半色调图像质量评价研究

合理的数字半色调图像质量评价指标是图像再现技术评价的关键．针对数字半色调方法实现过程的不同，对数字半色调图像的质量在主观、客观和时间复杂性方面分别进行分析．结果表明，采用基于上下文相关的填充曲线半色调方法得到的再现图像主观质量最好，整体统计特性仅次于采用标准误差扩散得到的图像，再现图像的边缘平滑性最好，但是其程序运行时间较长；Bayer抖动和标准误差扩散方法得到的再现图像质量的主客观效果最差，其运行时间较短．

Study on the quality evaluation of halftone image

The logical digital halftone image quality evaluation index is the key of image reproduction technical.Focusing on the difference of halftone image realization processes,digital halftone image quality is analyzed from three facets,which are subject,object and complexity.The results show that the subjective quality of reproduction image which using the halftone method of the relative context filling curves is the best.The whole statistical characteristic is next to that of the standard error diffuses method.The edge smoothness of reproduction image is the best,but the runtime is longer.The subjective andobjective quality of reproduction image which using the method of Bayer dithering and standard error diffuse is the worst,but their runtime is shorter.