15 May 2014 Ultra-low power high-dynamic range color pixel embedding RGB to r-g chromaticity transformation
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Abstract
This work describes a novel color pixel topology that converts the three chromatic components from the standard RGB space into the normalized r-g chromaticity space. This conversion is implemented with high-dynamic range and with no dc power consumption, and the auto-exposure capability of the sensor ensures to capture a high quality chromatic signal, even in presence of very bright illuminants or in the darkness. The pixel is intended to become the basic building block of a CMOS color vision sensor, targeted to ultra-low power applications for mobile devices, such as human machine interfaces, gesture recognition, face detection. The experiments show that significant improvements of the proposed pixel with respect to standard cameras in terms of energy saving and accuracy on data acquisition. An application to skin color-based description is presented.
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Michela Lecca, Leonardo Gasparini, Massimo Gottardi, "Ultra-low power high-dynamic range color pixel embedding RGB to r-g chromaticity transformation", Proc. SPIE 9141, Optical Sensing and Detection III, 914107 (15 May 2014); doi: 10.1117/12.2051528; https://doi.org/10.1117/12.2051528
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