A video encoding method and device

Abstract

A video encoding method and device, obtaining the first difference of the quantization parameter of the current encoding block in the current image; acquiring the second difference of the quantization parameter of the reference encoding block in the reference image; wherein, the reference encoding block in the reference image The position is the same as the position of the current coding block in the current image, or the reference coding block is the coding block in the reference image pointed to by the motion vector of the current coding block; the coding value is determined according to the first difference and the second difference, and the coding value Encode the codestream corresponding to the current encoding block. By introducing the reference image, the time-domain prediction is introduced into the encoding of the difference of the quantization parameter, and the reference coding block that matches the current coding block can be selected from the reference image as the prediction block of the current coding block, and the quantization parameter of the reference coding block The difference of is used to encode the current coding block, which can reduce the matching error, reduce the coding rate of the difference of the quantization parameter, and improve the coding efficiency of the difference of the quantization parameter.

Description

Technical field[0001]This application relates to the field of video coding technology, and in particular to a video coding method and device.Background technique[0002]Quantization is a core step in video coding today. In the current popular block-based prediction / transform hybrid coding framework of video encoders, the image is divided into blocks for encoding. Each block first performs prediction to obtain a prediction block, and then subtracts the current block to obtain the residual, and performs DCT transformation And quantize to obtain quantized transform coefficients, and finally encode the quantized transform coefficients and mode information into the code stream.[0003]The quantization parameter (QP) is determined by the encoder and compiled into the code stream. In order to save the code rate of the quantization parameter, in the coding standard H.264 and previous coding standards, QP and the previous block in the coding sequence are subtracted by QP to obtain the difference...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing method, the code rate of QP difference is still high, and the efficiency of QP difference coding is low

Images