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Removing Background Color from Blueprints

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Abstract:

A blueprint is a type of paper-based reproduction. For almost a century blueprint was the only low cost process available for copying drawings. Despite today this technology has been largely superseded by digital printing, it is still being used in emerging countries. When making copies of those documents, the colored background often makes difficult reading the information in the scanned plot. Hence, having an accurate way to transform the background to white enhances the look of the plot, plus saves ink when printing. This paper introduces an algorithm for removing the background color from a blueprint scanned image, comprising processing the image in a colorimetric space by determining the colorimetric values of the background color of the image, computing a linear chromatic adaptation transform for transforming the background-color colorimetric values to values of a target white point, and applying the computed chromatic adaptation transformation to the image.

Document Type: Research Article

Publication date: January 1, 2011

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  • CIC is the premier annual technical gathering for scientists, technologists, and engineers working in the areas of color science and systems, and their application to color imaging. Participants represent disciplines ranging from psychophysics, optical physics, image processing, color science to graphic arts, systems engineering, and hardware and software development. While a broad mix of professional interests is the hallmark of these conferences, the focus is color. CICs traditionally offer two days of short courses followed by three days of technical sessions that include three keynotes, an evening lecture, and a vibrant interactive papers session. An endearing symbol of the meeting is the Cactus Award, given each year to the author(s) of the best interactive paper presentation.

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