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

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...

AI Technical Summary

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 networks.

If the compression ratio is increased, due to the characteristics of JPEG encoding in a low bit rate environment, it will produce a strong block effect, which is unacceptable to the human eye.

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