Patent
High dynamic range tone mapping
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TLDR
In this article, a tone mapping system that generates a base layer by filtering a frame in an HDR video is described, which is then used to generate a tone curve using tone mapping parameters derived from the base layer.Abstract:
Embodiments herein disclose a tone mapping system that generates a base layer by filtering a frame in an HDR video. The tone mapping system then generates a tone curve using a tone mapping parameter derived from the base layer—e.g., a mean or maximum luminance value. Once the tone curve parameter is identified, the system performs temporal filtering to smooth out inconsistencies between the current value of the tone curve parameter and the values of tone curve parameter of at least one previous frame in the HDR video. The tone mapping system applies the temporally filtered tone curve to the base layer to generate a temporally coherent layer. The temporally coherent base layer can be combined with a detail layer derived from the HDR video to generate a frame of a tone mapped video.read more
Citations
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References
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TL;DR: Eleven tone-mapping operators intended for video processing are analyzed and evaluated with camera-captured and computer-generated high-dynamic-range content to identify the operators that can be expected to perform better than the others and to assess the magnitude of differences between the best performing operators.
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TL;DR: This work revisits the commonly used spatial base-detail layer decomposition and extends it to the temporal domain to achieve high quality spatiotemporal edge-aware filtering efficiently by using a mathematically justified iterative approach that approximates a global solution.