If i have a specific feature as an image how do i extract that from a larger image in matlab

I was thinking of coverting the image with feature for example a victory sign to a filter and then somme how convolt that filter over a bigger picture to find if there is a victory sign in the image.

Answer 1

[Image Analyst]

See https://www.mathworks.com/help/vision/ug/object-detection-in-a-cluttered-scene-using-point-feature-matching.html

which requires the Computer Vision Toolbox.

Otherwise you might try a deep learning solution: YOLO

Answer 2

[yanqi liu]

yes，sir，may be use imresize to get the appropriate image matrix

[DGM]

Imresize can neither identify nor extract a feature of interest within an image; it can only resize the image.

Answer 3

[DGM]

If you're talking about a very forgiving case where the smaller image is known to be a subset of the larger image itself, then you might use normxcorr2() to find its location.

https://www.mathworks.com/help/images/ref/normxcorr2.html

https://www.mathworks.com/help/images/registering-an-image-using-normalized-cross-correlation.html

Otherwise the answer will be a lot more complicated.

Answer 4

[Image Analyst]

My normalized cross correlation demo is attached.