How can you capture high-resolution 3D models with structured light scanning?

1 How does it work?

Structured light scanning works by projecting a series of patterns, such as stripes, grids, or dots, onto the surface of an object. The camera captures how the patterns are distorted by the object's shape and texture. By analyzing the differences between the projected and captured patterns, the software can reconstruct the 3D geometry and color of the object. The process can be repeated from different angles to capture the whole object.

2 What do you need?

To perform structured light scanning, you need a projector, a camera, a computer, and a software that can process the images and generate the 3D model. The projector and the camera should be aligned and calibrated to ensure accurate results. The projector should have a high contrast and resolution, and the camera should have a high frame rate and sensitivity. The computer should have enough memory and processing power to handle the large amount of data. The software should be able to align, merge, and refine the scans from different views.

3 How to scan an object?

To scan an object with structured light scanning, you need to set up your scanning area in a dark and stable environment, where there is no interference from ambient light or movement. Place the object on a turntable or tripod, and position the projector and camera opposite to each other, facing the object. Connect the projector and camera to your computer, and launch the software. Select the structured light scanning option, and follow the instructions to calibrate your devices. Adjust the settings to optimize the quality and speed of your scan. Start scanning by projecting a sequence of patterns onto the object, while the camera captures images. Monitor the progress on your computer screen, rotating the object or moving the devices to scan different sides of it until you cover the whole object. Then process the scan by aligning and merging scans from different views, creating a 3D mesh of the object. You can edit and refine it, apply texture and color, and export it to other formats such as STL, OBJ, or PLY for further use.

4 What are the advantages?

Structured light scanning offers several advantages when compared to other 3D scanning methods. It can capture high-resolution 3D models with fine details and realistic textures, as well as complex and irregular shapes. Moreover, it is capable of scanning quickly and accurately with minimal noise and distortion, and can even scan in color without requiring additional sensors or cameras. Additionally, this method can be done with relatively affordable and accessible equipment, such as a projector and a webcam.

5 What are the limitations?

Structured light scanning has some limitations that should be taken into account, such as needing a dark and controlled environment with no external light or movement. It cannot scan transparent, reflective, or shiny objects, as well as very large or very small objects. Multiple scans and manual alignment may be necessary to capture the whole object, especially if it has occluded or hidden parts. Post-processing and editing can also be needed to improve the quality and accuracy of the 3D model, such as smoothing, filling, or trimming.

6 Here’s what else to consider

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