Video error blanketing method based on motion vector extrapolation and motion vector search

Abstract

Disclosed is a concealing video frequency error way based on the extrapolating movement vector and the searching the movement vector. When generating the transmitting error, extrapolate right movement vector information according to the movement trend, estimate destroyed image block (8*8 pels) movement vector according to the overlapping area of the extrapolating block and destroyed block, then conceal image error. When exists right information in the destroyed block, can get the best movement vector estimation value by combining the frame matching with the movement vector optimized searching. The method can effectively conceal and recover the destroyed image information even if the whole image is destroyed.

Description

Technical field [0001] The invention belongs to the field of digital video communication, and in particular relates to the error concealment and restoration technology of digital video transmission in low-speed and harsh environments such as public switched telephone network (PSTN) and wireless mobile communication. Background technique [0002] At present, the videophone research under the Public Switched Telephone Network (PSTN) and mobile communication environment is attracting widespread attention at home and abroad. Prediction) and variable length coding (VariableLength Coding) are the core technologies of compression. When the data stream compressed by this type of technology is transmitted in an environment prone to interference, the impact of information loss will rapidly spread in time and space. , resulting in a noticeable drop in video quality and even extremely poor visual effects. At present, there are many error control techniques used to combat the influence ...

AI Technical Summary

Problems solved by technology

Due to the limitation of real-time video transmission, these damaged images cannot be restored by retransmission

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