基于滤波器和阈值选取的误差扩散法

文章针对误差扩散算法应用到嵌入式打印系统时，由于点增益导致打印输出的半色调图像产生严重人工纹理这 一问题，提出了一种新的误差扩散滤波器和域值选取方法。该误差扩散滤波器，通过重新设置误差分散权重，将当前点 产生的量化误差分散到其远离邻近的像素上，产生无点增益的点聚集半色调图像；域值选取，选取一个最合适的域值，使 输出图像在中间调区域无明显结构性纹理。实验结果表明，使用新滤波器和阈值选取方法处理过的图像经打印机输出 后整体上更加柔和，在图像的渐变区域无明显人工纹理，效果更好。

Research of Error Diffusion Method Based on Filter and Threshold Selection

A new error diffusion filter and threshold selection method was presented. since the dot-gain resulting halftone image generated severe artificial textures. when the traditional algorithm was applied to the embedded printing system. The error diffusion filter. through resetting the error diffusion weights, diffused the quantization error of the current point to neighboring pixels away from current point. and it could produce point gathered halftone image with no dot-gain. Threshold selection selected the most appropriate threshold. and made the output image having no obvious structural texture in the mid-tones. The experimental results show that this error diffusion filter and threshold selection method can get better visual quality than the previously published known results.