| 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. |
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