Low code rate image compression method based on down sampling and interpolation

A technology of image compression and low bit rate, applied in the field of image processing, can solve the problem of poor compression effect, achieve good subjective visual effect, retain separability and simplicity, and avoid frequency aliasing
CN101668196AInactive Publication Date: 2010-03-10XIDIAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIDIAN UNIV
Publication Date
2010-03-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a low code rate image compression method based on down sampling and interpolation, mainly overcoming the defects of low objective PSNR value and unclear texture edges in subjective image quality in the prior low code rate image compression. The low code rate image compression method comprises the following implementation steps: (1) carrying out Laplacian pyramid decomposition on an initial image and sampling under low-pass filtration to generate a low-frequency subband signal; (2) carrying out the adaptive direction coding of the low-frequency subband signal to generatethe compressed stream information of a low code rate compressed image; (3) carrying out the adaptive direction improving decoding of the compressed stream information of the low code rate compressedimage and generating a reconstructed low-frequency subband signal; and (4) carrying out directional wave interpolation recovery on the decoded low-frequency subband signal and generating a reconstructed image. The invention has the advantages of high objective PSNR value and more clear edge and texture details of low code rate compression and can be used for recovering real-time compressed image transmission with high quality.
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Description

technical field

[0001] The invention belongs to the technical field of image processing, and relates to digital image compression, in particular to a low-bit-rate image compression method based on Laplacian downsampling and directional wave interpolation, which can be used for real-time communication and post-processing of low-bit-rate images High-quality image decoding recovery. Background technique

[0002] Image compression and communication often require real-time and high efficiency. In recent years, multimedia applications such as image progressive transfer coding based on multi-scale representation, multiple quality services, and image reconstruction at low bit rates have been widely used, and the development prospects are promising. Due to its excellent characteristics, such as multi-scale and multi-resolution representation, efficient energy aggregation, etc., JPEG2000 based on discrete wavelet transform (DWT) has become one of the most important standard technolog...

Claims

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