JPEG coding method lowering image diamond effect under low compression code rate

A technology of block effect and coding method, applied in the field of JPEG coding, can solve the problems of unsuitable wireless sensor network narrow bandwidth transmission, large coding file, low compression rate, etc., to achieve obvious improvement of block effect, save occupied space, reduce The effect of loss of high frequency coefficients

Inactive Publication Date: 2015-08-26
SOUTHEAST UNIV
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Problems solved by technology

However, the disadvantage of JPEG encoding is that the compression rate is low, the encoded file is large, and it is not suitable for the narrow bandwidth transmission of wireless sensor network

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  • JPEG coding method lowering image diamond effect under low compression code rate
  • JPEG coding method lowering image diamond effect under low compression code rate
  • JPEG coding method lowering image diamond effect under low compression code rate

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[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] attached figure 1 It is a structural block diagram of a JPEG encoder at a low compression rate. The input data in this encoder is the preprocessed original image data, and the RGB signal of the original image is converted into a YUV420 format signal. The chrominance signal is processed 2:1 horizontal downsampling, 2:1 vertical downsampling, 4 Y signals, 1 Cr signal and 1 Cb signal are saved in every 4 pixels on average. For each color component, 8×8 data blocks are taken as the unit, and the minimum coding unit MCU is taken as the unit, and the data blocks of each color component enter the encoder according to the ratio of 4:1:1. Therefore, after every 4×64 Y component data are input, 64 Cr component data and 64 Cb component data are input sequentially, that is, the encoder performs processing according to the minimum coding unit MCU. The input data passes thr...

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Abstract

The invention discloses a JPEG coding method lowering image diamond effect under a low compression code rate. A full-phase anti-discrete cosine bi-quadrature transformation replaces discrete cosine transform algorithm in conventional JPEG coding, and uniform quantification is employed, thereby solving the problem of severe loss of high frequency coefficient generated during increasing a data compression ratio in conventional JPEG coding, better recovering image details corresponding to the high frequency coefficient during reconstruction of images, and solving the problem of obvious diamond effect under low compression code rate. The coding method ensures coding image quality and overcome the defects of low JPEG coding compression ratio in the prior art, so that image documents are more suitable for transmission with narrow bandwidth. The JPEG coding method has promising prospect in an image processing field of a wireless multimedia sensor network.

Description

technical field [0001] The invention relates to an improved method of JPEG image coding, in particular to a JPEG coding method in the field of image processing which reduces image block effect under low compression rate. Background technique [0002] As a comprehensive information system, wireless sensor network integrates information collection, processing and transmission, and has broad application prospects in military, environment, medical, smart home and many other fields. With the promotion of market demand, the simple data that wireless sensor networks such as temperature, humidity, and pressure can provide can no longer satisfy people's overall control of the monitoring environment. People urgently need to introduce more information-rich multimedia information such as images, audio and video, to make environmental monitoring more accurate and detailed in actual operation, so wireless multimedia sensor networks have emerged. [0003] The salient feature of wireless m...

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Application Information

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IPC IPC(8): H04N19/86H04N19/60H04N19/124H04N19/186
Inventor 刘昊边弘宇李红
Owner SOUTHEAST UNIV
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