Fig. 4From: Adaptively partitioned block-based contrast enhancement and its application to low light-level video surveillanceResults of the proposed adaptively partitioned block-based dark region detection method. (Black ambiguous regions, white dark region, and gray background region): a input image, b \(k=1\,({n=64}) \), c \(k=5\,( {n=4}) \), and d the finally refined dark regionBack to article page