Coding and decoding method, coder, decoder and encoder/decoder system

Abstract

The embodiment of the invention relates to a coding and decoding method, a coder, a decoder and a coder / decoder system. The coding method comprises: obtaining a predicted value according to an original image or a reconstructed image; performing transform domain processing to the predicted value; performing quantization and inverse quantization to the predicted value after transform domain processing; obtaining a residual error according to the predicted value after inverse quantization and the original image transform domain parameter; obtaining coding data according to the residual error; performing quantization to the residual error; performing inverse quantization to the quantized residual error; obtaining a reconstruction value according to the predicted value and the residual error which both finish inverse quantization processing; and obtaining a reconstruction image after performing inverse transform domain processing to the reconstruction value. The embodiment of the inventionreduces distortion factor, improves R-D performance, improves coding and decoding efficiency and lowers coding and decoding complexity.

Description

technical field [0001] The embodiments of the present invention relate to the field of video transmission, and in particular, to an encoding method, a switching frame encoding method, an auxiliary switching frame encoding method, a decoding method, a switching frame decoding method, an auxiliary switching frame decoding method, an encoder, a decoder, and a codec system. Background technique [0002] At present, in video transmission technology, it is difficult to adapt to the fluctuation of network bandwidth by adopting fixed bit rate for video transmission. A better solution is to pre-store multiple video streams with different bit rates on the server side, and send video streams with corresponding bit rates according to bandwidth fluctuations. In this method, multiple video streams with different bit rates are involved. switching between streams. In fact, the application requirements for code stream switching exist widely, such as: Internet-based streaming media multicast...

AI Technical Summary

Problems solved by technology

This improved coding scheme, due to the removal of the QS module in the prediction loop and the QS -1 module, which makes the prediction more accurate and has fewer residual bits; however, this scheme cannot offset the quantization error, resulting in increased distortion of the SP reconstructed image and the encoded image

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