http://kineticorp.com Forensic Engineering and Visualization Tue, 22 Aug 2017 15:41:01 +0000 en-US hourly 1 https://wordpress.org/?v=4.8.1 http://kineticorp.com/wp-content/uploads/2016/06/cropped-favicon-32x32.jpg http://kineticorp.com 32 32 KFSRT EP8 – Nathan Rose Discusses Video Analysis http://kineticorp.com/kfsrt-ep8-nathan-rose-discusses-video-analysis/ Tue, 22 Aug 2017 15:40:47 +0000 http://kineticorp.com/?p=6256 In a world of cell phones, google glasses, dash cams and traffic cams, we have access to detailed information. This information allows forensic engineers and attorneys to better understand their cases. Justin Holderness and Nathan Rose discuss video analysis and how it is now applied to accident cases.

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In a world of cell phones, google glasses, dash cams and traffic cams, we have access to detailed information. This information allows forensic engineers and attorneys to better understand their cases. Justin Holderness and Nathan Rose discuss video analysis and how it is now applied to accident cases.

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KFSRT EP7 – Toby Terpstra Discusses Lens Distortion http://kineticorp.com/kfsrt-ep7-toby-terpstra-discusses-lens-distortion/ Tue, 22 Aug 2017 15:39:46 +0000 http://kineticorp.com/?p=6254 In this week of Kineticorp’s Forensic Science Round Table, Justin Holderness sits down with Forensic Animation Toby Terpstra to discuss lens distortion; how it can effect the physics of a case and the research he has done regarding lens distortion. If you would like to learn more email Toby at… read more →

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In this week of Kineticorp’s Forensic Science Round Table, Justin Holderness sits down with Forensic Animation Toby Terpstra to discuss lens distortion; how it can effect the physics of a case and the research he has done regarding lens distortion. If you would like to learn more email Toby at [email protected]

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KFSRT EP6 – Nathan Roses Motorcycle Accident Reconstruction Book http://kineticorp.com/kfsrt-ep6-nathan-roses-motorcycle-accident-reconstruction-book/ Tue, 22 Aug 2017 15:38:28 +0000 http://kineticorp.com/?p=6252 Kineticorp’s Justin Holderness, and Nathan Rose discuss Nathan’s book on motorcycle accident reconstruction.

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Kineticorp’s Justin Holderness, and Nathan Rose discuss Nathan’s book on motorcycle accident reconstruction.

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Pixel Tracking Analysis http://kineticorp.com/pixel-tracking-analysis/ Wed, 09 Aug 2017 22:08:54 +0000 http://kineticorp.com/?p=6128 Video Transcription I wanted to try and find a quick, but accurate way of getting speeds of vehicles. Pixel tracking is a technique where you track a pattern of pixels across an image. So, the software allows you to find a window, which chooses your pattern. It could be something… read more →

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Video Transcription

I wanted to try and find a quick, but accurate way of getting speeds of vehicles.

Pixel tracking is a technique where you track a pattern of pixels across an image. So, the software allows you to find a window, which chooses your pattern. It could be something like a taillight, a logo, a license plate that the software can just lock onto. Once it gets that pattern it tries to find that same pattern in consequent frames and once it does it track that feature throughout that sequence. I can use this tracking software to just track headlights and license plates, or emblems on vehicles and since I already know the camera motion from having tracked it before I can use that information along with some information about the vehicle to determine location of that tracking point in 3D space over time, which would give me speed.

When you have the camera and you have the pixel tracking it gives you this vector that just keeps going out forever in space. You have to have some way of stopping it. So, I figure out where exactly it is. You know it’s along that line. but figuring out where it is on that line you need one other piece of information. So, the thing that I write about in this paper and the thing that I did in that particular example was look for the height off the ground. If the headlight is supposed to be two feet off the ground you find the point where it’s two feet off the ground, stop it, solve that point, and that’s where that point is in 3D space and time. Do that for multiple frames and you’ve got your speeds.

We actually had a train derailment we did in Montana. We wanted to recreate it, so William actually went out there and derailed a train just like how it happened in the accident. And basically, what we did was we set up two high speed cameras so I could triangulate points. So, we had those set up and I tracked points all about the train. I think it was, like 12 of them, in both cameras, using the same technique. And I got 3D points from for all of those and then using those 3D points I was able to see how they all moved together and solve for a single transform from it, which gave me position and rotation and from that I was able to recreate the exact motion of the train. You can see the actual footage and you can see the reconstructed footage that I did using that technique and they’re identical.

Mainly, the software we use for tracking is PF Track. That’s what’s used for tracking the video and the 2D tracking as well. I have also used After Effects for that. This particular software we also use does also have the ability to load the LiDAR data, and you can take your tracking points and assign it a point in that LiDAR data. You can tell it, “this point is actually this scan point.” And you can do it for multiple points.

