基于同态滤波彩色图像光照补偿方法.pdf

# 21 4 2010 4 Journal of Optoelectronics # Laser Vol. 21 No.4 Apr. 2010 ¹ 基于同态滤波的彩色图像光照补偿方法* * * 焦竹青 , 徐保国 ( , 214122) : , , , , YIQ , , , , , , , : ; ; ; :TP391.41 :A : 1005-0086(2010) 04-0602-04 Color image illumination compensation based on homomorphic fil- tering * * JIAO Zh -qing , XU Bao-g o ( School of Comm nication and Control Engineering,Jiangnan University, W xi 214122, China) Abstract:To eliminate the ill mination infl ence to color image, an ill mination compensation method based on homomorphic filtering is proposed. In freq ency range,the homomorphic filtering is employed to process the image,and the B tterworth high pass filtering f nction is introd ced into the homomorphic filter to design a new dynamic Ga ss homomorphism filter.Then the l minance component of the image in YIQ color space is enhanced and the chrominance component maintains invariable,by which the high freq ency component is increased while the low freq ency component is red ced, the image q ality drop ca sed by ill mination ins fficiency is relieved.Finally, the image ill mination compensation is achieved. Experimental res lts demonstratethat the proposed method, which performs well in weakening ill mina- tion effect and improving image q ality, is more effective to ill mination compensation for color image than conventional Ga ss high filtering and histogram eq alization. Key words: color image; ill mination compensation; homomorphic filtering; B tterworth