| 摘要: |
| 目的 研究彩色图像像素分布特征及用之提取像素反射和漫射信息的方法， 为从图像中提取其内景物客观颜色外貌提供理论依据。方法 采用理论分析和实验相结合的方法， 剖析图像强度和其内物体及外界光照之间的关联性， 阐明图像像素漫射色度和RGB分强度及总强度之间的客观数据分布特征。结果 图像反射像素的色度分布具有线性和双曲线特性， 而漫射像素的分布具有与光照无关的聚集特性。结论 图像反射和漫射像素的分布规律非常不同， 采用特定斜率不同的直线可以将之有效分离， 再结合特定的像素映射转换机制， 就能获得图像内物体及照明的本质颜色特征。 |
| 关键词: 颜色 光学 信息 特征 |
| DOI： |
| 分类号:TS801.3 |
| 基金项目:国家级大学生创新创业训练计划 （201410057021） |
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| Pixel Distribution Characteristics of Color Images and Light Extraction and Partition of Imaging |
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CHEN Yong-li, ZHANG Xiao-qing, FAN Pei, TIAN Ya-ran
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Tianjin University of Science and Technology，Tianjin 300222，China
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| Abstract: |
| The aim of this study was to explore methods for study of characteristics of pixel distributions of color images and methods for extraction of information of pixel reflection and diffusion, so as to offer theory basis of extraction of objective color appearance of the image. By combination of theoretical analysis and experiment verification, correlations between image intensity and illumination were analyzed, and objective characteristics of data distribution among diffuse chromaticity, pixel channel intensity and pixel overall intensity were clarified. Chromatic distribution of reflection pixels exhibited regular linear and hyperbolic characteristics, while diffusion distribution of pixels had only gathering characteristics unrelated to illumination. Pixel distribution patterns of reflection and diffusion are different for an image and their reflection information can be separated by straight lines with different slopes for RGB channels. Intrinsic color properties of both objects and illumination can be acquired successfully by incorporating a special transformation of pixel mapping. |
| Key words: color optics information characteristic |
