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The article discusses the segmentation algorithm of digital image based on the measurement contrast of fine detail in the normalized CIELAB system. Using normalized CIELAB system allows you to segment fine detail in accordance with the contrast sensitivity. Focusing the camera is carried out on the basis of the search of function maximum that determines the dependence of the number of segmented fine detail from the focal length. Proposed software as part of an interactive digital camera control system implements this function. The results of experiments and comparative analysis with other methods focus are given. It is shown that the proposed method improves the accuracy of the focus when photographing images in low light.

In this paper we present a novel assessment method of fine-details level (FDL) of photorealistic images. The method is based on the search algorithm and recognitions of fine-details in the normalized color space. The novel image metric allows evaluating quantity of fine-detail fragments which are noticeable an eye. Results of an assessment of method stability to distortion factors are given and applications in the multimedia system are discussed.