Scan region
A region is expressed in normalized coordinates, so it survives whatever resolution the browser negotiates. Cropping happens before any pixel is touched, which makes every later stage cheaper in proportion to the area removed.
Ready
Frame diagnostics
Frame
0.00 ms
Headroom
0 fps
Decoded size
0×0
Scan lines
0
Grayscale 0.00 ms
Binarise 0.00 ms
Matrix 0.00 ms
Linear 0.00 ms
Presets
Custom
Result positions
Corner points are always reported in the coordinates of the frame the camera produced, not of the cropped region, so an overlay drawn from them lines up with what the user sees.
Scan something to see its corner points.