摘  要：图像增强是对数字图像的预处理,对图像整体或局部特征能进行有效地改善。针对传统直方图均衡算法存在的动态范围小、细节丢失及对比度不自然等问题，提出结合直方图规定化的改进算法。仿真结果表明，经过规定化的灰度级调整后，图像亮度及清晰度均有所增加，层次感增强，细节部分也基本达到预期效果，且复杂度相当，具有实际应用价值。            
关键词：图像增强;直方图;均衡化;规定化;灰度级

Abstract: Image enhancement is a digital image preprocessing, feature the image as a whole or in part, could be effectively improved. Traditional histogram equalization algorithm for the dynamic range of existing small, detail lost and the contrast unnatural and other issues, proposed a histogram specification of the improved algorithm. Simulation results show that, after the provisions of the gray-scale adjustment, the image brightness and clarity have increased, and layered enhancement, details of some basically achieve the desired results, considerable complexity and practical applications.
Key Words: Image enhancement; Histogram; Equalization; Provisions;Gray level