Image capturing

Capture clear and accurate images to enhance the reliability of your defect detection workflows.

To capture clear and accurate images, use the following guidelines:

Perpendicular camera angle

Hold the camera so that it is perpendicular to the surface that you are scanning. This camera angle helps to avoid distortion and preserve geometric accuracy.

Balanced lighting

Use balanced lighting to avoid overexposure or underexposure and help ensure that surface details are clearly visible.

Focus

Focus the camera on the surface of the object to avoid blur and capture sharp image details.

Motion blur

Use stable equipment and fast shutter speeds to prevent motion blur.

ISO noise

Adjust camera sensitivity settings to reduce noise and avoid grainy images.

Background disruption

Avoid clutter or obstacles that reduce surface visibility.

Ground Sampling Distance (GSD)

Use low GSD values to capture fine surface details clearly, such as cracks and texture. Lower GSD value images have good quality ratings. Higher GSD values make fine surface details indistinct or invisible. Higher GSD value images have bad quality ratings.

The following table shows the quality rating for GSD settings for objects that are larger than 1cm.

Table 1. GSD quality rating by object size and pixel resolution

Object size is greater than	GSD per pixel	Quality rating
1 cm	Greater than 10 mm	Bad
1 cm	5 mm	Challenging
1 cm	2 mm	Good
1 cm	Less than 1 mm	Very good
1 mm	Greater than 1mm	Bad
1 mm	0.5 mm	Challenging
1 mm	0.2 mm	Good
1 mm	Less than 0.1 mm	Very good
1/10 mm	Greater than 0.1 mm	Bad
1/10 mm	0.05 mm	Challenging
1/10 mm	0.02 mm	Good
1/10 mm	Less than 0.01 mm	Very good