Abstract
In a digital still camera (DSC) system, in most cases, a dynamic range is compressed linearly in logarithmic space. Therefore, images taken by a DSC tend to be low contrast, and give us flat impression without liveliness in comparison with silver halide photographs. In this report, a new digital image enhancement method based on linear smoothing is proposed. In the proposed method, at first, the structures of an input image are extracted by subtraction between an input image and the smoothed one. Then, the image enhancement is achieved by adding the differential image to the input image. Further, multiscale image enhancement is carried out by setting some strength of smoothing, and the resulting image, that is high contrast and well-sharpened, is provided by synthesizing enhanced images obtained in the previous step. The effectiveness of the proposed method is verified through the experiments.
