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Research of Image Enhancement Techniques Using Retinex and Its Implementation on DSP

Author: ZhaoZhiHua
Tutor: GaoQingWei
School: Anhui University
Course: Pattern Recognition and Intelligent Systems
Keywords: Retinex image enhancement DM642 video processing
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 69
Quote: 0
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Abstract


As the rapid development of image processing technology recent years,the application has been used to the national economy and the people’s livelihood deeply.Image enhancement plays a very important role as a direction of image processing,Retinex algorithm has been rapidly used by people as a kind of approximate optimal method used for scene reappearance,it is a nonlinear transform which can improve image brightness,contrast,resolution,it can also provide three characteristics:dynamic range compression,color constancy and color rendition.this method has been applied in all kinds of static images successfully,However,because image processing involved enormous amount of data,processing speed of image processing has became one of the bottle-necks restricting its development.Real-time image processing emerged as the times require.Hardware of image processing has been developed rapidly,usually special image processing chip has a high price,also it has a bad flexibility and a limit to expand so that it is hard to realize new functions and algorithms.Digital signal processor DM642 is currently recognized a well-behaved multimedia processor in the industry cycle, it is a 32-bit fixed-point DSP chip specialize for multimedia.It is based on C64x DSP kernel,using a two-level buffer mechanism and provides abundant peripherals interface so that it can be very convenient to realize real-time processing of image and it can be used to development of multimedia application,also the hardware implementation is more convenient,at the same time,TI provides a powerful development software,abundant library functions and API functions,so nowdays the chip becomes one of ideal platforms for real-time image processing and lays a solid foundation for real-time image processing.Firstly,this paper introduces Retinex method on the basis of several classic image enhancement methods,and then proposes a new comprehensive Retinex method based on bilateral filter,and then analyses and compares various traditional Retinex methods with method of this paper,also evaluation in improving image quality,color maintaining and computing speed was done,at the same time we analysis advantages and disadvantages of them,Experimental results demonstrate that Retinex method works well for gray images and color images and confirm that this new Retinex methods proposed can not only realize image enhancement but also accelerate image processing which provides the possibility for real-time processing.After that,this paper realize classical Retinex algorithms on SEED-VPM642 made by SEED and optimize the implementation of Retinex methods,Finally,the thesis points out future research directions,The article points out that DaVinci digital media processor launched by TI company will become better platform for choice.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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