How to Extract a certain Shape from Image
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I would like to distinguish between "background" pixels and the "orange plastic bag" pixels in order to manipulate those pixels (count, hist, etc).
I can't use indx = I(I ~= 1) because there are some white pixel inside the orange plastic bag.
Moreover, this bag is aligned but it might be rotate in other images.
Thanks.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/151121/image.png)
1 comentario
Rakshit Kothari
el 18 de Feb. de 2013
So what you basically need is some form of object recognition, am i correct? If you just need to extract the bag of chips, image segmentation using Otsu's method is probably what you need.
If you need recognition i suggest you read up on SIFT or SURF.
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Walter Roberson
el 18 de Feb. de 2013
convert to gray, threshold to select non-white, imfill() 'holes'. The result should be a mask you can use to select from the larger image.
2 comentarios
Walter Roberson
el 18 de Feb. de 2013
That's why you imfill() 'holes', to recover the "inside" part.
Rakshit Kothari
el 18 de Feb. de 2013
So what you basically need is some form of object recognition, am i correct? If you just need to extract the bag of chips, image segmentation using Otsu's method is probably what you need.
If you need recognition i suggest you read up on SIFT or SURF.
If its a quick thing that you are looking for, just invert the image, threshold and then use REGIONPROPS with filled holes option.
If you need the shape of the object:
Ratio = Area of Object/Area under bounding box
If Ratio is a reasonably high value, you object is a square or a rectangle. If its lower, its probably a triangle or circle.
1 comentario
Darshan Drviruz
el 21 de Oct. de 2017
Would you please explain this by using code? i couldn't understand well
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