SceneVision-3D Reconstruction of a (staged) Murder
These images of a staged murder scene illustrate many of the capabilities of a 3D Laser Scanner and SceneVision-3D software for crime scene measurement, photography, diagramming, investigation, and presentation. The data was captured with the DeltaSphere-3000IR Laser Scanner with the color option (a Fujifilm professional digital SLR and Nikon lens). All images and models were processed with SceneVision-3D software - and these images were produced with SceneVision-3D.
3D Laser Data
The 3D laser scanners automatically rotate a full 360°, but lasers cannot see through objects. To capture all the different surfaces in this scene, the tripod was placed in 6 different locations. The images below show the unprocessed, 3D data produced by 2 of these scans - taken from opposite sides of the bodies. Each scan measured over 9 million individual points and took about 12 minutes (the Focus3D takes about 4 1/2 minutes including color). Each pixel below represents one of those 3D points.
You may have noticed that some of the horizontal lines that should be straight appear curved. This is a result of projecting the 3D data into a 2D image. When we look at this data in 3D, those lines will be straight. The data is immediately available for viewing and measuring, but it's often more convenient to work with the data in 3D.
3D Model Data
SceneVision-3D provides tools to quickly produce 3D computer graphics models from 3D laser data. To combine these scans into a single model, SceneVision includes a tool for aligning the scans. Aligning 6 scans like these takes only a few minutes. Unlike using a total station, it is not necessary to measure where you place the tripod while at the scene. SceneVision uses information in the data to align the scans. The model below, seen from several viewpoints, is a combination of all 6 scans.
SceneVision's Wall Wizard enables simply double-clicking on walls, the ceiling and the floor to automatically produce the edges of a room with measurements. These edges can be shown as part of the model - or alone without the original data as a diagram of the scene. Adding measurements for doorways, windows, furniture, or other objects is easy using SceneVision's tools for measurements between points or perpendicular measurements to any flat surface.
Much can be accomplished using the laser data alone - as shown in the images above. But color, especially high-quality color, transforms the data into a photorealistic model of the actual crime scene. Below you see the same two scans after the color has been added.
Once you have these color files, SceneVision automatically can produce a color model identical to the grayscale model above - with no additional work - as shown in the first image at the top of this page and the two images below. In addition, any measurements or other annotations made on the grayscale model or laser data will automatically appear in the new color model. (Note: The 3D model can be viewed from any location and any angle - here we've just selected one interesting viewpoint.)
Panoramic Image Data
Once the laser data and color images have been combined as shown, SceneVision provides a tool for automatic generation of high-resolution, color panoramic images. These provide 360° views from a single scan location. In addition, because these images are all aligned with the laser data, measurements can be made on the panoramas just as on the 3D models.
The digital camera on the DeltaSphere can be removed and used independently to take high-resolution, close-up photos anywhere in the scene. Because this camera has been calibrated for the system, using SceneVision's tools, these photos can be embedded in the 3D model. For example, a close-up picture of blood spatter has been placed on the kitchen wall - aligned precisely with the 3D model.
Blood Stain Pattern Analysis Tool
SceneVision-3D's blood stain pattern analysis tool will make measurements on high-resolution blood spatter photo, calculate the trajectories, and produce 3D lines in the model - as shown in the image below. SceneVision can also use measurements made elsewhere by the user to calculate and draw the trajectory lines.