Method for changing the resolution of compressed image data

Details Method for changing the resolution of compressed image data Method for changing the resolution of compressed image data

1984-07-06

1986-12-09

Ciarlante, Anthony V.

Image analysis

Histogram processing

For setting a threshold

382 47, 382 48, G06K 936

Patent

active

046285342

ABSTRACT:
A method is disclosed for changing the horizontal and vertical resolution of an image while the image is in digitized and compressed form, where the image is first scanned and digitized to be represented as a number of discrete picture elements (pixels) and then the digitized image data is compressed. To change the resolution of an image and thereby be able to display it in smaller or larger form, the compressed image data is first analyzed and the data for certain scan lines is replicated or eliminated to respectively increase or decrease the vertical resolution of the image by a selected vertical resolution change factor. Then the compressed image data with scan lines replicated or eliminated is further processed using a selected horizontal resolution change factor to increase or decrease the horizontal resolution by respectively increasing or decreasing the number of pixels representing each scan line. The image data may also be processed so that windowing on the image may be performed.

REFERENCES:
patent: 4499597 (1985-02-01), Alves
patent: 4513440 (1985-04-01), Delman
patent: 4517604 (1985-05-01), Lasher et al.
patent: 4528693 (1985-07-01), Pearson et al.
patent: 4566126 (1986-01-01), Miyagawa et al.

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