电子学报2017，Vol.45Issue(5)：1165-1174,10.DOI:10.3969/j.issn.0372-2112.2017.05.020
图像梯度场双区间均衡化的细节增强
Image Details Enhancement by Gradient Field Bi-interval Equalization
摘要
Abstract
The technique of histogram equalization (HE) is widely used in the field of image enhancement,the method is introduced into the gradient field in this paper,so image details are distributed in each gray level uniformly.Moreover,the characteristics of the histogram of gradient magnitude are studied,according to the right-skewed distribution of gradient magnitude,the gradient field is equalized by two intervals.In terms of the threshold''s selection,numerical characteristics of frequency distribution are considered,two standards of the interval threshold are proposed,which can divide the gradient magnitude into the interval with low magnitude and the interval with high magnitude.On the process of the reconstruction of target gradient field,matrix transform method is proposed,which substitutes the traditional method "difference and iteration method",the proposed method can decrease the algorithm''s time complexity.The experimental results show that the method this paper proposed can make image details enhance effectively.关键词
图像增强/梯度场/直方图均衡化/双区间/梯度幅值直方图/偏度系数Key words
image enhancement/gradient field/histogram equalization/bi-interval/the histogram of gradient magnitude/skewness分类
信息技术与安全科学引用本文复制引用
丁畅,董丽丽,许文海..图像梯度场双区间均衡化的细节增强[J].电子学报,2017,45(5):1165-1174,10.基金项目
国家科技支撑计划(No.2014BAB12B03) （No.2014BAB12B03）
国家自然科学基金(No.61501077) （No.61501077）
中央高校基本科研业务费专项资金(No.3132016351) （No.3132016351）
