Questions about coordinate conversion

[yinboc]

Questions about coordinate conversion

[danxuhk]

Thanks for your interst in our work!

It is the Equation (2) in the paper, "coord" are the coordinates of HR pixel centers (x_q), "q_coord" are the coordinates of the neatest feature vector (v*), thus "rel_coord" is the input relative coordinate for the decoding function. Multiplying the "rel_coord" with the feature map scale is to normalize the "rel_coord" into the range [-1, 1], since before this line the global range is [-1, 1] but we want to have a local range of [-1, 1] now.

Why we should use a relative coordinate? Why not just use an absolute coordinate (i.e. x_q) to query? It is a bit not clear about the motivation. Could you explain it a bit? @yinboc

[yinboc]

Thanks for your interst in our work!

It is the Equation (2) in the paper, "coord" are the coordinates of HR pixel centers (x_q), "q_coord" are the coordinates of the neatest feature vector (v*), thus "rel_coord" is the input relative coordinate for the decoding function.
Multiplying the "rel_coord" with the feature map scale is to normalize the "rel_coord" into the range [-1, 1], since before this line the global range is [-1, 1] but we want to have a local range of [-1, 1] now.