Deringing cartoons by image analogies
ACM Transactions on Graphics (TOG)
Design a deblocking filter with three separate modes in DCT-based coding
Journal of Visual Communication and Image Representation
MPEG2 video parameter and no reference PSNR estimation
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Hardware implementation of MPEG analysis and deblocking for video enhancement
Asilomar'09 Proceedings of the 43rd Asilomar conference on Signals, systems and computers
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Postprocessing of MPEG(-2) video is widely used to attenuate the coding artifacts, especially deblocking but also deringing have been addressed. The focus has been on filters where the decoder has access to the code stream and e.g. utilizes information about the quantization parameter. We consider the case where the coded stream is not accessible, or from an architectural point of view not desirable to use, and instead estimate some of the MPEG stream parameters based on the decoded sequence. The I-frames are detected and the quantization parameters are estimated from the coded stream and used in the postprocessing. We focus on deringing and present a scheme which aims at suppressing ringing artifacts, while maintaining the sharpness of the texture. The goal is to improve the visual quality, so perceptual blur and ringing metrics are used in addition to PSNR evaluation. The performance of the new 'pure' postprocessing compares favorable to a reference postprocessing filter which has access to the quantization parameters not only for I-frames but also on Pand B-frames.