Package boofcv.alg.feature.detect.edge

Class HysteresisEdgeTraceMark

java.lang.Object

boofcv.alg.feature.detect.edge.HysteresisEdgeTraceMark

public class HysteresisEdgeTraceMark
extends Object

Given the output from edge non-maximum suppression, perform hysteresis threshold along the edge and mark selected pixels in a binary image. Points are first marked in direction tangential to the edge's direction, if no matches are found then a match is searched for using an 8-connect rule. The direction image must be the 4-direction type.

Field Summary

Fields

Modifier and Type	Field	Description
static final float	MARK_TRAVERSED

Constructor Summary

Constructors

Constructor	Description
HysteresisEdgeTraceMark()

Method Summary

Modifier and Type	Method	Description
void	process(GrayF32 intensity, GrayS8 direction, float lower, float upper, GrayU8 output)	Performs hysteresis thresholding using the provided lower and upper thresholds.
protected void	trace(int x, int y, int indexInten)	Traces along object's contour starting at the specified seed.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

MARK_TRAVERSED

public static final float MARK_TRAVERSED

See Also:

• Constant Field Values

Constructor Details

HysteresisEdgeTraceMark

public HysteresisEdgeTraceMark()

Method Details

process

public void process(GrayF32 intensity,
 GrayS8 direction,
 float lower,
 float upper,
 GrayU8 output)

Performs hysteresis thresholding using the provided lower and upper thresholds.

Parameters:

intensity - Intensity image after edge non-maximum suppression has been applied. Modified.

direction - 4-direction image. Not modified.

lower - Lower threshold.

upper - Upper threshold.

output - Output binary image. Modified.

trace

protected void trace(int x,
 int y,
 int indexInten)

Traces along object's contour starting at the specified seed. As it does so it will set the intensity of points which are below the lower threshold to zero and add points to contour.