CN111885335A - Ultrahigh-definition down-conversion rendering method - Google Patents
Ultrahigh-definition down-conversion rendering method Download PDFInfo
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- CN111885335A CN111885335A CN202010564525.3A CN202010564525A CN111885335A CN 111885335 A CN111885335 A CN 111885335A CN 202010564525 A CN202010564525 A CN 202010564525A CN 111885335 A CN111885335 A CN 111885335A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0135—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level involving interpolation processes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
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Abstract
The invention discloses an ultra-high definition down-conversion rendering method, which comprises the following steps: collecting a current frame CurFrame, a previous frame PreFrame and a next frame NextFrame in a source video sequence; selecting a mode, the mode including a frame-to-frame mode, a frame-to-field mode, a field-to-frame mode, and a field-to-field mode; down conversion is performed according to the selected mode. The invention corrects the bottom field and the top field by using a de-interlacing algorithm, performs down-conversion on videos in different modes by using an interpolation algorithm, and performs vertical filtering on down-converted frames, thereby solving the problems of motion picture jitter, picture discontinuity and the like when the ultra-high definition (4 k) is edited in a high-definition mode.
Description
Technical Field
The invention relates to the field of high-definition processing, in particular to an ultrahigh-definition down-conversion rendering method.
Background
The conversion of the high definition to standard definition signal is called down-conversion. A Down Converter (Down Converter) is used. According to the current television standard in China, when a high-definition signal is down-converted to a standard-definition signal, only the line frequency and the aspect ratio need to be converted because the field frequency is unchanged. The process is as follows: firstly, converting a high-definition interlaced scanning signal into a progressive scanning signal, then completing the conversion of pixels by using an interpolation technology, and finally converting the high-definition interlaced scanning signal into an interlaced scanning signal with 576i/50 format through interlacing processing. After down-conversion, the image has better acutance, color saturation and definition, and the picture is more exquisite and soft.
However, in the ultra high definition (4 k) mode, when some special pictures such as relatively thin horizontal or vertical stripes are converted from high definition to standard definition, the phenomena of motion picture jitter, picture discontinuity and the like are often generated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an ultra-high definition down-conversion rendering method.
The invention aims to be realized by the following technical scheme: an ultra-high-definition down-conversion rendering method comprises the following steps:
s1, collecting a current frame CurFrame, a previous frame PreFrame of the current frame and a next frame NextFrame of the current frame in the source video sequence;
s2, selecting modes, wherein the modes comprise a frame-frame mode, a frame-field mode, a field-frame mode and a field-field mode;
s3, down-conversion is performed according to the mode selected in the step S2.
The frame-to-frame mode down-conversion comprises the sub-steps of:
s3011, inputting a CurFrame;
s3012, performing down-conversion on the CurFrame through an interpolation algorithm to obtain a down-converted frame ScaleFrame 1;
s3013, vertically filtering the ScaleFrame1 to obtain a vertically filtered frame FilterFrame 1.
The frame-to-field mode down-conversion includes calculating a top field frame number and calculating a bottom field frame number; wherein, the calculating the top field frame number comprises the following substeps:
s30211, inputting a CurFrame, wherein a TempFrame1 frame actually used for down-conversion is equal to the CurFrame;
s30212, down-converting the TempFrame1 through an interpolation algorithm to obtain a down-converted frame ScaleFrame 2;
s30213, vertically filtering the ScaleFrame2 to obtain a vertically filtered frame FilterFrame2, wherein the FilterFrame2 is a top field;
the calculating the bottom field frame number comprises the following substeps:
s30221, inputting CurFrame and NextFrame, and calculating linear interpolation of the two input frames to obtain a frame TempFrame2 actually used for down-conversion;
s30212, down-converting the TempFrame2 through an interpolation algorithm to obtain a down-converted frame ScaleFrame 3;
s30213, vertically filtering the ScaleFrame3 to obtain a vertically filtered frame FilterFrame3, wherein the FilterFrame3 is a bottom field.
