Abstract: Techniques are provided for spatially adaptive tone mapping with dynamic brightness control. A methodology implementing the techniques according to an embodiment includes converting luminance data, from a received HDR image, to a logarithm domain and decomposing the converted data into a base layer, and one or more detail layers. The method also includes adjusting the layers, through shifting and scaling of the base layer and scaling of the detail layers, to map the amplitude data into a selected range. The method further includes converting the adjusted layers from the logarithm domain to a linear domain and calculating a tone compression parameter based on statistics of the adjusted log domain base layer. The statistics are associated with brightness of the received image. The method further includes applying a global tone compression function, based on the tone compression parameter, to the converted linear domain base layer to generate compressed linear domain layers.

Abstract: Techniques are provided for spatially adaptive tone mapping with dynamic brightness control. A methodology implementing the techniques according to an embodiment includes converting luminance data, from a received HDR image, to a logarithm domain and decomposing the converted data into a base layer, and one or more detail layers. The method also includes adjusting the layers, through shifting and scaling of the base layer and scaling of the detail layers, to map the amplitude data into a selected range. The method further includes converting the adjusted layers from the logarithm domain to a linear domain and calculating a tone compression parameter based on statistics of the adjusted log domain base layer. The statistics are associated with brightness of the received image. The method further includes applying a global tone compression function, based on the tone compression parameter, to the converted linear domain base layer to generate compressed linear domain layers.

Abstract: Techniques are provided for temporal control of a spatially adaptive tone mapping (SATM). The techniques can be applied to a sequence of video images (e.g., high dynamic range (HDR) video). The temporal control may reduce flickering and other undesirable artifacts that can be introduced by SATM processing. An example system includes an SATM circuit configured to perform SATM on sequential image frames of an input video, to reduce the dynamic range of the video to a level suitable for display on a conventional (lower dynamic range) device. The SATM operation is based on frame parameters. The system also includes a parameter smoothing circuit configured to apply a smoothing filter to the parameters used on the current frame to generate a new set of parameters for use by the SATM circuit on the next frame. The system also includes an adaptation circuit to compress variation of SATM exposure correction over time.

Abstract: Techniques are provided for spatially adaptive tone mapping for display or reproduction of HDR images on devices with lower dynamic range capability. An example system may include a log-conversion circuit to convert luminance data, from a received image, to a logarithm domain. The system may also include an edge-aware filter circuit to decompose the log domain luminance data into a base layer, a small scale detail layer, and a large scale detail layer. The system may further include an amplitude adjustment circuit to shift and scale data amplitudes in each of the layers to a selected range and a linear-conversion circuit to convert the adjusted layers from the log domain back to the linear domain. The system may further include a tone compression circuit to generate compressed linear domain layers and a luminance data reconstruction circuit to generate compressed luminance data based on the compressed linear domain layers.