Tech Papers 2021: This paper explores correcting quantization artifacts in SDR and HDR content, evaluating debanding methods and CNN-based approaches to reduce visible false contours during HDR conversion.
Abstract
Most video contents are encoded using 8 bits per color channel, offering 256 possible values for each component. This has been sufficient for most traditional uses, but with the increased adoption of high dynamic range (HDR) technologies, standard dynamic range (SDR) content, may be up-converted to HDR, leading to an amplification of certain artifacts. Quantization artifacts in particular, taking the form of false contours, may become more visible after luminance expansion, especially in bright image areas. To correct such artifacts, debanding methods first aim at distinguishing between real image edges and contours due to quantization, and follow by filtering steps to correct them.
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