Beyond Joint Demosaicking and Denoising: An Image Processing Pipeline for a Pixel-bin Image Sensor

19 Apr 2021  ·  SMA Sharif, Rizwan Ali Naqvi, Mithun Biswas ·

Pixel binning is considered one of the most prominent solutions to tackle the hardware limitation of smartphone cameras. Despite numerous advantages, such an image sensor has to appropriate an artefact-prone non-Bayer colour filter array (CFA) to enable the binning capability. Contrarily, performing essential image signal processing (ISP) tasks like demosaicking and denoising, explicitly with such CFA patterns, makes the reconstruction process notably complicated. In this paper, we tackle the challenges of joint demosaicing and denoising (JDD) on such an image sensor by introducing a novel learning-based method. The proposed method leverages the depth and spatial attention in a deep network. The proposed network is guided by a multi-term objective function, including two novel perceptual losses to produce visually plausible images. On top of that, we stretch the proposed image processing pipeline to comprehensively reconstruct and enhance the images captured with a smartphone camera, which uses pixel binning techniques. The experimental results illustrate that the proposed method can outperform the existing methods by a noticeable margin in qualitative and quantitative comparisons. Code available:

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Task Dataset Model Metric Name Metric Value Global Rank Result Benchmark
Joint Demosaicing and Denoising BSD100 PIPNet PSNR 41.75 # 1
Joint Demosaicing and Denoising Kodak25 sigma15 PIPNet Average PSNR 35.81 # 1
Joint Demosaicing and Denoising McMaster PIPNet Average PSNR 38.13 # 1
Joint Demosaicing and Denoising Urban100 PIPNet Average PSNR 37.51 # 1


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