CN111866432B - Non-frame-coding rate conversion method in field mode - Google Patents
Non-frame-coding rate conversion method in field mode Download PDFInfo
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- CN111866432B CN111866432B CN202010564370.3A CN202010564370A CN111866432B CN 111866432 B CN111866432 B CN 111866432B CN 202010564370 A CN202010564370 A CN 202010564370A CN 111866432 B CN111866432 B CN 111866432B
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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
- H04N7/0127—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter
Abstract
The invention discloses a non-frame-coding rate conversion method in a field mode, which comprises the following steps: acquiring frame rate files of a source video and a target video; the nth frame of the target video is calculated. When a non-program is edited in a video, a file is shot by a mobile phone, a camera and an unmanned aerial vehicle, the shot file format comprises 25 frames, 30 frames, 60 frames and the like, and the non-program has low efficiency and unsmooth picture when files with various frame rates are edited. And the conversion efficiency is improved by respectively calculating the top field and the bottom field of the target frame.
Description
Technical Field
The invention relates to the field of high-definition processing, in particular to a non-coding frame rate conversion method in a field mode.
Background
The field concept is originally applied to televisions, which cannot display one frame of image on a screen simultaneously within the refresh time specified by the formula due to overcoming the limitation of signal frequency bandwidth, but can display the image in two half-frames, one image after the other, and the image cannot be seen by naked eyes due to the high refresh speed. The common television adopts an interlaced scanning mode. The interlaced scanning method divides a frame of television picture into two times of scanning of odd field and even field. Sweeping out an odd field consisting of all odd lines of 1, 3, 5, 7 … and the like for the first time, and sweeping out an even field consisting of all even lines of 2, 4, 6, 8 … and the like for the second time; the even field should be the top field and the odd field should be the bottom field. Thus, each image is scanned over two fields and all pixels are scanned.
In the prior art, when a non-edited video is edited, a file is shot by a mobile phone, a file is shot by a video camera, a file is shot by an unmanned aerial vehicle, the shot file formats include 25 frames, 30 frames, 60 frames and the like, and when the non-edited video is edited, the problems of low efficiency, unsmooth picture and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a non-frame-rate conversion method in a field mode.
The invention aims to be realized by the following technical scheme: a non-frame-rate conversion method in field mode includes the following steps:
s1, acquiring frame rate files of the source video and the target video;
s2, converting the nth frame of the target video;
wherein the step S2 includes top field frame rate conversion and bottom field frame rate conversion.
The step S2 of converting the top frame rate of the target frame includes the following sub-steps:
s2011, calculating the sequence numbers of two to-be-referenced fields of the top field, wherein the sequence numbers of the two to-be-referenced fields are marked as RefNo1 and RefNo 2;
s2012, calculating the weight of the RefNo1 field;
s2013, judging whether the RefNo1 field is a bottom field; if yes, executing step S2014, otherwise, executing step S2015;
s2014, converting the RefNo1 field data SrcField1 into a top field to obtain SrcField 1', and calculating a target top field pixel value, wherein the specific calculation formula is as follows:
DstField1=R1*SrcField1’+(1-R1)*SrcField2；
s2015, converting the RefNo2 field data SrcField2 into a top field to obtain SrcField 2', and calculating a target top field pixel value, wherein a specific calculation formula is as follows:
DstField1=R1*SrcField1+(1-R1)*SrcField2’；
wherein the DstField1 represents a target top field pixel value; r1 represents the weight of the RefNo1 field.
The step S2 of converting the bottom field frame rate of the target frame includes the following sub-steps:
s2021, calculating sequence numbers of two field to-be-referenced fields of the bottom field, wherein the sequence numbers of the two field to-be-referenced fields are recorded as RefNo3 and RefNo 4;
s2022, calculating the weight of the RefNo3 field;
s2023, judging whether the RefNo3 field is a bottom field; if yes, go to step S2024, otherwise go to step S2025;
s2024, converting the RefNo4 field data SrcField4 into a bottom field to obtain SrcField 4', and calculating a target bottom field pixel value, wherein the specific calculation formula is as follows:
DstField2=R*SrcField3+(1-R2)*SrcField4’；
s2025, converting the RefNo3 field data SrcField3 into a bottom field to obtain SrcField 3', and calculating a target bottom field pixel value, wherein the specific calculation formula is as follows:
DstField2=R*SrcField3’+(1-R2)*SrcField4；
wherein the DstField2 represents a target bottom field pixel value; r2 represents the weight of the RefNo3 field.
The step S2011 specifically calculates the formula as follows:
RefNo1=floor((2*n-2)*k+1)；
RefNo2=RefNo1+1；
where k represents the frame rate ratio of the target video to the source video.
The specific calculation formula of step S2012 is as follows:
R1=RefNo2-((2*n-2)*k+1)。
the step S2021 specifically calculates the formula as follows:
RefNo3=floor((2*n-1)*k+1)；
RefNo4=RefNo1+1。
the step S2022 specifically calculates the formula as follows:
R2=RefNo4-((2*n-1)*k。
the invention has the beneficial effects that: according to the method, in the process of converting a source video into a target video, a target frame number conversion method in a field mode is provided, and the pixel value of a target frame can be calculated more accurately by calculating the top field and the bottom field of the target frame respectively. And the conversion efficiency is improved by respectively calculating the top field and the bottom field of the target frame to carry out frame rate conversion.
Drawings
FIG. 1 is a block diagram of the process flow of 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.
