Image processing involves preparing an document image to be efficiently classified, separated, and data-extracted.
Detect DPI (Dot Per Inch)
Scale, flip, or rotate
Remove introduced noise
Remove field-level form structure and pre-printed text
Reshape distorted images
Adjust contrast and brightness
Remove backgrounds and watermarks
Improperly scanned documents are common, and IDP solutions offer basic pre-processing to mitigate issues. Common errors include documents scanned at an angle or upside down and introduced noise (e.g. specks, streaks, or borders) caused by the device used to digitize the original paper document.
Modern systems account for today's multi-channel document scanning needs that include fax, portable scanner, and smartphone imaging.