Rollei Metric method

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The Rollei Metric method is a measurement and display method for criminal investigation crime scenes . It is a photogrammetric measuring process , that is, recordings are made with a measuring camera from which the distances are calculated. The procedure is used by the North Rhine-Westphalia police. It has also been used by the State Criminal Police Office since 1992. The technology is mainly used for capital crimes.

For this purpose, recording teams were formed in the forensic area of ​​the country's six crime headquarters and equipped with measuring cameras. At the same time, a central crime scene survey service was set up at the State Criminal Police Office in North Rhine-Westphalia , which can also be used to record the crime scene and which also evaluates all Rollei Metric survey projects nationwide.

application areas

The Rollei-Metric method is mainly used to measure large accident sites. These include, for example, motorways , plane crashes, rail accidents and explosion accidents. It is precisely in these cases that the process shows its strengths. Further areas of application are the determination of the size of the perpetrators using surveillance photos, the reconstruction of projectiles and shooter locations and the determination of the volume of spoil heaps , as required in environmental criminal law.

description

Rollei-Metric is a photogrammetric measuring system. It consists of two different programs or application areas. In the CDW (Close Range Digital Workstation) program, so-called multi - image measurement is used. In contrast to Monobild NRW , several photos of an object or piece of terrain are used to measure it. Similar to the way humans take two separate images with their two eyes and process them into spatial information in the brain , photos are produced from as different angles as possible and linked by software in the computer to form spatial information. In this way, every point can be measured precisely in free space.

However, if there are a large number of traces at the scene of the accident, this is quite labor-intensive for the evaluator. For this reason, CDW usually only regenerates the shape or surface of an object, such as the roadway and adjacent terrain in the event of an accident or the building structure of an internal crime scene.

Then the Rollei Metric MSR (Metric Single Image Rectification) program is used, a compatible mono image rectification. Here, the grid model previously generated in CDW is underlaid as a three-dimensional control point figure and various, specially manufactured trace photos are now applied to the road surface , walls or floors as dimensionally corrected photo textures.

The result is a three-dimensional virtual scene of a crime or accident, which enables the creation of a true-to-size photographic top view (orthophoto) or a line drawing, but can also be the basis for realistic three-dimensional video animations.

advantages

The process records all accident lanes three-dimensionally, including those that are outside the lane. It thus covers all situations in which Monobild NRW cannot be used.

Rollei-Metric is extremely precise. In NRW, only metric measuring cameras from Rollei are used. A deviation of a maximum of three cm over a track length of 100 m is maintained.

With Rollei-Metric, even large traces can be processed very quickly. Basically, only three reference routes have to be measured and some additional markings have to be made on the roadway. Of course, the fact that the LKA team is usually deployed in a helicopter and can therefore have an ideal camera height of 30 to 60 m also makes a decisive contribution to this.

disadvantage

The use of the crime scene survey service is associated with a certain time delay, which ideally can be around 60 minutes during office hours.

Sometimes a helicopter is not available due to the operational situation. It is not possible to use helicopters in the dark and in particularly bad weather conditions. Outside of office hours, the crime scene survey service can be requested in exceptional cases, but the time delay is greater.

literature

The medium format and large format cameras from Rollei in cooperation with Prof. Dr.-Ing. Wester-Ebbinghaus are included in the following book:

  • Claus Prochnow: Rollei Report 5 . Lindemanns Verlag, ISBN 3-89506-183-2 .
  • Udo Afalter: Rolleiflex, Rolleicord . Afalter, Gifhorn 1991, ISBN 3-920890-09-4 .
  • Udo Afalter: The Rollei Chronicle. Vol. 1-3. Afalter, Gifhorn 1990, ISBN 3-920890-02-7 .
  • Udo Afalter: From Heidoscope to Rolleiflex 6008 . Lindemanns, Stuttgart 1992, ISBN 3-928126-51-2 (comprehensive work with chronicle about Rollei products, e.g. Heidoscop, Rolleiflex SL 66, Rolleiflex 6008, Rolleiflex SL 35, Rolleiflex SL 26, Rolleiflex 2000 F / 3003, Rollei A110, viewfinder cameras, super 8 cameras, projectors, flash units, studio flash systems, films, slide frames, enlargers, special constructions, metrics, binoculars, tripods, lenses, accessories and Voigtländer products from 1972 to 1982).

swell

  1. Information material from the various institutions
  2. Acquisition from advanced training seminars

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