Table 1.

Description of per-frame measurements derived from the segmentation and resulting ellipse fit of the segmentation mask of the mouse

Measurement	Measurement description
m00	Area
Perimeter	Perimeter of the mouse silhouette
x	Center x-position of ellipse-fit
y	Center y-position of ellipse-fit
w	Minor axis length for an ellipse-fit
l	Major axis length for an ellipse-fit
wl_ratio	Width divided by length of minor and major axis of ellipse fit
dx	Change in ellipse center x-position
dy	Change in ellipse center y-position
hu0	Hu moment 0
hu1	Hu moment 1
hu2	Hu moment 2
hu3	Hu moment 3
hu4	Hu moment 4
hu5	Hu moment 5
hu6	Hu moment 6