This demo illustrates the application of PMS (Photometric Stereo) technology for high-precision 3D surface estimation and dent detection on IC packages.

▲System Configuration

PMS estimates surface shape by using multiple images captured from a fixed camera position under different lighting directions. By analyzing brightness variations caused by the differing illumination angles, it effectively detects subtle surface anomalies such as dents and scratches.

PMS inspection enables the visualization of subtle surface irregularities that are difficult to detect using conventional optical systems.

▲Left: Standard Lighting Right: Dent Detection with PMS Lighting

▲Image 1 is a composite of red, green, and blue lighting

The 3-sensor camera integrates three sensors within a single camera body, enabling simultaneous capture of three-color images (red, green, and blue) in a single shot. While typically used for capturing color images, in this demo, it is employed to simultaneously capture three phase-shifted images. Normally, PMS inspection requires multiple captures (three times in this case) under illumination from different angles, which necessitates that the object remains stationary during imaging. By combining the 3-sensor camera with PMS technology, red, green, and blue lights—each physically positioned at different angles—are illuminated simultaneously. This allows capturing three phase-shifted images in one shot, enabling PMS inspection of moving objects.

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