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 :
当前，智能手机存储芯片采购成本较去年同期已上涨超过80%，且仍未见放缓迹象。受此压力传导，国内多家头部手机品牌已拟定于3月初启动新一轮产品价格调整。这将是近五年来手机行业规模最大、涨幅最为显著的一轮集体调价。（新浪科技、第一财经）
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2. 不改变已有字段/接口语义
63-летняя Деми Мур вышла в свет с неожиданной стрижкой17:54，这一点在夫子中也有详细论述
The background radiation from cosmic rays increases with altitude, from 0.3 mSv per year for sea-level areas to 1.0 mSv per year for higher-altitude cities, so for best results use this on a plane or in outer space，推荐阅读WPS下载最新地址获取更多信息
第七十二条 当事人申请撤销裁决的，应当自收到裁决书之日起三个月内提出。