数码相机中的彩色成像传感器通过彩色滤波阵列(CFA)在空域经降采样获取三个颜色分量,并通过对三个颜色分量去马赛克、去噪和颜色校正等过程获得最终图像.成像过程的算法比较复杂,尤其部分过程的非线性和噪声影响促使成像过程更趋复杂.研究去马赛克算法引入的噪声及对噪声传播的影响,考虑去马赛克和去噪顺序不同对成像质量造成的影响,为了更好地理解每一步成像过程如何影响和传播噪声,对图像和噪声进行有效监测和分析,并通过MSE和s-CIELAB来衡量噪声特性,最后给出结论.%Color imaging sensors used in digital cameras acquire three spatially subsampled color channels with a Color Filter Array(CFA) mosaic. The acquired image is then processed through an imaging pipeline of demosaicing,denoising and color correction. The algorithms used in each stage of the image pipeline are complex, several processes of nonlinearity and the effect on the noise are complicated. The influence of demosaicing algorithms on the effects of denoising is discussed. This paper investigates the effects of the order of demosaic and denoise process on images and image noise. Images and noises are monitored and analyzed in each stage of the pipeline, to understand how each stage/algorithm affects and manipulates the noise characteristics.Noise characteristics are evaluated by various metrics from MSE and s-CIELAB.Ultimately, this paper gives conclusions.
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