Crop bounds in the EXIF-normalized full-resolution query.
Positive resized processing width, before feature extraction.
Positive resized processing height, before feature extraction.
Scale/offset matrix including the half-pixel centre correction. Integer
OpenCV centre (0, 0) maps to the centre of the crop's first processing pixel;
with no resize, that is (region.x + 0.5, region.y + 0.5).
Map OpenCV feature centres in a resized crop to original query pixel edges.