CN101640036B - Two-dimensional de-interlacing flicker suppression - Google Patents
Two-dimensional de-interlacing flicker suppression Download PDFInfo
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- CN101640036B CN101640036B CN2008101455136A CN200810145513A CN101640036B CN 101640036 B CN101640036 B CN 101640036B CN 2008101455136 A CN2008101455136 A CN 2008101455136A CN 200810145513 A CN200810145513 A CN 200810145513A CN 101640036 B CN101640036 B CN 101640036B
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Abstract
The invention relates to two-dimensional de-interlacing flicker suppression, and discloses a de-interlacing method and a de-interlacing device. The de-interlacing method comprises the following steps of designating each line in the flicker bit frame for representing that whether each line flickers or not; and then generating de-interlacing lines in the current frame by copying adjacent scanning lines according to the active flicker bit of a previous frame.
Description
Technical field
The present invention relates to deinterleave (de-interlacing) technology, the flicker (flicker) that particularly relates to two-dimensional de-interlacing suppresses.
Background technology
Most television broadcasting signal (for example NTSC, PAL, SECOM) shows with strange, bigraph field (field) staggered in regular turn (interlace), and the persistence of vision by the people obtains frame (frame) video to watch.Though the broadcasting of interlace video signal can be saved frequency range, but can reduce vertical resolution and produce line or area flicker (flicker).Vision signal as for computer display then is to use noninterlace (non-interlaced) or progressive (progressive) mode with direct demonstration entire frame.
For interlace video signal being shown on the gradual display (for example computer display), must earlier interlace video signal be converted to noninterlace (deinterleave or progressive) vision signal by deinterleave (de-interlacing or be called line double (line doubling)) technology.After the deinterleave conversion, originally strange, bigraph field can be combined into frame.
The deinterleave conversion of conventional video signals is had living space (spatial) and time (temporal) dual mode.Time conversion is called (inter-field) deinterleave between three-dimensional or figure again, and it uses the pixel of adjacent figure field or scan line to produce new pixel or scan line.Use three-dimensional deinterleave can obtain stable video, but but must use a large amount of buffers to keep in adjacent front and back figure field data.Space conversion is called (intra-field) deinterleave in two dimension or figure again, and it uses pixel in the single figure field or scan line to produce the new pixel or the scan line of this figure field.Use two-dimensional de-interlacing need not use aforementioned a large amount of buffer, but the video behind the deinterleave is stable inadequately, and easily generation is glimmered or is beated, particularly on the horizontal line direction.
The scintillation of Fig. 1 illustration frame.In the drawings, former frame has six lines, and wherein the 3rd line and the 4th line are black, and all the other are white.This former frame after staggered conversion, become frame 1 (that is, Qi Tuchang) and frame 2 (that is, bigraph field).Next, frame 1 and frame 2 are carried out the conversion of (two dimension) deinterleave, it can be shown on the gradual display.For frame 1, the 1st line and the 3rd line are averaged to produce the 2nd line of deinterleave of grey.Similarly, the 3rd line and the 5th line are averaged to produce the 4th line of deinterleave of grey.For frame 2, also obtain the 3rd line of deinterleave of grey, the 5th line.When deinterleave frame 1 and 2 was shown in gradual display, the onlooker can see the black line in the flicker that frame-to-frame jump produced, but not saw two adjacent black lines.
Therefore need the deinterleave technology that proposes a kind of novelty badly, it not only has the simplicity advantage of two-dimensional de-interlacing, and the stable video that can obtain not tool flicker or beat.
Summary of the invention
In view of above-mentioned, one of purpose of the present invention is to propose a kind of two-dimensional de-interlacing method and device, with the stable deinterleave video that obtains not tool flicker or beat.
According to above-mentioned purpose, the invention provides a kind of de-interlacing methods and device.Whether at first, specify the flicker bit to each the bar line in the frame, be flicker in order to represent each bar line.Then, according to the active flicker bit of preceding frame, by duplicating adjacent scanning lines to produce the deinterleave line in present frame.In one embodiment, the brightness value that compares the corresponding pixel groups of adjacent scanning lines in the present frame; When relatively difference during greater than a predetermined threshold value, then the pixel of this position is the flicker pixel; And judge whether the flicker pixel is real (real) flicker pixel.If be judged to be real flicker pixel, then duplicate adjacent scanning lines to produce the deinterleave line in present frame.
