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9/10 Engineers Say Knowing These Machine Vision Tips Were Keys for Success Vol. 1

March, 2020

The LumiTrax vision system uses our newly developed ultra high-speed camera and ultra high-speed segmented lighting to capture the target workpiece. This imaging method takes multiple images, lit from different directions, to create shape (surface irregularities) and texture (pattern) images. This makes it possible to eliminate workpiece variations and environmental influences that prevent stable surface inspections, enabling anyone to perform imaging easily—a task that conventionally required large amounts of time and experience.

How do you eliminate surface condition variations to enable stable inspections?

By taking pictures at different lighting angles and using light to cast shadows you can combine the photos to create one single image.

1 Ultra high-speed images are captured with controlled, partial lighting from different directions.

Upper light image

Right light image

Left light image

Lower light image

2 The difference in light intensity at each pixel among the different images is analyzed and used to separate shape(surface irregularity) and texture (pattern) images for processing.

Texture image

Shape image

Pixel A light intensity

Pixel B light intensity

Pixel C light intensity

Pixel D light intensity

How do you eliminate the influence of shapes to detect only foreign particles?

By implementing an inspection method that supports changes for better defect detection.

  1. There are small foreign particles on the inner side surface and bottom of a container.
  2. With conventional binary processing,these particles cannot be detected since their brightnesses are close to that of the dark section inside the container.
  3. The stain inspection tool can stably detect the foreign particles alone by ignoring shading differences.

Chip inspection on a metal surface

Factors such as remaining cleaning agent, dirt, and minor hairline fractures are filtered out so that only deep defects such as scratches and chips are detected.

Printed character inspection on a film surface

Glare, which negatively affects inspections, is eliminated to enable stable inspections.

Metal casting surface embossed/engraved character inspection

From a random casting surface, the embossed or engraved characters with greater concave-convex information are emphasized.