Get the head bbox coordinates from the SMPL-X predicted vertices

[oscarlorente]

Hello, I'm using frankmocap to get the SMPL-X model of a man, but I also need to detect his head using the corresponding SMPL-X prediction. So far, I've been able to identify the vertices corresponding to the head (using the SMPL-X - FLAME correspondences from here) and plot it using your openGL renderer:

However, I'm interested in getting the head's bbox coordinates, that is, knowing the pixels on which the SMPL-X vertices are projected. I'm not sure how to get them from the renderer code, any ideas?

[penincillin]

Basically, you need to project the head vertices to image space and obtain head bbox from the projected 2D head vertices. You can check the code here, where pred_vertices_img is already aligned to the image space. You can directly take the [x, y] coordinates to obtain the projected 2D vertices. Since you already know how to select out head vertices, you just need to do that again to pred_vertices_img to obtain the head vertices in image space and then obtain 2D head bbox.

[oscarlorente]

That works like a charm, thank you very much!

[ruyiwei-cas]

@oscarlorente

[ruyiwei-cas]

@oscarlorente How did you get this picture and how to paste the RGB information into the generated mesh.