net.sf.jaer.eventprocessing.tracking
Interface LineDetector

All Known Implementing Classes:

HoughLineTracker, MultiLineClusterTracker

public interface LineDetector

EventFilters implement this interface when they detect a line in scene. The line is characterized by the normal form (rho,theta) where theta is the angle of the line and rho is the closest distance of the line from the origin. These coordinates are illustrated below. Note that rho can be positive or negative but theta is bound to (0,180). Theta is cut at 0 and 180 degrees and 0 and 180 degrees can both represent the same line with negated rho. Note also that theta is the angle of the normal to the line, not the angle of the line itself.

Author:

tobi

Method Summary

float	getRhoPixelsFiltered() returns the filtered Hough line radius estimate - the closest distance from the middle of the chip image.
float	getThetaDegFiltered() returns the filtered angle of the normal to the line.

Method Detail

getRhoPixelsFiltered

float getRhoPixelsFiltered()

returns the filtered Hough line radius estimate - the closest distance from the middle of the chip image.

Returns:

the distance in pixels. If the chip size is sx by sy, can range over +-Math.sqrt( (sx/2)^2 + (sy/2)^2). This number is positive if the line is above the origin (center of chip).

getThetaDegFiltered

float getThetaDegFiltered()

returns the filtered angle of the normal to the line. Ranges from 0 to 180 degrees, where 0 and 180 represent a vertical line and 90 is a horizontal line. Rho can be negative and 0 and 180 can represent the same line.

Returns:

angle in degrees.