Which is better suited for my application, iWitness or iWitnessPRO?

With the release of iWitnessPRO, many ask which photogrammetry software system (iWitness, or iWitnessPRO) is better suited for their image-based measurement needs. We've put together the below chart to highlight the differences.

Comparison
 iWitness
 iWitnessPRO
Create 3D measurements from any consumer grade camera
Yes
Yes
Create accurate 3D models
Yes
Yes
One click target centroiding of synthetic targets
Yes
Yes
Perform the best photogrammetric camera orientation in the industry
Yes
Yes
Easy to use Graphical User Interface
Yes
Yes
Automatic network orientation with "one cursor click" using red-retro coded targets
NO
Yes
Automatic determination of "passive" red targets
NO
NYesO
Automatic determination of red-retro feature point targets
NO
Yes
Automatic determination of (signalized) Triplet targets NO
Yes
Automatic measurement of coded targets via construction points
NO
Yes
Automatic measurement of hundreds of images and thousands of 3D points
NO
Yes


The key difference between iWitness and iWitnessPRO is that iWitnessPRO employs red retroreflective coded targets to enable automatic network orientation, with subsequent automatic determination of the coordinates of any targeted feature point as well as offset points (construction points) via the codes 001 to 981.

iWitnessPRO provides all of the functionality of iWitness. iWitnessPRO is the only close-range photogrammetry software system available that permits automatic measurement of Passive Red or Red-Retro Reflective targets in color imagery. It retains the traditional operator-assisted natural feature marking of points, lines, polylines and photo texturing found in iWitness.

Consider the example of modeling a crushed vehicle (front/back, and both sides) with traditional operator-assisted network orientation (e.g., iWitness) which takes about 30 to 60 minutes to complete. Using iWitnessPRO, network orientation and automatic measurement is completed automatic in a matter of a few minutes, to an accuracy typically within a few tenths of a millemeter.

iWitnessPRO permits targeting of features with specialized (industry first) signalized targets that calculate a 3D object point to a target "tip".

Here's some thought that should help you in your decision with purchasing iWitness Vs iWitnesPRO.

1. If the bulk of your projects will not allow you to use iWitnessPRO coded targets, you're best served with using iWitness. You can always upgrade to iWitnessPRO in the future if you desire, so keep that in mind.

2. Is sub-millimeter accuracy required or desirable in your project?: Yes=iWitnessPRO, No=*iWitness.

3. Do you feel in some (or possibly many?) of your projects that you anticipate that fully automatic measurement is key to a compressed work flow and your time constraints? Yes=iWitnessPRO, No=iWitness.

4. Are the bulk of your projects outdoors, where measurements over tens of meters are required? Yes=iWitness, No=iWitnessPRO

5. Does the user action of "pushing one button" appeal to you, with the photogrammetric 3D model automatically created?: Yes=iWitnessPRO, No=iWitness.

6. Are you limited to using an "entry level" camera for the photogrammetry imaging?: Yes=iWitness, No iWitnessPRO. Note: for both iWitness and iWitnessPRO we recommend a moderately priced digital SLR camera, or at least a compact "bridge type" camera, with full manual control settings.

7. Do you plan on using one of these two systems for interior measurement and expect a high degree of measurement automation and accuracy (e.g., a homicide investigation, complete vehicle crush modeling, granite countertop reverse-engineering, custom wood fabrication, canvas boat cover fabrication, or complex surface modeling)?: Yes:=iWtnessPRO, No=iWitness.

If you own a digital SLR camera, and some of the questions above favor the "automatic measurement" then iWitnessPRO is your best solution.

*Both iWitness and iWitnessPRO are capable of producing sub-millimeter accuracy, while iWitnessPRO was specifically designed for high precision fully-automatic 3D measurememt.