CN102523458B - Encoding and decoding method for wireless transmission of high-definition image and video - Google Patents
Encoding and decoding method for wireless transmission of high-definition image and video Download PDFInfo
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Abstract
The invention discloses an encoding and decoding method for wireless transmission of high-definition images and videos. The encoding and decoding method comprises an encoding method and a decoding method. The encoding method comprises the following steps of: firstly adopting a 4:4:4 YCbCr sampling format to take the same sampling resolution to Y, Cb and Cr components, wherein Y component is stored as an original frame; then according to the need, sampling Cb and Cr for n times (n being more than or equal to 2) and storing respectively as an enhanced frame 1, an enhanced frame 2 and an enhanced frame n. During the wireless transmission of the videos, the transmission of the original frame is guaranteed firstly, a time tag is added at the header of the original frame, a decoding end firstly obtains the time tag at the header of a video stream, comparison with a local clock is made to calculate network time delay, the network time delay is fed back to an encoding end and the corresponding enhanced frames are respectively transmitted according to the need. By separating chrominance from luminance and progressively transmitting the chrominance, chrominance components which are insensitive to human eyes in image signals are properly reduced and the problem that the time delay of the transmission of high-definition images in a wireless network is large is effectively solved.
Description
Technical field
The present invention relates to a kind of decoding method that is suitable for high-definition image video wireless transmission.
Background technology
For a long time, the low bandwidth of the big data quantity of image and video and 3G wireless network is a bottleneck of restriction image/video information real-time Transmission.In order to ensure the real-time of image/video transmission, when the general mode adopting, reduce the resolution of image/video, utilize the quality of image/video to reduce the real-time that exchanges image/video wireless transmission for.This method is for some specific environment inapplicable, and such as scene of a crime gathers evidence etc., such as offender's fingerprint, palmmprint, face etc., and the resolution of our General Requirements image is high as much as possible, but lower comparatively speaking for the requirement of image color.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of look to show the score from the video coding-decoding method of, colourity layering and the network bandwidth adaptive by joining day label in primitive frame.The present invention provides a kind of effective solution for high-definition picture realtime video transmission.
For achieving the above object, the present invention adopts following technical proposals:
Be suitable for a decoding method for high-definition image video wireless transmission, comprise Code And Decode two parts, its feature is as follows:
Described coding method comprises following steps:
(1) first image video signal is adopted to the YCbCr sample format of 4:4:4, Y, Cb, Cr are divided and take identical sampling resolution, Y component is preserved as primitive frame;
(2) Cb and Cr are carried out to ZT coding, carrier chrominance signal are decomposed into n layer, respectively as enhancement frame 1, enhancement frame 2 ... enhancement frame n preserves, and wherein n is more than or equal to 2 natural number;
(3) in video wireless transmission process, joining day label in primitive frame, the first primitive frame of the free label of transport tape, the network delay situation of then returning according to decoding end Real-time Feedback, the number of plies of decision transmission enhancement frame;
Described coding/decoding method comprises following steps:
(1) decoding end, according to the time tag receiving in the primitive frame of video image, calculates network delay, and feeds back to coding side, and utilizes primitive frame to restore the luminance component of image, and composition does not have the image/video frame of color component;
(2) enhancement frame of the image sending according to coding side, differentiates and restores respective image enhancement frame;
(3) image/video frame and image enhancement frame are superimposed, synthetic complete video image reassembled frame.
In video wireless transmission process, also according to the number of plies of real-time bandwidth and the corresponding enhancement frame of user's request decision transmission.
The network delay situation that described Real-time Feedback returns refers to when coding joining day label in primitive frame, and first decoding end obtains video flowing head time tag, and by with local clock contrast, computing network time delay, and feed back to coding side.
Described time tag joins head or the centre of primitive frame.
The number of plies n of described enhancement frame is 8.
Described wireless transmission refers to by 3G network to be transmitted.
After the primitive frame of the free label of transport tape, by the decoding end computation delay time, if delay time is less than official hour, transmit primitive frame and enhancement frame 1, and computation delay time again, if delay time is less than official hour, transmit successively primitive frame, enhancement frame 1 to enhancement frame n, until time delay is not less than official hour.
