iWitness Photogrammetry Software

iWitness is the most robust and user-friendly close-range photogrammetry software available for creating three-dimensional measurements from photographic images. A complete measurement system for 3D scene reconstruction now needs only a consumer-grade digital camera, a PC and the powerful, inexpensive iWitness software.
iWitness applies advanced photogrammetric technology through an easy-to-use system focussed specifically upon the 3D measurement needs of accident reconstruction and forensic analysis, and it can also be used equally well for a much broader range of measurement tasks.

Main features:
– Affordability, at under $US1000 per license
– Very simple operation supported by automatic processes
– Highly rigorous and robust photogrammetric orientation
– Efficient and fast ‘stitching’ of photogrammetric project networks
– Quality indicators at all stages of the measurement process along with
output of accuracy obtained
– A fully automated process for camera calibration
– Graphics capability for network analysis
– Export of 3D measurement results in DXF format for CADD analysis
– Photo-realistic texturing of 3D models
– Generation of 3D curves and edges from 2D curve/line markings in
images
– The handling of complex measurement tasks, with there being no
restrictions on the number of images employed or the number of
measurement points

Features

Exceptionally intuitive and easy to use, with a minimum of toolbar buttons and pull-down menus and a maximum of rigorous background computational support: a full multi-image 3D measurement may involve no more than left-mouse clicks and five toolbar buttons.

Automatic recognition of the digital camera or cameras being employed, either consumer grade or professional; iWitness maintains a comprehensive database of cameras and calibration information.

Photogrammetric orientation processes occur automatically: 3D object point coordinates are updated with every new image point referencing, providing instant measurement results and very robust quality control.

Accomodation of very complex image configurations:
iWitness readily handles the orientation of very difficult
network geometries.

Fully automatic camera calibration, supported either as a stand-alone operation or as an integral component of the object measurement process (self-calibration).

Auto-assisted image marking and referencing; single-key
centroiding leads to both high-accuracy image marking
(to 1/30th pixel) and optimal XYZ coordinate accuracy.

Guided Referencing Mode: In the referencing of the third and subsequent images, image point locations are predicted, allowing fast, single-image referencing of feature points.

A Review Mode: This allows the accuracy of all image marking and referencing to be assessed, point-by-point, with interactive refinement of referencing, and instantaneous updating of network orientation and 3D point measurements.

Texturing of 3D models: Through image rectification to planar facets, full photo-realistic texturing of the 3D object model is available.

Generation of 3D curves and edges: 3D Curves and edges can be generated from 2D curve and edge segments marked in the images.

Flexibility to interactively set and change the XYZ object coordinate system, assign scale and tie-in to any chosen existing reference frame via control points.

Accident Reconstruction & Forensic Measurement

 iWitnessPRO is extensively used for traffic accident reconstruction and forensic measurement, with photogrammetric technology being equally applicable outdoors or indoors, with photography from the ground or from UAVs (drones). Notable advantages of the iWitnessPRO approach include:

• Fast scene recording leading to minimal road closures & less traffic disruption
• Photography offers a permanent record; feature measurement at any time
• Technology is very low-cost; can use any camera
• iWitnessPRO is very easy to use & provides fast & accurate 3D measurements
• Operational scenarios: manual through semi- to fully automatic
• Data redundancy affords robust and reliable quality measures

iWitnessPRO has been adopted as standard approach for accident reconstruction across multiple states and 100s of police departments in North America and internationally.

Architecture, Archaeology & Heritage Documentation

iWitnessPRO is an ideal 3D measurement tools for a wide range of 3D measurement and modelling tasks in architecture, archaeology & heritage recording in general. The recognised attributes of photogrammetry for these applications centre upon the rapid, non-contact nature of the photography; the fact that scenes can be comprehensively recorded with image measurements being possible at any time; and the ease of use of iWitnessPRO-based measurement, which need not require more than a consumer-grade camera to support operational scenarios ranging from manual feature measurement to fully automatic 3D object reconstruction. These attributes are exemplified by the modelling of the Holsten Tor in Luebeck,

Engineering Measurement

Australis and iWitnessPRO are applied in engineering for purposes ranging from design and as-built surveys through to deformation measurement where the automatic measurement functions of iWitnessPRO are especially beneficial. Accuracies to around 1:50,000 are attainable via Australis’ automatic 3D measurement process when targets and a good quality DSLR camera are utilised.

Surveying & Mapping

iWitnessPRO is used by surveyors primarily for feature surveys, and often to generate 3D coordinate data to support building and planning approval processes. Measurement of 3D feature points by iWitnessPRO in local surveys requiring modest accuracy is often faster than via a total station, especially when point numbers run into the hundreds. It is also suited to the automated generation of 3D surface models and associated rectified and orthorectified imagery, and it is an ideal tool for localised mapping from photography gathered by a UAV (drone), where digital surface models (DSMs) and orthoimagery are generally sought.

General 3D Measurement & Modelling

For objects large and small, far and near, recorded with sequences of frame images or video, iWitnessPRO-V4 and Australis offer the full range of easy-to-use image-based 3D measurement functions for  a wide range of further applications in areas such as mining, construction, medicine, ecology and the film industry. Prospective users can contact Photometrix should they have questions about the suitability of iWitnessPRO and our range of products for a prospective 3D coordinate measurement, modelling or mapping task.

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