Otherwise known as ‘The Science of Single View Metrology’
The first common question asked to a forensic video analyst is, “Can you tell me what that license plate is?”. The second question is, “What is the height of that person?”.
It is then the forensic video analyst’s responsibility to analyze the video, assess its suitability to answer the question, process and prepare the images, and then finally use science to provide the answer, based on facts.
Taking a ‘workflow’ approach can often safeguard the user from missing vital information that may be relevant further along in the process.
There are a few different methods to attempt an answer to this height question, with different constraints, reliability, and drawbacks. In this post I will be taking an in-depth look at the technique built into Amped FIVE, using the filter Measure 3d.
What’s wrong with this video? Hint: look at the Inspector’s results for width / height.
Unfortunately, the answer in many people’s minds is …. nothing. I can’t begin to count the number of videos and images in BOLOs that attempt to depict a scene that looks quite like the one above. If you don’t know what you’re looking at, it’s hard to say what’s actually wrong with this video.
You may remember the announcement of our partnership with Griffeye, some months ago. This partnership is especially interesting since we both work on images and videos, but in a different, yet complementary way. Griffeye focuses on finding the needle in a haystack, while Amped focuses on sharpening the needle and verifying it is actually a needle and not a stick.
In the latest release of Griffeye Analyze, the Amped FIVE plugin has been added to the Analyze Forensic Market, but in the near future we plan to also add apps for Amped Authenticate and Amped DVRConv. In this post, we will show you how to start with the integration and how the two software work together.
First of all, we assume that you have installed Amped FIVE (build 9010 or later) and Griffeye Analyze (17.1.0 or later) on the same machine.
In order to enable the integration, you need to click on the button “Analyze Forensic Market”.
We’re back from the Axon Accelerate Conference. What an incredible experience to meet so many law enforcement professionals who are enthusiastic about going from Capture to the Courtroom with reliable tools based in science and fact, not tools repurposed from the art world.
I’d like to share today the answer to a question posed to us at the Conference. The question was, “how do you quickly get rid of that annoying orange color cast that you find in images / videos taken in underground locations or grow houses.”
The answer is the Temperature Tint filter (found in the Adjust filter group). But, before we look at the filter and how it works, let’s talk about about Colour Temperature.
The chart above is from my old book, Forensic Photoshop. It’s helpful to look at colour temperature from the standpoint of the Sun as it rises – the horizon going from warm to cool. Another way to look at colour temperature is with the chart below that places temperature (the Planckian locus in Kelvin) as it relates to the CIE XYZ Color Space.
During a recent workshop on image authentication, I ran a few practical sessions. One concentrated on the changes that online services and social media platforms make to the images that we upload. It turned out to be an interesting experiment that has had some structured research over the past few years.
These are excellent starting resources when developing any internal Standard Operating Procedure:
A Classification Engine for Image Ballistics of Social Data: https://arxiv.org/abs/1610.06347
A Forensic Analysis of Images on Online Social Networks: http://ieeexplore.ieee.org/abstract/document/6132891/
Why is this important?
If you’ve wondered at the filters in the Extract Filter group and asked yourself, what are these for, you’re not alone. Depending on your specific use case with Amped FIVE, there are likely a few filters for which you have no use in your current context. Others, you may use in a very specific way each time – but others may use them differently.
Thus it is that I encountered a request for a feature that’s been in Amped FIVE for quite some time. I’ve responded to the request with details on how to accomplish the task. Now, I’ll expand on the question and share a more detailed look at an often overlooked filter – Add Text. (click on the images to see the full-res versions)
The pace of change here at Amped Software is brisk. Each big update to our software brings new filters and updates based on user feedback and requests. Thus, it can be hard to keep track of what’s new and improved as time moves on.
In a recent conversation with a brand new customer, they noted that one of their pain points in using their old tools was changing frame rates. They’d get a request to slow things down and their tool would make the video look like a scene from a ghost movie. The results just didn’t look realistic – nor was the work handled in a scientific way.
I mentioned that Amped FIVE has the ability to change the frame rate of videos. It does so in an intelligent/scientific way. This functionality was added over two and a half years ago. Here’s the announcement from 2014.
There are a number of reasons why one would want to change the frame rate of a video, beyond the usual trial-prep functions of “slowing things down.” Most of the reasons center on the quality of the encoding and the file’s having correct frame rate information within the header.
What you don’t want to have happen is to add/subtract frames when you change the frame rate. With Presentation > Change Frame Rate, no frames are added or removed. The playback rate is changed. That’s all – but that’s huge. If you have a file with 1500 frames and the time/date stamp shows that from start to finish, 5 minutes elapse, then you need a playback rate that tracks with the number of frames/time. What you don’t want is added frames. Amped FIVE’s Change Frame Rate is the answer.
5 minutes = 300 seconds. 1500 frames/300 seconds = 5 frames per second. Just click on Presentation > Change Frame Rate and choose 5 (or choose the value based on your file’s properties). Your video is now set to play back at 5 frames per second. When you write out the video file, it will be written out to play at 5 frames per second.
Simple things should be easy, and fast. With Amped FIVE, they are.
If you’d like more information about our products or training options, contact us for more information.
Law enforcement officials have been sending out recordings of interviews to transcription services (or in-house transcribers) for decades. A complete and accurate text file of statements made in suspect / witness interviews has been a valuable aid to Detectives and Attorneys alike. Now that agencies have implemented new recording technologies (Body Worn Cameras, In-Car Video, & Interview Room recorders as examples), LEOs are looking to have the recordings made by these devices transcribed as well.
There are many services out there offering transcription for law enforcement. When choosing a service (when sending sensitive information outside of the LE agency), important considerations come into play. Not the least of these considerations are information security (CJIS) and standards compliance. There are plenty of services out there offering security and speed – both of which come at a cost. The most important consideration, however, is the format of the deliverable file. If the text is going to be used as subtitles for a video, it has to be formatted in a specific way. To be used as a subtitle file, It has to be formatted as a subtitle file. Not all transcription services offer this service. So it’s vitally important to choose a vendor that supports transcription that includes timing information and can produce a subtitle file. Without the timing information, synchronization of the text to the video becomes a manual (time consuming) process. With the timing information (see below), it’s fast and easy.
The good news is, we’ve got you covered. In fact, we’ve been supporting the insertion of subtitles for years. Let’s take a look at how this is done.
A crime has occurred. Your investigators comb the area looking for clues. Your media relations staff hit the airwaves asking for the public’s help. Your social media cyber team trolls the Internet for images taken about the time of the crime and in the general location.
An image shows up on social media that was taken a few minutes before the crime occurred, looking down the street at what is now your crime scene. But, what’s wrong with this picture?
Taken into the setting sun, the features of the scene are back-lit. Useful information is lost.
Or is it? Continue reading
In the recent Amped FIVE Update (Rev. 9010), there were some big additions to the advanced “File Info”.
The updated tool has already received high praise from regular users who can now do all their frame, stream, hex and format analysis from within the same application – Amped FIVE!
It’s time therefore to take a much closer look at this new and powerful functionality.