Embedding frame masks in a video stream

A computing device comprising:

• memory;
• one or more hardware processors coupled to the memory;
• and
• one or more non-transitory computer-readable storage media storing instructions that, when loaded into the memory, cause the one or more hardware processors to perform operations comprising:
• encoding a frame of video data comprising an array of pixels to generate an encoded video frame, wherein the array of pixels comprise foreground pixels and background pixels;
• and
• transmitting the encoded video frame to a video decoder;
• wherein the foreground pixels have respective first chroma component values, wherein the first chroma component values are bounded within a first chroma component range;
• wherein encoding the frame of video data comprises converting the first chroma component values of the foreground pixels to second chroma component values by applying a mapping function, wherein the second chroma component values are bounded within a second chroma component range, and wherein the second chroma component range is shifted or compressed from the first chroma component range, wherein both the first chroma component range and the second chroma component range are subranges of a full range of a selected chroma component in a color space.

One or more non-transitory computer-readable media having encoded thereon computer-executable instructions causing one or more processors to perform a method, comprising:

• encoding a frame of video data comprising an array of pixels to generate an encoded video frame, wherein the array of pixels comprise foreground pixels and background pixels;
• and
• transmitting the encoded video frame to a video decoder;
• wherein the foreground pixels have respective first chroma component values, wherein the first chroma component values are bounded within a first chroma component range;
• wherein encoding the frame of video data comprises converting the first chroma component values of the foreground pixels to second chroma component values by applying a mapping function, wherein the second chroma component values are bounded within a second chroma component range, and wherein the second chroma component range is shifted or compressed from the first chroma component range, wherein both the first chroma component range and the second chroma component range are subranges of a full range of a selected chroma component in a color space.