Patent Document ID: 5510896
Application ID: 08077904
Patent Status: 1

Claim One:
1. A method of calibrating a digital copying machine including a scanner subsystem, a printer subsystem, and a processor subsystem having at least one CPU and storage means, the method comprising the steps of: (a) storing electronic values relating to a known original image into a first memory of the processor subsystem; (b) scanning the known original using the scanner subsystem, generating an electronic scanned image representation in a temporary second memory; (c) comparing contents of the first memory with contents of the second memory to determine error coefficients using the processor subsystem; (d) adjusting scanning parameters to calibrate the scanner subsystem based on error coefficients determined in step (c); (e) obtaining an electronic test print image of a second known original in a third memory; (f) printing a copy of a known original with the printer subsystem; (g) scanning the copy printed in step (f) using the scanning subsystem calibrated in step (d), generating a scanned electronic image representation in the temporary second memory; (h) comparing contents of the third memory with contents of the second memory to determine error coefficients using the processor subsystem; and (i) adjusting printing parameters to calibrate the printer subsystem based on error coefficients determined in step (h).