12 February 2008 Improving the SNR during color image processing while preserving the appearance of clipped pixels
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Abstract
An image processing path typically involves color correction or white balance resulting in higher than unity color gains. A gain higher than unity increases the noise in that respective channel, and therefore degrades the SNR performance of the input signal. If the input signal does not have enough SNR to accommodate the extra gain, the resultant color image has increased color noise. This is the usual case for color processing in cell phone cameras, which have sensors with limited SNR and high color crosstalk. This phenomenon degrades images more as illuminants differ from D65. In addition, the incomplete information for clipped pixels often results in unsightly artifacts during color processing. To correct this dual problem, we investigate the use of under unity color gains, which, by increasing the exposure of the sensor, would improve the resultant SNR of the color corrected image. The proposed method preserves the appearance of clipped pixels and the overall luminance of the image, while applying the appropriate color gains.
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Sergio Goma, Milivoje Aleksic, "Improving the SNR during color image processing while preserving the appearance of clipped pixels", Proc. SPIE 6811, Real-Time Image Processing 2008, 681102 (12 February 2008); doi: 10.1117/12.765199; https://doi.org/10.1117/12.765199
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