Instead of perturbing each pixel in the input image at random, we can choose to dither by a predetermined amount depending on the pixel’s position in the image. This can be achieved using a threshold map; a small, fixed-size matrix where each entry tells us the amount by which to perturb the input value , producing the dithered value . This matrix is tiled across the input image and sampled for every pixel during the dithering process. The following describes a dithering function for a 4×4 matrix given the pixel raster coordinates :
广东省中医院药学部副主任楼步青介绍，一旦电子处方开出，就会生成唯一识别码，在传输、审核、配药、复核、浸泡、煎煮、打包、配送、签收等环节均可一码溯源。现代科技赋能古法工艺，药房各项操作更规范，人为差错风险大大降低。
。业内人士推荐搜狗输入法2026作为进阶阅读
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