A background detection process that analyzes background information for the purpose of limiting the impact of intensity information obtained from non-document areas includes: identifying a first white peak from pixels within a first document region; identifying a second white peak from pixels within a second document region; determining if the first white peak was identified using image data from outside of the input document; and if so, identifying a third white peak from pixels within the first document region based on the second white peak.
This application is based on a Provisional Patent Application No. 60/341,280, filed Dec. 20, 2001.
CROSS REFERENCE
Cross reference is made to the following related United States Patent Application: "Automatic Background Detection Of Scanned Documents" by R. Nagarajan, X. Li and F. Tse, U.S. Pat. No. 6,674,899 B2. The above patent and the subject matter of the current application were commonly owned at the time of invention of the subject mailer of the present application and currently are commonly owned.
A method for dynamic range adjustment of image data of a captured image by determining a white point of an image. The method also involves determining a black point of the image, classifying pixels of the image, and determining an offset value for a pixel of the image based on the determined black point of the image and the determined classification of the pixel. Dynamic range adjustment of the image data is performed using the determined offset value for the pixels of the image and the determined white point of the image.
