Postfilters show similar characteristics - deblocking and deringing maintain PSNR, but increase quality graining (suggested in H.264) essentially increases video quality, especially on big plasma screens, but decreases PSNR. Deshaking greatly decreases PSNR, but increases visual quality. Denoising and deflicking normally maintain PSNR value while increasing visual quality (the best slow denoising filters also increase PSNR on medium and high bitrates). Codecs often use prefilters such as video denoising, deflicking, deshaking, etc. Pre- and postfilters are widely used in codecs.When codecs with similar objective results show results with different subjective results, the main reasons can be: In the case of video codecs, this is a very common situation.
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