A kind of decoding method that is suitable for high-definition image video wireless transmission that the present invention proposes is encoded brightness and colourity respectively in image/video cataloged procedure, and colourity adopts the mode of hierarchical coding.And for ensureing that decoding end can Real-time Feedback network condition, joining day label in original video frame.In the process of transmission of video, be the real-time of guarantee transmission and the definition of image, first transmitting brightness is main primitive frame, transmit as required corresponding colourity enhancement layer according to network condition and the user's request of feedback on this basis, show the score from the transmission policy of, colourity layering by this look, on the basis of resolution that ensures the video image transmitting, for user provides very large flexibility, user can be according to the quality of the network bandwidth and actual needs adjustment image transmitting.
Decoding method of the present invention is mainly applicable to 3G site inspection and adopts card, emergency command etc., generally resolution and the real-time requirement to some extent of the image/video to transmission in this environment, the definition of network delay and transmission data is two factors of restriction mutually, affects the quality of transmission.
The invention has the beneficial effects as follows, at primitive frame head joining day label, by time tag reaction network time delay situation, and by look being showed the score from the transmission of, colour grading, in suitable reduction picture signal, human eye insensitive chromatic component, effectively solved the larger problem of the transmission delay of high-definition image in wireless network.
Brief description of the drawings
Fig. 1 is frame of video composition of the present invention;
Fig. 2 is frame of video sample mode of the present invention;
Fig. 3 is embodiment of the present invention network condition feedback method.
Embodiment
Below by instantiation, the present invention will be further elaborated, should be noted that following explanation is only in order to explain the present invention, does not limit its content.
As shown in Figure 1, a kind of high-definition on-site that is applicable to is reconnoitred the video coding-decoding method that 3G outdoor scene is transmitted, and comprises Code And Decode two parts, and its feature is as follows:
Described coding method comprises following steps:
(1) first image video signal is adopted to the YCbCr sample format of 4:4:4, Y, Cb, Cr are divided and take identical sampling resolution, Y component is preserved as primitive frame, and Cb, Cr component separately deal with;
(2) as shown in Figure 2, Cb and Cr are carried out to ZT coding, carrier chrominance signal are decomposed into 8 layers, respectively as enhancement frame (colourity enhancement frame) 1, enhancement frame 2 ... enhancement frame 8 is preserved.Too much enhancement frame will increase the complexity of codec; Refer to that in picture coding course, chrominance signal carries out 8 grades of samplings, the color samples signal of every grade is as enhancement layer, and coding is preserved respectively, according to network real time status, increases the sophistication of image color by transmitting corresponding enhancement frame
(3) in video wireless transmission process, for ensureing definition and the real-time of image/video information, ensure first the transmission of primitive frame, and in primitive frame frame head (head) joining day label, what primitive frame comprised is the monochrome information of image, has determined the definition of image.First the primitive frame of the free label of transport tape, the network delay situation of then returning according to decoding end Real-time Feedback, determines the number of plies of transmission enhancement frame to strengthen the color information of image with this.Also according to the number of plies of real-time bandwidth and the corresponding enhancement frame of user's request decision transmission.As shown in Figure 3, treating transmitting image by this method encodes, the carrier chrominance signal of image or frame of video is separated with luminance signal, luminance signal composition primitive frame, carrier chrominance signal is carried out to wavelet coding simultaneously, carrier chrominance signal is divided into 4 enhancement layers, in transmission of video process, first the primitive frame of the free label of transport tape, then the decoder segments computation delay time, if delay time is less than 4s, while transmission, primitive frame and enhancement frame 1, recalculate delay time, if delay time is less than 4s, transmit successively primitive frame, enhancement frame 1 to enhancement frame n, until time delay is not less than 4s.The network delay situation that described Real-time Feedback returns refers to when coding joining day label in primitive frame head, decoding end (receiving terminal) is first obtained video flowing head time tag, decoding end by with local clock contrast, computing network time delay, and feed back to coding side.
First decoding end obtains video flowing head time tag, and in local clock contrast, computing network time delay, and feed back to user and coding side, user can, according to real-time network feedback and needs, be transmitted respectively corresponding enhancement frame, strengthens the color information of image with this.
