Images all the way.ViSCO Technologies Corporation

Images all the way.ViSCO Technologies Corporation

Technology Information
Geometric Shape Pattern Matching

Geometric Shape
Pattern Matching

Instead of using pixel images as regularized correlation searches do, features of an image (geometric shape data) are extracted to specify the location.

For example, a geometric shape search is better than a regularized correlation search in the following cases:

  • When the targets' profile shape is the same, but conditions inside the profile differ (a different gray level or pattern)
  • Partially damaged
  • Tilted parts
  • Different part sizes

Because only geometric configuration information is included, data is more manageable than before.

Geometric configuration matching results show the XY coordinates and scores (NOT correlation factors). Generally, geometric shape pattern matching is said to have higher repeat positional accuracy than a regularized correlation search.

ViSCO's proprietary geometric configuration matching: GradFinder®

GradFinder®conducts geometric configuration pattern matching for high-speed, high-accuracy image detection with a proprietary ViSCO algorithm.
The pattern matching function embedded in the alignment tool extracts geometrical features (e.g., edges) from the image. The position with the highest matching level of geometric configuration features is used as the answer.

Our proprietary feature extraction technology, adoption of matching methodology to reduce blur/noise influence, and consideration of various lighting conditions/variation lead to the realization of product stability and improved reliability.

For brightness/contrast changes

For partial gray level differences

Changes in the inner pattern or background

Reduced influence of blur/noise

For orientation variations

Geometric shape
pattern matching applications

■Alignment, as guidance for robots or the like
■Alignment, as preprocessing that inspects or measures

The application range of geometric configuration pattern matching is the same as that of regularized correlation searches, but geometric configuration pattern matching offers more options because it can be used to deal with changes.

Introduction to our company

As an expert group in the field of visual inspections and image processing inspections, we provide products that continue to lead the industry.

We are an expert group in the field of visual inspections and image processing inspections. We are not just a manufacturer. Instead, we are a visual inspection and image processing inspection system manufacturer that combines knowledge of and experience related to image processing algorithms, optical technology, electronics, and machinery in order to provide comprehensive consulting as a development engineering company.

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