|Errors in Line Estimation
Figure 1: Click repeatedly on the figure to see zoom ins illustrating the fitting of the curve.
As you can see, in this pattern the circle appears to be distorted. This is predicted by the bias in the estimation of the intersection points between the circle and the lines of the background.
The estimation of the circle requires a few computations which we modeled as follows:
Luckiesh Pattern in Motion
Figure 2: Click on the pattern and move your cursor to change the orientation of the background lines.
Since the value of the bias depends on the direction of the intersecting lines, changing the direction of the background lines causes a change in the bias and thus a change in the estimated curve, with the circle bumping at different locations.