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キーワード:
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要旨:
Due to rapid technological progress in high dynamic range (HDR)
video capture and display, the efficient storage and
transmission of such data is crucial for the completeness of any HDR
imaging pipeline. We propose a new approach for
inter-frame encoding of HDR video, which is embedded in the
well-established MPEG-4 video compression standard. The key
component of our technique is luminance quantization
that is optimized for the contrast threshold perception in the
human visual system. The quantization
scheme requires only 10--11 bits to encode 12 orders of magnitude of
visible luminance range and does not lead to perceivable contouring
artifacts. Besides video encoding, the proposed quantization
provides perceptually-optimized luminance sampling for fast
implementation of any
global tone mapping operator using a lookup table.
To improve the quality of synthetic video sequences, we introduce
a coding scheme for discrete cosine transform (DCT) blocks with
high contrast. We demonstrate the capabilities of HDR video in
a player, which enables decoding, tone mapping, and applying
post-processing effects in real-time. The tone mapping algorithm as well
as its parameters can be changed interactively while the video is playing.
We can simulate post-processing
effects such as glare, night vision, and motion blur, which appear
very realistic due to the usage of HDR data.
