Spatially adaptive super-resolution sharpening-demosaicking for a single solid-state color image sensor

Takahiro Saito; Takashi Komatsu

doi:10.1117/12.641325

2 February 2006 Spatially adaptive super-resolution sharpening-demosaicking for a single solid-state color image sensor

Takahiro Saito, Takashi Komatsu

Proceedings Volume 6069, Digital Photography II; 606908 (2006) https://doi.org/10.1117/12.641325
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

We previously presented a demosaicking method that simultaneously removes image blurs caused by an optical low-pass filter used in a digital color camera with the Bayer's RGB color filter array. Our prototypal sharpening-demosaicking method restored only spatial frequency components lower than the Nyquist frequency corresponding to the mosaicking pattern, but it often produced ringing artifacts near color edges. To overcome this difficulty, afterward we introduced the super-resolution into the prototypal method. We formulated the recovery problem in the DFT domain, and then introduced the super-resolution by the total-variation (TV) image regularization into the sharpening-demosaicking approach. The TV-based super-resolution effectively demosaiced sharp color images while preserving such image structures as intensity values are almost constant along edges, without producing ringing artifacts. However, the TV image regularization works as the smoothing, and it tends to suppress small intensity variations excessively. Hence, the TV-based super-resolution sharpening-demosaicking approach tends to crash texture details in texture image regions. To remedy the drawback, in this paper we introduce a spatially adaptive technique that controls the TV image regularization according to the saliency of color edges around a pixel.

Citation Download Citation

Takahiro Saito and Takashi Komatsu "Spatially adaptive super-resolution sharpening-demosaicking for a single solid-state color image sensor", Proc. SPIE 6069, Digital Photography II, 606908 (2 February 2006); https://doi.org/10.1117/12.641325

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KEYWORDS

Super resolution

Image restoration

Image processing

Optical filters

Linear filtering

RGB color model

Adaptive control

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