EasyMatch - Matching Area Patterns

EasyMatch is a pattern matching library that allows users to learn and identify given patterns in an image.

A geometric pattern found in an image

Process

EasyMatch learns a pattern and finds exact matches:

• The pattern is learned by defining an ROI that contains the object to be matched (see Learn a Pattern).

• Images can now be searched for one or more occurrences of the pattern, which may be translated, rotated or scaled (an)isotropically (see Find Matches).

  • These matches are represented by a vector of EFoundPattern ^{.NET Python}.

  • Each EFoundPattern contains a Score, Center, Angle, ScaleX and ScaleY.

• EasyMatch scores positions (translation, rotation, scaling) by computing the correlation between the pixels of the learned pattern and the corresponding pixels of the image.

• EasyMatch supports both BW8 ^{.NET Python} and C24 ^{.NET Python} images.

Learning a pattern

Matching a pattern

Note

In practice, you can assume an accuracy of 1/20^th pixel in position and 1/10^th of a degree in rotation.

Contents

Learn a Pattern

How to learn a pattern from an image.

Learn a Pattern

Find Matches

How to find a learned pattern inside of an image.

Find Matches

Quick Links

Reference

List of all Classes, Structs and Enumerations of the EasyMatch library.

EasyMatch Library

Code snippets

Code snippets for the EasyMatch library.

EasyMatch

See also

The Match sample of eVision Studio illustrates how to use the EasyMatch library.