Image data storing device

• US 4,593,324 A
• Filed: 09/26/1985
• Issued: 06/03/1986
• Est. Priority Date: 04/14/1981
• Status: Expired due to Fees

• Current Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Kataoka, Hiroyuki, Ohkubo, Tetsuo
• Primary Examiner(s): Shaw, Gareth D.
• Assistant Examiner(s): Mills, John G.
• Application Number:
  US06/780,241
• Time in Patent Office: 250 Days
• Field of Search: 364/200, 364/900, 358/261
• US Class Current: 358/444
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0656 Data buffering arrangements
• CPC Class Codes: G06T 9/005 Statistical coding, e.g. Huffman, run length coding
• CPC Class Codes: H04N 1/2175 with local image input

Abstract

An image data storing device according to the invention includes a data compression/expansion device between the main memory of a CPU and an auxiliary memory device, such that image data are transmitted between the main memory and the data compression/expansion device, while data which are obtained by compressing the image data are transmitted between the data compression/expansion device and the auxiliary memory device.

Claims

1. An image data storage system comprising a central processing unit connected to a main memory and connected to input/output devices, including:

an auxiliary data storage system having a magnetic storage disc, read/write control means for said magnetic storage disc and a disc controller;

a data compression/expansion device provided between said main memory and said auxiliary memory device, which compresses data by means of a one dimension run length coding technique with the compression rate of said compression/expansion device being selected according to the ratio between the data transfer rate from said memory to said compression/expansion device and the data transfer rate from said compression/expansion device to the storage media of said magnetic storage disc;

said auxiliary memory device comprising a pair of FIFO memories for transfer of data in either direction between said magnetic storage disc and said compression/expansion device;

wherein image data are transmitted between said main memory and said data compression/expansion device at the same time that compressed data which are obtained by compressing said image data are transmitted between said data compression/expansion device and said auxiliary memory device.

2. An image data storage device, comprising;

a CPU having a main memory, an auxiliary memory device including an auxiliary data storage system having a magnetic storage disc, read/write control means for said magnetic storage disc and a disc controller, and a data compression/expansion device provided between said main memory and said auxiliary device for compressing data by one-dimensional run length coding, wherein image data are transmitted between said main memory and said data compression/expansion device, while data which are obtained by compressing said image data are transmitted between said data compression/expansion device and said auxiliary memory device, said auxiliary memory device, said auxiliary memory device comprising a pair FIFO memories for transfer of data in either direction between said magnetic storage disc and said compression/expansion device.

3. An image data storage device, comprising;

a CPU having a main memory, an auxiliary memory device including an auxiliary data storage system having a magnetic storage disc, read/write control means for said magnetic storage disc and a disc controller, and a data compression/expansion device provided between said main memory and said auxiliary device for compressing data by two-dimensional run length coding, wherein image data are transmitted between said main memory and said data compression/expansion device, while data which are obtained by compressing said image data are transmitted between said data compression/expansion device and said auxiliary memory device, said auxiliary memory device, said auxiliary memory device comprising a pair FIFO memories for transfer of data in either direction between said magnetic storage disc and said compression/expansion device.