This paper presents two new methods of image enhancement based on analyze and summarize model and techniques in existence : one is the method based on human vision . it combines human vision with the method based on local statistics ; the local statistics method has been made improvement by this work . the other is the method based on genetic algorithm ( ga ) 本文在分析、总结现有图像增强技术的基础上，提出了两种新的图像增强算法：一是基于人类视觉的图像增强方法，它将人类视觉特性与j . s . lee的局部统计性图像增强方法相结合，是对局部统计性图像增强方法的改进；二是基于遗传算法的图像增强方法，利用遗传算法的寻优特性，结合已有的图像参数模型，找出控制图像质量的参数，采用遗传算法进行参数优化，最终达到信噪比( snr )或其他评价准则意义下的最优。
