Mastering 3D Scanning: A Guide to Coded and Non-Coded Markers

HANGZHOU, China - Feb. 1, 2024 - PRLog -- When utilizing a handheld 3d scanner (https://www.ireal3dscan.com/3d-products/), you might notice distinctive circular black-and-white patches attached to the objects undergoing scanning. These are known as markers, but what exactly is their function?

The use of a handheld scanner involves dealing with a limited measurement area during each scan. Consequently, aligning data from multiple scans becomes essential. While several methods exist, including feature-based, texture-based, and hybrid techniques, marker-based alignment is often the preferred choice for small to medium-sized scanners. The circular patches mentioned earlier serve as markers in this context.

But what precisely are markers in 3D scanning?

Markers are commonly referred to as "reference points", "target points", or "tracking points", terms that more accurately reflect their function in the scanning process. Specifically, 'scanning marker points' refer to a subset known as non-coded marker points. On the other hand, coded marker points exist, each bearing unique codes to further enhance the precision and efficiency of tracking.

Coded Markers

Coded markers are widely used in photogrammetric systems, which are based on the principle of capturing images to reconstruct three-dimensional objects in space.

Coded markers play a pivotal role in photogrammetric systems, which rely on capturing images to reconstruct three-dimensional structures in space. These systems utilize the foundational principles of camera imaging and triangulation, as depicted in Figure 2, offering a conceptual framework for understanding the 3D reconstruction process inherent in photogrammetry.

Non-Coded Markers

Non-coded markers, prevalent in 3D scanning with devices like handheld lasers or stationary scanners from Scantech 3D (https://www.3d-scantech.com/), are pivotal for accurate alignment. Known for their circular design, these markers are the go-to choice for ensuring precise marker point alignment in various scanning applications.

Circular Shape Benefits: Non-coded markers are commonly circular to ensure consistent detection as ellipses by machine vision, regardless of angle. The ellipse's center offers a stable reference point, crucial for precise center determination.

Innovative Use of Markers in Scantech KSCAN-Magic Series

Unique Marker Design:

Coded Markers: The KSCAN-Magic (https://www.3d-scantech.com/product/kscan-magic-composite...) series use multiple non-coded markers to form a unique coded marker. This structure, distinct from traditional designs, ensures precise location determination with a central position for each coded point. Furthermore, these markers are crafted from magnetic rubber for effortless attachment to metal surfaces.

Non-Coded Markers: Reflective markers are preferred for their dependable performance in the non-coded category.

Synergistic Use of Coded and Non-Coded Markers:
Grasping these fundamental concepts about markers is essential for a deep comprehension of the nuances in 3D scanning technology. Thank you for taking the time to engage with this content. Should you have further inquiries or require more detailed information, the team of experts at iReal 3D (https://www.ireal3dscan.com/contact-us/) is always ready and eager to assist you.