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You're missing that 1 should be added when computing the area in case when working with the pixel coordinates, otherwise the result is wrong. This is explained here: https://stackoverflow.com/questions/25349178/calculating-percentage-of-bounding-box-overlap-for-image-detector-evaluation
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You're missing that 1 should be added when computing the area in case when working with the pixel coordinates, otherwise the result is wrong.
This is explained in answers here: https://stackoverflow.com/questions/25349178/calculating-percentage-of-bounding-box-overlap-for-image-detector-evaluation
One more article on this: https://www.pyimagesearch.com/2016/11/07/intersection-over-union-iou-for-object-detection/