Digital image processing device for enlarging original image wit

Details Digital image processing device for enlarging original image wit Digital image processing device for enlarging original image wit

1990-10-31

1992-11-03

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382 47, H04N 1393

Patent

active

051610353

ABSTRACT:
A digital image processing device for enlarging an original image with high fidelity. To produce digital data representative of an enlarged image based on digital data representative of an original image, 2-by-2 enlarged image data is firstly produced, for example, through computation of approximate surface representative of density distribution of the original image approximate to a surface covering all density values. Based on the 2-by-2 enlarged image data, another approximate surface covering all density values of control points selected from the pixels constituting the 2-by-2 enlarged image. Then, a center portion of the thus obtained approximate surface is enlarged to a desired size and four center portions of such enlarged approximate surface are obtained while selecting the control points on one pixel shifted positions in row and column on the 2-by-2 enlarged data. The thus obtained four center portions are averaged, which gives the image data representative of the enlarged image.

REFERENCES:
patent: 4084195 (1978-04-01), Pireira
patent: 4872064 (1989-10-01), Tutt et al.
patent: 4885786 (1989-12-01), Anderson et al.
patent: 4991004 (1991-02-01), Hayashi et al.
patent: 4991029 (1991-02-01), Motoki et al.

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