In a previous post entitled “Interpreting Video Images: The Role of the Forensic Video Analyst,” I discussed the important role that a forensic video analyst can play in providing expert…
Interpreting Video Images: The Role of the Forensic Video Analyst
Do you see what I see? Looking at video evidence does not mean that you will actually see all that the video has to offer. Expert interpretation of video evidence…
Image Comparison Evidence: The Canadian Experience
Image comparison evidence has been used frequently in Canadian courts where favorable rulings have been made on the use of such evidence in identifying vehicles, clothing and other objects, and…
Image Comparison Evidence: The United States Experience
Image comparison evidence can be a very powerful form of evidence in court. This kind of expert forensic video analysis evidence is frequently challenged by opposing attorneys. Through this evidence,…
Are you Qualified to be an Expert Witness? What is the Test?
In an earlier post entitled “Becoming Qualified as an Expert Witness for the First Time” I set out the four key requirements that must be met in order for expert…
Frame Rate: Understanding the Impact of Frame Rate on Video Interpretation
Surveillance video does not always have a frame rate that allows for continuous or near continuous recording of an event. Frame rates may be reduced to account for multiple camera…
Image Compression: Are Our Eyes Deceiving Us?
Digital compression of video images is a common occurrence. There are legitimate and laudatory reasons for such compression. Among those reasons are the fact that more data can be stored…
Editing of Images: When Do You Cross the Line?
Related to concerns with authentication, one of the most pervasive suspicions regarding digital image evidence is that the images have been surreptitiously edited in such a manner as to present…
Image Clarification: Not a Bar to Admissibility
One of the most commonly litigated issues regarding digital image evidence is the propriety of and limits to image clarification. Parties who tender clarified images argue that the clarified images…
Image Accuracy: Why the Correct Aspect Ratio Matters
Part of the process of authenticating a video image is to show that the image is an accurate depiction of what the camera recorded. One important technical issue bearing upon…
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