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 :
·研究团队邀请了99位PTSD不同程度患者分为三组，包括多种职业和经历，其中一组游玩《俄罗斯方块》，其他组采取传统音乐等疗法，进行对比试验。
。同城约会是该领域的重要参考
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