Video encoding and decoding apparatus

Details Video encoding and decoding apparatus Video encoding and decoding apparatus

1996-10-24

1999-12-14

Couso, Jose L.

Image analysis

Image compression or coding

Interframe coding

G06K 934

Patent

active

060028025

ABSTRACT:
An encoding apparatus comprising a encoder for encoding an input video signal, thereby generating encoded data, an output buffer for receiving the encoded data and outputting the data at a predetermined transmission rate, and an encoding control circuit for selecting a frame to be encoded. In the encoding control circuit, the target number of bits for each frame is calculated on the basis of the encoding bit rate, the encoding frame rate and the limits of delay, all of which are set externally. The number of encoded bits, thus calculated, is compared with the target number of encoded bits. A quantizer and a switch are controlled in accordance with the difference between the number of encoded code and the target number of encoded bits, thereby adjusting a quantization parameter and the number of frames which are to be skipped.

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Amy R. Reibman and Barry G. Haskell, "Constraints on Variable Bit-Rate Video for ATM Networks", Dec. 2, 1992, IEEE Transactions on Circuits and Systems for Video Technology, No. 4, New York; pp. 361-372.
Patent Abstracts of Japan vol. 095, No. 004, May 31, 1995 & JP 07 030589 A (Canon Inc.), Jan. 31, 1995 *abstract*.

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