Forensic Digital Image Processing

Optimization of Impression Evidence

Brian Dalrymple, Jill Smith

• Publisher: CRC Press
• Year: 2018
• eBook ISBN: 9781351112215
• Topic: Technology & Engineering
• Subtopic: Forensic Science
• Index: Technology & Engineering

The digital revolution over the past several decades has advanced every facet of evidence detection, photography, optimization, and interpretation. Forensic scientists and practitioners have benefited tremendously from the move from film to digital. With proper procedures in place, digital images and casework capabilities have increased tremendously in both complexity and range due to a vast array of tools to enhance evidence and photography.

Forensic Digital Image Processing: Optimization of Impression Evidence provides the forensic investigator with the tools and understanding to extract, optimize, and interpret the maximum evidence possible from crime scenes to increase identifications. The book begins by examining the emergence of forensic digital image processing, and the gradual improvement and acceptance of the science over the past four decades. Coverage includes looking at the issues of image integrity and authentication including forensic image optimization and the manipulation of images. Chapters explore techniques exploiting color theory, modes, and channels to optimize signal-to-noise ratio in images.

One of the greatest assets of digital image technology is the ability to combine multiple images of the same subject to create a final, blended image: one that displays the desired evidence and is especially useful for fingerprint or footwear impression. Later chapters demonstrate image subtraction, focus stacking, and high dynamic range, utilizing images in optimum focus and with substrate interference diminished or removed entirely. The authors look at fast Fourier transform as an optimal tool for noise removal, addressing basic theory and diagnosis of the noise signatures. The book discusses the history of digital imaging techniques and their treatment within the court system.

Forensic Digital Image Processing: Optimization of Impression Evidence serves as an invaluable resource and tool for practicing professionals–as well as those new to the field—to look at best practices, the latest technology, and advances in utilizing the increasing array of tools of the trade.

Table of contents

• Cover
• Half Title
• Title Page
• Copyright Page
• Dedication Page
• Contents
• Foreword
• Acknowledgments
• Authors
• Introduction
• 1. History of Forensic Digital Enhancement
• 2. Establishing Integrity of Digital Images for Court
• 3. Color Modes and Channel Blending to Extract Detail
• 4. Multiple Image Techniques
• 5. Fast Fourier Transform: Background Pattern Removal
• 6. Contrast Adjustment Techniques
• 7. The Approach: Developing Enhancement Strategies for Images Intended for Analysis
• 8. Digital Imaging in the Courts
• Further Reading
• Index