Bioinspired figure-ground discrimination via visual motion smoothing
Fig 4
Dissecting the figure-ground discrimination process in the pathway from the EMD array to the Ir module.
(A) Snapshots of the segmented foreground (white area) and background (black area) at three stages: the output of the EMD array (left column), the input of the Ir module (middle column), and the output of the Ir module (right column). The segmentation threshold was set as 50% maximum (top row) or 10%, 30%, 70%, and 90% maximum (bottom row). The stimulus was a textured 25° bar (80% contrast), which was moving against a similarly textured background at 66°/sec (upper leftmost: space-time plot). Data are presented based on the input frame at which the bar passed the middle of the visual field. (B) Instantaneous F-measure throughout the entire stimulus presentation period. It was evaluated by using a segmentation threshold of 50% maximum at three stages: the output of the EMD array (green curve), the input of the Ir module (light blue curve), and the output of the Ir module (dark blue curve). (C) and (D) are the same as (A) and (B), respectively, except that the stimulus background was moving in the direction opposite of the bar. For all simulations, the receptive field of the units in Ir and Il on the EMD array was set as 10°×10°.