Document processing for automatic color form dropout

Andreas E. Savakis; Christopher R. Brown

doi:10.1117/12.449788

7 December 2001 Document processing for automatic color form dropout

Andreas E. Savakis, Christopher R. Brown

Proceedings Volume 4472, Applications of Digital Image Processing XXIV; (2001) https://doi.org/10.1117/12.449788
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

Color dropout refers to the process of converting color form documents to black and white by removing the colors that are part of the blank form and maintaining only the information entered in the form. In this paper, no prior knowledge of the form type is assumed. Color dropout is performed by associating darker non-dropout colors with information that is entered in the form and needs to be preserved. The color dropout filter parameters include the color values of the non-dropout colors, e.g. black and blue, the distance metric, e.g. Euclidian, and the tolerances allowed around these colors. Color dropout is accomplished by converting pixels that have color within the tolerance sphere of the non-dropout colors to black and all others to white. This approach lends itself to high-speed hardware implementation with low memory requirements, such as an FPGA platform. Processing may be performed in RGB or a Luminance-Chrominance space, such as YC_bC_r. The color space transformation from RGB to YC_bC_r involves a matrix multiplication and the dropout filter implementation is similar in both cases. Results for color dropout processing in both RGB and YC_bC_r space are presented.

Citation Download Citation

Andreas E. Savakis and Christopher R. Brown "Document processing for automatic color form dropout", Proc. SPIE 4472, Applications of Digital Image Processing XXIV, (7 December 2001); https://doi.org/10.1117/12.449788

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available