how to compare objects present in two different images? what are the methods available?

i have two pictures with same object in two different positions. i need to compare the images and identify the object. what are the possible methods?

Answer 1

[Stalin Samuel]

1. http://in.mathworks.com/help/vision/examples/object-detection-in-a-cluttered-scene-using-point-feature-matching.html
2. http://in.mathworks.com/discovery/object-recognition.html