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Browse Prior Art Database

SCANNER FOR REDUCING IMAGE BLUR

IP.com Disclosure Number: IPCOM000026905D
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07
Document File: 8 page(s) / 425K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present disclosure is directed to a scanner for reducing image blur due to motion when reading image data. More particularly, the disclosure is directed to an asynchronous scanner that utilizes a stroboscopic light source having a varying or constant strobing frequency and a varying or constant number of strobe cycles in a single strobing operation. In conventional scanners, a document is illuminated by a light source in a continuous manner while a CCD array is passed along the document to receive image data from each scanline. In other words, the document remains illuminated while the CCD array moves from one scanline to another scanline. Such a process can cause image blur due to motion, caused by a residual charge on the CCD array from a scanline before the CCD array reads the desired scanline. This charge is usually formed by light received when the CCD array in between scanlines. To ensure a sharp image, the residual charge should either be prevented or removed before reading the desired scanline.

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Page 1 of 8

XEROX DISCLOSURE JOURNAL

SCANNER FOR REDUCING IMAGE BLUR U.S. C1.358/075 Theresa C. Broderick

Proposed Classification

Int. C1. H04n 01/46

I

11 I \I

I I

I

LIGHT SOURCE

  AND CCD ARRAY

Y- I

4 SLOW SCAN kkPLliTEN

I

1 1 I

10 I

I I

FlG.2

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994 165

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

Page 2 of 8

SCANNER FOR REDUCING IMAGE BLUR(Cont'd)

SOURCE ARRAY

I

SENSOR

21 L3 )I 24L I

  STROBE CONTROLLER

SLOW

DRIVER

NETWORK

TRANSFER

RATE

 SCANNER CONTROLLER

t

FIG. 3

REFLECTIVITY DATA

F:: (B) STROBE ri

CIRCUIT

102

101

u

100

FIG. 4

166 XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcWApril 1994

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

Page 3 of 8

SCANNER FOR REDUCING IMAGE BLUR(Cont'd)

(A) '

I I I I I I I II I I I I I I I I II I

I I

SCAN ON SCAN ON

I I

I I I I I I I II I I I I I I I I II I

-

(3)

-

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 2 MarcldApril 1994 167

FIG. 5

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

Page 4 of 8

SCANNER FOR REDUCING IMAGE BLUR(Cont'd)

The present disclosure is directed to a scanner for reducing image blur due to motion when reading image data. More particularly, the disclosure is directed to an asynchronous scanner that utilizes a stroboscopic light source having a varying or constant strobing frequency and a varying or constant number of strobe cycles in a single strobing operation. In conventional scanners, a document is illuminated by a light source in a continuous manner while a CCD array is passed along the document to receive image data from each scanline. In other words, the document remains illuminated while the CCD array moves from one scanline to another scanline. Such a process can cause image blur due to motion, caused by a residual charge on the CCD array from a scanline before the CCD array reads the desired scanline. This charge is usually formed by light received when the CCD array in between scanlines. To ensure a sharp image, the residual charge should either be prevented or removed before reading the desired scanline.

One object of the present disclosure, therefore, is to describe a scanner that significantly reduces image blur due to motion when producing image data from a document in a noncontinuous manner. One aspect of the disclosed scanner is a circuit for strobing an image reader connected to a network. Accordingly, the scanner includes a scanner controller for controlling the operations of an image reader and a light source for stroboscopically illuminating the image to be read. An image reading device receives light reflected or transmitted from the image being read and outputs an electronic signal to the network corresponding to the received light. A strobe controller controls the strobing frequency of the light source and the number of strobe cycles in a strobing operation wherein the strobing operation is the completion of at least one strobe cycle. The scanner controller receives data indicating a rate for...