There’s nothing in existence that actually takes that 2D data and transforms it into a 3D coordinate like we do here. That was all custom written stuff. So, that’s all scripts we’ve developed.

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Lens Distortion Correction http://kineticorp.com/lens-distortion-correction/ Mon, 31 Jul 2017 20:31:51 +0000 http://kineticorp.com/?p=6056 Read Kineticorp‘s SAE research papers about lens distortion: 2017-01-1422   2011-01-0286 Video Transcription (Toby Terpstra) Whenever we’re talking about photogrammetry, accuracy is always a consideration for us, regardless of the project. We want to know that the solutions—the photogrammetric solutions are accurate such that we can take measurements out of those… read more →

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Read Kineticorp‘s SAE research papers about lens distortion:

Video Transcription

(Toby Terpstra) Whenever we’re talking about photogrammetry, accuracy is always a consideration for us, regardless of the project. We want to know that the solutions—the photogrammetric solutions are accurate such that we can take measurements out of those solutions and know that those measurements are accurate. With lens distortion being present in a photograph, the camera matching photogrammetry or other kinds of photogrammetry can often be difficult or really impossible to get good solutions out of. So, it’s important to always remove those distortions whenever possible.

At Kineticorp, our first step is to look at the EXIF data on the photograph. Now, the EXIF data is the meta-data contained within the image file itself. So, within that image there’s header information or meta-data where you can see what camera was used, what the settings were within that camera, the field of view, that kind of thing.

(Sean Miller) Most of the lens distortion removal that we do is using software that already has the profiles for lens distortion that’s caused by the curvature of the lens. And there’s a big, long equation that you can calculate out the actual distortion and use that to remove it and there’s programs that can do that automatically.

(Toby Terpstra) If you’re stuck with an image that doesn’t have EXIF data, which happens to us all the time, we get images that are provided that have been saved out as a PDF, which strips out typically all of the EXIF data and then you don’t have the information about the camera. When you’re stuck with those kinds of images and you’re trying to perform photogrammetry on those, it can be really problematic if not possible.

We get photographs that we knew had lens distortion in them, visible lens distortion, but we had no EXIF data or no great methodology for being able to remove that distortion. So, out of the results of that frustration we began studying ways to remove that distortion without the EXIF data. The first one is what we refer to as the straight-line method, where we look at the photograph and determine, “are there any lines within this photograph that should be straight.” Edges of buildings, telephone poles, streetlights.

The second method is the point cloud method. We use a scanner–a 3D scanner like a FARO scanner or a Leica scanner, anything would work, to document the scene and really encompass it with a point cloud of data. That data is accurate, when thinking of a FARO scanner right now, plus-or-minus two millimeters. So, you have an accurate representation of that 3D environment that you can then take and compare specific points in the photograph to or against and know that, “look, here’s the true world measurements, here’s the measurements in the photograph, which is not accurate,” and then in comparing those you’re able to remove the distortion based on that. You should consider lens distortion. It’s not that it’s going to effect every camera match or every photogrammetry solution, but if you’re not considering it, you can potentially achieve that much error in your solutions or have that much error in your solutions and that can be problematic.

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KFSRT EP5 – Will Bortles Discusses EDR Research http://kineticorp.com/kfsrt-ep5-will-bortles-discusses-edr-research/ Thu, 27 Jul 2017 16:13:33 +0000 http://kineticorp.com/?p=6049 The information you can get from an event data recorder (EDR) has helped innovate vehicle safety technology but it is also very useful when it comes to reconstructing accidents.  In this episode of Kineticorp’s Forensic Science Round Table, Justin Holderness and Will Bortles discuss Will’s EDR research.

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The information you can get from an event data recorder (EDR) has helped innovate vehicle safety technology but it is also very useful when it comes to reconstructing accidents.  In this episode of Kineticorp’s Forensic Science Round Table, Justin Holderness and Will Bortles discuss Will’s EDR research.

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EDR Literature http://kineticorp.com/edr-literature/ Mon, 24 Jul 2017 21:28:54 +0000 http://kineticorp.com/?p=6027 Video Transcription Nathan Rose: You’ll often hear accident reconstructionists talking about EDRs and that just simply stands for “event data recorder.” As accident reconstructionists, we’re very interested in that data because we can use it in our reconstruction. So, it’s really a matter of the manufacturers giving reconstructionists, and others,… read more →

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Video Transcription

Nathan Rose: You’ll often hear accident reconstructionists talking about EDRs and that just simply stands for “event data recorder.” As accident reconstructionists, we’re very interested in that data because we can use it in our reconstruction. So, it’s really a matter of the manufacturers giving reconstructionists, and others, access to that data and different manufacturers did that at different times. We had a team at Kineticorp that looked at the accuracy of EDRs. This was a team that was led by Will Bortles. Wayne Biever assisted with this, Neal Carter assisted with this and Connor Smith assisted with this. And this team worked on pulling all this data together in a form that was usable for the community.

