What is Photogrammetry? And What is a 3D CT?
Photogrammetry and a 3D CT are two different 3D scanning techniques. In photogrammetry, the 3D
scan is calculated from photos. The object is photographed from all sides, and software generates a
Inside the 3D CT Scanner (also known as 3D computed tomography), X-ray sectional images are
taken from all sides of the object, and the 3D scan is calculated from these images.
Fusion of Both Techniques
Both photogrammetry and 3D CT scanning have their advantages and disadvantages. With the fusion
of both techniques, we want to combine the strengths of both systems.
- The biggest advantage of photogrammetry is that it creates a colored 3D model
- The biggest advantage of 3D CT scanning is that it measures very accurately and that it also captures the interior of an object
By fusing of both techniques, we get a highly accurate colored 3D scan.
Research Project Cooperation
For this research project, we cooperated with the Institute of Technology Deggendorf and the
research institute Fraunhofer IIS. These institutes research the application possibilities of industrial
computed tomography. As a first feasibility study, we 3D scanned a shoe.
How Does the 3D Scan Work?
The shoe is placed on a turntable and photographed by three cameras. After a triple set of pictures
has been taken, the turntable rotates a few degrees further, and the cameras take another set of
pictures. The result is a set of 72 images from many different perspectives, from which a 3D model
can be calculated using photogrammetric software. For the next step, the 3D CT scanner is switched
on, and the shoe is x-rayed. Both 3D scanning techniques are performed one after the other and
without moving the shoe.
Merging Two 3D Scans
The recording process results in two 3D scans. One with color, created by photogrammetry and one
created using 3D computed tomography. Both data sets are merged. The color information of the
photogrammetric 3D scan is projected over the 3D CT scan. This fusion results in a highly accurate
3D scan with color.
Project Data for Download
We have prepared the unprocessed 3D CT scan, the photogrammetry photos and the finished 3D
scan for you to download.
- Adidas shoe raw high resolution 3D CT scan (OBJ)
- Photogrammetry picture set of Adidas Shoe (JPEG)
- Adidas shoe – Fusion of CT 3D Scan and Photogrammetry (OBJ + JPEG)
- Meshlab 3D viewer (also for color 3D models – free software)
The fusion of photogrammetry and 3D CT is ideal for creating highly accurate 3D scans of an object
with color. If we find a way to automate the recording process, as well as the data processing, this
3D scanning technique could be relevant for 3D product photography.
Do you need a 3D CT scan with color?
Holocreators offers professional 3D-scanning and reverse engineering services. We create 3D scans
with computed tomography (3D CT) and photogrammetry and thus can offer your highly accurate 3D
scans in color. We would love to help you with your project. Please call us at +49
40 481133 or send an email email@example.com