Patent ReferencesApparatus for band compression processing of a picture signal Method for transmitting a high-resolution image over a narrow-band communication channel 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 Encoder capable of faithfully and adaptively encoding a moving image Method and apparatus for encoding transmitting and receiving image by pulse code modulation Video encoding apparatus including movement compensation Method of coding video signals Patent #: 4894713 InventorsAssigneeApplicationNo. 397207 filed on 08/22/1989US Classes:375/240.03QuantizationExaminersPrimary: Peng, John K.Attorney, Agent or FirmForeign Patent References
International ClassesH04N 007/18H04N 007/12 Foreign Application Priority Data1988-08-22 JPAbstractAn 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
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