Detects unevenness and scratches by suppressing surface patterns using illumination from multiple segments
Application Examples of Appearance Inspection Using Photometric Stereo
Appearance inspection using photometric stereo with segmented lights
We’ll solve these challenges!
- Unable to reliably detect characters and scratches due to patterns or textures on the workpiece.
- Halation on the workpiece prevents stable detection.
- Different workpiece colors require separate optimization of the optical system.
Photometric stereo solves these challenges
Imaging Examples
Molded Character Inspection of Tires
Imaging example of black rubber products that are difficult to binarize
imaged by illumination from
4 segments
Images can be acquired without the influence of shadows caused by the central recess.In addition, surface irregularities can be enhanced, making characters appear more clearly.
Character inspection of patterned tiles
By removing patterns and extracting unevenness, it is possible to acquire images in which characters can be easily recognized.
Heat seal inspection
Removes the pattern and halation and obtains information on the unevenness of the heat seal.
System Configuration Example
4 segment
8 segment / 4 segment
Equipment Introduction
Segmented ring light with divided illumination areas.
Custom configurations are available, including illumination shape, size, number of segments, emitting color, and cable length.
PoE (Power over Ethernet) enabled LED Light Controller for 4 channels.
Digital control unit for 2 to 8 channels designed for ease of use in manufacturing sites
Compact and multifunctional DC input type control units (up to 4 channels)
Inspection Examples Using Photometric Stereo
- Application Example of Foreign Object and Surface Irregularity Inspection on Three-Dimensional Glossy Workpieces
→ Solution for Appearance Inspection of Glossy Three-Dimensional Workpieces - Application Example of High-Speed Conveyed Objects Using a Line Scan Camera
→ Line-Scan Camera + Photometric Stereo