Register to reply

Xerox devices randomly altering numbers

by nsaspook
Tags: altering, devices, numbers, randomly, xerox
Share this thread:
nsaspook
#1
Aug6-13, 03:11 PM
P: 642


http://www.dkriesel.com/en/blog/2013...when_scanning?

http://realbusinessatxerox.blogs.xer...T#.UgFXIiblAW2

Recently there have been articles about Xerox devices randomly altering numbers in scanned documents. We take this issue very seriously.
It's looks like compression hash collision errors.
Phys.Org News Partner Science news on Phys.org
Flapping baby birds give clues to origin of flight
Prions can trigger 'stuck' wine fermentations, researchers find
Socially-assistive robots help kids with autism learn by providing personalized prompts
DavidSnider
#2
Aug6-13, 04:52 PM
PF Gold
P: 469
Holy crap. I would have never imagined a xerox machine could make that sort of error. Their scanning algorithms must be pretty darn clever to even have that sort of bug.
jtbell
#3
Aug6-13, 05:07 PM
Mentor
jtbell's Avatar
P: 11,777
Those eunuch programmers have gotten too clever.

nsaspook
#4
Aug6-13, 07:24 PM
P: 642
Xerox devices randomly altering numbers

Quote Quote by jtbell View Post
Those eunuch programmers have gotten too clever.
They were very clever, to the point that saving document space became more important than document image integrity. Lossy compression should never be used when you expect the fidelity of the result to be a limited only by the resolution of the scanning process and the ability of the compression process to eliminate 'redundant' information. It's much better to see a blurry blob than a clear image that's completely wrong in any document scanning operation. Lossy compression usually goes beyond the 'redundant' and starts 'guessing' about different but similar patterns. In this case some numbers are deemed visually similar at some lossy compression ratio so it (the software classifier/comparator) selected a previously stored (seemly random) version to save space.
robphy
#5
Aug7-13, 04:35 AM
Sci Advisor
HW Helper
PF Gold
robphy's Avatar
P: 4,132
It also seems crazy that Xorex has known about the issue
(it's apparently in its user manual [ http://it.slashdot.org/comments.pl?s...5&cid=44485351 ] )
but made it a feature of the "Normal" option of "copying".
nsaspook
#6
Aug8-13, 09:05 PM
P: 642
http://www.cbronline.com/news/tech/h...software-error

They will have a patch to make 'normal' safe again.


Register to reply

Related Discussions
How do I randomly generate a set of numbers that sum up to one? Set Theory, Logic, Probability, Statistics 12
Next number in a sequence of randomly chosen numbers? General Math 12
Altering radioactive decay Nuclear Engineering 2
Futuristic Devices and Technology Innovations in Consumer Electronic Devices Computers 1
Altering the speed of light General Physics 305