Crop image on special color pixels

hi
i have some images contains some orange circles. i need to crop that circles from image... this circles location is not the same and is not stable.. their locations are variable... so i can't use ROI or use start point or end point or point of the center of that circle, because in every image it's in a different location and also there are a lot of images.

so how can i crop images on circles location? i think i must use colors for cropping but i don't know how,
thanks in advance