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A high compression ratio portrait coding-decoding method

A technology with high compression ratio and coding method, applied in image coding, image data processing, instruments, etc., can solve problems such as poor practicability and inconvenient application

Inactive Publication Date: 2006-07-19
闫宇松
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, it usually needs to pre-store a large number of training codebooks, which is very inconvenient to apply and relatively poor in practicability.

Method used

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  • A high compression ratio portrait coding-decoding method
  • A high compression ratio portrait coding-decoding method
  • A high compression ratio portrait coding-decoding method

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Embodiment Construction

[0068] The high compression ratio portrait encoding method that the present invention proposes, its flow process is as follows figure 1 As shown, firstly, the shape information and texture information of the human shoulder object are obtained from the color face image to be compressed; the shape information of the human shoulder object is chain-coded, and the symbol stream of the shape information of the human shoulder object is obtained, and arithmetic coding is performed; In the color face image, the background area other than the shoulder object is interpolated and coded to obtain the symbol flow of the background image area, and arithmetic coding is performed; the color face image to be compressed is transformed from the red, green, blue, or RGB space to the luminance, chrominance and chrominance That is, the YUV space, to obtain the face image in the YUV space; according to the human shoulder object, the shape information and texture information of the human shoulder objec...

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Abstract

The invention relates to a high compression ratio human image coding method, which belongs to the image compression technique area. First acquire the shape and texture information of the human shoulder object from the image. Make the chain coding to the shape information and the arithmetic coding to the symbol stream obtained by interpolated coding to the background area. Process the color spacing transformation to the face image and the wavelet transformation to the shape and texture information of the human shoulder object. The transformation result is embedded coded based on the object. The resulting embedded coded symbol stream is arithmetic coded to implement the compression of the colored human face image. The corresponding reverse process is the decoding method. The invention divides the edge of the human shoulder object accurately in the automatic mode or the interactive mode, reduces the required edge information after the wavelet transformation. The high visual quality is kept and the compression ratio improved. It can be extensively used in the area of high compression ratio coding to the electric human image data.

Description

technical field [0001] The invention relates to a high compression ratio portrait encoding and decoding method, more precisely, relates to a fully automatic or interactive human shoulder object extraction technology, which belongs to the technical field of image compression. Background technique [0002] At present, there are many high-performance image compression methods in the world, such as the international standard JPEG2000 and vector quantization formulated by the Joint Photographic Experts Group. However, there are not many high-compression ratio encoding and decoding methods for portraits in the fields of network transmission, file management, electronic documents, and embedded systems. [0003] Since the early 1990s, with the development and improvement of wavelet theory, various image compression algorithms for wavelet transform have gradually developed. These methods combine wavelet transform with embedded quantization and entropy coding to obtain higher coding ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T9/00
Inventor 闫宇松
Owner 闫宇松