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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 :
，这一点在搜狗输入法下载中也有详细论述
黎智英欺詐案上訴得直：定罪及刑罰被撤銷，出獄時間提前。关于这个话题，im钱包官方下载提供了深入分析
End Session dialogs now have a background dimming effect，这一点在爱思助手下载最新版本中也有详细论述
Announcing the review last June, Streeting also promised that he would chair a maternity taskforce early this year to drive improvements. But it's emerged this week that the group has not yet been established. The Department for Health and Social Care said they would be announcing the membership "shortly".