RetouchPRO

Go Back   RetouchPRO > Technique > Forensic and Technical Imaging
Register Blogs FAQ Site Nav Search Today's Posts Mark Forums Read


Forensic and Technical Imaging Legal, medical, scientific, and forensic imaging techniques.

Researcher's Analysis of al Qaeda Images Reveals Surprises

Reply
 
Thread Tools
  #1  
Old 08-03-2007, 11:24 AM
Doug Nelson's Avatar
Doug Nelson Doug Nelson is offline
Janitor
 
Join Date: Aug 2001
Posts: 7,068
Blog Entries: 21
Researcher's Analysis of al Qaeda Images Reveals Surprises

I actually understand very little of this, but it's fascinating just the same
http://blog.wired.com/27bstroke6/200...chers-ana.html
Reply With Quote top
  #2  
Old 08-03-2007, 02:04 PM
Swampy's Avatar
Swampy Swampy is offline
Senior Member
 
Join Date: Feb 2005
Location: The Swamps of Florida
Posts: 4,418
Re: Researcher's Analysis of al Qaeda Images Reveals Surprises

Very interesting indeed. I have become very sceptical about the aunthenticity of news photos since the editing that was done by Sports Illustrated many years ago at the time of the Olympics (perhaps Barcelona?). It's been a long time, but it was the women's relay race where one of the USA track "stars" fell in the latter portion of her relay lap. The photo, as originally shot, showed the baton projecting from between her legs like a huge penis. The version that ran in SI had the baton edited out. SI did run a retraction explaining that they felt the photo "was less offensive" as edited.
Reply With Quote top
  #3  
Old 10-20-2007, 03:27 PM
Jafo's Avatar
Jafo Jafo is offline
Junior Member
 
Join Date: Aug 2006
Location: Orlando, FL
Posts: 9
Re: Researcher's Analysis of al Qaeda Images Reveals Surprises

I read the article and love the idea. The article links to the source code for the program that does the analasys:

http://blog.wired.com/27bstroke6/files/jpegquality.txt

But, sadly, I don't know how to compile it.
This is a general request either for the information of how to compile this, or for a version compiled for WinXP platform.
Reply With Quote top
  #4  
Old 10-21-2007, 05:12 PM
Jafo's Avatar
Jafo Jafo is offline
Junior Member
 
Join Date: Aug 2006
Location: Orlando, FL
Posts: 9
Re: Researcher's Analysis of al Qaeda Images Reveals Surprises

Well, I got the program to compile, but all it really does it print out quantization tables for both luminance and chrominance. Then it averages the two error percentages and gives the user an overall estimation of the quality in percent.

Not sure how the user is supposed to use that information, really.

Quote:
#File: d3f2f66e9a7c6da98602f782e425ae2d63e608a6.jpg

Quantization table
Precision=0; Table index=0 (luminance)
6 4 4 4 5 4 6 5
5 6 9 6 5 6 9 11
8 6 6 8 11 12 10 10
11 10 10 12 16 12 12 12
12 12 12 16 12 12 12 12
12 12 12 12 12 12 12 12
12 12 12 12 12 12 12 12
12 12 12 12 12 12 12 12
Estimated quality level = 89.79%
Precision=0; Table index=1 (chrominance)
7 7 7 13 12 13 24 16
16 24 20 14 14 14 20 20
14 14 14 14 20 17 12 12
12 12 12 17 17 12 12 12
12 12 12 17 12 12 12 12
12 12 12 12 12 12 12 12
12 12 12 12 12 12 12 12
12 12 12 12 12 12 12 12
Estimated quality level = 86.57%
Average quality: 90.80% (91%)
Reply With Quote top
Reply

  RetouchPRO > Technique > Forensic and Technical Imaging


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Resizing images for RetouchPRO jeaniesa Photo Retouching 19 11-05-2016 09:28 PM
Reconsidering 16 bit Ed_L Input/Output/Workflow 14 11-01-2005 10:41 AM


All times are GMT -6. The time now is 11:28 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
SEO by vBSEO ©2011, Crawlability, Inc.
Copyright © 2016 Doug Nelson. All Rights Reserved