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…
Preparing for Trial: Meetings with Attorneys
Pre-trial meetings with the attorney who will be presenting the expert’s evidence in court are not a luxury. They are essential. Though it may be at times challenging to arrange,…
Expert Witnesses: The Need to Remain Current
Expert witnesses are professionally and ethically obligated to remain current in their field of expertise. Parties who retain experts and the courts that rely upon their testimony are entitled to…
What Should be in an Expert Report?
The culmination of an expert’s work is the expert report. The expert report represents the final written product of the expert and serves a number of important purposes. First, it…
Social Media Images: Authentication Challenges
The widespread use of handheld cameras and the penchant for posting video to social media have created significant evidentiary challenges from an authentication perspective. For example, cameras mounted on motorcycles…
Using Digital Signatures to Authenticate Video Images
Watermarks were discussed in an earlier post as a method of authenticating video images or showing that image alteration has occurred. Watermarks come with limitations. A more commonly used method…
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