Patent ID: 11967345
Assignee: GRASS VALLEY LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A system for rendering key and fill video streams for video processing, the system comprising:
a database configured to store video data including a sequence of images and alpha data defining transparency levels for each portion of each image in the sequence of images;
an encoder configured to encode each frame of the sequence of images to generate encoded composite frames that each contain a fill portion that corresponds to the video data and a key portion that is monochrome and defines transparency levels for each portion of the respective images, such that each encoded composite frame includes both the fill and key portions that are disposed horizontally and side-by side with respect to each other; and
a renderer configured to receive a stream of the encoded composite frames and having a single decoder that is configured to decode each encoded composite frame to extract pixel values from the fill portion and respective transparency levels from the key portion, and further configured to apply the respectively transparency levels to the corresponding extracted pixel values to generate a proxy of the respective frame to be displayed by a video processing device,
wherein the fill portion comprises a higher resolution than a resolution of the key portion, and
wherein the video processing device is one of a video editing device.