JPEG Quantized Coefficient Recovery via DCT Domain Spatial-Frequential Transformer

arXiv:2308.09110v2 Announce Type: replace-cross
Abstract: JPEG compression adopts the quantization of Discrete Cosine Transform (DCT) coefficients for effective bit-rate reduction, whilst the quantization could lead to a significant loss of important image details. Recovering compressed JPEG images in the frequency domain has recently garnered increasing interest, complementing the multitude of restoration techniques established in the pixel domain. However, existing DCT domain methods typically suffer from limited effectiveness in handling a wide range of compression quality factors or fall short in …

abstract arxiv compression cosine cs.cv domain eess.iv image images loss quantization rate recovery restoration spatial transformer type via