Entropy coding method and decoding method based on text

A context and entropy coding technology, applied in the field of entropy coding, can solve the problems of low coding efficiency, not fully utilizing the statistical probability of source symbols, and achieve the effect of reducing redundancy and improving compression performance.

A context and entropy coding technology, applied in the field of entropy coding, can solve the problems of low coding efficiency, not fully utilizing the statistical probability of source symbols, and achieve the effect of reducing redundancy and improving compression performance.

CN1980395AInactive Publication Date: 2007-06-13联合信源数字音视频技术(北京)有限公司
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  • Entropy coding method and decoding method based on text
  • Entropy coding method and decoding method based on text
  • Entropy coding method and decoding method based on text

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Embodiment Construction

[0033] The method of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] Through the stages of predictive coding and transform coding in video coding, the original image is converted into a DCT coefficient block, and the method of the present invention is to perform further operations on the DCT coefficient block.

[0035] As shown in Figure 1, suppose there is an 8×8 DCT coefficient block, which is a brightness block of a bidirectional inter-frame coded image, represented by B_Luma, and there are 64 coefficients in this coefficient block, including zero coefficients and non-zero coefficients . As shown in FIG. 3 , the encoding process of the DCT coefficient block will be described below in conjunction with the context-based adaptive entropy encoding method of the present invention.

[0036] Step 11: Scan the DCT coefficient block according to the scanning order to obtain the last non-zero coef...

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Abstract

The method includes following steps: scanning DCT coefficient blocks according to sequence so as to obtain last one nonzero coefficient (NC) and the coefficient in front of the last one NC in coefficient block, and number value of NC; based on the number value of NC to calculate difference value between number value of NC in this block and number value of NC in adjacent block, and constructing context model for number value of NC; calculating flag bit of NC for last one NC and coefficients before the last one NC; selecting context model to encode flag bit of NC; subtracting 1 from absolute value of NC according to scanning sequence or scanning inverted sequence; and selecting context model to encode number value of NC, and its position in the scan etc; encoding sign bit. The invention also discloses corresponding decoding method.

Description

technical field [0001] The invention relates to a context modeling method for DCT coefficient adaptive arithmetic entropy coding in signal compression, and provides a new coding / decoding system, which is suitable for various image / video / audio DCT in the field of signal processing Entropy encoding of transformed data. Background technique [0002] Video coding technology is a key technology for applications such as digital media storage and transmission. The core technologies in the video coding system include predictive coding, transform coding, and entropy coding. Among them, the entropy coding technology is to perform information entropy coding on the syntactic elements generated in the coding process, such as motion vector (mv), macroblock coding template (cbp), block prediction residual coefficient, etc., and its function is to remove statistical redundancy of data . [0003] The current video coding standard encoding methods for block prediction residual coefficients...

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Application Information

Patent Timeline
13 Jun 2007
Publication
CN1980395A
IPC
H04N7/50; H04N19/13; H04N19/61
Inventors
高文; 张莉