Tuesday, July 3, 2018

LEVA 2018 Conference - corrections

It's time to start planning for the next LEVA Conference. This time, the tour stops in San Antonio, TX.

The schedule's out and it looks like I'll be presenting on the morning of Wednesday, November 7, 2018. I'll be presenting my latest paper entitled Sample Size Calculation for Forensic Multimedia Analysis: the quantitative foundations of experimental science.

Abstract: The 2009 National Academy of Sciences report, Strengthening Forensic Science in the United States – A Path Forward, outlined specific structural deficits in the practice of forensic science in the US. A few years later, the Organization of Scientific Area Committees on Forensic Science (OSAC) was created within the US Department of Commerce (NIST) to address the issues raised and to publish standards in all of the recognized disciplines. Forensic Multimedia Analysis falls within the scope of the Digital / Multimedia Area Committee. In 2017, in an attempt to harmonize the various definitions of “forensic science,” the OSAC’s Task Group on Digital/Multimedia Science produced the following  consensus definition, “Forensic science is the systematic and coherent study of traces to address questions of authentication, identification, classification, reconstruction, and evaluation for a legal context.” In clarifying the definition, they noted, “[a] trace is any modification, subsequently observable, resulting from an event.” An impression left behind is certainly “a trace,” as is biological materials; but so is the recording of a person or a thing a trace of their presence at a scene.

In harmonizing practices across the comparative sciences, it has been recommended that all involved in the work have some familiarity with quantitative analysis and experimental science. This is evidenced in a recent Arizona Supreme Court case, Az. v Romero. In presenting this paper, “Sample Size Calculation for Forensic Multimedia Analysis: the quantitative foundations of experimental science,” I will introduce the science of quantitative analysis in general and sample size calculations in particular as they relate to three common examinations performed by forensic multimedia analysts. Attendees will learn the basics of experimental science and quantitative analysis as well as a detailed information on the calculation of the sample sizes necessary for many analytical experiments. The quantitative underpinnings of “blind” image authentication, forensic photographic comparison, and speed calculations from DME evidence will be presented and explored.

How many samples would you need for a 99% confidence in your conclusions that result from a “blind” image authentication exam? Hint: the answer isn’t 1 (the evidence image). Depending on the examination, and the evidence type, the number of samples varies. In this module, you will learn how to determine the appropriate number of samples for a particular exam as well as how to explain and defend your results.


My reason for this post? Why post the complete abstract here? It was edited in the Session Descriptions on the LEVA web site, removing some vital information and shifting the context a bit. Also, there were mis-statements made in my bio below the Session Description that incorrectly listed the duration of my employment at the LAPD as well as naming me the "founder" of the multimedia lab there. I'm posting the complete description as well as my professional biography to correct the record, in case a correction isn't made to the LEVA site.


Jim Hoerricks' Professional Biography:

Jim Hoerricks, PhD, is the Director of Customer Support and Training (North America) at Amped Software, Inc.

Previously, Jim was the Senior Forensic Multimedia Analyst for the Los Angeles Police Department. Jim co-founded the LAPD’s forensic multimedia laboratory in 2002 and helped set the standard for its handling of this unique type of evidence.

Jim is the author of the best-selling book, Forensic Photoshop, and a co-author of Best Practices for the Retrieval of Video Evidence from Digital CCTV Systems (DCCTV Guide). Jim also serves on the Organization of Scientific Area Committees for Forensic Science’s (OSAC) Video/Imaging Technology and Analysis (VITAL) subcommittee as the Video Task Group Chair.


Now, that's sorted. See you in November in San Antonio.

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