Figure 3

Analysis of results on synthetic images. Analysis of results on synthetic images with different noise levels, the actual orientation is arctangent of 1/3 (18.4 degrees), the arrows overlaid on (a-c) stand for the orientations estimated. (a) Synthetic image, noise: mean = 0, normalized variance = 0%; (b) Synthetic image, noise: mean = 0, normalized variance = 50%; (c) Synthetic image, noise: mean = 0, normalized variance = 100%. (d) Errors of the estimated orientation compared to the actual value.