This blog is no longer active and is maintained for archival purposes. It served as a resource and platform for sharing insights into forensic multimedia and digital forensics. Whilst the content remains accessible for historical reference, please note that methods, tools, and perspectives may have evolved since publication. For my current thoughts, writings, and projects, visit AutSide.Substack.com. Thank you for visiting and exploring this archive.
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Welcome to the Forensic Multimedia Analysis blog (formerly the Forensic Photoshop blog). With the latest developments in the analysis of m...
Thursday, May 30, 2013
Analysis or demonstratives?
Photoshop's analysis tools are very limited, so I was thrilled to find FIVE on the market. FIVE isn't a tool for creating demonstratives, so I'm a happy Creative Cloud subscriber. I may be asked to repeat another expert's work, so I try to have all the latest tools out there (I know, I'm a bit spoiled). For images: Photoshop, FIVE, ImageJ, MATLAB, Gimp, and etc. For video: Photoshop, FIVE, Premiere Pro, Avid MC, Vegas, iMovie, Final Cut, and etc. For audio: Audition, DC Live, Audacity, Sound Forge, and etc. For mobile devices, FINALMobile, Cellebrite, XRY, and so on.
What I've found is that results often vary by the tool. Can I reproduce the results of an Avid MC project in Sony's Vegas? Can I follow a Photoshop project's notes exactly in FIVE? Sort of. But, will sort of work for your case and your court? Maybe.
These are some of the issues that I'll bring up when I present Forensic Image & Video Analysis at this year's LEVA Conference in September.
Our juries are becoming more sophisticated. They’re demanding deeper responses and better explanations to questions about your clarification / enhancement / analysis techniques. What did your program do? What’s the scientific basis for your work? Can you cite published references for the tools that you employ in your workflow? Remember, part of your testimony (telling your story) now involves framing the science of your analysis in a way that your jury can understand.
In this session, we'll move beyond workflows and checklists and enlist the help of some of the legends of mathematics to focus on the science that lies beneath the surface of the filters that we use every day. Unlike your use of other tools (which are largely used for creating demonstrative exhibits), in this 16-hour class, we’ll approach forensic image & video analysis from a scientific perspective, relying on the scientific method to guide our path to discovery. Along the way, will discover whom Joseph Fourier and Carl Friedrich Gauss were and what do they have to do with our work as analysts.
Wednesday, May 29, 2013
Playing well with others
One of the leading manufacturers of body worn audio/video recorders for law enforcement outputs AVI files from it's software using an MJPEG codec. Their proprietary video's frame rate varies - so the frame rate in the resulting file tends to vary too.
In general, our edit bay technology was designed for the broadcast industry (Avid, Adobe, Sony, etc). They don't like variable frame rate media. Thus, dropping these videos on a timeline, making corrections and other edits, then outputting to some MPEG file for inclusion in a detective's PowerPoint becomes problematic. Frame counts don't match. Frames get dropped/added according to the output codec. Ghosting can happen.
A discussion ensued. Edits were being done to the AVI transcoded copy that was being used for demonstrative purposes. The original files were unchanged and remain in their proprietary format - available for the court if necessary. So ... the question - does it make a difference if the frame counts don't quite match (demonstratives vs. originals) as long as the essential details of the case are preserved?
Tuesday, May 28, 2013
Creative Cloud: an Update
Thursday, May 23, 2013
Pantone celebrates it's 50th anniversary
Wednesday, May 22, 2013
Spirit of Blue helps Revere PD
The Spirit of Blue Foundation helps LE agencies through grants of product. Check out their site to see if there's a grant that will help your agency.
Monday, May 20, 2013
Timestamps in FIVE
A few weeks ago, Amped released a new update for FIVE that includes a 64 bit version of their software. A week later, they released another update with some other improvements and a few new tools. One of the features that they updated is the Write Timestamp filter. As they note in their blog post, "Sometimes when you export a video that comes from a proprietary DVR format from CCTV you may lose the date and time information that was impressed on the native format when playing it. With the Write Timestamp filter you can manually add back the date and time information so you can quickly locate events of interest at known times."
All of this presupposes that you know what the correct time should be.
First published in 1988, ISO 8601 is the international standard for the worldwide exchange and communication of date- and time-related data. Thus, the ISO 8601 standard date format is commonly used in metadata. Complicating matters a bit are those standards bodies that cover the metadata space. The Dublin Core™ Metadata Initiative, or "DCMI" for example, is an organization supporting innovation in metadata design and best practices across the metadata ecology. The DCMI listing for date defines the property as "A point or period of time associated with an event in the lifecycle of the resource." By this definition, the property includes time information, not only date. More importantly, the DCMI recommends that date information be stored according to the W3CDTF profile of ISO 8601. This format normally lists time zone and precision. This data is often believed to be missing by those who lack the ability to peek into stored binary formats. But, if you have the data and the means to decode it, then you have what you need to rebuild these timestamps in FIVE.
One confusing element to many has to do with Coordinated Universal Time (UTC) or Zulu time (Zulu time is the term for UTC used by western military agencies). When the time is deliberately expressed in UTC, as is often the case with DVRs produced in Asia and sold to the west, then W3CDTF/ISO 8601 indicates that you use "Z" for the timezone designator, e.g., 2012-03-15T12:12:04Z. Many CCTV systems standardize on always using UTC because its consistent worldwide. That practice is helpful when carving data from storage devices as it makes sorting and searching more convenient.
