Special Section on Digital Photography

2PFCTM (two pixels, full color): Image sensor demosaicing and characterization

[+] Author Affiliations
Daniel Tamburrino

Ecole Polytechnique Fédérale de Lausanne, School of Computer and Communication Sciences, CH-1015 Lausanne, Switzerland

Jon M. Speigle

Sharp Laboratories of America, 5750 NW Pacific Rim Boulevard, Camas, Washington 98607-9489

Douglas J. Tweet

Sharp Laboratories of America, 5750 NW Pacific Rim Boulevard, Camas, Washington 98607-9489

Jong-Jan Lee

Sharp Laboratories of America, 5750 NW Pacific Rim Boulevard, Camas, Washington 98607-9489

J. Electron. Imaging. 19(2), 021103 (April 05, 2010). doi:10.1117/1.3373512
History: Received June 12, 2009; Revised December 05, 2009; Accepted December 14, 2009; Published April 05, 2010; Online April 05, 2010
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We propose a modification to the standard Bayer color filter array (CFA) and photodiode structure for CMOS image sensors, which we call 2PFC™ (two pixels, full color). The blue and red filters of the Bayer pattern are replaced by a magenta filter. Under each magenta filter are two stacked, pinned photodiodes; the diode nearest the surface absorbs mostly blue light, and the deeper diode absorbs mostly red light. The magenta filter absorbs green light, improving color separation between the blue and red diodes. We first present a frequency-based demosaicing method, which takes advantage of the new 2PFC geometry. Due to the spatial arrangement of red, green, and blue pixels, luminance and chrominance are very well separated in the Fourier space, allowing for computationally inexpensive linear filtering. In comparison with state-of-the-art demosaicing methods for the Bayer CFA, we show that our sensor and demosaicing method outperform the others in terms of color aliasing, peak signal to noise ratio, and zipper effect. As demosaicing alone does not determine image quality, we also analyze the whole system performance in terms of resolution and noise.

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© 2010 SPIE and IS&T

Citation

Daniel Tamburrino ; Jon M. Speigle ; Douglas J. Tweet and Jong-Jan Lee
"2PFCTM (two pixels, full color): Image sensor demosaicing and characterization", J. Electron. Imaging. 19(2), 021103 (April 05, 2010). ; http://dx.doi.org/10.1117/1.3373512


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