This article is intended at introducing lawyers, accident Reconstructionist and those who work in the insurance industries to photogrammetry and how it can be used in field of forensics. Improved understanding of this unacquainted measurement tool can often bring significant particulars to light that can reinforce a case or totally converse the course of a trial in your favour. Photogrammetry is the science of taking geometric measurements from photographs. “Photogram” is a photograph and “metry” is the science of measuring. In the meantime a photograph takes images from the 3D world and projects it on a flat 2D image plane, we miss the depth information. On the other hand, photogrammetry can be seen as the procedure by which we do the contrary. By knowing some information about the camera that took the photographs and by having two or more photos of the same object from a dissimilar viewpoint, we can have some improvement in 3D information back. In some cases, it is likely to take measurements from a single photo as well, but there are some criteria that need to be met.
The philosophies of photogrammetry date back more than a few hundred years. Contemporary day photogrammetry is still an emerging science and the majority of people are ignorant of what photogrammetry is and what it can do for them. Accordingly, many are not taking benefit of capturing and preserving geometric data in their photos and others are simply not aware that they can extract 3D measurement data from their existing photos. There are different methods to a photogrammetry investigation based on the number and quality of photos. Each way has its compensations in correctness and straightforwardness as well as what can really be output for visual presentation. In a properly documented scene for which photogrammetry has been taken into account. All details can be recreated in 3D and the accuracy of measurements can be simply stated as being limited by the size of photos taken and by how well the objects appear in the photos. Majority of people are responsible for taking photos at accident or crime scenes don’t know, is that they could be capturing entire sets of 3D measurement data by simply adjusting their techniques to make their photos “photogrammetry friendly”.
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