Photo from the camera
· scale taken from the centre disc
Disc size-error range
–
Flattened using marker corners
· top-down view
Disc size error
–
· mean
–
Measured too small
too large
±10%
±1%
Camera tilt
Sheet rotation
Camera height
Corner detection error
Standard deviation, image pixels
Points used
Outer 4
16
Print scale
100%
97.3%
94.1%
Lens distortion
Residual barrel distortion at the photo corner
Top-left marker lift
Height the paper has curled up