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Based on the empirical values in the stream returned by the grabbers, we can observe that the captured HDR signal has a quite reduced maximum brightness. For the RGB range [0-255] it is most often below 150-160 for HDR. Using this fact, we can implement automatic detection of the HDR / SDR signal by:
allowing the user to configure the limit/threshold value above which we consider the signal to be SDR
allowing the user to configure the switching time from SDR to HDR if the value does not exceed this threshold during this period (reason: dark scenes may generate a false signal, therefore the time interval is necessary)
switching from HDR to SDR will occur immediately because we can immediately detect the value above the critical threshold.
The above mechanism will control turning on/off HyperHDR tone mapping.
To consider whether we scan each pixel or use a simple scanline (and its shape), which should be faster, although it has side effects.
This will be implemented first for USB grabbers and YUV/NV12 and probably MJPEG modes for Linux and Windows systems.
This could probably be extended with an external flatbuffer/protobuffer source, although at this stage it won't be my priority due to limited resources.
Due to differences in video stream handling and my limited resources, I do not currently foresee this functionality for macOS, at least for now.
The text was updated successfully, but these errors were encountered:
awawa-dev
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Automatic HDR (LLDV) / SDR signal detection and tone mapping control for HyperHDR
Automatic HDR (and Dolby Vision: LLDV) / SDR signal detection and tone mapping control for HyperHDR
Jan 26, 2024
Based on the empirical values in the stream returned by the grabbers, we can observe that the captured HDR signal has a quite reduced maximum brightness. For the RGB range [0-255] it is most often below 150-160 for HDR. Using this fact, we can implement automatic detection of the HDR / SDR signal by:
The above mechanism will control turning on/off HyperHDR tone mapping.
To consider whether we scan each pixel or use a simple scanline (and its shape), which should be faster, although it has side effects.
This will be implemented first for USB grabbers and YUV/NV12 and probably MJPEG modes for Linux and Windows systems.
This could probably be extended with an external flatbuffer/protobuffer source, although at this stage it won't be my priority due to limited resources.
Due to differences in video stream handling and my limited resources, I do not currently foresee this functionality for macOS, at least for now.
The text was updated successfully, but these errors were encountered: