CAS-CNN: A Deep Convolutional Neural Network for Image Compression Artifact Suppression
This work addresses image quality degradation for users of web and storage media, offering incremental improvements in artifact suppression.
The paper tackles the problem of visual artifacts in lossy image compression by proposing a 12-layer deep convolutional neural network with hierarchical skip connections and a multi-scale loss function, achieving up to 1.79 dB PSNR improvement over JPEG and up to 0.36 dB over previous ConvNet results.
Lossy image compression algorithms are pervasively used to reduce the size of images transmitted over the web and recorded on data storage media. However, we pay for their high compression rate with visual artifacts degrading the user experience. Deep convolutional neural networks have become a widespread tool to address high-level computer vision tasks very successfully. Recently, they have found their way into the areas of low-level computer vision and image processing to solve regression problems mostly with relatively shallow networks. We present a novel 12-layer deep convolutional network for image compression artifact suppression with hierarchical skip connections and a multi-scale loss function. We achieve a boost of up to 1.79 dB in PSNR over ordinary JPEG and an improvement of up to 0.36 dB over the best previous ConvNet result. We show that a network trained for a specific quality factor (QF) is resilient to the QF used to compress the input image - a single network trained for QF 60 provides a PSNR gain of more than 1.5 dB over the wide QF range from 40 to 76.