It's like SIFT, but faster because it uses the Integral images to speed up image operations. Any box region sum can be calculated in constant time using:Sum=D−B−C+A Gaussian vs. Box Filter Left: Gaussian FilterA Gaussian filter is smooth and continuous.It computes second-order derivatives of the image (like ∂²/∂x²) to detect blobs or corners.Precise but computationally expensive. Right: Box Fil..