Will Bortles: So, as we were building this library of all these papers, we decided there’s no road map to any of this. The papers are kind of all over the place. There’s no way to really put your hands on a single road map to all this literature. So, since it didn’t exist we decided we were going to go ahead and do it ourselves.

Connor Smith: We have 187 papers that were out there. Papers, textbooks, legal stuff.

Will Bortles: If you want to look at just, of the 187 papers you’re looking for validation studies that involve Ford. If you want to go even further than that you do the Ford F-150 and there you go. You have a list of all the papers that you probably should have in your file if you’re looking at a Ford F-150. So, not only are these papers helpful for an accident reconstructionist that have articles about techniques for validation studies, but even in the legal community there’s some value here. It’s a road map to the literature and it’ll allow somebody in the legal community to find the appropriate admissibility papers.

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Highway Barrier Impact Analysis http://kineticorp.com/highway-barrier-impact-analysis/ Thu, 20 Jul 2017 20:51:45 +0000 http://kineticorp.com/?p=6013 Video Transcription Often times, we are asked to analyze how a vehicle interacted with a highway barrier. We can think of them in three general categories. One would be cable barrier. Another would be w-beam guardrail. And then, finally, concrete center median barrier or concrete barrier off the side of… read more →

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Video Transcription

Often times, we are asked to analyze how a vehicle interacted with a highway barrier. We can think of them in three general categories. One would be cable barrier. Another would be w-beam guardrail. And then, finally, concrete center median barrier or concrete barrier off the side of the road. And the difference between these types of barriers really comes down to how much they deform when a vehicle impacts them.

Barriers are there to protect people. The challenge is that there are a lot of competing issues that come into play. So, for example, we may want to prevent a vehicle from crossing over on the highway into oncoming traffic and we can successfully do that, let’s say, with a concrete center median barrier. The challenge is that the barrier is very rigid and so the rigidity of that barrier increases the injury potential for the occupants of the car that strikes that barrier.

In this type of crash there are five factors that we look at. One is the speed of the vehicle at the time it impacts the barrier. Another is the weight of the vehicle and the weight distribution of the vehicle. Another is the orientation and the travel direction of the vehicle at the time it strikes the barrier. And then, the front end geometry of the vehicle in relationship to the barrier system. And finally, we look at, in excruciating detail, the motion of the vehicle as it interacts with the barrier.

So, all these factors we’re talking about are important to understanding how the vehicle interacted with the barrier system and are important to uncovering the story that the physical evidence tells on any given case.

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KRSRT EP4 – Vehicle Technology and Accident Reconstruction http://kineticorp.com/krsrt-ep4-vehicle-technology-accident-reconstruction/ Thu, 20 Jul 2017 16:23:27 +0000 http://kineticorp.com/?p=6004 The growth of autonomous vehicles has created a number of questions for a number of industries.  Accident reconstruction is one industry that will absolutely be effected by vehicle technology.  Engineer and Auto Systems Specialist, Sean McDonough, discusses the future of Accident Reconstruction and Autonomous vehicles.

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The growth of autonomous vehicles has created a number of questions for a number of industries.  Accident reconstruction is one industry that will absolutely be effected by vehicle technology.  Engineer and Auto Systems Specialist, Sean McDonough, discusses the future of Accident Reconstruction and Autonomous vehicles.

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Photogrammetry Simplified http://kineticorp.com/photogrammetry-simplified/ Thu, 20 Jul 2017 16:07:09 +0000 http://kineticorp.com/?p=6002 Video Transcription Maximus, would you like to help me with an experiment? Um, yeah! Kineticorp uses a lot of interesting tools to do our analysis. One of the tools we use is called ‘photogrammetry.’ It’s not new technology. It’s actually old. It relies on the laws of perspective to analyze… read more →

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Video Transcription

Maximus, would you like to help me with an experiment? Um, yeah!

Kineticorp uses a lot of interesting tools to do our analysis. One of the tools we use is called ‘photogrammetry.’ It’s not new technology. It’s actually old. It relies on the laws of perspective to analyze photographs to determine things like distances and the shape and sizes of objects. Now, the process of photogrammetry, it’s relatively simple. You look at a photograph, as long as you have some context in that photograph you can determine the size and shape and location of other objects that are in there. So, I setup an experiment with my four-year-old son, his name is Maximus, because I figured it’s such an easy process that even a four-year-old can do it.

“Do you see this chair?” “Yeah…” “And do you see that box?” “Yeah.” “Can you go place the box and the chair as you see them in that photograph for me.” “Sure…this goes here. And this goes here!” “Are you sure?” “Yeah…that’s where they go.” “Thank you.”

Maximus was given a photograph to look at that has two objects in it, with a specific orientation, and he was to take those objects and place them in the room as he sees them in the photograph. And that’s what the video is of.

 

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