Description of drawings
The scintillation of Fig. 1 illustration frame.
Fig. 2 A shows two-dimensional de-interlacing method and the device according to the embodiment of the invention.
The detailed process of Fig. 2 B displayed map 2A square 12.
The detailed process of Fig. 2 C displayed map 2A square 16.
Fig. 3 A shows the simplification example according to the deinterleave process of Fig. 2 A.
The part of present frame among Fig. 3 B illustration Fig. 3 A.
The reference numeral explanation
10 flicker pixel detection
12 real flicker pixels are judged
14 deinterleaves
16 flicker pixels suppress
20 present frame flicker bit buffers
Frame flicker bit buffer before 21
The two-dimensional de-interlacing method and the device of 100 embodiment of the invention
The detailed step of 120-122 square 12 (Fig. 2 A) and composition square
The detailed step of 160-166 square 16 (Fig. 2 A) and composition square
Embodiment
Fig. 2 A shows according to two-dimensional de-interlacing (de-interlacing) method of the embodiment of the invention and installs 100.Each square in the accompanying drawing can be represented a step or a device, and can use hardware mode, software mode or its to make up and implement.Fig. 3 A shows the simplification example according to the deinterleave process of Fig. 2 A.
At first, the scan line of input present frame.With Fig. 3 A is example, and the 1st scan line and the 3rd scan line of input present frame (Qi Tuchang) produce the 2nd line of output deinterleave by this.Then, the 1st scan line and the 3rd scan line are glimmered pixel detection (square 10) with decision flicker pixel.In the present embodiment, make comparisons at the brightness value of the 1st scan line and the 3rd the corresponding pixel groups of scan line.When relatively difference during greater than a predetermined threshold value, then the pixel of this position is the flicker pixel; Otherwise, be non-flicker pixel.
Next, in square 12, further judge to determine whether these flicker pixels serve as real (real) or suitable flicker pixel.In the present embodiment, judge whether be enough to the flow process of Fig. 2 B as real flicker pixel.At first, square 120 carries out spatial continuity (spatialcontinuity) to be inspected, to judge whether the flicker pixel is that the space is continuous in same line.Then, square 122 carries out time proximity (temporalc loseness/similarity) to be inspected, and is bright line whether to have at least one adjacent lines in the frame before judging.With Fig. 3 A is example, and for the 2nd line of present frame, adjacent the 1st line of preceding frame is bright line (because it has initiatively flicker bit " 1 ").Again for example, for the 10th line of present frame, adjacent the 9th line of preceding frame and Sub_clause 11 line are not bright line (because its flicker bit are " 0 ").
Get back to Fig. 2 A, when being judged to be " non-real " flicker pixel (that is, the N path of square 12), then carry out deinterleave according to conventional two-dimensional de-interlacing methods (square 14).For example, use interpolation method (interpolation) that adjacent scanning lines is averaged to produce the deinterleave line.With Fig. 3 A is example, because the 10th line of present frame is judged as " non-real " the flicker pixel, therefore use the conventional two-dimensional de-interlacing methods, will be adjacent the 9th and Sub_clause 11 scan line be averaged with the 10th line of generation deinterleave (that is, line (10)=(line (9)+line (11))/2)).
