Theoretical background, Operational Approaches and Best Practices
Images and videos, which have always had a huge impact upon the way people perceive the world and form their convictions, are pervasive in today’s reality more than ever. Even in the forensics scenario, evidences are more and more often composed by multimedia in general and visual data in particular. Since the new meaning of “original data” in this digital world requires new approaches to ensure the admissibility of these elements as evidence in a trial, starting from the first years of this century the need to prove the authenticity of a digital evidence became crucial. This work introduces the sub area of Digital Forensics, which has the aim to define and develop the procedures devoted to help operators in this challenging research area. After an introductory part, the topic of this paper was introduced, starting from the meaning of digital evidence, and following with the definition of Image / Video Forensics as a branch of the forensic sciences. Then some methods allowing the extraction of significant information from the images when it is not readily available are examined in detail. Finally, a list of free and non-free software devoted to face the daily challenges coming from processing images and videos for forensic purposes is provided. The work ends with a list of publications containing the Best Practices in the field.
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