Pre-decoding method before video coding

Abstract

The invention discloses a pre-decoding method before video coding, which comprises the following steps of: S1, acquiring video original data by using a video input device; S2, preprocessing the original video data acquired in the step S1; S3, performing primary discrete wavelet transform on the single-channel grayscale image obtained in S3, obtaining four sub-bands LL1, LH1, HL1 and HH1, and onlyreserving a low-frequency sub-band LL1; S4, selecting a background initial image b1 of the monitoring area; S5, selecting an optimal background image bi according to the background initial image b1 inthe step S4, calculating a change value ki, ki=fi-bi, and fi is the latest video frame of the low-frequency sub-band LL1 obtained in the step S3; S6, judging whether the latest fi needs to be transmitted to the user side or not according to ki in S5, coding and transmitting the latest ki or fi to the user side when ki is greater than a preset threshold M, or otherwise, repeating S5. By processingand judging the video at first, and then performing code transmission of the video frame, the subsequent video image decoding efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of video surveillance data decoding, in particular to a pre-decoding method before video encoding. Background technique [0002] With the development of digital media technology and computer technology, video signal has become one of the most important ways for people to obtain information in their daily life due to its advantages of intuition and efficiency. It is widely used in various fields, such as mobile communication, network monitoring, Internet TV, etc. [0003] Since the data volume of the video signal is very large, if the video data is stored or transmitted in an uncompressed form, the storage or transmission bandwidth requirement will be huge. Therefore, the video signal is usually compressed and encoded using video coding technology for storage or transmission. video encoding with [0004] The information theory proposed by C.E.Shannon is the theoretical basis, and the purpose is to effective...

AI Technical Summary

Problems solved by technology

[0005] With the improvement of hardware performance and screen resolution, users have increasingly strong demand for high-definition video. There are more and more high-definition videos with resolutions up to 1080P, 4K, 8K, etc., and their bit rates are also very high. Due to the high-definition video decoding needs Huge processor and memory overhead, which brings a huge load to devices with slightly weaker processing capabilities, such as mobile phones and computers with poorer configuration, often causing problems such as playback freezes and mobile phones getting hot

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