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Browse Prior Art Database

RAM BASED CCD SENSITIVITY BALANCING DEVICE

IP.com Disclosure Number: IPCOM000026431D
Original Publication Date: 1991-Dec-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 101K

Publishing Venue

Xerox Disclosure Journal

Abstract

When reading data from a Charge Coupled Device (CCD) in an application such as digital information storage on microfilm, the varying sensitivities of the different elements of the CCD may lead to incorrect interpretation of the data. This invention discloses a hardware technique for correcting the differences between the CCD elements in a high speed implementation.

This text was extracted from a PDF file.
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Page 1 of 4

XEROX DISCLOSURE JOURNAL

CCD Clock

RAM BASED CCD SENSITIVITY BALANCING DEVICE US. C1.358/446
Thomas Robson

Proposed Classification

to DATA 01/40 H04n C1. Int. -~t

RAM

system for test

1 or 8 bits to system

1 or 8 bits from system

Address from system for parameter loadeing

Clock from system

CCD Output

I

Counter

-

-

FIG. I

XEROX DISCLOSURE JOURNAL - Vol16 No 6 NovembedDecember 1991 391

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

Page 2 of 4

RAM BASED CCD SENSITIVITY BALANCING DEVICE(Cont'd)

To system

I Data

RAM

CCD Clock b 16

Counter

To system

I

Address

- output 3

Comp.

RAM load from system

.

FIG. 2

392 XEROX DISCLOSURE JOURNAL - Vol16 No 6 NovembedDecember 1991

Endofscan

from CCD

I Fi::

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

Page 3 of 4

RAM BASED CCD SENSITIVITY BALANCING DEVICE(Cont'd)

When reading data from a Charge Coupled Device (CCD) in an application such as digital information storage on microfilm, the varying sensitivities of the different elements of the CCD may lead to incorrect interpretation of the data. This invention discloses a hardware technique for correcting the differences between the CCD elements in a high speed implementation.

Figure 1 shows system 10 whereby the data from the CCD is digitized by A to D converter 12 and used as one half of the address for RAM 14. Counter 16 keeps track of the element number and is the number used as the other half of the address for RAM 14. RAM 14 can either contain the corrected va...