Fig. 2

Stroke analysis via Hough Transform. (a) Line in a parameter space. For the rest three subimages, X-axis represents the degree of stroke from [−90, 90], the y-axis represents the distance of the line-segment stroke from the origin point. (b) Accelerator space is obtained by Hough transform. The color (yellow) means larger values in the accelerator space, while the color (red) means smaller values in the accelerator space. Larger values indicate there are larger possibilities of strokes. (c) the results of a two-sample t-test for the strokes between patients and HC (p-value), where we set the strictest threshold p < 0.001, due to the effect of multiple comparison (FDR correction) (d) correlation coefficients, where we only show the correlation coefficient greater than 0.3. The X-axis represents the angle of the strokes. Y-axis represents the distance from the origin to strokes