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在提供特征匹配目标的时候，如何增加openmv提取到的特征点？捕捉到的特征点经常只有几个，后续搜寻目标时很困难。 搜寻特征匹配目标时，如何根据前面提取到的特征点设置判断是否为目标的特征点数量？而不是设置某一固定值？
特征点主要是角点，如果你的物体角点很少，那么就是特征少。
https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.Image.image.find_features
find_features有threshold参数。