Image enlargement/reduction processor and method

Details Image enlargement/reduction processor and method Image enlargement/reduction processor and method

1991-03-29

1994-05-03

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382 47, H04N 1393

Patent

active

053092538

ABSTRACT:
A picture element conversion system consists of a simple electric circuit for reducing or enlarging an image at high quality. The system includes a cumulative adding unit for cumulatively adding a multiplying factor, in synchronization with clock signals, and outputting the added data and a carry signal. A contiguous picture element output unit temporarily holds a picture element data array along one of two scanning directions and outputs at least two contiguous picture element data. A typical value calculation unit divides a section defined by the contiguous picture element data into sub-sections and obtains typical values corresponding to each sub-section from the picture element data output from the contiguous picture element output unit. A typical value selecting unit selects and outputs only one value from among the typical values output from the typical value calculation unit in accordance with the added data of the cumulative adding means, and a control unit controls the contiguous picture element output unit and the cumulative adding unit in accordance with the carry signal and an externally supplied selection data to determine whether a reduction conversion or an enlargement conversion should be carried out.

REFERENCES:
patent: 4633503 (1986-12-01), Hinman
patent: 4878126 (1989-10-01), Ichikawa
patent: 4937677 (1990-06-01), van Dorsselaer

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