1. A method for estimating a blur direction of motion blur in a blurred image, the method comprising the steps of: blurring the blurred image along a first test direction to create an artificially blurred first test image; blurring the blurred image along a second test direction that is different than the first test direction to create an artificially blurred second test image; and evaluating the test images to estimate if one of the test directions is similar to the blur direction.