Based On The Jpeg Standard Of Image Processing On The Mcf5329

The direction of the paper is the realization of JPEG coder and decoder technology under DSP.With the rapid development of network and embedded system,digital images have been used widely in modern society.With the huge size of the image,the image database increases rapidly accordingly.In order to resolve the problem between increasely data and memory storage,the image data must be compressed in storage and transmission.The JPEG compression standard is most popular in the field of digital image processing beause of the good quality of JPEG. Digital signal processor(DSP) is more suitable for digital signal processing than general CPU.Thus there will be of great benefit to employ DSP to real-time image coder and decoder.In the dissertation,the principle of image coding,the JPEG system and the real-time signal processing system based on DSP are introduced first. Then the design of a JPEG real-time image coder and decoder system based on Freescale ColdFire MCF5329 is discussed.The coder system is mainly consist of color space transformation,down- sampling,DCT transform,quantization and huffman coder.Combining the principles of pipelining and parallelism of DSP with DCT theory,we concentrate on the use of Ehanced Multiply Accumulate Unit of MCF5329 by merging the operations of addition and multiplication,and realize 8×8 two dimensions of DCT with one dimension of DCT efficiently.Tests show that the software meets the requirement of real-time coder.Accordingly,the JPEG decoder is mainly consist of huffman decoder, dequantization,IDCT transform,up-sampling and color space transformation.We realize the fast IDCT algorithm efficiently and optimize some key modules.Tests show that the software meets the requirement of real-time decoder.Finally,the dissertation summarizes the shortage of the system,and take the method to modify and introduce the prospect of the system in the future.