| Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next


Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

Consciousness From Max Entropy; Democrats; Harvard Will Fix Black Poverty; Modelling Bicycle Wheels; Amusing Polling Outlier; If Labour keeps telling working class people...; Populism and Choice; Books on Defeat; Enrique Ferrari - Argentine Author; Transcript of German Scientists on Learning of Hiroshima; Calvert Journal; Telephone System Quotes for Cat Soft LLC; Owen Jones on Twitter; Telephone System Quotes for Cat Soft LLC; Possible Japanese Authors; Complex American Literature; Chutney v5; Weird Componentized Virus; Interesting Argentinian Author - Antonio Di Benedetto; Useful Thread on MetaPhysics; RAND on fighting online anarchy (2001); Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; NSA Hacked; Call Center Services for Cat Soft LLC; Very Good LRB Article on Brexit; Nussbaum on Anger; Credit Card Processing for Cat Soft LLC; Discover new movies on demand in our online cinema; Tasting; Credit Card Processing for Cat Soft LLC; Apple + Kiwi Jam; Hit Me; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Sudoku - CSP + Chaos; Recycling Electronics In Santiago; Vector Displays in OpenGL; Call Center Services for Cat Soft LLC; And Anti-Aliased; OpenGL - Render via Intermediate Texture; And Garmin Connect; Using Garmin Forerunner 230 With Linux; Payroll Service Quotes for Cat Soft LLC; (Beating Dead Horse) StackOverflow; Current State of Justice in China; Now Is Cat Soft LLC's Chance To Save Up To 32% On Mail; Axiom of Determinacy; Ewww; Fee Chaos Book; Course on Differential Geometry; Increase Efficiency with GPS Vehicle Tracking for Cat Soft LLC; Okay, but...; Sparse Matrices, Deep Learning; Sounds Bad; Applebaum Rape; Tomato Chutney v4; Have to add...; Culturally Liberal and Nothing More; Weird Finite / Infinite Result; Your diamond is a beaten up mess; Maths Books; Good Bike Route from Providencia / Las Condes to Panul\; Iain Pears (Author of Complex Plots); Plum Jam; Excellent; More Recently; For a moment I forgot StackOverflow sucked; A Few Weeks On...; Chilean Book Recommendations; How To Write Shared Libraries; Jenny Erpenbeck (Author); Dijkstra, Coins, Tables; Python libraries error on OpenSuse; Deserving Trump; And Smugness; McCloskey Economics Trilogy; cmocka - Mocks for C; Concept Creep (Americans); Futhark - OpenCL Language; Moved / Gone; Fan and USB issues; Burgers in Santiago; The Origin of Icosahedral Symmetry in Viruses; autoenum on PyPI; Jars Explains; Tomato Chutney v3; REST; US Elections and Gender: 24 Point Swing; PPPoE on OpenSuse Leap 42.1; SuperMicro X10SDV-TLN4F/F with Opensuse Leap 42.1; Big Data AI Could Be Very Bad Indeed....; Cornering; Postcapitalism (Paul Mason); Black Science Fiction; Git is not a CDN; Mining of Massive Data Sets; Rachel Kaadzi Ghansah; How great republics meet their end; Raspberry, Strawberry and Banana Jam; Interesting Dead Areas of Math; Later Taste; For Sale

© 2006-2015 Andrew Cooke (site) / post authors (content).

Detecting Tampering of Digital Images

From: "andrew cooke" <andrew@...>

Date: Sat, 24 Jul 2004 19:21:19 -0400 (CLT)

Intro - http://www.dartmouth.edu/~news/releases/2004/07/01.html

How Realistic is Photo-Realistic? (abstract only) -
http://www.cs.dartmouth.edu/~farid/publications/sp05b.html - we describe a
method for differentiating between photorealistic and photographic images.
Specifically, we show that a statistical model based on first- and
higher-order wavelet statistics reveals subtle but significant differences
between photorealistic and photographic images.

Exposing Digital Forgeries in Color Filter Array Interpolated Images
(abstract only) -
http://www.cs.dartmouth.edu/~farid/publications/sp05a.html - Most digital
cameras, for example, employ a single sensor in conjunction with a color
filter array (CFA), and then interpolate the missing color samples to
obtain a three channel color image. This interpolation introduces specific
correlations which are likely to be destroyed when tampering with an

Exposing Digital Forgeries by Detecting Traces of Re-sampling -
http://www.cs.dartmouth.edu/~farid/publications/sp04.html - we describe
how re-sampling (e.g.,~scaling or rotating) introduces specific
statistical correlations, and describe how these correlations can be
automatically detected in any portion of an image.

Statistical Tools for Digital Forensics -
http://www.cs.dartmouth.edu/~farid/publications/ih04.html - we quantify
statistical correlations that result from specific forms of digital
tampering, and devise detection schemes to reveal these correlations.

A Picture Tells a Thousand Lies (abstract only, New Scientist arcticle) -
http://www.cs.dartmouth.edu/~farid/publications/ns03.html - It had all the
hallmarks of a prizewinning war photograph. Under hostile fire, an armed
British soldier towered over an Iraqi man carrying a baby and directed him
to take cover. The composition was perfect. (you must remember this...)

Higher-Order Wavelet Statistics and their Application to Digital Forensics
- http://www.cs.dartmouth.edu/~farid/publications/sacv03.html - We
describe a statistical model for natural images that is built upon a
multi-scale wavelet decomposition. The model consists of first- and
higher-order statistics that capture certain statistical regularities of
natural images.

Detecting Digital Forgeries Using Bispectral Analysis - assume that in the
frequency domain a "natural" signal has weak higher-order statistical
correlations. We then show that "un-natural" correlations are introduced
if this signal is passed through a non-linearity (which would almost
surely occur in the creation of a forgery). Techniques from polyspectral
analysis are then used to detect the presence of these correlations.

From /. - http://slashdot.org/article.pl?sid=04/07/24/1459257


` __ _ __ ___  ___| |_____   work web site: http://www.ctio.noao.edu/~andrew
 / _` / _/ _ \/ _ \ / / -_)  personal web site: http://www.acooke.org
 \__,_\__\___/\___/_\_\___|  list: http://www.acooke.org/cute

compute mailing list

Comment on this post