EP0473374A2
Expired / Lapsed
EP
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Image data processing
Assignee: Canon Inc
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Filing: 1991-08-23
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Granted: —
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Expires: 2011-08-23
Abstract
Abstract An image data encoding/decoding device has a memory (1) for parallel data input/output, a data input unit (6), a data output unit (7), an encoding unit (4), a decoding unit (5), and a memory control unit (9). Separate encoding and decoding units are employed to ensure efficient encoding/decoding operations. The image data are handled in serial form in the input, output, encoding and decoding units and in parallel formed only at the input to or output from the memory, so that these units can effect simultaneous parallel functions in mutually independent manner. Also efficient access to the memory is ensured by the memory control unit which handles simultaneous requests for access from various units according to a predetermined order of priority.
Inventors
- 👤 Yuji Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 09:18
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/00912; H04N1/00915; H04N1/32; H04N1/32561; H04N1/41; H04N1/411; H04N1/00127; H04N1/00204; H04N2201/00; H04N2201/0077; H04N2201/0081; H04N2201/0082; H04N2201/0087
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
An image data processing device, comprising: a memory unit having a capacity for storing image data of plural lines and adapted for input and output of parallel data; an input unit for receiving serial data and writing said data into said memory unit after serial-to-parallel conversion; an output unit for reading parallel data from said memory unit and releasing serial data by parallel-to-serial conversion of said parallel data; an encoding unit for reading image data of an encoding line from said memory unit, and effecting parallel-to-serial conversion and encoding process, and outputting code data; a decoding unit for receiving and analyzing code data, developing said code data into serial image data, and storing said serial image data in said memory unit after serial-to-parallel conversion; and a memory control unit for controlling the requests for access to said memory unit, generated by said input, output, encoding and decoding units.
Claim 2
Dependent Claim
54 words
An image data processing device according to claim 1, wherein said memory control unit is adapted, in case the requests for access to said memory unit are simultaneously generated by at least two of said input, output, encoding and decoding units, to control said requests for access according to a predetermined order of priority.
Claim 3
Dependent Claim
41 words
An image data processing device according to claim 1, wherein each of said input, output, encoding and decoding units is adapted to generate said request for access at every writing or reading of parallel data of a predetermined number of bits.
Claim 4
Dependent Claim
28 words
An image data processing device according to claim 1, wherein said input, output, encoding and decoding units are adapted to effect simultaneous parallel functions in mutually independent manner.
Claim 5
Dependent Claim
86 words
An image data processing device according to claim 1, further comprising a random access unit for receiving an arbitrary address of said memory unit and a signal indicating whether the access to said memory unit is for data reading or data writing, and for making access to said address of said memory unit, wherein said memory control unit is adapted to control the request for access from said random access unit in addition to the request for access from said input, output, encoding and deconding units.
Claim 6
Independent Claim
63 words
A method and apparatus for data processing, comprising a memory unit for storing image data, means for receiving serial image data, converting said serial data to parallel data and writing said parallel data to said memory unit, and an output unit for reading parallel data from said memory unit, converting said parallel data to serial data and supplying said data to an output.
Claim 7
Independent Claim
80 words
A method and apparatus for processing image data, comprising a memory unit for storing image data, an encoding unit for reading image data of an encoding line from said memory unit, effecting parallel to serial conversion, encoding said data and supplying said data to an output, and a decoding unit for receiving said coded data, developing said coded data into serial image data, converting said serial data to parallel data and storing said converted parallel data in said memory unit.
Claim 8
Independent Claim
64 words
A method and apparatus for processing image data, comprising a memory unit for storing image data and arranged to receive parallel data from an input and from a decoding unit, and arranged to supply parallel data to an output and to an encoding unit, and a memory control unit for controlling memory access requests, generated by said input, output, encoding unit and decoding unit.
Claim 9
Dependent Claim
49 words
A facsimile machine arranged to receive and transmit serial image data, including a memory device arranged to store parallel data and means for converting data from serial to parallel form for transfer to said memory and means for converting from parallel to serial form for transfers from said memory.
References Cited (Backward Citations)
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