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 :
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科普是国家创新体系的重要组成部分，是实现创新发展的基础性工作。高校是教育、科技、人才的交汇点，高校科普是国家科普体系的重要力量，对推进实现高水平科技自立自强具有重要作用。为深入贯彻落实新修订的《中华人民共和国科学技术普及法》，深入实施《全民科学素质行动规划纲要（2021—2035年）》、《教育强国建设规划纲要（2024—2035年）》，进一步推进高校科普工作高质量开展，充分发挥高校在提升公民科学文化素质、建设科技强国中的重要作用，现提出如下意见。
An Environment Agency spokesperson told the BBC: "As a result of climate change, we are seeing more flooding and extreme weather. Whilst it is sadly not possible to stop all flooding, the Environment Agency is committed to helping communities to adapt.