How to detect edges from particular area or portion of the image?

asked 2017-03-01 06:07:03 -0600

Uma
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updated 2017-03-01 06:18:58 -0600

Eduardo
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Hai, Is it possible to detect edges from particular area of image(For example , if a select the particular area from the image using Rectangular box, I need to find the edges of the objects that are covered by rectangular box). If so how to do that using OpenCV and C++ or python ? Please provide me steps I need to follow.

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answered 2017-03-01 06:42:08 -0600

StevenPuttemans

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That is fairly simple.

Drawing the rectangle box can only be done if you store the corners of the box somewhere. You can take a look at the opencv_annotation application on how this is done in OpenCV and C++ but this is highly portable to Python.
Once you have the rectangle, you can get a select area of an image by doing Rect region; Mat small = large(region).clone().
Now perform an edge detector on that smaller image.
If you want you can then overlay this result with the original image by copying the content back.

Good luck!