Browse Prior Art Database

DIAGNOSTIC VERIFICATION OF VIDEO PROCESSING HARDWARE

IP.com Disclosure Number: IPCOM000026208D
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 83K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electronic reprographic system having an Image Input Terminal (IIT) which directly feeds image data to video processing hardware, there is a need for a diagnostic technique which would assist in isolating faulty video processing components within the IIT. In general, the onboard tests utilized for such systems run under microprocessor control and therefore never operate the hardware components of the system at their normal operational bandwidth. Noise-related and transient type faults may only appear at the higher operational bandwidth, while other faults may occur only in the environment of an operational scan, especially when motors are actuated.

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XEROX DISCLOSURE JOURNAL

DIAGNOSTIC VERIFICATION OF Proposed Classification VIDEO PROCESSING HARDWARE US. C1.358/405 Robert S. Hamilton
Stephen W. Kennard
Jack T. Latone

Int. C1. H04n 51225

In an electronic reprographic system having an Image Input Terminal (IIT) which directly feeds image data to video processing hardware, there is a need for a diagnostic technique which would assist in isolating faulty video processing components within the IIT. In general, the onboard tests utilized for such systems run under microprocessor control and therefore never operate the hardware components of the system at their normal operational bandwidth. Noise-related and transient type faults may only appear at the higher operational bandwidth, while other faults may occur only in the environment of an operational scan, especially when motors are actuated.

The present invention is a diagnostic method intended to operate the system in a mode as close to a normal operational scan as possible. Accordingly, the diagnostic test verifies data integrity of the video input path at E normal operational bandwidth within the confines of a regular scanning cycle. More specifically, the diagnostic test exercises all paths, including hardware and control software, that a normal scan operation would use. A series of ten subtests are used to assist in the isolation of the faults to a specific hardware and/or software component. The tests are executed by setting the system to an appropriate scan...