Comments for Imaging Forensics

Comment on Open Letter to Advanced Imaging Magazine by Simon Lambert

Simon Lambert — Mon, 10 May 2010 15:11:21 +0000

Thanks for bringing this article to our attention, George. It’s vital that these people are put right.

Comment on Open Letter to Advanced Imaging Magazine by Larry Compton

Larry Compton — Sat, 08 May 2010 06:04:07 +0000

Very well said George. Thanks for taking the time to respond…and for sharing it with us.

Comment on Open Letter to Advanced Imaging Magazine by Grant Fredericks

Grant Fredericks — Thu, 06 May 2010 21:26:58 +0000

Nice letter George … please let us know if you get a response.

Comment on Reflecting back on 2009 by pnolte

pnolte — Wed, 10 Feb 2010 18:09:38 +0000

George One thing I spent time on last year was HDR and latent print imaging for AFIS searching. So far, I am getting great results in displaying faint ridges without clipping the darker ridges. It makes AFIS searching much easier. I can make some images available if you like. Pat

Comment on Using Photoshop and Bridge for On-Screen Comparisons by Erik Berg

Erik Berg — Fri, 29 Jan 2010 14:40:45 +0000

Very cool George. We’ll look at using this for doing facial examinations.

Erik

Comment on Synchronizing Video in Forensic Video Analysis by Erik Berg

Erik Berg — Fri, 29 Jan 2010 14:37:22 +0000

Steve,

To answer your question, the “standard” came from Steve Meager at the FBI via the NIST conference in 1999 I believe. The FBI and SWGFAST wanted 1200 ppi as a minimum. I pointed out that the resolution of several images in Hayden were only 289 ppi. The UK presented test results from 34 Latent Examiners that showed a resolution of 600 ppi actually produced one additional identification over the same set of images captured at 1200 ppi. NIST compromised by establishing a standard of 1000 ppi for the purpose of searching automated fingerprint systems. The UK established a standard of 600 ppi because they weren’t willing to pay for the additional storage and bandwidth 1000 ppi would require.

So, that’s where the 1000 ppi standard came from.

Erik

Comment on Reverse Projection Photogrammetry by Robert Wyman

Robert Wyman — Sat, 19 Dec 2009 22:50:34 +0000

George, I’m continuing to enjoy outstanding results with the iWitness photogrammetry program. I’m trying to employ it on every case, whether for actual documentation use or for my own continued training… and each case presents it’s own unique challenges!

I’m going to “sanitize” some of the names and locations, then put a gallery of scaled CAD diagram files on my website, with each diagram derived from photogrammetry-based documentation. Recent cases include a freeway crash site that could not be measured with traditional tools, a pedestrian fall site in which a sidewalk was found to have a subtle … but significant… change in grade, and a vehicular damage case in which the impact angle became a critical element.

I’m finding this “live” use of photogrammetry to be a unique tool in my crash-reconstruction arsenal.

Comment on Reverse Projection Photogrammetry by Nicholas Guanti

Nicholas Guanti — Tue, 15 Dec 2009 15:50:50 +0000

I have been fortunate to have exchanged dialogue with both Mr. Bruegge and Mr. Bruehs regarding several areas of expertise and can support the benefit of understanding reverse projection by way of their highly technical knowledgebase. Mr. Bruegge also offers a wealth of knowledge in other areas of forensic image examination and analysis.

Nicholas Guanti

Comment on An Introduction to the Blog by admin

admin — Tue, 10 Nov 2009 18:02:01 +0000

Yes, the OpenGL features in PS-CS4 are wonderful. The rotate tool is key for temporarily rotating your images during comparisons. The improvement in viewing images at odd magnifications is great. You need to be sure that you have a graphics card that supports these features, and the feature must be turned on in the Performance Preference. There’s more information on the Adobe website here: http://kb2.adobe.com/cps/404/kb404898.html

Comment on An Introduction to the Blog by Wayne

Wayne — Tue, 10 Nov 2009 17:45:09 +0000

Is anyone using the OpenGL feature (rotate hand tool)in PS-CS4 (for forensic work?) I get a wndow that says: “could not complete request-only works with OpenGL enabled windows.”