Forensic Uses of Digital Imaging

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Forensic investigations and trials are using digital imaging to an eve r-increasing extent. The resulting images are transmitted across the i nternet and in the process are often compressed with loss of informati on. Many users of these tools are not experienced or skilled in the be st practices and in many cases errors of commission or omission taint the results. This book shows step-by-step how to use digital imaging t o its best advantage. It provides expert witnesses and attorneys with a realistic assessment of what these photographs can and cannot provid e as evidence.

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Editorial Reviews

Police and trial lawyers are increasingly relying on imaging professionals such as the author (shown in an unprocessed digital mug-shot). He makes a case for forensic uses of digital imaging; explains processing and identification techniques; and discusses working with the legal system. Thirty color plates include such intriguing examples of the possibilities offered by digital technologies as comparing attempts to disguise a human face, altering color images (one application: comparing images of a check), and superimposing a boot sole photo onto a footprint image. Russ, who developed software to implement the algorithms presented here, formerly taught at North Carolina State U. Annotation c. Book News, Inc., Portland, OR (
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Product Details

  • ISBN-13: 9780849309038
  • Publisher: Taylor & Francis
  • Publication date: 5/25/2001
  • Edition description: New Edition
  • Pages: 200
  • Product dimensions: 6.00 (w) x 9.00 (h) x 0.70 (d)

Table of Contents

Digital Cameras and Forensic Imaging
Why go digital?
Uses of digital imagery
Film as a light sensor
Tonal and spatial resolution, and their consequences
Color response
Digital photography
Maintaining chain-of-control with digital images
Digital video
Taking good pictures
Presenting pictures in the courtroom
Processing Digital Images
Noise in digital images
Noise reduction methods
Median filtering
Processing color images
Nonrandom noise
Adjusting contrast, brightness and gamma
Adjusting color balance
Adjusting size (magnification)
Spatial distortions
Other applications
Enhancement of detail
Sharpening color images
Other enhancement techniques
Less common processing methods
Color separation and filtering
Frequency space (Fourier processing)
High and low pass filtering, band-pass filtering, and periodic noise
Deconvolution, or removal of system defects
Measuring image resolution
Resolution from the Fourier transform
Tonal (gray scale) resolution
Detecting compression
Detecting forgeries
Maintaining records
The imaging chain
Surveillance video cameras
Recording and playback problems
Pixels and resolution elements
Noise and tonal resolution
Other shortcomings
Image restoration
Recognition and identification
Identification of faces
Identification by DNA
Misdirection and mistakes
The expert witnesses
Working with counsel, judges and juries

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