Encoding method and device, and decoding method and device

An encoding method and encoding device technology, applied in the field of decoding method and device, encoding method and device, can solve the problems affecting the overall compression efficiency of image encoding and increasing encoding overhead, so as to reduce encoding overhead, improve overall compression efficiency, and improve coding efficiency. The effect of rate control accuracy
CN102685478BActive Publication Date: 2015-04-29HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2015-04-29

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Abstract

An encoding method and device, a decoding method and device, and an encoding / decoding system are provided. The method includes: obtaining, by an encoder, data to be encoded, where the data to be encoded is at least one LCU; determining, by the encoder, a quantization depth parameter of the LCU according to a preset bit rate control algorithm, and adding the quantization depth parameter into the data to be encoded; determining, by the encoder, a QP of each CU according to a size of a minimum picture block and a size of each CU included in the LCU; calculating, by the encoder, a QP difference of each CU according to the QP of each CU and a QP prediction value of each CU; for each CU that satisfies a preset condition, carrying, by the encoder, the QP difference of the CU in the CU; and encoding, by the encoder, the quantization depth parameter, the QP difference of the CU that satisfies the preset condition, and each CU to obtain a bit stream. A decoding method and an encoding / decoding device are also provided.
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Description

technical field

[0001] The present invention relates to the field of data processing, in particular to an encoding method and device, and a decoding method and device. Background technique

[0002] In the existing video image encoding process, the encoder needs to perform spatial transformation on the original image block data or the predicted image block difference data, quantize the transformation coefficients, and then perform entropy encoding on the quantized coefficients. The decoding end performs an inverse quantization operation on the coefficients obtained by entropy decoding, reconstructs the transformation coefficients, and then performs an inverse transformation operation to obtain the original image block data or image block difference data.

[0003] In order to perform inverse quantization at the decoder, the decoder needs to obtain the quantization step size (QStep) used in the quantization process at the encoder. Therefore, the encoder needs to write the adop...

Claims

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