Continue with reference to figure 2A, when being judged to be " really " during the pixel of glimmering (that is, the Y path of square 12), then carry out deinterleave, the embodiment of its details shown in Fig. 2 C according to flicker pixel inhibition method of the present invention (square 16).In the present embodiment, judge the adjacent active flicker bit of preceding frame and the relative position of present frame scan line with square 160.If the result is " top ", then duplicate the deinterleave line (square 162) of adjacent below scan line as present frame.With Fig. 3 A is example, the 8th line for present frame, because the adjacent active flicker bit of preceding frame is positioned at " top " of the 8th line of present frame, therefore duplicate the deinterleave line (line (8)=line (9)) of adjacent below scan line (that is, adjacent the 9th line) as present frame.If the result of square 160 is " below ", then duplicate the deinterleave line (square 164) of adjacent top scan line as present frame.With Fig. 3 A is example, the 4th line for present frame, because the adjacent active flicker bit of preceding frame is positioned at " below " of the 4th line of present frame, therefore duplicate the deinterleave line (line (4)=line (3)) of adjacent top scan line (that is, adjacent the 3rd line) as present frame.And for example the result of fruit square 160 be the while " top and below ", then duplicates in the present frame deinterleave line (square 166) of the scan line of least close (most non-similar) in the middle of many adjacent scanning lines as present frame.With Fig. 3 A is example, and for the 6th line of present frame, the adjacent active flicker bit of preceding frame is positioned at " top and the below " of the 6th line of present frame.Fig. 3 B shows the part of present frame among illustration Fig. 3 A.In the accompanying drawings, the 7th line of black is least close scan line in the middle of the 5th, the 7th, the 9th line, therefore, duplicates the deinterleave line (line (6)=line (7)) of the 7th scan line of present frame as present frame.
In the one scan line of present frame, if the ratio that the number of the pixel of really glimmering accounts for whole number of pixels is during greater than a default value (for example 25%), then this scan line promptly is judged to be bright line, and being labeled as initiatively flicker bit (for example " 1 "), it can be stored in the present frame flicker bit buffer 20.On the contrary, then be judged to be non-bright line, and be labeled as passive flicker bit (for example " 0 "), be stored in equally in the present frame flicker bit buffer 20.Each scan line of one frame all has the flicker bit of a correspondence.In the method shown in Fig. 2 A and install in 100, present frame flicker bit buffer 20 is in order to storing the flicker bit of present frame scan line (for example strange scan line), and preceding frame flicker bit buffer 21 is then in order to the flicker bit of frame scan line (for example even scan line) before storing.When the deinterleave of present frame is finished each time, the content of present frame flicker bit buffer 20 will cover to preceding frame flicker bit buffer 21, and (reset) present frame flicker bit buffer 20 of then resetting is in order to prepare to store the flicker bit of next frame.
Carry out above-mentioned square 10-16 in regular turn to produce each deinterleave line in regular turn.With respect to the conventional two-dimensional de-interlacing methods, the deinterleave video that the embodiment of the invention produced, it is stable on the whole, and tool does not glimmer and beats, particularly along the horizontal line direction.
The above is preferred embodiment of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the spirit that invention discloses and changes or modify, and all should be included within the claim of the present invention.
Claims (6)
1. de-interlacing methods comprises:
Specify a flicker bit to each the bar line in the frame, in order to represent the flicker of this each bar line; And
According to the active flicker bit of preceding frame, by duplicating adjacent scanning lines producing the deinterleave line in present frame,
Before above-mentioned deinterleave line produces step, also comprise:
The brightness value that compares the corresponding pixel groups of adjacent scanning lines in the present frame;
When relatively difference during greater than a predetermined threshold value, then the pixel of this position is the flicker pixel;
Judge whether this flicker pixel is the pixel of really glimmering; And
When judging that this flicker pixel be real flicker pixel, according to the active flicker bit of preceding frame, by duplicate adjacent scanning lines with generation deinterleave line in present frame,
Wherein above-mentioned real flicker pixel is by following step judge:
Whether this flicker pixel of inspecting in the same line has spatial continuity; And
Whether have at least one adjacent lines before inspecting in the frame and have initiatively flicker bit,
Wherein above-mentioned step of duplicating adjacent scanning lines comprises following steps:
The adjacent flicker bit of present frame is positioned at the top of present frame deinterleave line, before then duplicating in the frame adjacent below scan line as the deinterleave line of present frame;
The adjacent flicker bit of present frame is positioned at the below of present frame deinterleave line, before then duplicating in the frame adjacent top scan line as the deinterleave line of present frame; And
The adjacent flicker bit of present frame is positioned at the top and the below of present frame deinterleave line, then duplicates in the adjacent scanning lines of present frame least close person as the deinterleave line of present frame,
The ratio that accounts for whole number of pixels when number that should real flicker pixel in the line is during greater than a default value, and then Dui Ying flicker bit is set at active.
