About image processing

[CheungBH]

Hello. Thanks for your excellent job. When I was doing pose estimation research, I found that there are several methods to unify the different box size into a fixed input-size. One is resizing directly, and another uses letterbox method, that the image will be padded by gray color,

I wonder which method do you use, and are there any references? In my opinion, using padding is better, but I don't know whether I am right.

[jin-s13]

We use the center/scale to crop and resize the image into desired input-size, see TopDownAffine.

[CheungBH]

Thank you. I also notice that the gaussian heatmap of samples in mmpose is circular. But I also notice that there are some repo will restrict the gaussian within a square (like 7x7). I wonder whether there are some reference about it?

[jin-s13]

For higher speed, most repos (including mmpose) restrict the gaussian within a fixed range (3-sigma).