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21 February 2007 A practicable method for color classification using low-cost remission/reflection sensors
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A low-cost sensor platform (MORES Sensor) was combined with a microcontroller to build up an embedded solution which e.g. allows for a small hand-held Color Estimation System for blind people. The color sensor used here measures the intensity response of a surface caused by radiation with a specific wavelength in the range of visible light. This radiation is realized by means of three LEDs, red, green, and blue, so that the response intensity values create an R'G'B' color space, which differs from the standardized RGB color space due to the wavelengths of the LEDs. By adjusting the measured response of the LEDs to the known spectral response of the individual color panels of the Macbeth Color Checker Chart (MCCC) a corresponding set of coordinates can be constructed for this particular R'G'B' color space. Owing to this approach, it is possible to obtain reasonable color classification results, which can be compared to those of far more complex and expensive systems. The verification of the results was done by using the standardized MCCC together with commercial vision solutions (RGB camera in combination with PC software). Moreover, some comparison tests also prove the practicality of the here described low-cost color sensor solution.
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Robert Hauser, Issa Ibraheem, Christian V. Madritsch, Neel Kabirpanthi, Dieter Römhild, Dietmar Starke, Volker Mannheim, Werner Schwab, Jørgen Krohn, Jan Randa, and Thomas Klinger "A practicable method for color classification using low-cost remission/reflection sensors", Proc. SPIE 6501, Sensors, Cameras, and Systems for Scientific/Industrial Applications VIII, 65010Z (21 February 2007);

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