US Patent 7783122 Banding and streak detection using customer documents

A method of detecting image quality defects includes providing an electronic image including electronic image data, rendering an image based on the electronic image data, capturing the rendered image, the captured image including captured image data, deriving one-dimensional profiles from the captured image data, each of the captured one-dimensional profiles being derived from a set of image data in the same direction, optionally, deriving reference one-dimensional profiles from the electronic image data and generating a difference profile from the reference and captured one-dimensional profiles, and evaluating at least one of the captured one-dimensional profiles and reference one-dimensional profiles for image quality defects.