Patent Number: 6,169,821

Title: Picture coder, picture decoder, and picture transmission system

Abstract: A transmission system transmits a series of coded frames from a transmitting device to a receiving device, using both intra-frame coding and inter-frame coding. The receiving device decodes the frames and sends acknowledgment signals to the transmitting device. The transmitting device selects the reference frame employed in inter-frame coding according to these acknowledgment signals. The method of reference frame selection can be varied according to an assessment of transmission channel quality. The assessment criteria, or the reference frame selection method itself, can be varied in response to input from a human user.

Inventors: Fukunaga; Shigeru (Tokyo, JP), Nakai; Toshihisa (Tokyo, JP)

Assignee: Oki Electric Industry Co., Ltd.

International Classification: G06T 9/00 (20060101); H04N 7/24 (20060101); H04N 7/64 (20060101); H04N 7/36 (20060101); H04N 7/26 (20060101); H04N 7/50 (20060101); G06K 009/00 ()

Expiration Date: 01/02/2018