title: Matching a rotated bitmap to a collage image
body: <p>My problem is that I have an image of a detailed street map. On this map, there can be a certain small image of a sign (such as a traffic light icon) rotated at any angle, maybe resized. I have this small image in a bitmap. Is there any algorithm or technique by which I can locate this bitmap if a copy of it exists, rotated and maybe resized, in the large collage image?</p>
  
  <p>This is similar to the problem with Augmented Reality and locating the marker image, but mine is only 2D with no perspective distortion.</p>
  
  <p>Edit: The small bitmap and the copy of it in the collage image with which I want to match are approximately the same size, maybe 30% maximum size difference. The rotation is pure 2D, no shearing or any distortion.</p>