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Color Correction of Images Projected on a Colored Screen for Mobile Beam Projector

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With the current trend of digital convergence in mobile phones, mobile manufacturers are researching how to develop a mobile beam projector to cope with the limitations of a small screen size and to offer a better feeling of movement while watching movies or satellite broadcasting. However, mobile beam projectors may project an image on arbitrary surfaces, such as colored walls and papers, not only on a white screen as is mainly used in an office environment. Thus, a color correction method for the projected image is proposed to achieve good image quality irrespective of the surface color. Initially, luminance values of the original image in the YCbCr color space are changed to prevent unnatural luminance reproduction of the projected image, depending on the contrast and luminance of the surface image captured with a mobile camera. Next, the chromaticity values for the captured surface and white screen images are calculated using a ratio of the sum of three RGB values compared to one another. Then, their chromaticity ratios are multiplied by the converted image through an inverse YCbCr matrix to reduce the influence of modulating the color tone of the projected image due to spatially different reflectances on the surface. By projecting the compensation image on a texture pattern or single color surface, the image quality of the projected image can be improved, compared to that of the projected image on a white screen.
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Document Type: Research Article

Affiliations: School of Electrical Engineering and Computer Science, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Korea

Publication date: 2008-05-01

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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