2. de-interlacing methods as claimed in claim 1 also comprises:
When this flicker pixel is judged as non-real flicker pixel, use interpolation method to produce this deinterleave line.
3. de-interlacing methods as claimed in claim 1 also comprises this flicker that stores each bar line in the frame and is positioned at a buffer.
4. deinterlacing device comprises:
One specified device is in order to specify a flicker bit to each the bar line in the frame, in order to represent the flicker of this each bar line; And
One generation device, it is according to the active flicker bit of preceding frame, by duplicating adjacent scanning lines producing the deinterleave line in present frame,
Before above-mentioned deinterleave line produces, also comprise:
One device is in order to compare the brightness value of the corresponding pixel groups of adjacent scanning lines in the present frame;
One device, when relatively difference during greater than a predetermined threshold value, then the pixel of this position is made as the flicker pixel; And
Whether one device is the pixel of really glimmering in order to judge this flicker pixel, and when judging that this flicker pixel be when really glimmering pixel, generation device is according to the active flicker bit of preceding frame, by duplicate adjacent scanning lines with generation deinterleave line in present frame,
Wherein above-mentioned real flicker pixel is by following step judge:
Whether this flicker pixel of inspecting in the same line has spatial continuity; And
Whether have at least one adjacent lines before inspecting in the frame and have initiatively flicker bit,
Wherein above-mentioned generation device comprises:
One device, when the adjacent flicker bit of present frame is positioned at the top of present frame deinterleave line, in order to adjacent below scan line in the frame before duplicating as the deinterleave line of present frame;
One device, when the adjacent flicker bit of present frame is positioned at the below of present frame deinterleave line, in order to adjacent top scan line in the frame before duplicating as the deinterleave line of present frame; And
One device, when the adjacent flicker bit of present frame is positioned at the top of present frame deinterleave line and below, in order to least close person in the adjacent scanning lines of duplicating present frame as the deinterleave line of present frame,
The ratio that accounts for whole number of pixels when number that should real flicker pixel in the line is during greater than a default value, and then Dui Ying flicker bit is set at active.
5. deinterlacing device as claimed in claim 4 also comprises:
One device, when this flicker pixel was judged as non-real flicker pixel, the use interpolation method was to produce this deinterleave line.
6. deinterlacing device as claimed in claim 4 also comprises a buffer, in order to store this flicker bit of each bar line in the frame.
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| CN2008101455136A CN101640036B (en) | 2008-08-01 | 2008-08-01 | Two-dimensional de-interlacing flicker suppression |
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| CN2008101455136A CN101640036B (en) | 2008-08-01 | 2008-08-01 | Two-dimensional de-interlacing flicker suppression |
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| CN101640036B true CN101640036B (en) | 2011-08-24 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678025A (en) * | 2004-04-02 | 2005-10-05 | 晨星半导体股份有限公司 | Method of processing video fields and related fields similarity detection apparatus |
| CN1713713A (en) * | 2004-06-15 | 2005-12-28 | 三星电子株式会社 | Deinterlacing apparatus and method using detected judder |
| CN1889673A (en) * | 2006-06-12 | 2007-01-03 | 北京中星微电子有限公司 | Motion detecting and uninterlacing method for digital video frequency processing and apparatus thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1678025A (en) * | 2004-04-02 | 2005-10-05 | 晨星半导体股份有限公司 | Method of processing video fields and related fields similarity detection apparatus |
| CN1713713A (en) * | 2004-06-15 | 2005-12-28 | 三星电子株式会社 | Deinterlacing apparatus and method using detected judder |
| CN1889673A (en) * | 2006-06-12 | 2007-01-03 | 北京中星微电子有限公司 | Motion detecting and uninterlacing method for digital video frequency processing and apparatus thereof |
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