TRANSMITTING AND RECEIVING A COMPOSITE IMAGE

摘要

For a video sequence having at least one composite image comprising a foreground and a transparency mask, a video encoder transmits the encoded foreground image and the encoded transparency mask together with a flag signifying whether or not the encoded transparency mask is to be decoded as a binary transparency mask. Clipping values may be signalled to the decoder for use in clipping of a decoded binary transparency mask.

主权项

1. A method of transmitting a composite image comprising at least a foreground image and a transparency mask, the method comprising the steps of:
encoding the foreground image in an encoder; encoding the transparency mask as an image in the encoder; and transmitting the encoded foreground image and the encoded transparency mask together with a flag signifying whether or not the encoded transparency mask is to be decoded as a binary transparency mask in which each pixel can take only two values.