System and method for measuring mobile document image quality

摘要

A system and method for detecting the quality of a captured digital image depicting a hardcopy document are disclosed. The captured digital image is analyzed to determine a corresponding blurriness, noise, hotspot, and uneven illumination metric representing a quality level of the image data. The blurriness, noise, hotspot, and uneven illumination metrics are then combined to formulate a pass/caution/fail indicator for the user to respond to the captured digital image quality.

主权项

1. A system for measuring image quality comprising:
a digital imaging system configured to capture an image; a data storage system configured to store the captured image as a gray scale image; a processing system configured to access the stored gray scale image, wherein the processing system includes several processing modules, including:
a hotspot detector configured to detect the presence of a hotspot in the stored gray scale image and to set a hotspot flag as true if a hotspot is detected;a noise detector configured to detect the presence of noise in the stored gray scale image and to set a noise flag as true if noise is detected;an uneven illumination detector for detecting the presence of uneven illumination in the stored gray scale image and to set an uneven illumination flag as true if uneven illumination is detected; anda blurriness detector configured to detect the presence of blurriness in the stored gray scale image and to set a blurriness flag as true if blurriness is detected; and an output indicator configured to notify a user if any flags were set as true by the hotspot detector, noise detector, uneven illumination detector, or blurriness detector.