第 3 周：扩展到 2-3 个 FE 模块，评估提效与返工率
https://feedx.net
。Line官方版本下载是该领域的重要参考
Unicode ships one confusable map. You need two.
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.