输出伪灰度图象的一种新方法

用组织抖动法输出伪灰度(二值)图象有着广泛的应用,但该算法有使输出图象轮廓分辨率下降,文字参数网点化等缺点。为此,本文提出一种将组织抖动与分割相结合的新方法,即先用分割技术得到最佳视觉阈值,再将阈值代入改进的变换式,扩展Bayer矩阵,最后对灰度图象进行二值化,实验结果表明,该方法可显著改善输出图象质量。

A New Method in Outputing Pseudo Halftone Picture

Abstract It is applicable to a great variety of uses to produce binary picture with pseudo halftone by ordered dither technigue. But in the picture ,spatial resolution of edges decreases, letters or drawings are indistinct. To Cope with the drawbacks,a new method is proposed,which combines ordered dither with segmentation. That is, first the optimal visual thresholds is obtained by segmentation technique,and then the thresholds are used to modify the bayer matrix. Finally,the continuetone image is bileveled. The experiments show that the new method has much improved the visual quality of outputing image.