对比度和白场设定对图像色彩度视觉感知影响的研究

Study on the Influence of the Contrast and White Point Setting to the Perceived Image Colorfulness

由于显示器件 (如电视机显示屏 )的性能评判是与人的主观感觉不可分离的 ,所以它的研发方向也应以观察者的感受为指导 ,但由于不同文化背景的人的主观感觉有可能存在差异 ,因此研究这种差异对理解如何进一步改进显示器性能有着重要的指导意义。为了了解不同观测者的视觉感知差异 ,通过对彩色电视机上显示的静态图片进行的主观视觉评价实验 ,研究了不同对比度和白场设置对图像色彩度视觉感知的影响 [1 ] ,并通过统计分析 ,发现了人们普遍喜好色彩饱和度大的图像这一结论 ,同时也得到了人们对不同白场设置和对比度等的喜好情况。实验中 ,首先将观察者分成专家 (对显示器件原理以及色度学了解较多的人 )和非专家两组进行评分 ,结果表明 ,专家评分的绝对值均值小于非专家的评分 ,这说明专家不能在大范围内区分不同的图像 ;最后把该结果与荷兰飞利浦研究所所做的相似实验作了比较 ,得到了东西方不同文化背景下视觉感知的差异的分析结果 ,但是对于 CRT显示器件而言 ,高对比度将会产生较大的光点 。

The assessment of the performance of an display i.e. TV set strongly depends on human visual perception which directs. The research and development of the display. The visual perception is influenced by one's different culture background. Study on the difference helpful to understand how to improve the characters of display sets. In this paper, a special experiment is performed, in which, a set of still pictures is displayed on a pair of colour TV sets, and the are asked to assess the image colorfulness for different white point setting and different contrast. Analysis of the evaluation results, indicatis that most people like the more colour saturated picture. Then from the results, the preferred white point setting and contrast can be got. The evaluators are divided into two parts: expert and non-expert. The results shows that the mean value from experts is smaller than that from non-experts.Comparisons of the results with similar experiment done by Philips research. An analytical result is obtained for visual perception study on people of different cultural background between the east and the west countries.