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US Patent 4972260 - Apparatus for coding a moving-picture signal
US Patent Issued on November 20, 1990
Estimated Patent Expiration Date:
August 22, 2009Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
Estimated Patent Expiration Date:
August 22, 2009Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.AbstractAn apparatus for coding a moving-picture signal comprises a first memory temporarily memorizing an input picture signal of one frame. A block of the picture signal, which corresponds to a central portion of the frame, is firstly read out from the first memory and then other blocks of the picture signal are sequentially read out from the first memory in a predetermined order. Each of the blocks of the picture signal has a predetermined number of adjacent pixels. A transform device transforms each block of the picture signal read out from the first memory into transmission information. A second memory stores the transmission information and has a capacity which adaptively varies with a position of the block relative to the frame. A quantizer adaptively quantizes an output from the transform device in accordance with a quantity of the transmission information stored in the second memory and with the position of the block relative to the frame.Other References
| InventorsAssigneeApplicationNo. 397207 filed on 08/22/1989US Classes:375/240.03QuantizationExaminersPrimary: Peng, John K.Attorney, Agent or FirmUS Patent References4668987, Apparatus for band compression processing of a picture signalIssued on: 05/26/1987 Inventor: Matsuda , et al.4672444, Method for transmitting a high-resolution image over a narrow-band communication channel Issued on: 06/09/1987 Inventor: Bergen , et al.4689672, Method and device of coding a digital video signal for reproduction of pictures with a high quality even upon occurrence of a drastical change between the pictures Issued on: 08/25/1987 Inventor: Furukawa , et al.4734767, Encoder capable of faithfully and adaptively encoding a moving image Issued on: 03/29/1988 Inventor: Kaneko , et al.4809067, Method and apparatus for encoding transmitting and receiving image by pulse code modulation Issued on: 02/28/1989 Inventor: Kikuchi , et al.4837632, Video encoding apparatus including movement compensation Issued on: 06/06/1989 Inventor: Kubo , et al.4894713Method of coding video signals Issued on: 01/16/1990 Inventor: Delogne, et al. Foreign Patent References
International ClassesH04N 007/18H04N 007/12 Foreign Application Priority Data1988-08-22 JP |
