Bioinspired figure-ground discrimination via visual motion smoothing
Fig 5
Effect of the membrane time constant τm on figure-ground discrimination.
(A) Figure-ground segmentation effect achieved with the same stimulus as that used in Fig 4A. Leftmost panel: space-time plot of the stimulus. The 1st to 3rd rows: snapshots of the segmented foreground (white area) and background (black area) at three stages (the output of the EMD array (1st row), the input of the Ir module (2nd row), and the output of the Ir module (3rd row)). The snapshots are presented based on the input frame at which the bar passed the middle of the visual field. The segmentation threshold was set as 50% maximum. The corresponding τm value is indicated at the top. The 4th row: instantaneous F-measures throughout the entire stimulus process evaluated at 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). (B1) Same as (A), except the stimulus was replaced by ‘Theta Figure in Moving Background’ (leftmost panel). The stimulus featured a background moving to the left at 66°/sec. The bar shared exactly the same motion as the background, whereas the elements within the bar coherently moved to the right at 66°/sec. (B2) Same as (B1), except the dot size of the stimulus was changed from 2.6° to 7.9°.