F
nbetween the first movable information can be detected.Produce the first adjusted value according to the first luminance difference, the first movable information and marginal information.According to first adjusted value compensation the first output picture F '
ninterior pixel P '
nbrightness.Pixel P '
nchroma information equal pixel P
nchroma information.The basis of following pixel based on pixel produces the first output picture F '
n.Under the method, according to the second adjustment information and current picture F
nchroma information also produce the second output picture F "
n.Pixel P '
ncan be via trying to achieve with minor function:
W＝a*(L
n-L
n-1)+b*M+c*E
P′
n＝P
n*(1+d*W)
Wherein symbol M means the first movable information, and symbol E means marginal information, and symbol W means the first adjustment information, and symbol a means corresponding coefficient to d.
Because an input picture produces the output picture of two correspondences according to two adjacent input pictures, the output number of pictures is the twice of input number of pictures.Therefore, the output sampling rate also can increase.Preferably, when the luminance difference of relatively inputting pixel between picture, between adjacent pictures, the luminance difference of pixel can strengthen.Simultaneously, the overdrive voltage of pixel components also can determine and for better brightness.Then, according to video processnig algorithms, apply overdrive voltage to driving hardware (pixel components) to arrive object pixel numerical value, according to new sampling rate, by preceding value, to the brightness transition meeting of each pixel of next desired value, be shown in display unit.
Fig. 5 shows for carrying out sampling rate transducer of the present invention.Sampling rate transducer 500 comprises locomotion evaluation device 510, edge detector 520, brightness detector 530 and the controller 540 of overdriving.The controller 540 of overdriving also comprises picture generator 542 and compensating circuit 544.Locomotion evaluation device 510, edge detector 520, brightness detector 530 and the controller 540 of overdriving receive the input picture.Locomotion evaluation device 510 produces the first movable information (motion vector) between current picture and previous picture, and the second movable information (motion vector) between current picture and follow-up picture.Brightness detector 530 detects the monochrome information (luminosity or intensity) of current picture.Overdrive controller 540 according to the first movable information, marginal information and the monochrome information of picture and previous picture produce the first output picture at present, and produce the second output picture according to the second movable information, marginal information and the monochrome information of current picture and follow-up picture, wherein the second output picture is exported after the first output picture.
The controller 540 of overdriving comprises compensating circuit 542 and picture generator 544.Compensating circuit 542 produces the first adjustment information according to current picture and the first movable information, marginal information and the monochrome information of previous picture, and produces the second adjustment information according to the second movable information, marginal information and the monochrome information of current picture and follow-up picture.In detail, compensating circuit 542 also can only produce the first adjustment information by the different information between the brightness with reference to current picture and previous picture, and.Compensating circuit 542 produces the second adjustment information by the different information between the brightness with reference to current picture and follow-up picture.Picture generator 544 produces the first output picture according to the first adjustment information, and produce the second output picture according to the second adjustment information, wherein by the monochrome information of the current picture of compensation, produce the monochrome information of first and second output picture, and the chroma information (colourity and saturation) of first and second output picture equals the chroma information of current picture.
Determine for example output pixel with Fig. 2.Locomotion evaluation device 510 produces between previous picture F
n-1with current picture F
nbetween the first movable information.Edge detector 520 produces current picture F
nmarginal information.Brightness detector 530 detects respectively previous picture F
n-1with current picture F
ninterior pixel L
n-1with L
n brightness.Compensating circuit 542 is according to the first mobile message, marginal information and pixel L
n-1with L
nbrightness produce the first adjusted value.In addition, compensating circuit 542 reference pixel L
n-1with L
nbrightness between luminance difference W
l1.Picture generator 544 is according to the first adjusted value and pixel P
nchroma information produce output picture F '
ninterior pixel P '
n, then based on pixel, follow pixel operation and produce the first output picture F '
n.In detail, produce pixel P ' according to the first adjusted value
nbrightness, and pixel P '
nchroma information equal pixel P
nchroma information.Therefore, produce the first output picture P '
neach interior pixel.Under the same manner, according to the second adjustment information and current picture F
nchroma information produce the second output picture F "
n.