Described coding/decoding method comprises following steps:
(1) decoding end, according to the time tag receiving in the frame head of primitive frame of video image, calculates network delay, and feeds back to coding transmitting terminal, and utilize primitive frame to restore the luminance component of image, and composition does not have the image/video frame of color component;
(2) enhancement frame of the image sending according to coding section, differentiates and restores respective image enhancement frame;
(3) primitive frame and picture frame are thought stack, synthetic complete video frame image reassembled frame one by one.
This method is that one is separated based on colourity and brightness, the coding and decoding video algorithm of colourity layering energy Real-time Feedback network condition, colourity and brightness are sampled respectively, are encoded, colourity adopts hierarchical coding mode, in transmitting procedure, be to guarantee the resolution of image and the real-time of transmission, first ensure the transmission of the primitive frame of luminance signal composition, then differentiate the corresponding colourity enhancement layer of transmission according to real-time bandwidth and user's request.
Claims (6)
1. be suitable for a decoding method for high-definition image video wireless transmission, comprise Code And Decode two parts, its feature is as follows:
Described coding method comprises following steps:
(1) first image video signal is adopted to the YCbCr sample format of 4:4:4, Y, Cb, Cr component are taked to identical sampling resolution, Y component is preserved as primitive frame;
(2) Cb and Cr component are carried out to ZT coding, carrier chrominance signal are decomposed into n layer, respectively as enhancement frame 1, enhancement frame 2 ... enhancement frame n preserves, and wherein n is more than or equal to 2 natural number;
(3) in video wireless transmission process, joining day label in primitive frame, first the primitive frame of the free label of transport tape, the network delay situation of then returning according to decoding end Real-time Feedback, determine the number of plies of transmission enhancement frame: after the primitive frame of the free label of transport tape, by the decoding end computation delay time, if delay time is less than official hour, transmit primitive frame and enhancement frame 1, and computation delay time again, if delay time is less than official hour, transmit successively primitive frame, enhancement frame 1 to enhancement frame n, until time delay is not less than official hour;
Described coding/decoding method comprises following steps:
(1) decoding end, according to the time tag receiving in the primitive frame of video image, calculates network delay, and feeds back to coding side, and utilizes primitive frame to restore the luminance component of image, and composition does not have the image/video frame of color component;
(2) enhancement frame of the image sending according to coding side, differentiates and restores respective image enhancement frame;
(3) image/video frame and image enhancement frame are superimposed, synthetic complete video image reassembled frame.
2. the decoding method that is suitable for high-definition image video wireless transmission as claimed in claim 1, is characterized in that, in video wireless transmission process, also according to the number of plies of real-time bandwidth and the corresponding enhancement frame of user's request decision transmission.
3. the decoding method that is suitable for high-definition image video wireless transmission as claimed in claim 1, it is characterized in that, the network delay situation that described Real-time Feedback returns refers to when coding joining day label in primitive frame, first decoding end obtains video flowing head time tag, and by contrasting with local clock, computing network time delay, and feed back to coding side.
4. the decoding method that is suitable for high-definition image video wireless transmission as claimed in claim 3, is characterized in that, described time tag joins head or the centre of primitive frame.
5. the decoding method that is suitable for high-definition image video wireless transmission as claimed in claim 1, is characterized in that, the number of plies n of described enhancement frame is 8.
6. the decoding method that is suitable for high-definition image video wireless transmission as claimed in claim 1, is characterized in that, described wireless transmission refers to by 3G network to be transmitted.
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| WO2018018497A1 (en) * | 2016-07-28 | 2018-02-01 | 王晓光 | Strategy method and system for different time delays in video advertisement receiving |
| CN111200693A (en) * | 2018-11-16 | 2020-05-26 | 杭州海康威视系统技术有限公司 | Image data transmission method, device and system |
| CN113422961A (en) * | 2021-07-21 | 2021-09-21 | 杭州当虹科技股份有限公司 | Video encoding method, video decoding method, encoder, and decoder |
| CN115150370B (en) * | 2022-07-05 | 2023-08-01 | 广东魅视科技股份有限公司 | Image processing method |
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