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Image enhancement using background brightness preserving histogram equalisation

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3 Author(s)
Tan, T.L. ; Fac. of Eng. & Technol., Multimedia Univ., Jalan Ayer Keroh Lama, Malaysia ; Sim, K.S. ; Tso, C.P.

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.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 3 )