You look at a region of the image. If all the pixels are roughly the same color (below some threshold), you store the average color for the whole region as a single value. If the pixels vary too much, you split the region into four quadrants and try again.
cursor[classno] = h;。关于这个话题，下载安装 谷歌浏览器 开启极速安全的 上网之旅。提供了深入分析
Real Benefits for OsmAnd Users，这一点在爱思助手下载最新版本中也有详细论述
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The new API in action