The specific principle flow of this embodiment is as follows:
referring to fig. 1, a method for non-frame rate conversion in field mode includes the following steps:
s1, acquiring frame rate files of the source video and the target video;
s2, converting the nth frame of the target video;
wherein the step S2 includes top field frame rate conversion and bottom field frame rate conversion.
The step S2 of converting the top frame rate of the target frame includes the following sub-steps:
s2011, calculating the sequence numbers of two to-be-referenced fields of the top field, wherein the sequence numbers of the two to-be-referenced fields are marked as RefNo1 and RefNo 2;
s2012, calculating the weight of the RefNo1 field;
s2013, judging whether the RefNo1 field is a bottom field; if yes, executing step S2014, otherwise, executing step S2015;
s2014, converting the RefNo1 field data SrcField1 into a top field to obtain SrcField 1', and calculating a target top field pixel value, wherein the specific calculation formula is as follows:
DstField1=R1*SrcField1’+(1-R1)*SrcField2；
s2015, converting the RefNo2 field data SrcField2 into a top field to obtain SrcField 2', and calculating a target top field pixel value, wherein a specific calculation formula is as follows:
DstField1=R1*SrcField1+(1-R1)*SrcField2’；
wherein the DstField1 represents a target top field pixel value; r1 represents the weight of the RefNo1 field.
The step S2 of converting the bottom field frame rate of the target frame includes the following sub-steps:
s2021, calculating sequence numbers of two field to-be-referenced fields of the bottom field, wherein the sequence numbers of the two field to-be-referenced fields are recorded as RefNo3 and RefNo 4;
s2022, calculating the weight of the RefNo3 field;
s2023, judging whether the RefNo3 field is a bottom field; if yes, go to step S2024, otherwise go to step S2025;
s2024, converting the RefNo4 field data SrcField4 into a bottom field to obtain SrcField 4', and calculating a target bottom field pixel value, wherein the specific calculation formula is as follows:
DstField2=R*SrcField3+(1-R2)*SrcField4’；
s2025, converting the RefNo3 field data SrcField3 into a bottom field to obtain SrcField 3', and calculating a target bottom field pixel value, wherein the specific calculation formula is as follows:
DstField2=R*SrcField3’+(1-R2)*SrcField4；
wherein the DstField2 represents a target bottom field pixel value; r2 represents the weight of the RefNo3 field.
The step S2011 specifically calculates the formula as follows:
RefNo1=floor((2*n-2)*k+1)；
RefNo2=RefNo1+1；
where k represents the frame rate ratio of the target video to the source video.
The specific calculation formula of step S2012 is as follows:
R1=RefNo2-((2*n-2)*k+1)。
the step S2021 specifically calculates the formula as follows:
RefNo3=floor((2*n-1)*k+1)；
RefNo4=RefNo1+1。
the step S2022 specifically calculates the formula as follows:
R2=RefNo4-((2*n-1)*k。
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 (1)
1. A method for converting a non-frame-coded rate in a field mode, comprising the steps of:
s1, acquiring frame rate files of the source video and the target video;
s2, converting the nth frame of the target video;
wherein the step S2 includes top field frame rate conversion and bottom field frame rate conversion;
the step S2 of converting the top frame rate of the target frame includes the following sub-steps:
s2011, calculating the sequence numbers of two to-be-referenced fields of the top field, wherein the sequence numbers of the two to-be-referenced fields are marked as RefNo1 and RefNo 2;
s2012, calculating the weight of the RefNo1 field;
s2013, judging whether the RefNo1 field is a bottom field; if yes, executing step S2014, otherwise, executing step S2015;
s2014, converting the RefNo1 field data SrcField1 into a top field to obtain SrcField 1', and calculating a target top field pixel value, wherein the specific calculation formula is as follows:
DstField1=R1*SrcField1’+(1-R1)*SrcField2；
s2015, converting the RefNo2 field data SrcField2 into a top field to obtain SrcField 2', and calculating a target top field pixel value, wherein a specific calculation formula is as follows:
DstField1=R1*SrcField1+(1-R1)*SrcField2’；
wherein the DstField1 represents a target top field pixel value; r1 represents the weight of the RefNo1 field;
the step S2 of converting the bottom field frame rate of the target frame includes the following sub-steps:
s2021, calculating sequence numbers of two field to-be-referenced fields of the bottom field, wherein the sequence numbers of the two field to-be-referenced fields are recorded as RefNo3 and RefNo 4;
s2022, calculating the weight of the RefNo3 field;
s2023, judging whether the RefNo3 field is a bottom field; if yes, go to step S2024, otherwise go to step S2025;
s2024, converting the RefNo4 field data SrcField4 into a bottom field to obtain SrcField 4', and calculating a target bottom field pixel value, wherein the specific calculation formula is as follows:
DstField2=R*SrcField3+(1-R2)*SrcField4’；
s2025, converting the RefNo3 field data SrcField3 into a bottom field to obtain SrcField 3', and calculating a target bottom field pixel value, wherein the specific calculation formula is as follows:
DstField2=R*SrcField3’+(1-R2)*SrcField4；
wherein the DstField2 represents a target bottom field pixel value; r2 represents the weight of the RefNo3 field;
the step S2011 specifically calculates the formula as follows:
RefNo1=floor((2*n-2)*k+1)；
RefNo2=RefNo1+1；
wherein k represents the frame rate ratio of the target video to the source video;
the specific calculation formula of step S2012 is as follows:
R1=RefNo2-((2*n-2)*k+1)；
step S2021 specifically calculates the formula as follows:
RefNo3=floor((2*n-1)*k+1)；
RefNo4=RefNo1+1；
step S2022 specifically calculates the formula as follows:
R2=RefNo4-((2*n-1)*k。
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