By: George Reis
Tel: (714) 775-3120
Email Mr. Reis
Website: www.imagingforensics.com.
It always surprises me how often retaining attorneys send me digital copies of scanned color laser prints of photos in PDF format, or transcoded video files to do an analysis. Sometimes these images resemble their originals - sometimes they are a far cry from them.
To do the best enhancement, analysis, or authentication possible, originals are needed. Exact, logical copies of digital evidence is fine if the originals are digital.
With photographs, the original is the digital file as it came from the camera, or the negative from a film camera. If it's a PDF, it is not the original.
With security digital video recorders, the original is an exact copy of the original data recorded by the DVR. If the file plays on a standard DVD player - it probably isn't the original.
Determining if the still photos or video files are originals does involve more than simply determining whether the video plays on a standard DVD player, or if the still image file is in a JPEG file format - but those are good starts.
Whether you are using an expert or not - start demanding exact copies of the original visual evidence in your cases - it will make a significant difference in what that evidence can tell you.
George Reis, of Imaging Forensics has provided expertise to Attorneys, Law Enforcement Agencies and Insurance Companies in the areas of Forensic Photography; Photographic Authentication, Enhancement and Analysis; and Forensic Video Analysis, for over twenty years. He also provides training in these fields.
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4/18/2010· Digital Forensics
COFEE And The State Of Digital Forensics
Computer Online Forensic Evidence Extractor (COFEE) is a software program developed by Microsoft for use by law enforcement. It was held closely by law enforcement for a period of time until it was revealed in the last year, and subsequently, several individuals released software intended to defeat the utility of COFEE.
4/18/2010· Digital Forensics
Moving Toward A Science Of Digital Forensic Evidence Examination
Like almost every scientific endeavor, the examination of digital forensic evidence (DFE) started out somewhere between an art and a craft. People with special skills and knowledge leverage that skill set and knowledge base to put forth notions about the meaning of DFE in the context of legal matters. While the court system greatly appreciates science and its role through expert testimony in providing probative information, that appreciation is substantially challenged by the lack of a scientific base, in the form of adequate peer reviewed publications associated with professional societies,
11/8/2011· Digital Forensics
Imaging Forensics: So, What's the Story on Resolution?
By: George Reis
My post on Synchronizing Video has generated a few comments related to image resolution. Three people, all of whom have a significant background in forensic imaging, have made rather divergent comments. Multiple topics are being addressed, from crime scene, accident and evidence photography to latent print photography to SWGFAST guidelines/requirements to the resolution of video security camera systems.
