The adjustment of keypoint position

[pdoublerainbow]

Hi, author. I have a question about the code in keypoint position adjustment part. The code is here https://github.com/HRNet/HigherHRNet-Human-Pose-Estimation/blob/master/lib/core/group.py#L195, the question is that why the position value need to add 0.5 .

[bowenc0221]

This is because during training keypoints are rounded to integer coordinate (but their location could be continuous value). A 0.5 is added here to compensate the quantization error.

[seekFire]

@bowenc0221 How is the value(0.5) determined? Is it because the size of final_heatmaps is 0.5X that of original image ?