Intelligent scaling of images stored in low-cost image buffers

Details Intelligent scaling of images stored in low-cost image buffers Intelligent scaling of images stored in low-cost image buffers

1997-09-23

1999-09-14

Boudreau, Leo H

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382166, 382262, 382264, 382300, 358525, G06K 932, G06K 940

Patent

active

059534648

ABSTRACT:
A method and apparatus for achieving an ultra-small or compressed image buffer images at half the resolution and then scales by two to achieve the device resolution. Acceptable quality can be maintained by identifying edge and interior portions of the page image and using this information to scale intelligently. A split-level frame buffer provides this identification of the image components. Further, an extension of block-truncation coding can be used with the split-level frame buffer to provide up to a 16 to 1 compression for an overall compression of up to 64 to 1. Actual techniques to scale these encodings are described along with new encodings for graphics and text designed this high compression of the image.

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