【作者】 袁雪庚；

【导师】 顾耀林；

【作者基本信息】 江南大学 ， 计算机应用技术， 2005， 硕士

【摘要】 本文研究了彩色图像的显示问题,分析了国内外该领域的研究现状,在动态范围压缩和色彩校正两个问题上,针对其核心技术(如调整映射曲线,Retinex,自动色彩校正等)提出了改进算法或是新算法。解决了图像显示中亮、暗区难于同时增强的问题;并且通过卷积计算解决了自动色彩校正技术的速度问题。试验效果良好,为彩色图像显示的实用化打下了基础。第一章是绪论,主要介绍了动态图像显示和颜色校正两个问题产生的背景,特点和现有处理此问题的方法。并且给出了本文在这个方面的相关工作。并且稍后指出两者的关系。第二章是调整映射技术,这里我们介绍了人眼视觉系统的特征,描述了基于此的两种主流算法,调整映射曲线和调整映射操作。并将人眼视觉系统和直方图结合起来,得到新的快速调整映射曲线算法。第三章是Retinex技术,在简单的Retinex介绍之后,给出了两个有代表性的Retinex模型—MMT-99,MSR(Multi-Scale Retinex)。并且基于前者提出了两种改进算法,尤其是后面的改进是将Retinex技术嵌入到小波中,得到良好的效果。第四章是色彩校正技术,在分析了色彩校正技术产生的背景和所面临的问题后,介绍了一些重要的校正算法,如GW(Gray World),ACE(Automatic Color Equalization)等。并且提出了关于ACE的快速算法。第五章是结论和未来的工作,在全面的总结本论文后,提出了将来要作的工作更多还原

【Abstract】 The problem of the color image rendering was researched in this paper. Based on investigation and analysis of current situation in this field both in our country and abroad, the progressive algorithms and new ones were proposed pointing at kernel techniques such as Tone mapping curves, Tone mapping operators, Retinex and Automatic color equalization. The difficulty of simultaneously raising contrast in both bright and black zone was got through. The processing speed-the choke point of ACE-was successfully disposed by new style convolution. Experiments with effective result support the applications of the color image rendering technique in real world.In chapter 1, the background, features and processing methods of HDRI (high dynamic range image rendering) and Color Correction are mainly introduced. The relationship of the problems is depicted after the explicit description of the related work of mine.In chapter 2, the mainstream algorithms in Tone Mapping Technology called TRC (Tone Reproduction Curve) and TRO (Tone Reproduction Operation) based on the feature of human vision system are illustrated. The new fast algorithm that combines the human vision system and histogram is created and introduced in every detail.In chapter 3, the Retinex technique is thoroughly depicted. After introduction to the conception of Retinex, tow representative models named MMT-99 and MSR (Multi-Scale Retinex) are given. Tow improved algorithms based on the former are announced later. Especially, the new algorithm embedding Retinex into Wavelet shows better effect than the origin.In chapter 4, the analysis of the generating background and problems confronted to the Color Correction is done. GW (Gray World), ACE (Automatic Color Equalization), the mainly algorithms of the Color Correction , are introduced. The new and fast ACE algorithm is proposed here with explanation of detail steps and test results.In chapter 5, the conclusions are achieved from this paper and future works are fully discussed later on.更多还原