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 :
从整个行业来看，平板和笔记本电脑都在进行着「趋同进化」——本来是不一样的物种，最终朝同一个方向改变，平板电脑可以外接键盘鼠标，电脑屏幕也可以多点触控。
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2月以来，深藏幕后的“盛屯系”接连出手：一边将亚洲最大硬岩型单体锂矿完全收入囊中，一边远渡重洋拿下了加拿大上市公司Loncor手中的非洲金矿。
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