mvIMPACT Match

mvIMPACT Match

The pattern matching module includes a set of functions to find predefined patterns in images. There are numerous applications for this task such as searching for objects, recognizing parts, and image alignment. To find the location of a specified pixel pattern in arbitrary images the algorithm is robust enough to tolerate varying luminance conditions as well as slight rotations of the pixel pattern.

The search speed can be optimized by the following search parameters:

  • Search window
  • Model's center point
  • Acceptance level
  • Certainty level
  • Positional accuracy
  • Number of matches
  • Subsampling factor
  • Step width
  • Presetting model pixel
  • Détails
  • Téléchargements

Finding reference features in an image is an essential step in inspection and quality control. In frequent situations, ensuring that the parts are always presented to the imaging device exactly in the same position is not feasible. On the opposite, some amount of mechanical play is always allowed by the fixturing, or objects can be handled in bulk.

Pattern matching is a general purpose tool to find arbitrary shapes in an image and measure their position with high accuracy, allowing to adequately move regions of interest for further visual inspection. Pattern matching is also used for precise robot guidance.

In addition to location and registration, pattern matching can also be used for counting, absence/presence check and even recognition: a returned matching score allows assessing the resemblance of an occurrence with the original model.

Frame type identification and alignment check
Frame type identification and alignment check
Score-based recognition
Score-based recognition
Learning

The training phase allows showing a sample image of the item to be matched. For convenience, the sample is usually taken from a rectangular region of interest. Anyway, any pixel can be assigned a "don't care" attribute, meaning that the shape and contents of the pattern can be arbitrary. The pattern center can be freely specified, too.

Searching

The search takes place in a rectangular window. An arbitrary number of matching occurrences can be requested. After the search, the positions and scores can be queried.

Accuracy, robustness and speed

The pattern matcher is exploiting all the gray-level information available. This means that interpolation techniques allow measuring positions with sub-pixel accuracy, possibly lowering the resolution requirement of the camera sensor.

The pattern matching algorithm uses the well-known normalized correlation technique. Changes in contrast or lightness will not influence the search at all, relieving from the need of strict illumination control.

When the pattern can be confused with other features in the scene, false matches can be discriminated by means of the search score.

For time performance optimization, a few relevant technical parameters are exposed to allow fine tuning and provide better control on the coarse-to-fine searching process.

Datasheets
mvIMPACT 3D Display mvIMPACT 3D Display | 46.8 kB

Datenblatt / Datasheet mvIMPACT 3D Display

mvIMPACT Barcode mvIMPACT Barcode | 101.8 kB

Datenblatt / Datasheet mvIMPACT Barcode

mvIMPACT Base mvIMPACT Base | 277.5 kB

Datenblatt / Datasheet mvIMPACT Base

mvIMPACT Blob mvIMPACT Blob | 103.9 kB

Datenblatt / Datasheet mvIMPACT Blob

mvIMPACT Color mvIMPACT Color | 75.6 kB

Datenblatt / Datasheet mvIMPACT Color

mvIMPACT Data Matrix mvIMPACT Data Matrix | 56.2 kB

Datenblatt / Datasheet mvIMPACT Data Matrix

mvIMPACT Focus mvIMPACT Focus | 126.4 kB

Datenblatt / Datasheet mvIMPACT Focus

mvIMPACT GMM mvIMPACT GMM | 85.5 kB

Datenblatt / Datasheet mvIMPACT Geometric Model Matcher

mvIMPACT Match mvIMPACT Match | 145.9 kB

Datenblatt / Datasheet mvIMPACT Match

mvIMPACT Measure mvIMPACT Measure | 60.5 kB

Datenblatt / Datasheet mvIMPACT Measure

mvIMPACT OCR mvIMPACT OCR | 93.2 kB

Datenblatt / Datasheet mvIMPACT OCR

mvIMPACT e 2012-04 MR mvIMPACT e 2012-04 MR | 509.7 kB

Datenblatt / Datasheet mvIMPACT

Manuals

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mvIMPACT Release / Beta for Windows XP, Vista, 7

You can evaluate mvIMPACT SDK for 30 days free of charge once. Afterwards, you will need a licence! If you are using a dongle for licensing mvIMPACT, you have to use the latest USB dongle in combination with the 64bit version!

mvIMPACT-6.8.461.6555-19823-x64 mvIMPACT-6.8.461.6555-19823-x64 | 136,196.0 kB

mvIMPACT SDK 64 Bit Release Windows (XP, Vista, 7 / .NET 4.0 compliant, MSI, SDK Version 6.8.461.6555)

mvIMPACT-6.8.461.6555-19823-x86 mvIMPACT-6.8.461.6555-19823-x86 | 131,760.0 kB

mvIMPACT SDK 32 Bit Release Windows (XP, Vista, 7 / .NET 4.0 compliant, MSI, SDK Version 6.8.461.6555)

mvIMPACT Nightly Builds for Windows XP, Vista, 7

Nightly builds are tested exemplarily and should be tested by oneself before use!

mvIMPACT-6.8.1148.7242-20516-x64 mvIMPACT-6.8.1148.7242-20516-x64 | 125,276.0 kB

mvIMPACT SDK Nightly Build (64 Bit, Build , Windows XP, Vista, 7)

mvIMPACT-6.8.1148.7242-20516-x86 mvIMPACT-6.8.1148.7242-20516-x86 | 121,328.0 kB

mvIMPACT SDK Nightly Build (32 Bit, Build , Windows XP, Vista, 7)

mvIMPACT progiciels pour mvBlueLYNX-X
mvIMPACT IPK packages for mvBlueLYNX
USB dongle driver for Windows XP, Vista, 7

Modifications possibles sans préavis, date 11/2011