Photogrammetry is the process of creating 3D models and measurements from 2D photographs.
How it works:
Image Capture: Multiple overlapping photographs of an object or scene are taken from different angles. The more photos and the better the overlap, the more accurate the final model will be.
Image Processing: Specialized software analyzes the photographs, identifying common points and features in the images.
3D Reconstruction: By analyzing the relative positions of these common points in the different images, the software calculates the 3D position of these points in space, effectively reconstructing the shape and dimensions of the object or scene.
Types of Photogrammetry:
Aerial Photogrammetry: Uses images taken from aircraft or drones to create maps, terrain models, and other geospatial data.
Close-Range Photogrammetry: Uses images taken from closer distances, often with handheld cameras, to create 3D models of smaller objects, buildings, or even archaeological artifacts.
Applications:
Archaeology: Documenting and preserving historical sites and artifacts.
Surveying and Mapping: Creating accurate maps and terrain models.
Construction and Engineering: Monitoring construction progress, inspecting structures, and creating as-built models.
Cultural Heritage: Creating virtual tours of museums and historical sites.
Gaming and Entertainment: Creating realistic 3D models for video games and movies.
Forensics: Documenting crime scenes and accident sites.
Advantages:
Relatively inexpensive: Compared to other 3D scanning methods, photogrammetry can be more affordable, especially for larger objects or areas.
Captures texture and color: Photogrammetry can capture detailed surface texture and color information, resulting in realistic models.
Non-contact method: It doesn’t require physical contact with the object, making it suitable for delicate or inaccessible objects.
Limitations:
Requires good lighting and image quality: Poor lighting or blurry images can affect the accuracy of the results.
Can be computationally intensive: Processing large numbers of images can require significant computing power.
Challenging for objects with reflective or transparent surfaces: These surfaces can cause issues with feature detection.
EXAMPLES
https://www.factum-arte.com/pag/1345/PHOTOGRAMMETRY
‘Point cloud’ of the Three Graces by Antonio Canova © Factum Foundation
https://www.pix-pro.com/blog/human-photogrammetry
TOOLS
Kiri Engine App:
https://www.kiriengine.app/
Mac / iOS: https://www.photocatch.app/
Android:
https://peterfalkingham.com/2023/11/24/realityscan-photogrammetry-on-android/
EPIC GAMES iOS/Android FREE • Reality Scan: https://www.unrealengine.com/en-US/realityscan
ASSIGNMENT
11 • Human Photogrammetry
Using a mobile equipment and the app of your choice, you will create 5 distinct 3D models of a human being (it can be your roommate, a family member, and actor, a friend, etc.) Additional details to be given during the in-class demos.