Search Results for author: Abhijith Punnappurath

Found 10 papers, 5 papers with code

Graphics2RAW: Mapping Computer Graphics Images to Sensor RAW Images

no code implementations ICCV 2023 Donghwan Seo, Abhijith Punnappurath, Luxi Zhao, Abdelrahman Abdelhamed, Sai Kiran Tedla, Sanguk Park , Jihwan Choe, Michael S. Brown

The narrowing domain gap between real and synthetic imagery makes it possible to use CG images as training data for deep learning models targeting high-level computer vision tasks, such as autonomous driving and semantic segmentation.

Autonomous Driving Denoising +2

Day-to-Night Image Synthesis for Training Nighttime Neural ISPs

1 code implementation CVPR 2022 Abhijith Punnappurath, Abdullah Abuolaim, Abdelrahman Abdelhamed, Alex Levinshtein, Michael S. Brown

Training nightmode ISP networks relies on large-scale datasets of image pairs with: (1) a noisy raw image captured with a short exposure and a high ISO gain; and (2) a ground truth low-noise raw image captured with a long exposure and low ISO that has been rendered through the ISP.

Image Generation

Learning sRGB-to-Raw-RGB De-rendering with Content-Aware Metadata

1 code implementation CVPR 2022 Seonghyeon Nam, Abhijith Punnappurath, Marcus A. Brubaker, Michael S. Brown

Our experiments show that our learned sampling can adapt to the image content to produce better raw reconstructions than existing methods.

Raw reconstruction

Leveraging the Availability of Two Cameras for Illuminant Estimation

no code implementations CVPR 2021 Abdelrahman Abdelhamed, Abhijith Punnappurath, Michael S. Brown

In this paper, we leverage the availability of these two cameras for the task of illumination estimation using a small neural network to perform the illumination prediction.

Vocal Bursts Valence Prediction

A Little Bit More: Bitplane-Wise Bit-Depth Recovery

1 code implementation3 May 2020 Abhijith Punnappurath, Michael S. Brown

Imaging sensors digitize incoming scene light at a dynamic range of 10--12 bits (i. e., 1024--4096 tonal values).

Quantization

Reflection Removal Using a Dual-Pixel Sensor

no code implementations CVPR 2019 Abhijith Punnappurath, Michael S. Brown

Reflection removal is the challenging problem of removing unwanted reflections that occur when imaging a scene that is behind a pane of glass.

Reflection Removal

As-projective-as-possible bias correction for illumination estimation algorithms

1 code implementation JOSA A 2019 Mahmoud Afifi, Abhijith Punnappurath, Graham Finlayson, Michael S. Brown

Recent work by Finlayson, Interface Focus, 2018 showed that a bias correction function can be formulated as a projective transform because the magnitude of the R, G, B illumination vector does not matter to the AWB procedure.

Revisiting Autofocus for Smartphone Cameras

no code implementations ECCV 2018 Abdullah Abuolaim, Abhijith Punnappurath, Michael S. Brown

The fact that different objectives exist raises the research question of whether there is a preferred objective.

Rolling Shutter Super-Resolution

no code implementations ICCV 2015 Abhijith Punnappurath, Vijay Rengarajan, A. N. Rajagopalan

But CMOS sensors that have increasingly started to replace their more expensive CCD counterparts in many applications do not respect this assumption if there is a motion of the camera relative to the scene during the exposure duration of an image because of the row-wise acquisition mechanism.

Image Super-Resolution

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