Transitioning between video priority and graphics priority
A processor receives input video data of a video dynamic range and input dynamic metadata. It also receives: input graphics data of a graphics dynamic range and input static metadata, display identification data from a target display over a video interface, and a blending priority map characterizing a per-pixel priority of output pixels in an image generated by blending the input video data and the input graphics data. A video mapping function and a graphics mapping function which map data from the input video and graphics dynamic ranges to the target dynamic range are generated based on the dynamic and static metadata. Then, the input and graphics data are blended based on the blending priority map and a per-pixel decision to map pixels to the target dynamic range using either the video mapping function or the graphics mapping function.
1. In a video receiver, a method for blending graphics data with a processor, the method comprising:
receiving input video data and input dynamic metadata for the input video data, wherein the input video data is at a video dynamic range;
receiving input graphics data and input static metadata, wherein the input graphics data is at a graphics dynamic range;
receiving display identification data from a target display to which the video receiver is linked over a video interface;
receiving a blending priority map characterizing a per-pixel priority of output pixels in an image generated based on blending the input video data and the input graphics data;
blending the input video data and the input graphics data to generate blended video data; and
sending the blended video data to the target display for rendering the blended video data at a target dynamic range;
wherein blending the input video data and the input graphics data to generate blended video data comprises computing:
output( i )= a ( i )* R graphics( i )+(1 −a ( i ))* R video( i ),
wherein output(i) denotes an output pixel; Rvideo(i) denotes an input video pixel mapped to the target dynamic range based on a video tone-mapping function; Rgraphics(i) denotes an input graphics pixel mapped to the target dynamic range based on a graphics tone-mapping function, and a(i) denotes a blending value based on the blending priority map; i denotes a pixel index.
2. The method of claim 1 , wherein the display identification data from the target display specifies the target dynamic range of the target display.
3. The method of claim 1 , further comprising:
using the input dynamic metadata to generate the video tone-mapping function to map data from the input video dynamic range to output data in the target dynamic range;
using the input static metadata to generate the graphics tone-mapping function to map data from the input graphics dynamic range to output data in the target dynamic range.
4. The method of claim 1 , further comprising:
if the blending priority map defines the input pixel having a video priority, then the output pixel is generated by mapping the input pixel to the output pixel using the video tone-mapping function,
else the output pixel is generated by mapping the input pixel to the output pixel using the graphics tone-mapping function.
5. In a video receiver, a method for blending graphics data, the method comprising:
receiving input video data and input dynamic metadata for the input video data, wherein the input video data is at a video dynamic range;
receiving input graphics data and input static metadata wherein the input graphics data is at a graphics dynamic range;
receiving display identification data from a target display to which the video receiver is linked over a video interface;
receiving a blending priority map characterizing a per-pixel priority of output pixels in an image generated based on blending the input video data and the input graphics data; and
upon receiving from the target display indication that it supports per-pixel blending:
sending the input video data to the target display for rendering a blended version of the input video and graphics data at a target dynamic range;
wherein rendering a blended version of the input video and graphics data at a target dynamic range comprises computing:
output( i )= a ( i )* R graphics( i )+(1 −a ( i ))* R video( i ),
wherein output(i) denotes an output pixel; Rvideo(i) denotes an input video pixel mapped to the target dynamic range based on a video tone-mapping function; Rgraphics(i) denotes an input graphics pixel mapped to the target dynamic range based on a graphics tone-mapping function, and a(i) denotes a blending value based on the blending priority map; i denotes a pixel index.
6. The method of claim 5 , wherein the display identification data from the target display specifies the target dynamic range of the target display.
7. The method of claim 5 , further comprising:
using the input dynamic metadata data to generate a video tone-mapping function to map from the input video dynamic range to output data in the target dynamic range;
using the input static metadata data to generate a graphics tone-mapping function to map from the input graphics dynamic range to output data in the target dynamic range.
8. An apparatus comprising a processor and configured to perform the method recited in claim 1 .
9. An apparatus comprising a processor and configured to perform the method recited in claim 5 .
10. A non-transitory computer-readable storage medium having stored thereon computer-executable instruction for executing a method with one or more processors in accordance with claim 1 .
11. A non-transitory computer-readable storage medium having stored thereon computer-executable instruction for executing a method with one or more processors in accordance with claim 5 .