iWitness V3

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iWitness photogrammetry software systemiWitness is photogrammetry made simple; it produces 3D measurements and models from digital camera images and scanned analog photographs.

Virtually any camera can be used, with the ease of use and intuitive workflow of iWitness being unmatched by any other image-based measurement software in its price range. Moreover, the iWitness measurement process is fast, accurate and reliable.

Through interactive marking of features common within two or more overlapping photographs, iWitness builds a network of feature points and image locations using a process called relative orientation. Through operator-assisted and semi-automatic processing, 3D coordinates of points, lines and polylines can then be measured, and the resulting CAD-compatible model can be photo textured for realistic visualization.

For reviewing more iWitness Applications in the field, click here.

What our customers say:

"My department has used other photogrammetry programs for accident scene diagramming, and in my opinion, iWitness is clearly the best in terms of speed, robustness and ease of product use."

    Captain Bob Anderson
    Utah Highway Patrol

"With iWitness, I can measure a scene in 20 minutes.  I'm off the road, the other drivers are off the road, and together we're all off the road a lot quicker. "

    Sgt. Thomas Merkling
    Indiana State Police

iWitness - functionality that makes the photogrammetric difference

iWitness can accommodate any scale of measurement, from small forensic detail at a crime scene to objects and scenes recorded from low-level aerial photography. The iWitness system has a proven track record as the premier image-based mapping system for accident reconstruction, with other applications being in engineering measurement, modeling for animation, the movie industry, archeology and heritage recording.

- Automatic Camera Calibration: In order to obtain optimal measurement accuracy and reliability, cameras need to be photogrammetrically calibrated. With iWitness, calibration is a fully automatic process when AutoCal placards or the new B&W printed code nuggets are employed. The calibration can be carried out at any time in a matter of minutes. Alternatively, calibration can be achieved through the traditional operator-assisted process and it is also possible to self-calibrate the camera as an integral part of the 3D measurement process

- On-line Data Processing: Network relative orientation, subsequent spatial intersection for 3D point determination and coordinate transformation are three examples of the on-line data processing capabilities within iWitness. These and other mathematical operations are initiated automatically, as soon as the operator has made a sufficient number of image reference markings. The operator need never worry about pressing a Compute button. The on-line processing facilitates a very high level of quality assurance checking and it also provides a practical means for the operator to take instant corrective action in situations where operational blunders are inadvertently made.

- Easy to Learn: The workflow of iWitness is intuitive and streamlined, which means that the overall program operations are very easy to learn. In order to initiate the photogrammetric processing, images need simply be imported into the project. iWitness automatically recognizes the camera(s) used and there are no project set-up phases to labor through. To further assist in operator training, iWitness is supplied with a multimedia tutorial movie, a demonstration project (for initial practice) and a printed user manual.

- Camera Database: iWitness incorporates a read-only Global camera database that holds the basic camera geometry and resolution data for over 1000 digital cameras. When images for a new project are loaded into iWitness, the system accesses the appropriate camera in the Global database and loads the required information into a Local camera database where full calibration information is maintained. Cameras can also be assigned Unique IDs in circumstances where the same camera make and model might be employed, for example, with different lenses, and therefore different lens-specific calibration values.

- 3D Modeling Features: iWitness can measure attributed point, line, polyline and free-form curve information for CAD-compatible 3D model generation

- Visually Realistic Texturing Mapping: The photo-texturing of planar facets on a measured 3D model can be performed with iWitness to provide a visually realistic model of the object. This model can then be exported for viewing via VRML.

- 3D Graphics View: All 3D measurement data, from points to photo-textured surfaces can be displayed in a 3D graphics view, which supports interactive model manipulation and analysis functions.

- FOOM: The Focal length FrOm One IMage process involves marking points in a single image which correspond to object points in the photographed scene that have known 3D coordinates. By this method, the necessary camera focal length and lens distortion information for photogrammetric processing in iWitness can be obtained from a single image from an unknown camera. Click here to see an example of FOOM.

- No Restriction on Numbers of Cameras, Images or Measured Points: iWitness has no upper limit to the number of cameras, images and points forming a network, and measurements involving more than 100 images and 1000 points can be readily accommodated.

- Image manipulation: iWitness can import new images into a project at any time, and it has navigation features to allow the user to rapidly zoom & pan, rotate the image and adjust its brightness for better viewing. Fast, one-click semi-automatic target marking to better than 1/10th of a pixel accuracy is also available for high-contrast targets and there is a Guided Mode for ‘driving’ the user to predicted locations for rapid and more reliable marking within oriented images.

- Edit/Review Mode: Quality Control could not be easier than with iWitness’ Edit/Review mode. The operator simply selects the E toolbar icon and iWitness allows full interactive editing of each and every 3D measured point, as well as on-line spatial intersection to provide updated point accuracy estimates.

- Assignment of Scale and the XYZ Coordinate System: iWitness allows the interactive setting of scale via assignment of known object distances, and it also supports the well-known 3-2-1 procedure that allows the operator to interactively set the origin and orientation of the XYZ Cartesian coordinate system for the 3D data.

- Import Projects for Linking: Automated process for "linking" projects to one DXF file for immediate export to CAD.

- Coordinate Transformation to Control: This feature allows the user to transform multiple networks into a common XYZ coordinate system, especially for export to CAD. Such a ‘stitching’ of adjacent project measurements into a uniform XYZ reference system is very beneficial for the scene mapping of high-speed traffic accident events which can cover several hundred meters in length.

- Point Offsetting: Allows the user to establish a point of interest which is offset from a photogrammetrically measured 3D point in the direction of the user-specified Z-coordinate axis. This is very useful for effectively projecting targeted points (such as photogrammetric markers (RPMs)) standing above the ground to their corresponding planimetric position at the ground surface

- Exporting the 3D Model: Attributed 3D models from iWitness can be exported in the industry standard DXF format.

Additional Utility Programs included with iWitness

Zaraf: The photogrammetric interior orientation function necessary when measuring from scanned photographic prints or slides is performed by Zaraf. Unlike traditional approaches, Zaraf achieves the interior orientation by directly generating transformed, resampled digital images which simulate those recorded by a chosen camera. This greatly simplifies subsequent photogrammetric orientation in both iWitness and iWitnessPRO. See the Zaraf movie for an example of the process steps.

XYRectify: The function of XYRectify is to create rectified images of planar surfaces from oblique images. The rectified images can then be treated as scale-homogeneous 2D maps and they thus support the measurement of XY coordinates within the rectification plane. This allows, for example, accuracy measurements of positions on a roadway from oblique photographs, or measurements on a building façade from street level images.

An example project can be seen here, working in cooperation with the Atlanta Police Department. To see how XYRectify was used on a real-world crash imaged by police, review our XYRectify Tip Sheet.

iWitness Pricing:
- iWitness is available in the US for $1095.00 and shipping charges. Click here to order online.

- iWitness is available for International orders for $1095.00.Shipping charges will also apply to the total. Click here to order.


Shipments are typically made within 48 hours of receipt of the order.

Delivery Time:
is shipped 2-3 day delivery within the USA and generally within ten business days for international destinations. The customer is emailed with the tracking number for the shipment.