计算机科学 ›› 2014, Vol. 41 ›› Issue (12): 245-250.doi: 10.11896/j.issn.1002-137X.2014.12.053
赵通,王国胤,肖斌
ZHAO Tong,WANG Guo-yin and XIAO Bin
摘要: 直方图均衡化作为一种特殊的直方图规定化方法,能有效地增强图像的对比度,但其对直方图活动范围的拉伸通常会造成图像过度增强。一种基于高斯函数的直方图规定化算法可提高控制对比度活动范围的能力,然而该算法处理的图像缺乏层次感。基于此,提出一种基于多峰高斯函数的直方图规定化算法,该算法首先用直方图求导方法估算出原直方图的局部峰值和方差,从而得到原直方图的多峰高斯函数,然后采用扩展后的多峰高斯函数作为目的直方图进行规定化。此算法的主要特点是改变局部峰的参数,有选择地对某局部灰度范围进行对比度增强,从而拉伸整个图像对比度的活动范围。对于彩色图像增强,该算法在对彩色图像R,G,B 3个分量子图直方图规定化处理的基础上,根据人类视觉习惯,引入彩色恢复因子将规定化的R,G,B分量进行有效合并。实验结果和原理分析表明,该算法能有效增强图像的视觉效果,使其细节明晰,层次丰富。
[1] Wang Qian,Chen Li-ya,Shen Ding-gang.Fast Histogram Equa-lization for Medical Image Enhancement [C]∥British Columbia,Canada:30th Annual International IEEE EMBS Conference Vancouver.2008:2217-2220 [2] Wang Zhi-ming,Tao Jian-hua.A Fast Implementation of Adaptive Histogram Equalization[C]∥ IEEE ICSP2006 Proceedings.China,2006:16-20 [3] Stark J A.Adaptive Image Contrast Enhancement Using Genera-lizations of Histogram Equalization [J].IEEE Transaction on Image Processing,2000,9:889-896 [4] Coltuc D,Bolon P,Chassery J M.Exact Histogram Specification [J].IEEE Transaction on Image Processing,2006,15(5):1143-1152 [5] 张懿,刘旭,李海峰.自适应图像直方图均衡算法 [J].浙江大学学报:工学版,2007,41(4):630-633 [6] Sengee N,Choi H.Brightness Preserving Weight ClusteringHistogram Equalization [J].IEEE Transactions on Consumer Electronics,2008,54(3):1329-1337 [7] Sheet D,Garud H,Suveer A,et al.Brightness preserving dynamic fuzzy histogram equalization [J].IEEE Transaction on Image Processing,2009,18(9):1921-1935 [8] Celik T.Two-dimensional histogram equalization and contrastenhancement [J].Pattern Recognition,2012,45(10):3810-3824 [9] 孔军,蒋敏,汤心溢.多均值正态分布图像规定化处理 [J].计算机工程与应用,2011,47(21):10-12 [10] 肖斌,王暄,毕秀丽,等.一种基于高斯函数的直方图规定化算法 [J].铁道学报,2006,28(4):119-122 [11] Gonzalez R C,Woods R E,Eddins S L.Digital Image Processing using Matlab [M].Beijing:Publishing House of Electronics Industry,2003 [12] Celik T,Tjahjadi T.Automatic Image Equalization and Contrast Enhancement Using Gaussian Mixture Modeling[J].IEEE Transactions on Consumer Electronics,2012,21(1):145-156 |
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