template matching

matchTemplate

asked 2016-06-19 05:57:20 -0600

Yannis
1

updated 2016-06-20 02:28:45 -0600

pklab

4284 ●7 ●30 ●60

Hello

In an image drawing (eg scanned) the user selects a specific region using a rectangle (some drawing object). This is the template. Alternatively it may be loaded from a list of images.

My application has to locate all the same (or similar depending on sensitivity) regions/objects that correspond to this template.

Is this something that can be accomplished with opencv?
Are there any samples?
My development environment is Visual Studio 2013 and c#

Thank you Yannis

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answered 2016-06-19 21:31:45 -0600

Tetragramm

7376 ●13 ●37

Try checking out the tutorials like this one HERE. They are quite informative, and have links to the documentation which is even more informative. Many questions can be answered just by reading these.

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1st OpenCV do not support C# directly.

The tutorial is fine but it should be improved because it always find something due to results normalization. described at point 9. This normalization make result relative to the current matching so that max score becomes 1 even if is a bad match.

If you want to accept or discard the matching, you have to use the *_NORMED version of methods because they provide output in a fixed range 0..1 where 1 means perfect match (with SQDIFF 0 means perfect). See this and this