Pattern Matching Library

At a glance
  • Pattern matching using normalized correlation
  • Sub-pixel accuracy
  • Rotation and scaling support
  • Detection of multiple pattern occurrences
  • Support of gray scale and color images
  • Support of "don't care" areas

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Open eVision Eval

Open eVision Eval is the free evaluation tool of Open eVision. It will allow you to evaluate the features of Open eVision functions in your application, using your images or the numerous sample images provided with. Open eVision Eval will also help you get familiar with the Open eVision tools.

Download Open eVision Eval

Standard, offset-normalized, gain-normalized and fully-normalized correlation

The correlation is computed on grey scale or color images. To cope with pattern lighting variations, pattern images are normalized. EasyMatch provides four normalization modes, depending on whether a grey-scale gain and/or offset compensation are used.

Variable accuracy, up to sub-pixel level

The accuracy with which the pattern is measured can be chosen (the less accurate, the faster). A one tenth-of-a-pixel accuracy can be achieved.

Non-square pixels

When images are acquired with non-square pixels, rotated objects appear skewed. Taking the pixel aspect ratio into account can compensate for this effect.

EasyMatch Description

EasyMatch is a gray-level and color pattern matching library. It lets you train the system on a reference pattern and afterwards locate its occurrences in other images.

This tool is very convenient when the position of a given part is unknown in the field of view, or if the presence of parts must be controlled. The library works by using normalized correlation method, i.e. measuring discrepancies between the pattern and the target image.

Normal, inverse or mixed contrast

Because of particular lighting effects, an object can appear with inverted contrast (white on black instead of black on white or conversely). Depending on the application, it can be useful to keep inverted instances or to disregard them. Three contrast modes are available: consider positive occurrences only, negative occurrences only or both.

Don't care pixels

When the pattern cannot be inscribed in a rectangular ROI, the surrounding of the pattern can be ignored by setting the pixels values below a threshold level. These pixels will not take part in the matching process. The same feature can be used if parts of the template change from sample to sample.

Choose the most suitable Licensing System

  • Open eVision Dongle-based Licenses: Dongle-based Licenses offer the flexibility to be transferred from a PC to another. To purchase a Dongle-based License, select one of the Euresys dongles (USB or Parallel) plus the license(s) to be stored on this dongle. Licenses are delivered as activation codes, which are stored on the dongles.
  • Open eVision Software-based Licenses: Software-based licenses do not require any dongle, they are linked to the PC on which they have been activated. Licenses are delivered as activation codes and can be managed online.

Multiple pattern occurrences

EasyMatch is able to find several occurrences of a pattern, up to a user-defined number.

Translation, rotation and isotropic/anisotropic scaling

To find the best matches between the pattern and target image, the target is allowed to translate horizontally and vertically. Additionally, it can be allowed to rotate and/or to change its scale in the X and Y directions simultaneously or independently. The rotation angle and scale factors vary in a user-specified interval. All degrees of freedom can be combined at will.

Gray-level and color images

EasyMatch works with 8-bit gray-scale images as well as 24-bit RGB images.

Host PC Operating System
  • Open eVision is a set of 32-bit and 64-bit libraries that require a processor compatible with the SSE2 instruction set.
  • Open eVision can be used on the following operating systems:
    • Windows 10, 8 and 7 (32- and 64-bits)
    • Windows Vista 32-bits Service Pack 1
    • Windows XP 32-bits Service Pack 3
    • Windows Server 2008 32-bits
    • Windows Server 2008 R2 64-bits
    • Windows Server 2003 32-bit Service Pack 1
    • Windows Embedded Standard 2009 32-bits
  • The Open eVision installer does not allow installation on virtual machines.
  • Minimum requirements:
    • Display size: 800 x 600. 1280 x 1024 recommended.
    • Color depth: 16 bits. 32 bits recommended.
    • Between 20 MB and 300 MB free hard disk space for libraries, depending on selected options.
    • Between 60 MB and 400 MB free hard disk space for development tools, depending on selected options.
APIs Supported Integrated Development Environments and Programming Languages:
  • Microsoft Visual Studio 6.0 SP6 (C++, Basic)
  • Microsoft Visual Studio .NET 2003 SP1 (C++)
  • Microsoft Visual Studio 2005 SP1 (C++, C#, VB .NET, C++/CLI)
  • Microsoft Visual Studio 2008 SP1 (C++, C#, VB .NET, C++/CLI)
  • Microsoft Visual Studio 2010 (C++, C#, VB .NET, C++/CLI)
  • Microsoft Visual Studio 2012 (C++, C#, VB .NET, C++/CLI)
  • Microsoft Visual Studio 2013 (C++, C#, VB .NET, C++/CLI)
  • Borland C++ Builder 6.0 update 4 (C++)
  • CodeGear C++ Builder 2009 (C++)
  • CodeGear Delphi 2009 (Object Pascal)
  • Embarcadero RAD Studio XE4 (C++, Object Pascal)
  • Embarcadero RAD Studio XE5 (C++, Object Pascal)
Ordering Information
Product code - Description


EasyFind and EasyMatch are able to quickly and reliably locate PCB and other fiducial marks in the image.

Pick and place

EasyFind and EasyMatch are able to quickly and reliably locate fiducial components in the image.

Wire bonding and Die bonding

EasyFind and EasyMatch are able to quickly and reliably locate fiducial marks in the image.

LED inspection

Presence / Absence check

EasyImage gray-scale analysis functions are used for simple presence/absence checks

Open eVision
  Download File size Operating system
Release Notes Open_eVision_1_2_10_Release_Notes.pdf 0.8 MB Windows
Documentation Open_eVision_1_2_10_ActiveX_Documentation.pdf 13 MB Windows
Open_eVision_1_2_10_Cpp_Documentation.pdf 14 MB Windows
Open_eVision_1_2_10_DotNet_Documentation.pdf 15 MB Windows
Open_eVision_1_2_10_Migration_Guide.pdf 0.4 MB Windows
Setup Files Open_eVision_32bit_Libraries_1_2_10.exe 85 MB Windows
Open_eVision_64bit_Libraries_1_2_10.exe 71 MB Windows
Open_eVision_Development_Tools_1_2_10.exe 0.2 GB Windows
Open_eVision_Eval_1_2_10.exe 76 MB Windows
Sample Programs open-evision-project-sample-win-x86-1.2.10.zip 61 kB Windows
clinical-analysis-win-x86-1.2.10-application-sample.zip 1.6 MB Windows
fuse-inspection-win-x86-1.2.10-application-sample.zip 2.2 MB Windows
ocr-lot-mixing-win-x86-1.2.10-application-sample.zip 4.1 MB Windows
  • Borland Delphi 6.0 was supported up to Open eVision
  • Borland Delphi 2006 was supported up to Open eVision
  • Borland C++ Builder 2006 was supported up to Open eVision
  • Microsoft Windows 2000 was supported up to Open eVision
  Download File size Operating system
Release Notes eVision Release Notes.pdf 0.4 MB Windows
Documentation Documentation Update for CD2006-1.pdf 0.5 MB Windows
Readme - eVision Update Tool.pdf 0.8 MB Windows
Documentation Update since CD2006-1.pdf 0.2 MB Windows
Setup Files eVision_Update_6_7_1_490.exe 38 MB Windows
eVision_6_7_1_0.iso 0.5 GB Windows
Please select the boxes above to find supported cameras you’re looking for!
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