Global contrast enhancement using block based local contrast improvement

摘要

A global contrast improving method through the local contrast improvement of an image is provided to obtain a global smoothing function from a temporal image having the improved local contrast. A block-based local histogram smoothing step is performed for various sizes of blocks(110-130). A global contrast improvement technique is performed through the block-based local contrast improvement. A contrast ratio of an image having the improved local contrast is measured(150). In the smoothing step, temporal images having various sizes of blocks are generated. The block-based local histogram smoothing is performed for each temporal image.