Martin E Hoover

US Patent:

6525751, Feb 25, 2003

Filed:

May 25, 2001

Appl. No.:

09/865380

Inventors:

Martin E. Hoover - Rochester NY

Assignee:

Xerox Corporation - Stamford CT

International Classification:

B41J 2385

US Classification:

347116, 347234, 347248

Abstract:

A method and apparatus is presented for registering a plurality of color images formed on a photoconductive surface in a process direction. According to one embodiment of the invention, the registration simplified by the use of a method that does not require the use of a controller having a divide function. According to another embodiment of the invention, an apparatus is presented to compensate for variations in distances between a rotating polygon and a sensor detecting a position of a photoconductive member.

US Patent:

6909516, Jun 21, 2005

Filed:

Oct 20, 2000

Appl. No.:

09/692336

Inventors:

Martin E. Hoover - Rochester NY, US

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G01B011/04

US Classification:

356615, 347116, 347250, 399301

Abstract:

A simplified system for sensing the movement and/or position on both axes of a moving surface, such as a photoreceptor belt of a xerographic printer, or a sheet transport of an ink jet printer, utilizing a linear track of small and closely spaced “Z” shaped marks on or in a moving belt or roller surface. These marks are used to accurately incrementally directly detect surface motions in both orthogonal axes with a co-linear optical sensor linear array of a multiplicity of individual pixel optical detectors which respectively detect and compare the changes in positions relative thereto of the transverse and angled lines of those Z marks during frequent short measurement intervals. This exemplary system provides direct, and thus more accurate, surface movement measurement information, with much less critical and less costly marking requirements, and greater tolerance for variations in the subject surface, as compared to indirect or conventional encoder type positional sensors.

US Patent:

7467838, Dec 23, 2008

Filed:

Oct 17, 2006

Appl. No.:

11/581916

Inventors:

Jeffrey J. Folkins - Rochester NY, US
Daniel Warren Costanza - Fairport NY, US
David Allen Mantell - Rochester NY, US
Gregg Anthony Guarino - Rochester NY, US
Martin Edward Hoover - Rochester NY, US
Abu Saeed Islam - Rochester NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

B41J 29/38

US Classification:

347 14, 347 19, 347116

Abstract:

An apparatus compensates for mechanical disturbances during a print process by adjusting the generation of image generating head actuation signals in anticipation of a mechanical disturbance. The apparatus includes a printer controller for generating signals to coordinate movement of components with a rotating image receiver in a printer and for generating data identifying a process disturbance arising from interaction of the rotating image receiver with the components and an expected time for the process disturbance, a process disturbance compensator for generating a process disturbance compensation signal that corresponds to the process disturbance identification and timing data, and an image generating head controller for adjusting an image generating head actuation signal with the process disturbance compensation signal.

US Patent:

7510256, Mar 31, 2009

Filed:

Mar 30, 2005

Appl. No.:

11/092677

Inventors:

Gregg A. Guarino - Rochester NY, US
Daniel W. Costanza - Webster NY, US
Martin E. Hoover - Rochester NY, US
James P. Calamita - Spencerport NY, US
Abu S. Islam - Rochester NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

B41J 29/393

US Classification:

347 19

Abstract:

A reflex printing device having multiple print heads mounted at different locations around the circumference of the drum at different “angles” and an encoder disk mounted on the drum to allow for detection of the drum position as a function of time. An image defect due to a misalignment in the print process direction of the output from the multiple print heads is corrected by detection of an encoder position error function subtracted from itself shifted by the angle between the print heads.

US Patent:

7547903, Jun 16, 2009

Filed:

Nov 14, 2007

Appl. No.:

11/939815

Inventors:

Howard A. Mizes - Pittsford NY, US
Jack Lestrange - Macedon NY, US
Martin Edward Hoover - Rochester NY, US
Steven R. Moore - Pittsford NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G01N 21/86
B41J 29/393

US Classification:

2505591, 347 19

Abstract:

Disclosed is a method and system for calibrating an image capturing sensor. The method and system include generating a test pattern on an image receiving device and measuring one or more colorimetric properties of the test pattern with an image sensor. The disclosed method and system measure the test pattern with the image sensor located in two or more different cross-process positions to determine an independent uniformity profile for the image sensor and the image rendering process.

US Patent:

8064102, Nov 22, 2011

Filed:

Jul 1, 2010

Appl. No.:

12/828744

Inventors:

Yonghui Zhao - Penfield NY, US
Zhigang Fan - Webster NY, US
Martin E. Hoover - Rochester NY, US
Danield A. Robbins - Williamson NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

H04N 1/44
H04N 1/50
H04N 1/60
G06K 9/60
G06K 15/02
G06K 19/06
B41M 3/10
B41M 3/14
B42D 15/00
G07D 7/12

US Classification:

358 19, 358 328, 358509, 358518, 382100, 382191, 283 85, 283113, 283902, 235468

Abstract:

Embodiments are disclosed for generating an infrared mark indicator comprised of security information in a printed image. Image data is rendered to a CMYK image. A black plane of the CMYK image is separated and transformed to a frequency domain wherein the frequency components are alternated to encode the watermarking message. The CMY values are selected based on the encoded black value in order to maintain a same color appearance image for the printed image under a normal visual light illuminant. The image data is printed on the substrate in accordance with the transformed planes wherein upon the resultant printed image being exposed to infrared illuminant, a print pattern is detectable as an infrared mark when scanned with an infrared sensing device.

US Patent:

8203769, Jun 19, 2012

Filed:

Oct 10, 2008

Appl. No.:

12/249200

Inventors:

Robert Paul Herloski - Webster NY, US
Jagdish Tandon - Fairport NY, US
Martin Edward Hoover - Rochester NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

H04N 1/46

US Classification:

358505, 356300, 356319

Abstract:

A system for providing color analysis of a toner image on an image bearing surface with a spectrophotometer is provided. The system includes an illuminator positioned adjacent to the image bearing surface and configured to emit a light beam at the image bearing surface, a linear sensor positioned adjacent to the image bearing surface and configured to receive the light reflecting off the toner image on the image bearing surface, a gradient index lens placed in the optical path of the light beams reflecting off the image bearing surface between the image bearing surface and the linear variable filter; and the linear variable filter positioned between the linear sensor and the gradient index lens. The system is devoid of a collimating lens positioned in between the gradient index lens and the linear variable filter, and the linear variable filter and the linear sensor are spaced apart by a gap.

US Patent:

8261988, Sep 11, 2012

Filed:

Nov 30, 2009

Appl. No.:

12/627163

Inventors:

Yonghui Zhao - Penfield NY, US
Edward Chapman - Rochester NY, US
Martin E. Hoover - Rochester NY, US
Reiner Eschbach - Webster NY, US

Assignee:

Xerox Corporation - Norwalk CT

International Classification:

G06K 7/10

US Classification:

23546209, 23547203

Abstract:

A system reveals a 2D barcode in a document. A 2D barcode generator selects the placement and at least one colorant combination of an image and at least one colorant combination for a 2D barcode on a document, where the at least one colorant combination of the image and the 2D barcode form a metameric pair. A print system receives data from the 2D barcode generator and places the image and the 2D barcode on the document. A light source selected or tuned to a wavelength corresponding to the colorant combinations utilized by the print system reveals the 2D barcode placed thereon. A decoding element decodes and extracts data from the revealed 2D barcode.