How to identify object using shape?

I want find object in given image for example I have butterfly image with matrix size is 123X235 and I given image contain butterfly with different size but same shape (ex:123X235,24X54,235X345,10X32).It is possible to identify the butterfly image ?

Answer 1

[Image Analyst]

Yes. Use imresize() and then run your algorithm on it. Or make an algorithm smart enough to identify the butterfly without depending on the image matrix size being a certain size.

[CHINNI VENKATA RAMESH]

Sir all different sizes of butterfly exist in one image.

[Image Analyst]

I could not have known that from your description and because you didn't post an image. I think this may be too difficult of a project for you if you want to identify each butterfly individually. You could look up the fields of CBIR and convolutional neural networks, but I think you'll be getting in over your head. I think you should try something simpler.

Here's an example where they found jets in an image using the Hausdorf distance. http://cgm.cs.mcgill.ca/~godfried/teaching/cg-projects/98/normand/main.html

[CHINNI VENKATA RAMESH]

sir i uploading image

[CHINNI VENKATA RAMESH]

[CHINNI VENKATA RAMESH]

[Image Analyst]

Well for that it's really easy. Just convert to hsv color space and threshold on saturation and call bwareafilt() to extract only the butterflies. But then you'll show me a picture of a flock of monarch butterflies coating a tree and ask me to count them and of course that simple algorithm won't work for that image.

See color segmentation methods in my File Exchange http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 , like this one on hue segmentation that you can adapt to be on saturation segmentation.