Projecting a ROI into a net layer

[Samarth Brahmbhatt]

Hi,

Is there a utility/PR in Caffe that allows one to project a ROI (bounding box) into a layer of the net? e.g. project a bounding box in the image to the topmost conv layer.

I am aware that Fast-RCNN and SPPNet do this, but having a hard time deciphering the formula in SPPNet's code (spm_response_boxes.m). For Fast-RCNN I can't find the exact position in the code where this projection is being done.

Thanks!

[林子達]

Hi ,

Caffe had merged spp layer recently. You can write your utils.

https://github.com/BVLC/caffe/pull/2177/files 

[Samarth Brahmbhatt]

Thanks, I saw that. The SPP net applies SPP to the whole image. I wanted to apply it to a bunch of ROIs. In the end I ended up using the formulas in the Appendix of the SPPNet paper, and they working correctly!