Article,
A Review on Automatic Color Form Dropout for Document Processing
International Journal on Recent and Innovation Trends in Computing and Communication, 3 (1): 72--75 (January 2015)
DOI: 10.17762/ijritcc2321-8169.150116
Abstract
Color Dropout converts documents like color forms to black and white images by deleting the specific color which is maintained only the information entered in the form. The successful color dropout simplifies the task of extracting textual information from the image for the reader. The color dropout filter parameters include the color values of the non-dropout colors, color space conversion, distance calculation, dropout threshold detection. Color dropout is done by converting pixels that have color within the tolerance sphere of the non-dropout colors to black and all others to white in RGB or a Luminance-Chrominance space. This approach uses an ideal FPGA platform which lends itself to high-speed hardware implementation with low memory requirements,. This is done using VHDL coding. The color space transformation from RGB to YCbCr involves a matrix multiplication and the dropout filter implementation is similar in both cases. Color dropout processing result may be either represented in RGB or YCbCr
