Nec Corporation

Hirohisa Shiojiri

Toshio Koga

A moving picture transmission system includes a transmission apparatus and a reception apparatus. The transmission apparatus transmits a maximum number of pieces of information obtained by hierarchically coding moving picture information in accordance with degrees of importance in terms of image quality within a moving picture frame period in the order of decreasing degrees of importance. The reception apparatus reproduces a moving picture frame in accordance with only hierarchically coded information received at a moving picture frame period. A moving picture transmission apparatus is also disclosed.

Moving picture transmission system and moving picture transmission apparatus used therein

A picture information transmission system enciphers and transmits picture information after interframe coding so that a receiving apparatus which does not have a cipher decoding device can decode and display the picture at an arbitrary time to allow potential customers to view the image for advertising purposes. The system is constructed so that coding is stopped for a predetermined period of time, and for one of a plurality of regions of each frame within the period, data are successively coded by intraframe coding before the data are outputted.

Picture information transmission system and picture coding and decoding

A method of adaptively multiplexing a plurality of video channel data is disclosed. A multiplexed data includes a plurality of frames each of which contains a plurality of sub-frames. The video channel data are adaptively allocated to the sub-frames. A memory occupancy value of a buffer, which is provided in each of a plurality of video channels, is determined. The buffer is arranged to receive the corresponding video information. A plurality of control signals are produced each of which indicates the memory occupancy value of the corresponding buffer. Following this, a look-up table is accessed which includes a plurality of video channel assignment data for assigning the video channel data to The sub-frames. Thus, one of the channel data assignment data is derived from the look-up table. The video channel data are then multiplexed using one of said channel data assignment data derived from the look-up table.

Growing community of inventors

Tokyo, Japan

Hirohisa Shiojiri