Ms. Soo-Jin Sung Profile

Soo-Jin Sung

at Kyungpook National Univ

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Proceedings Article | 28 January 2008 Paper

Color correction of projected image on color-screen for mobile beam-projector

Chang-Hwan Son, Soo-Jin Sung, Yeong-Ho Ha

Proceedings Volume 6807, 68070F (2008) https://doi.org/10.1117/12.766047

KEYWORDS: RGB color model, Cameras, Image quality, Reflectivity, Modulation, Light sources, Data modeling, Cell phones, Electro optical modeling, Image compression

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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 a colored wall and paper, not on a white screen mainly used in an office environment. Thus, color correction method for the projected image is proposed to achieve good image quality irrespective of the surface colors. Initially, luminance values of original image transformed into the YCbCr space are changed to compensate for spatially nonuniform luminance distribution of arbitrary surface, depending on the pixel values of surface image captured by mobile camera. Next, the chromaticity values for each surface and white-screen image are calculated using the ratio of the sum of three RGB values to one another. Then their chromaticity ratios are multiplied by converted original image through an inverse YCbCr matrix to reduce an influence of modulating the appearance of projected image due to spatially different reflectance on the surface. By projecting corrected original image on a texture pattern or single color surface, the image quality of projected image can be improved more, as well as that of projected image on white screen.

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