# Deep Atrous Guided Filter for Image Restoration in Under Display Cameras Source: [Deep Atrous Guided Filter for Image Restoration in Under Display Cameras]() Collection index: [llms.txt]() Data updated: 2025-10-25T22:33:00.328Z Authors: Varun Sundar, Sumanth Hegde, Divya Kothandaraman, Kaushik Mitra Published: 2020-08-14T07:54:52.000Z ## Abstract Under Display Cameras present a promising opportunity for phone manufacturers to achieve bezel-free displays by positioning the camera behind semi-transparent OLED screens. Unfortunately, such imaging systems suffer from severe image degradation due to light attenuation and diffraction effects. In this work, we present Deep Atrous Guided Filter (DAGF), a two-stage, end-to-end approach for image restoration in UDC systems. A Low-Resolution Network first restores image quality at low-resolution, which is subsequently used by the Guided Filter Network as a filtering input to produce a high-resolution output. Besides the initial downsampling, our low-resolution network uses multiple, parallel atrous convolutions to preserve spatial resolution and emulates multi-scale processing. Our approach's ability to directly train on megapixel images results in significant performance improvement. We additionally propose a simple simulation scheme to pre-train our model and boost performance. Our overall framework ranks 2nd and 5th in the RLQ-TOD'20 UDC Challenge for POLED and TOLED displays, respectively. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. - [Under-Display Camera Image Restoration on POLED 49 (val)](): Under-display camera image restoration; POLED 49 (val); PSNR: 33.79. - [UDC Restoration on POLED (test)](): UDC Restoration; POLED (test); PSNR: 32.29. - [Under-Display Camera Image Restoration on TOLED 49 (val)](): Under-display camera image restoration; TOLED 49 (val); PSNR: 37.87. - [UDC Restoration on TOLED (test)](): UDC Restoration; TOLED (test); PSNR: 36.49. - [Hardware-induced Blur Removal on T-OLED](): Hardware-induced Blur Removal; T-OLED; PSNR: 36.49. - [UDC Image Restoration on Synthetic UDC dataset HDRI Haven (test)](): UDC Image Restoration; Synthetic UDC dataset HDRI Haven (test); PSNR: 27.12. ## Original sources and implementation [Original paper]() [PDF]()