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High dynamic range tone mapping

A high dynamic range, tone-mapping technology, used in brightness and chrominance signal processing circuits, image analysis, image enhancement, etc.

Active Publication Date: 2017-03-15
DISNEY ENTERPRISES INC +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The range of colors in HDR video may exceed the range of colors that can be output by the display device

Method used

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Embodiment Construction

[0014] Temporal coherency has been a longstanding problem with tone mapping techniques for HDR video. In general, temporal continuity describes how continuous the tone mapping performed on a single frame of HDR video is from one frame to the next. The lack of temporal continuity in tone-mapped content often manifests itself as sudden brightness changes (eg, flashes) between successive frames that are perceivable by the human eye. These flashes limit the use of video tone mapping. US Patent Application 14 / 121,091, entitled "Temporal Continuous Local Tone Mapping of High Dynamic Range Video," which is incorporated herein by reference, describes techniques for performing local video tone mapping in a temporally continuous manner. Embodiments herein describe techniques for performing tone mapping that may require relatively few computational resources.

[0015] In one embodiment, a tone mapping system generates a base layer by filtering frames in HDR video. The tone mapping par...

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Abstract

The invention relates to high dynamic range tone mapping. 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.

Description

technical field [0001] Embodiments presented in this disclosure generally relate to performing tone mapping for high dynamic range (HDR) video. Background technique [0002] Tone mapping is typically performed prior to outputting HDR video on display devices that do not support high dynamic color range (eg, monitors, televisions, displays on mobile devices, etc.). The range of colors in HDR video may exceed the range of colors that can be output by the display device. As such, tone mapping converts frames in the HDR video to corresponding frames within the color range of the display device. In addition, tone mapping can adjust the brightness level captured by the camera (which generates HDR video) to match the capabilities of the display device outputting the video. Contents of the invention [0003] Embodiments herein describe a method comprising generating a base layer using frames of HDR video and deriving tone curve parameters from the base layer. The method include...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/40H04N23/76
CPCG06T2207/20024G06T2207/10016G06T2207/20208G06T2207/20182H04N1/4072G06T5/92H04N23/741H04N25/57G06T5/50H04N9/77
Inventor 阿廖沙·阿列克斯基·安德烈·斯莫列克图恩可·奥桑·艾丁西蒙尼·毛里西奥·科尔奇尼库斯·斯特法罗斯基
Owner DISNEY ENTERPRISES INC
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