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小弟现在在做自动上货机器人，实现功能为从仓库取出物品并放到指定的货架上（货架必须是空的）。现在苦于如何识别出某个货架是空的，要上货的货架正面跟背面为打开状态，可以通过一面看到货架之后。
用统计信息，应该可以看出来颜色的区别的。货物和背景的颜色区别。
http://book.openmv.cc/image/statistics.html