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christian-rauch avatar christian-rauch commented on July 4, 2024

The apriltag library needs a white border around the tag to do the edge detection properly. This border is interrupted by the black squares on the corner of the tags.

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wfxcqsc avatar wfxcqsc commented on July 4, 2024

thanks for your reply!
i am sorry about my issue,i put the wrong image in the first picture. the Apriltag board that can be Apriltag library successfully detect is the following
untitled

however, i have tried to cover up the black squares in the AprilGrid,and detect again. but it still doesn't work.
apriltag7

then, i detect the same picture get from the above using OpenCV aruco , there is a"DICT_APRILTAG_36h11", if i don't set the "markBorderBits"(default value is 1), it also can't detect. while i set the parameter "markBorderBits=2", it can be successfully detect
image

Therefore, in addition to black square interruption, is the border width also a part of the impact on detection? and whether the apriltag library can detect the APRILGRID?

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mkrogius avatar mkrogius commented on July 4, 2024

The apriltag library only supports a black border width of 1. It looks like in your image the border width is 2, which is why it is not detected

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