Opening the paper…
Figure from the original question paper What is the role of the Gaussian blur in the Canny edge detection algorithm, and how does the choice of the standard deviation parameter affect the performance of edge detection? Which option do you think best describes the role of the Gaussian blur and its relationship with the standard deviation parameter in the Canny edge detection algorithm? Which property of the SIFT descriptor is primarily responsible for its resilience to changes in scale, viewpoint, and illumination?