Comments (5)
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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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
however, i have tried to cover up the black squares in the AprilGrid,and detect again. but it still doesn't work.
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
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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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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Related Issues (20)
- Improve documentation concerning estimated pose HOT 5
- What do the tag-specific hex codes in the c files represent?
- How to deal with tag36h9? HOT 1
- install problem HOT 5
- Clarify licensing HOT 1
- Geometric interpretation of estimation error HOT 2
- Help with thresholding parameters HOT 1
- How to run pose estimation in python ? HOT 3
- compatibility with WIN32_LEAN_AND_MEAN HOT 8
- Anyone implmented c# wrapper for this? HOT 1
- error when i run make in ubuntu 22.04 HOT 1
- Has anyone confirmed that this library can work on ESP32S3? HOT 3
- How to use intrinsics in Scaramuzza format to estimate the apriltag pose? HOT 3
- Suggestions on improving detections in low light conditions HOT 4
- Python bindings for apriltag_detect throws error when no detection is found HOT 5
- What's the meaning of 'apriltag.c:448: homography_compute2: Assertion `max_val_idx >= 0' failed.'? HOT 5
- Planned Python Package Index (PyPI) package? HOT 4
- Build fail on Ubuntu Noble in g2d.c: `last_quadrant` is used unitialized; treat-all-warnings-as-errors HOT 4
- (Python) 'Nthreads' is an invalid keyword argument for this function HOT 1
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