Newsletters
News & Information for Technology Purchasers NewsFactor Sites:       NewsFactor.com     Enterprise Security Today     CRM Daily     Business Report     Sci-Tech Today  
   
Home Enterprise I.T. Cloud Computing Applications Hardware More Topics...
Neustar, Inc.
Protect your website & network
using real-time information & analysis

www.neustar.biz
Hardware
Tame your scariest paperwork. Find Out How
Average Rating:
Rate this article:  
Some Xerox WorkCentre Copiers Alter Numbers on Scans
Some Xerox WorkCentre Copiers Alter Numbers on Scans

By Barry Levine
August 6, 2013 2:23PM

    Bookmark and Share
Xerox has confirmed that the problem on some WorkCentre models is related to how the JBIG2 image compression works on the scanner, because it looks for similar areas to compress and reuse throughout an image. Numbers in a small font are apparently being mistaken for the same information, and are thus being reused by the compression.
 

Related Topics

Xerox
Copier
Scanner
PDF
OCR



The term "xerox" has been used for decades to indicate an identical copy. But now a researcher has discovered that, in some cases, Xerox scanners are altering numbers on documents.

Last week, a PhD candidate at the University of Bonn posted several scans on his blog showing that numbers had been changed by the tested Xerox machines. The researcher, David Kriesel, said he used a Xerox WorkCentre machine to scan building floor plan documents in order to create PDFs. The documents contained construction drawings of rooms, each indicated by a box with a name and the area in square meters.

Kriesel reported that, when he scanned the documents as TIFFs, they came out as exact replicas, but problems emerged when he used image compression on a Xerox WorkCentre 7535 and a 7556. Instead of the rooms having the original dimensions, the rooms showed some dimensions repeated erroneously.

'A Lot Worse'

In the blog posting, Kriesel described the errors as being "a lot worse" than an optical character recognition problem. Instead, he said, "patches of the pixel data are randomly replaced in a very subtle and dangerous way." The scans look correct, Kriesel said, but the numbers may be incorrect.

Kriesel said the problem was compounded by the fact that it exists on different WorkCentre models, using the current software release, and Xerox appears to have been initially unaware of the issue until his report. He said he has received e-mails from other users of the same equipment and software who have encountered similar problems.

He indicated that there appears to be a relationship between font size and scan dpi in that he was able to reproduce the error for PDF scans at 200 dpi without OCR, using Arial 7-point and 8-point font sizes.

Xerox has recently confirmed his assessment that the problem is related to how the JBIG2 image compression works on the scanner, because it looks for similar areas to compress and reuse throughout an image. Numbers in a small font are apparently being mistaken for the same information, and are thus being reused by the compression.

Xerox's Assessment

On Tuesday, Xerox released a statement that said the problem appears to be a combination of compression level and resolution setting. The company said that the machines used by Kriesel "are shipped from the factory with a compression level and resolution that produces scanned files which are optimized for viewing or printing while maintaining a reasonable file size," and added that the defect may be the result of using lower quality and resolution settings.

At factory default settings, Xerox said, the character substitution issue does not occur, and it recommended that users employ the factory defaults with the quality level set to "higher." It also said that there had been warnings on the copier's Web site for years that noted character substitution could happen at lower quality and higher compression settings.

The JBIG2 compression setting is only used at the lowest quality setting, which the scanner describes as "normal." Xerox has said that the default setting is "high" but Kriesel said the machines he tested had default settings of "normal," which he believes had been set by the reseller.
 

Tell Us What You Think
Comment:

Name:



APC has an established a reputation for solid products that virtually pay for themselves upon installation. Who has time to spend worrying about system downtime? APC makes it easy for you to focus on business growth instead of business downtime with reliable data center systems and IT solutions. Learn more here.


 Hardware
1.   US Orders a New Cray for Nuclear Arms
2.   PC Shipment Slump Bottoms Out
3.   IBM Earmarks $3B for Next-Gen Chips
4.   Most Networks Not Ready for IoT
5.   Gartner Sees Tablets Up, PCs Down


advertisement
Most Networks Not Ready for IoT
But most enterprises are prepared.
Average Rating:
Gartner Sees Tablets Up, PCs Down
But PC sales are recovering.
Average Rating:
Review: Tablets with Keyboard Covers
How do Surface and Lumia stack up?
Average Rating:
Product Information and Resources for Technology You Can Use To Boost Your Business

Network Security Spotlight
Report: Chinese Hackers Hit U.S. Personnel Networks
Hackers from China broke into the computer networks of the U.S. Office of Personnel Management earlier this year with the intention of accessing the files of tens of thousands of federal employees.
 
Charges: Russian Stole Data from U.S. Restaurants, Zoo
A Russian man arrested on bank fraud and other charges hacked into computers at restaurants in Washington, hundreds of other retail businesses, and even the Phoenix Zoo, authorities say.
 
Another Month, Another IE-Focused Patch Tuesday
Microsoft rolled out 59 vulnerabilities for Internet Explorer in June. But the IE-patching party is not over yet. Redmond published six new security bulletins on Tuesday; two, critical; three, important.
 

Navigation
NewsFactor Network
Home/Top News | Enterprise I.T. | Cloud Computing | Applications | Hardware | Mobile Tech | Big Data | Communications
World Wide Web | Network Security | Data Storage | Small Business | Microsoft/Windows | Apple/Mac | Linux/Open Source | Personal Tech
Press Releases
NewsFactor Network Enterprise I.T. Sites
NewsFactor Technology News | Enterprise Security Today | CRM Daily

NewsFactor Business and Innovation Sites
Sci-Tech Today | NewsFactor Business Report

NewsFactor Services
FreeNewsFeed | Free Newsletters | XML/RSS Feed

About NewsFactor Network | How To Contact Us | Article Reprints | Careers @ NewsFactor | Services for PR Pros | Top Tech Wire | How To Advertise

Privacy Policy | Terms of Service
© Copyright 2000-2014 NewsFactor Network. All rights reserved. Article rating technology by Blogowogo. Member of Accuserve Ad Network.