The field-frame mode down-conversion comprises the sub-steps of:
s3031, inputting CurFrame, PreFrame and NextFrame, de-interlacing the CurFrame through a de-interlacing algorithm,
obtaining a deinterlaced progressive frame 1;
s3032, performing down-conversion on the deinterlaced frame progressive frame1 through an interpolation algorithm to obtain a ScaleFrame 4;
s3033, vertically filtering the ScaleFrame4 to obtain a vertically filtered frame FilterFrame 4.
The field-to-field mode down-conversion comprises the sub-steps of:
s3041, inputting the CurFrame, the PreFrame and the NextFrame, and de-interlacing the CurFrame through a de-interlacing algorithm; correcting the bottom field when calculating the top field, and correcting the top field when calculating the bottom field; obtaining a deinterlaced progressive frame 2;
s3042, performing down-conversion on the deinterlaced frame progressive frame2 through an interpolation algorithm to obtain a ScaleFrame 5;
s3043, vertically filtering the ScaleFrame5 to obtain a FilterFrame 5; when the top field is calculated, the result is the top field of the FilterFrame5, and when the bottom field is calculated, the result is the bottom field of the FilterFrame 5.
The invention has the beneficial effects that: the invention corrects the bottom field and the top field by using the de-interlacing algorithm and performs down-conversion on videos in different modes by using the interpolation algorithm, thereby solving the problems of jitter, discontinuous pictures and the like of moving pictures when the ultra-high definition (4 k) is edited in a high-definition mode.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention;
FIG. 2 is a flowchart of the method of step S3 according to the present invention.
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, the embodiments of the present invention will be described with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, an ultra-high definition down-conversion rendering method includes the following steps:
s1, collecting a current frame CurFrame, a previous frame PreFrame of the current frame and a next frame NextFrame of the current frame in the source video sequence;
s2, selecting modes, wherein the modes comprise a frame-frame mode, a frame-field mode, a field-frame mode and a field-field mode;
s3, down-conversion is performed according to the mode selected in the step S2.
As shown in fig. 2, the frame-to-frame mode down-conversion includes the sub-steps of:
s3011, inputting a CurFrame;
s3012, performing down-conversion on the CurFrame through an interpolation algorithm to obtain a down-converted frame ScaleFrame 1;
s3013, vertically filtering the ScaleFrame1 to obtain a vertically filtered frame FilterFrame 1.
The frame-to-field mode down-conversion includes calculating a top field frame number and calculating a bottom field frame number; wherein, the calculating the top field frame number comprises the following substeps:
s30211, inputting a CurFrame, wherein a TempFrame1 frame actually used for down-conversion is equal to the CurFrame;
s30212, down-converting the TempFrame1 through an interpolation algorithm to obtain a down-converted frame ScaleFrame 2;
s30213, vertically filtering the ScaleFrame2 to obtain a vertically filtered frame FilterFrame2, wherein the FilterFrame2 is a top field;
the calculating the bottom field frame number comprises the following substeps:
s30221, inputting CurFrame and NextFrame, and calculating linear interpolation of the two input frames to obtain a frame TempFrame2 actually used for down-conversion;
s30212, down-converting the TempFrame2 through an interpolation algorithm to obtain a down-converted frame ScaleFrame 3;
s30213, vertically filtering the ScaleFrame3 to obtain a vertically filtered frame FilterFrame3, wherein the FilterFrame3 is a bottom field.
The field-frame mode down-conversion comprises the sub-steps of:
s3031, inputting CurFrame, PreFrame and NextFrame, de-interlacing the CurFrame through a de-interlacing algorithm,
obtaining a deinterlaced progressive frame 1;
s3032, performing down-conversion on the deinterlaced frame progressive frame1 through an interpolation algorithm to obtain a ScaleFrame 4;
s3033, vertically filtering the ScaleFrame4 to obtain a vertically filtered frame FilterFrame 4.
