Image enhancement using background brightness preserving histogram equalisation.
Tan, T. L.
Sim, K. S.
Tso, Chih Ping.
Date of Issue2012
School of Mechanical and Aerospace Engineering
Histogram equalisation (HE) is widely used to enhance the image contrast but it tends to over-enhance the image background brightness. Improvement schemes have been introduced to reduce this defect of the conventional HE, but the over-enhancement of the background brightness is still obvious. A novel approach of nonlinear HE is presented, which is able to enhance the image contrast while preserving the background brightness for images with well-defined background brightness.