Point your camera at the whole answer sheet. The scanner uses adaptive contrast for faded printing and uneven lighting and tolerates extra margins and slight movement. A green outline appears when the four printed registration squares are detected; automatic capture follows shortly.
Camera not started.
Automatic capture requires camera permission and HTTPS. For best results, keep the four black registration squares visible and avoid glare. If live detection fails, use the photo option below.
Photograph ONE half-A4 sheet. Keep all four registration squares visible, hold the camera steady, and avoid strong shadows. Adaptive contrast helps with faded printing and uneven light, but cannot recover severe blur or missing marks. Check every detected answer before saving.
Diagnostic overlay: cyan = detected corners; pink = sampled bubble centers for all 70 questions; yellow = first bubble in each column.