Blob analysis library

At a glance
  • Image segmentation based on the gray scale of connected objects
  • Object labeling
  • Geometric feature extraction
  • Flexible Masks
  • High performance, especially for large images and images with numerous objects

Compare Where to buy

<a target="_blank" href="https://www.euresys.com/Products/Machine-Vision-Software/Open-eVision-Studio/Open-eVision-Studio" >Open eVision Studio</a>: Evaluation, prototyping and development tool
Open eVision Studio: Evaluation, prototyping and development tool

Open eVision Studio is the evaluation, prototyping and development tool of Open eVision. Its intuitive graphical user interface allows you to call and immediately see the result of any of eVision's functions. A scripting function generates the corresponding code, which can then be copied and pasted into your application. Open eVision Studio is free (when using Open eVision 2.0 and above) and can be downloaded to evaluate the performance of Open eVision.


  • Image Encoding:
    • Construction of the runs: Segmentation using Grayscale single threshold, Grayscale double threshold, Color single threshold, Color range threshold, Reference image, Image range, Labeled Image or Binary Image
    • Pixel aggregation
    • Object construction: aggregation of the runs into objects
    • Hole construction: aggregation of the runs into holes
    • Continuous mode for web inspection applications using line-scan cameras
  • Object feature extraction (geometric parameters computation)
  • Object selection and sorting according to any feature value

Choose the most suitable Licensing System
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.

EasyObject Description
EasyObject Description

The EasyObject library handles image segmentation, i.e. the decomposition of images into separate objects, also called blobs. Once the objects have been constructed, they can be handled as independent entities. Various geometric parameters or features, such as area, width, or ellipse of inertia, can be computed for each object. Objects of interest can be selected by means of their position or of their computed features. EasyObject also supports the inspection of holes in defined objects. Holes are managed as the objects themselves, benefiting from the same geometrical features. EasyObject manages the relationship between objects and holes, defining parent objects for holes.

Object/blob features available
Object/blob features available

  • Position: Limit (top, bottom, left, right), Gravity center (X and Y), Weighted gravity center (X and Y)
  • Extent: Area (pixel count), Feret box (center X and Y, height, width with distinct orientation angles at 22, 45, 68 degrees), Bounding box (center X and Y, height, width), Minimum enclosing rectangle (angle, center X and Y, height, width)
  • Starting point of the object contour (X and Y)
  • Longest run
  • Run count
  • Object number (index)
  • Statistics: Pixel gray-level value (average, deviation, variance, min and max)
  • Ellipse of Inertia: Eccentricity of the ellipse of inertia, Ellipse, Second order geometric moments
  • Convex hull

Flexible Masks
Flexible Masks

EasyObject supports the restriction of the blob analysis to complex- or disconnected-shape regions of the image thanks to the Flexible Masks that are available for the encoding functions. EasyImage can also generate Flexible Masks from an encoded image.

Graphic representation
Graphic representation

The objects can be drawn onto the source image. The following blob features have a pre-set graphical representation:

  • Objects
  • Diagonals
  • Bounding box
  • Convex hull
  • Ellipse
  • Feret Box
  • Feret box with an angle of 22°
  • Feret box with an angle of 45°
  • Feret box with an angle of 68°
  • Gravity center
  • Minimum enclosing rectangle
  • Weighted gravity center

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.
  • The EasyDeepLearning library is only available in the 64-bit Open eVision library.
  • Open eVision can be used on the following operating systems:
    • Windows 10 (32- and 64-bits)
    • Windows 8 (32- and 64-bits)
    • Windows 7 (32- and 64-bits)
  • Since Open eVision 2.6, discontinued support of:
    • Windows Vista 32-bits Service Pack 1
    • Windows XP 32-bits Service Pack 3
    • Windows Embedded Standard 2009 32-bits
  • The Open eVision installer does not allow installation on virtual machines.
  • Minimum requirements:
    • RAM: 8 GB
    • Display size: 800 x 600. 1280 x 1024 recommended.
    • Color depth: 16 bits. 32 bits recommended.
    • Between 100 MB and 2 GB free hard disk space for libraries, depending on selected options.
  • Supported Integrated Development Environments and Programming Languages:
    • 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)
    • Microsoft Visual Studio 2015 (C++, C#, VB .NET, C++/CLI)
    • Microsoft Visual Studio 2017 (C++, C#, VB .NET, C++/CLI)
  • Since Open eVision 2.6, discontinued support of:
    • Microsoft Visual Studio 6.0 SP6 (C++, Basic)
    • 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
Optional accessories
Presence Check

Presence / Absence check

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

Surface analysis

EasyImage is used to reveal the surface defects, and the blob analysis functions of EasyObject is able to segment and measure them.
Object Location

Object positioning for pick and place machines