自然图像认知阈值的度量  

Measurement on perception threshold of natural images-A preliminary study

作　　者：刘伟[1] 潘毅[2] 张宏[1] 童勤业[2] 

机构地区：[1]浙江大学生物医学工程及仪器科学学院,浙江杭州310027 [2]浙江大学心理与行为科学系,浙江杭州310027

出　　处：《浙江大学学报（理学版）》2008年第3期318-323,共6页Journal of Zhejiang University（Science Edition）

基　　金：国家自然科学基金资助项目(30170267)

摘　　要：提出了图像认知阈限的概念及其度量方法.通过计算机实验和心理物理学实验,在一个自然图像数据库上研究了不同图像色彩模式和变换方式下的图像认知阈值问题.使用的图像变换方法有尺度变换、高斯噪声变换和运动模糊变换.得出的初步结论是:在自然图像认知的过程中存在一个认知阈限;可以用图像熵和图像分维数来度量图像认知阈值;图像认知过程中存在类似Weber定理所描述的规律;差别阈限图像及其原始图像度量值的比值和图像内容无关,而与图像的色彩模式和变换方法有关.The image perception threshold and its metric approach were proposed. The problem of image perception threshold was studied on a natural image database based on image color/gray mode and different image transformation approaches by using computer and psychophysical experiments. The image transformation approaches used were scale transformation, Gaussian noise transformation and motion blurred transformation. According to the preliminary experimental results, the following conclusions were drawed： There exists a perception threshold when human perceives the natural images. The image perception threshold can be measured by image entropy and image fractal dimension number. There exists a law similar to Weber＇s law when human perceives the natural images. The ratio of metric of the difference image to that of the original image is independent of the image content and is relevant to both image color/gray mode and image transformation approaches.

关 键 词：图像认知阈值 图像熵 视觉复杂性 心理物理学 

分 类 号：B842.1[哲学宗教—基础心理学] TP391.41[哲学宗教—心理学]