Hello. I used Openmv M7, When I find AprilTag, I met a Error:" MemoryError: Out of fast Frame Buffer Stack Memory! Please reduce the resolution of the image you are running this algorithm on to bypass this issue!", if the distance is over about 40 centermeter, IDE will jump this error. I want to in…

Note sure why you are getting the error. Once suggestion. Limit the minimum ROI size to 32x32 pixels. There’s no lower limit on your math right now. This can cause issues.

I limited the minimum ROI size to 32x32 pixels or 40x40 pixels, sometimes, it can work, but sometimes it can’t. :cry: :cry: Sometimes, As it run, it cause issues. But sometimes, it can run for a while, suddenly, it cause issues. Here is the latest code: # AprilTags Example # # This example sho…

Mmm, I’m not sure what the error is. I’d just do this for now, wrap the call in a try except block and just ignore the error when it happens. The memory allocation footprint of apriltags is constant… so, the only reason I can think you are getting this error is because of the changing roi settings.

Hi, I’m facing the same issue with an H7 cam. April tag detection is done continuously and ROI alternates between the 2 halves of the image (160x120). Sometimes the Out of fast Frame Buffer Stack Memory! error occurred and I don’t know why. Here are my 2 ROIs : roi_april = [(0, 0, 80, 120), …

Hi, the Apriltags algorithm has no hook to block all out of memory errors. The algorithm internally uses a heap which can be exhausted. We have tried to handle many of the out of memory errors… But, for ones we cannot recover from when they happen you get this error. You should just not print the e…

Mhh too bad to hear that, but ok i can understand. Concerning the lost time I observed, 1s is pretty big. Do you think it is because of the log ? Or could it come from the find_apriltag function itself ?

Probably the logging. Most likely an erase happened which blocks for a while.

Ok I will remove the logging and see what happens. Thank you.

what is the biggest size of sensor.set_framesize() for apriltag in openmv4 H7 plus? i find the FHD with ov5640 can’t work for apriltag。 hope apriltag works well with ov5640 in maxsize of framesize

Openmv AprilTag--Out of fast Frame Buffer Stack Memory!

OpenMV Boards

kwagyeman November 5, 2023, 4:30pm 11

Hi, there’s no frame size limit but a CPU limit and RAM limit.

BTW, even a desktop PC struggles with that much resolution for AprilTags…

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Openmv AprilTag--Out of fast Frame Buffer Stack Memory!

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