The field-to-field mode down-conversion comprises the sub-steps of:
s3041, inputting the CurFrame, the PreFrame and the NextFrame, and de-interlacing the CurFrame through a de-interlacing algorithm; correcting the bottom field when calculating the top field, and correcting the top field when calculating the bottom field; obtaining a deinterlaced progressive frame 2;
s3042, performing down-conversion on the deinterlaced frame progressive frame2 through an interpolation algorithm to obtain a ScaleFrame 5;
s3043, vertically filtering the ScaleFrame5 to obtain a FilterFrame 5; when the top field is calculated, the result is the top field of the FilterFrame5, and when the bottom field is calculated, the result is the bottom field of the FilterFrame 5.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. An ultra-high-definition down-conversion rendering method is characterized by comprising the following steps of:
s1, collecting a current frame CurFrame, a previous frame PreFrame of the current frame and a next frame NextFrame of the current frame in the source video sequence;
s2, selecting modes, wherein the modes comprise a frame-frame mode, a frame-field mode, a field-frame mode and a field-field mode;
s3, down-conversion is performed according to the mode selected in the step S2.
2. The ultra high definition down-conversion rendering method of claim 1, wherein the frame-to-frame mode down-conversion comprises the sub-steps of:
s3011, inputting a CurFrame;
s3012, performing down-conversion on the CurFrame through an interpolation algorithm to obtain a down-converted frame ScaleFrame 1;
s3013, vertically filtering the ScaleFrame1 to obtain a vertically filtered frame FilterFrame 1.
3. The ultra high definition down-conversion rendering method of claim 1, wherein the frame-to-field mode down-conversion comprises calculating a top field frame number and calculating a bottom field frame number; wherein, the calculating the top field frame number comprises the following substeps:
s30211, inputting a CurFrame, wherein a TempFrame1 frame actually used for down-conversion is equal to the CurFrame;
s30212, down-converting the TempFrame1 through an interpolation algorithm to obtain a down-converted frame ScaleFrame 2;
s30213, vertically filtering the ScaleFrame2 to obtain a vertically filtered frame FilterFrame2, wherein the FilterFrame2 is a top field;
the calculating the bottom field frame number comprises the following substeps:
s30221, inputting CurFrame and NextFrame, and calculating linear interpolation of the two input frames to obtain a frame TempFrame2 actually used for down-conversion;
s30212, down-converting the TempFrame2 through an interpolation algorithm to obtain a down-converted frame ScaleFrame 3;
s30213, vertically filtering the ScaleFrame3 to obtain a vertically filtered frame FilterFrame3, wherein the FilterFrame3 is a bottom field.
4. The ultra high definition down-conversion rendering method according to claim 1, wherein the field-frame mode down-conversion includes the sub-steps of:
s3031, inputting CurFrame, PreFrame and NextFrame, de-interlacing the CurFrame through a de-interlacing algorithm,
obtaining a deinterlaced progressive frame 1;
s3032, performing down-conversion on the deinterlaced frame progressive frame1 through an interpolation algorithm to obtain a ScaleFrame 4;
s3033, vertically filtering the ScaleFrame4 to obtain a vertically filtered frame FilterFrame 4.
5. The ultra high definition down-conversion rendering method of claim 1, wherein the field-field mode down-conversion comprises the sub-steps of:
s3041, inputting the CurFrame, the PreFrame and the NextFrame, and de-interlacing the CurFrame through a de-interlacing algorithm; correcting the bottom field when calculating the top field, and correcting the top field when calculating the bottom field; obtaining a deinterlaced progressive frame 2;
s3042, performing down-conversion on the deinterlaced frame progressive frame2 through an interpolation algorithm to obtain a ScaleFrame 5;
s3043, vertically filtering the ScaleFrame5 to obtain a FilterFrame 5; when the top field is calculated, the result is the top field of the FilterFrame5, and when the bottom field is calculated, the result is the bottom field of the FilterFrame 5.
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