A New Approach to Measuring Perceived Contrast for Complex Images

Abstract

The problem of assessing the overall contrast of complex images is considered. The problem of increasing the accuracy of the quantitative evaluation of the perceived contrast for the complex multi-element images is being solved. This paper proposes a new approach to measuring the overall contrast of a complex image based on an estimate of the perceived contrast of the all pairs of elements of image (objects and background). A new approach to estimating the contrast of two elements of a complex image is proposed based on measuring the perceived contrast of a simple two-element image of these elements relative to the adaptation level for this simple image. The proposed approach is based on measuring the ratios between the values of mean absolute deviation of the brightness of simple image relative to the level of adaptation and the level of adaptation. A possible implementation of the proposed approach to measuring the perceived contrast for a weighted contrast kernel is considered. A new technique of measuring the perceived contrast of multi-element images for weighted contrast is proposed. The paper presents the results of research of the known no-reference metrics of contrast and proposed technique of measuring the perceived contrast of image for two groups of test images. The proposed technique of measuring the contrast enables to increase the accuracy of the estimated contrast for complex images.