Making complex data simple and compelling
From digital device to digital evidence
Unlock your vehicle's digital evidence potential
Forensic Analysis and Enhancement
Investigating and analyzing financial records
Gain access to the online accounts of deceased loved ones
Clear, precise evidence for a messy world
Expert reports to suit your specific needs
We can locate people anywhere
Stop worrying and learn the truth
Prevent, Detect, Respond To Cyberattacks
First response is crucial. Every minute counts.
The first response is critical to reduce liability
Detection & Removing Spyware Services
Reduce your electronic risk from digital transmittals
Find out who you are really talking to
Experienced, Confidential Services
Swift, professional incident response
Complicated cases require compelling digital facts
Find, recover and document digital evidence
Bring solid evidence before a judge
Cases can be investigated using Social Media
Divorce, custody battles, and other
Win the most important battle of your life
Everything you need
Effective Expert Witness in Court
Evidence shows who is telling the truth
Subpoena power yields strong evidence
Digital evidence can build a strong defense
Go to court with compelling digital evidence
One of the most common digital photo modifications is adding something to the original. But sometimes bad guys need to remove objects from a photo. And different graphic editors can help them with it. A user can even don’t have any experience of using them – everything can be done automatically. Even if a piece of such software can’t do modification automatically, there are lots of tutorials in the Web that can help our bad guys to do it manually. The most common technique for removing unwanted objects is cloning parts of the image near it. Sometimes cloned fragments need to be scaled or or their brightness and contrast need to be modified in order cloned object to match the main background.
The main technique used by forensic professionals here is called clone detection.
Different forgery detection suites contain utilities capable of clone detection. For example, you can use Amped Authenticate , or MATLAB Code written in Image and Communication Lab and available publicly.
Ok, let’s check some practical examples. This one is created by amateur photoshopper:
One of available clone detection algorithms shows the following result (matched parts are circled in red):
The other algorithm shows different results, some are false positives (matched parts connected with lines):
And here is the result of manual visual examination of the digital image (matched parts circled with colour):
Curious reader can keep playing “find 10 matches” game, and compare his or her results with the original image after :
To detect forgery it’s enough to find at least one cloned object. Both algorithms have solved the problem. But they couldn’t identify every trace of forgery. What if master of photoshop plays the game?
To find all problem parts clone detection algorithms must count scaling, rotation, flipping and changing of colour and brightness. As you can see, such algorithm will take a lot of computing resources. So now an examiner shouldn’t forget about the computer system he or she has.
Interests: Digital Video Forensics, Forgery Detection, Audio Forensics
Interests: Computer, Cell Phone & Chip-Off Forensics
Interests: iOS forensics, Android forensics, Mac OS X forensics, Windows forensics, Linux forensics
Please enter the result of the calculation above.
Save my name, email, and website in this browser for the next time I comment.
Speak to a Specialist Now
Get Help Now