Because input picture (that is picture F
n) may produce output picture (that is the picture F ' of two correspondences
nwith F "
n), so the number of output picture may increase and sampling rate also can be very fast.In addition, the brightness meeting of the pixel of output in picture is compensated but the chroma information (colourity and saturation) of pixel equals corresponding input picture.For two continuous output pictures, to compare two and input continuously picture, the luminance difference of pixel can strengthen.Therefore, the output picture has sampling rate and the luminance difference information that is different from the input video picture.
Those skilled in the art can realize idea and the specific embodiment that they can use announcement easily and change and design other structure that can implement same purpose and the scope that does not break away from the present invention and claim for basis.
Claims (6)
1. the method for sampling rate conversion comprises step:
Receive a plurality of continuous input video pictures;
Detect the monochrome information of a current picture; And
Produce one first output picture according to the monochrome information of this current picture and the previous picture before this current picture, and produce one second output picture according to the monochrome information of this current picture and the follow-up picture after this current picture, wherein after this first output picture, export this second output picture
This generation step also comprises:
Produce the first movable information between this current picture and this previous picture, and the second movable information between this current picture and this follow-up picture;
Produce the marginal information of this current picture; And
Produce this first output picture according to this first movable information and this marginal information, and produce this second output picture according to this second movable information and this marginal information.
2. the method for sampling rate as claimed in claim 1 conversion, wherein implement the method with the basis that pixel is followed pixel.
3. the method for sampling rate as claimed in claim 1 conversion, wherein produce the monochrome information of this first and second output picture by this monochrome information of compensation, and the chroma information of this first and second output picture equals the chroma information of this current picture.
4. a sampling rate transducer that receives a plurality of continuous input pictures comprises:
One brightness detector, in order to detect the monochrome information of a current picture;
One controller of overdriving, produce one first output picture in order to the monochrome information according to this current picture and the previous picture before this current picture, and produce one second output picture according to the monochrome information of this current picture and the follow-up picture after this current picture, wherein after this first output picture, export this second output picture;
One locomotion evaluation device, in order to produce the first movable information between this current picture and this previous picture, and the second movable information between this current picture and this follow-up picture;
One edge detector, in order to produce the marginal information of this current picture; And
This controller of overdriving, in order to according to this first movable information and this marginal information, to produce this first output picture, and produce this second output picture according to this second movable information and this marginal information.
5. sampling rate transducer as claimed in claim 4, implement on the basis that wherein this device is followed pixel with pixel.
6. sampling rate transducer as claimed in claim 4, wherein produce the monochrome information of this first and second output picture by this monochrome information of compensation, and the chroma information of this first and second output picture equals the chroma information of this current picture.
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| CN200910139693.1A CN101938658B (en) | 2009-07-02 | 2009-07-02 | Picture rate conversion device and method |
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| TWI823550B (en) * | 2022-09-06 | 2023-11-21 | 友達光電股份有限公司 | Image generating device and image generating method |
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|---|---|---|---|---|
| CN1499475A (en) * | 2002-11-08 | 2004-05-26 | 三星电子株式会社 | Response time accelerator for driving LCD device and its method |
| US20060209054A1 (en) * | 2003-02-20 | 2006-09-21 | Ikuo Someya | Image signal processing apparatus and processing method, and image display apparatus using the same |
| CN101145237A (en) * | 2006-09-13 | 2008-03-19 | 叶琦 | Network transmitted digital camera shooting cartoon, cartoon real person show |
| US20080246784A1 (en) * | 2007-04-05 | 2008-10-09 | Hitachi Displays, Ltd. | Display device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1499475A (en) * | 2002-11-08 | 2004-05-26 | 三星电子株式会社 | Response time accelerator for driving LCD device and its method |
| US20060209054A1 (en) * | 2003-02-20 | 2006-09-21 | Ikuo Someya | Image signal processing apparatus and processing method, and image display apparatus using the same |
| CN101145237A (en) * | 2006-09-13 | 2008-03-19 | 叶琦 | Network transmitted digital camera shooting cartoon, cartoon real person show |
| US20080246784A1 (en) * | 2007-04-05 | 2008-10-09 | Hitachi Displays, Ltd. | Display device |
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Effective date of registration: 20221104 Address after: Taiwan Tainan new urban Chinese Fenghua in purple Melia Road No. 26 Patentee after: Himax Technologies, Inc. Address before: Tainan County, Taiwan, China Patentee before: Himax Media Solutions, Inc. |
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