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图片中有很多apriltag或者数字，怎么统计下它们的数量？
https://docs.singtown.com/micropython/zh/latest/openmvcam/library/omv.image.html#image.find_apriltags
返回的的数组。
tags = img.find_apriltags() len(tags)就是数量 for tag in tags: 就可以遍历数组。