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 :
文章指出，IBM Z 大型机平台的核心价值不在 COBOL，而在于其从芯片到操作系统的垂直整合架构，能够提供极高的事务处理能力、安全性与可用性。
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// 易错点6：忘记将当前元素入栈，导致前面的元素无法匹配到当前值
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the training data