Browse Prior Art Database

IMAGE RESOLUTION IMPROVEMENT CONTROL ALGORITHM

IP.com Disclosure Number: IPCOM000026169D
Original Publication Date: 1990-Aug-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 99K

Publishing Venue

Xerox Disclosure Journal

Abstract

A xerographic printing machine having the capability to output documents at a high resolution (600 spi) requires input documents of the same resolution, or a means for recognizing the lower resolution (300 spi) of the input document and modifying it to enable printing at the higher resolution. The figure illustrates the logical control algorithm used to implement the recognition and conversion of low resolution document images.

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XEROX DISCLOSURE JOURNAL

,HECK &ADJUST' ROS

IMAGE RESOLUTION IMPROVE- MENT CONTROL ALGORITHM Wilbert D. Douglas
Kathy
J. Batiste

Proposed Classification
U.S. C1.364B30.42 Int. C1. G06f 1/00

1 I DETERMINE 1 VIDEO FORMAT

k+

3* SPI ?

HARDWARE

L , SPI? 300 ':ho

P

"\ ges

RRORS? f

DECLARE

MINOR FAULT

DECLARE

XEROX DISCLOSURE JOURNAL - Vol. 15, No. 4 July/August 1990 277

I

No

IENABLE VIDEO

INPUT

[This page contains 1 picture or other non-text object]

Page 2 of 2

IMAGE RESOLUTION IMPROVEMENT CONTROL ALGORITHM( Cont'd)

A xerographic printing machine having the capability to output documents at a high resolution (600 spi) requires input documents of the same resolution, or a means for recognizing the lower resolution (300 spi) of the input document and modifying it to enable printing at the higher resolution. The figure illustrates the logical control algorithm used to implement the recognition and conversion of low resolution document images.

Specifically, the controller first determines the resolution of the incoming image at block 10. If the image is of a lower resolution (300 spi), a hardware interpolator is evoked, block 12, to interpolate the input image by a predetermined factor (2x). Alternatively, the controller passes the image to the output device after checking the status of the parallel interface (UF) to the output device, blocks 20 and 22. Block 24, signals the output device to indicate the pending video input and the raster output scanner (ROS) system is tes...