How to copy polygon from the image?

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1.00/5 (2 votes)

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I have Emgu image:

C#

Image<Bgr,byte> image = new Image<Bgr,byte>("image.jpg");

All pixels that inside green triangle I want to copy to the new image called:

C#

Image<Bgr,byte> copiedSegment;

Any idea how to implement it if I have coordinates of the green triangle contour.

Thank you in advance!

Posted 29-Nov-13 4:58am

Mich_90

Updated 29-Nov-13 12:54pm

v4

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Richard MacCutchan 29-Nov-13 14:57pm

What a pity that the green triangle is invisible.

[no name] 29-Nov-13 18:42pm

lolz

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BillWoodruff · Answer 1 · 2013-11-29T13:31:00

Solution 2

Before seeing your post, I'd never heard of the Emgu CV library for .NET. In less than one minute browsing their web-site I found a code example of shape detection, including the ability to recognize a triangle [^].

So: why can't you use the Emgu facility to achieve your goal ?

Posted 29-Nov-13 13:31pm

BillWoodruff

ExcelledProducts CEO · Answer 2 · 2013-11-29T12:49:00

Well considering that the green triangle will only show up with your x-ray eyes.

(GENERAL ANSWER BECAUSE THERE IS NO TRIANGLE)
If you have the three points of the triangle you can simply create a bitmap with an area that will satisfy the triangle. Assumming that the color green is the same. You can filter out everything that isn't the same color of the triangle making it transparent. The rest will be the magical triangle.