EE/CSE 576: Image Understanding

Spring 2001

The output file produced by fex looks like this:

#<image cols> <image rows>
#Lines
zero or more line descriptions
#
#CircularArcs
one or more circular arc descriptions

If there are no circular arcs detected, the whole section (including the comment lines) will be missing.

A line description is a single line with 13 numbers:

int	line ID
int	string ID (see chainpix output format)
float	start point column
float	start point row
float	end point column
float	end point row
float	midpoint column
float	midpoint row
float	length
float	variance in length parallel to direction of line
float	variance in length perpendicular to direction of line
float	orientation of line (0 <= theta < pi)
float	variance in orientation

A circular arc description is a single line with 20 numbers:

int	arc ID
int	string ID (see chainpix output format)
int	direction (-1 = clockwise, 1 = anticlockwise)
float	origin column
float	origin row
float	start point column
float	start point row
float	midpoint column
float	midpoint row
float	endpoint column
float	endpoint row
float	midpoint of line joining endpoints column
float	midpoint of line joining endpoints row
float	radius
float	length
float	variance of length in parallel direction
float	variance of length in perpendicular direction
float	width (distance between endpoints of arc)
float	height (distance between midpoint of line joining endpoints and midpoint of arc)
float	orientation of line joining origin to midpoint