Thus, if you are able to carve out and parse this information, then getting this information back into your video is where the Write Timestamp filter comes in. It's as simple as data entry, as they explain in their blog post.
If you would like to learn how to carve this type of information from CCTV storage drives, I'm hoping to do a workshop on this topic at next summer's NATIA conference in San Diego.
Enjoy.
Thursday, May 16, 2013
Creative Cloud for Government
With that in mind, here's the response that I received:
- We will be updating our Government Price List in July and you will be able to purchase through authorized resellers, at that time. If [your agency] chooses to enter into an ETLA (Enterprise Term License Agreement), then yes, one, annual payment would be allowed, along with annual “true ups”.
- Log in’s and further details, specific to Government End Users will be addressed at 2 separate webinars.
Wednesday, May 15, 2013
Moving files backwards from Photoshop CC
So, if you decide to go down the subscription path, but later can't afford the payments, you can still work with the old versions of Photoshop that you "own."
Enjoy.
Tuesday, May 14, 2013
Reaction to CC is mixed
Monday, May 13, 2013
Say goodbye to Photoshop Extended
Friday, May 10, 2013
Camera Raw 8 as a filter?!
Thursday, May 9, 2013
What are Adobe's customers saying about the CC announcement
In all, you can sense that Adobe's messaging caused more confusion than cheers. The biggest confusion, the subscription prices announced at MAX 2013 are for the first year only. What will be the price going forward? Will government purchasers be able to lock in prices for 3-5 years? Who knows. More news to follow.
Wednesday, May 8, 2013
Creative Cloud for Government?
1) Major Updates to the Creative Cloud: Adobe announced a significant update to Adobe Creative Cloud, its flagship offering for creatives. Available in June and packed with new features, Creative Cloud reimagines the creative process through a set of “CC” desktop applications and cross-device collaboration and publishing capabilities. See the full press release here.
2) Accelerating their Shift to the Cloud: Adobe has seen the adoption of its Creative Cloud solution, and they have decided to focus their creative software development efforts on that platform moving forward. While Adobe Creative Suite® 6 products will continue to be supported and available for purchase, the company has no plans for future releases of Creative Suite or other CS products. See the full press release here.
Also released was a comprehensive description of Adobe’s Creative Cloud for Enterprise offering, as well as an Enterprise FAQ and a short, succinct Government FAQ section.
"Available in July, government customers will be able to purchase the Creative Cloud Desktop Applications subscription via Adobe’s CLP-G licensing program. The Creative Cloud Desktop Applications subscription includes all of the available CC apps, plus Acrobat and Photoshop Lightroom. These applications can be deployed locally and do not require server-based license validation during the term.
What is the CLP-G program?
CLP-G is a contractual procurement program specifically setup to transact business with government agencies."
It remains to be seen if government purchasing agents will go for a subscription based software purchase - and one that expires at the end of the term.
Tuesday, May 7, 2013
Multiple GPUs supported in Premiere Pro CC, sort of
For the current list of officially certified GPUs for Premiere Pro CC, click here.
Monday, May 6, 2013
Photoshop CC for Creative Cloud Members Coming Soon!
As a Creative Cloud customer, I'm looking forward to seeing the new version. That I'll get to see it sooner than folks who bought the boxed version makes me feel a little special.
John Nack weighs in on the pricing scheme: "Shouldn’t loyal Adobe customers get a discount moving to Creative Cloud? Short answer: Absolutely.
Longtime Adobe customers have been very clear in their comments here throughout the last year: they’ve invested serious money with the company over the years, and they want that to be honored as we move forward.
Adobe agrees, so check this out. If you own CS3 or later:
- You can get Creative Cloud Complete (the whole $2,600 Master Collection & more) for $29.99/month.
- Even better, if you own CS6, you can get Complete for $19.99/month (60% off the new-user price of $49.99).
- If you don’t need or want everything in Complete, you can get Photoshop CC and other new CC apps for $9.99/month. That’s about 35 cents per day."
Sunday, May 5, 2013
Are tool mark analysis and firearms exams part of gun buy back programs
The short answer is, I don't know. The long answer is that some do and some don't. Many agencies have the capabilities - but choose not to for public relations purposes. Others simply don't have the staff, or enough staff to handle the work of processing the hundreds of weapons turned in during these programs - in addition to those recovered during regular investigations.
I've often wondered how long it will be until a retired analyst, or other such expert, hangs a shingle and contracts with their local agency to perform the service - or takes on regional business. Something to think about given the amount of unsolved firearms related crimes on the books nationwide.
Saturday, May 4, 2013
GoldWave turns 20
Enjoy a 4 month free trial! User ID: NFEMBJP8C, License: PH6N2AL5E, Expires: 2013/08/28.
Pass it on!
Friday, May 3, 2013
Adobe's SpeedGrade CS6 for LE Production work
If you're in the production business, you need to look closely at SpeedGrade. I think that this will do for video folks what Match Color did for us Photoshop folks years ago.
Thursday, May 2, 2013
The call for more CCTV in the US
Now, folks are remarking at the private video footage that aided in the identification of the Boston bombing suspect in their call for more cooperation between private CCTV system owners and law enforcement.
When government does anything, it tends to be very expensive and more for political optics than for actual problem solving. Most of the private systems bought from big-box stores at around $600 (for 8 cameras and a DVR) can be put on the owner's DSL line and accessed by law enforcement when necessary. This seems the more intelligent option, if the owners choose to participate.
But again, whilst properly configured CCTV systems help in the investigation of crimes, as the UK has shown, they tend to have little preventative effect.