Package boofcv.alg.fiducial.calib.chess

Class ChessboardPolygonHelper<T extends ImageGray<T>>

java.lang.Object

boofcv.alg.fiducial.calib.chess.ChessboardPolygonHelper<T>

All Implemented Interfaces:

PolygonHelper

public class ChessboardPolygonHelper<T extends ImageGray<T>>
extends Object
implements PolygonHelper

Helper which expands polygons prior to optimization. This is done to counter act the erosion step which shrunk the polygon

Constructor Summary

Constructors

Constructor	Description
ChessboardPolygonHelper()

Method Summary

Modifier and Type	Method	Description
void	configureBeforePolyline(PointsToPolyline contourToPolyline, boolean touchesBorder)	Provide an oportunity to configure the polyline fit based on what's currently known
boolean	filterContour(List<Point2D_I32> contour, boolean touchesBorder, boolean distorted)	User defined filter to accept/reject or modify the contour of a shape.
boolean	filterPixelPolygon(Polygon2D_F64 undistorted, Polygon2D_F64 distorted, DogArray_B touches, boolean touchesBorder)	If not touching the border then the number of corners must be 4.
void	setImageShape(int width, int height)	Specifies width and height of the image being processed

Methods inherited from class java.lang.Object

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

Constructor Details

ChessboardPolygonHelper

public ChessboardPolygonHelper()

Method Details

setImageShape

public void setImageShape(int width,
 int height)

Description copied from interface: PolygonHelper

Specifies width and height of the image being processed

Specified by:

setImageShape in interface PolygonHelper

Parameters:

width - Image width in pixels

height - Image height in pixels

filterContour

public boolean filterContour(List<Point2D_I32> contour,
 boolean touchesBorder,
 boolean distorted)

Description copied from interface: PolygonHelper

User defined filter to accept/reject or modify the contour of a shape. Called at most twice. First with distorted pixels and after distortion has been removed.

Specified by:

filterContour in interface PolygonHelper

Parameters:

contour - External contour around a shape. Can be modified

touchesBorder - true if the contour touches the image border or false if it doesnt

distorted - True if pixels are distorted or false for undistorted pixel coordinates

Returns:

true to keep the contour for further processing or false to reject it

filterPixelPolygon

public boolean filterPixelPolygon(Polygon2D_F64 undistorted,
 Polygon2D_F64 distorted,
 DogArray_B touches,
 boolean touchesBorder)

If not touching the border then the number of corners must be 4. If touching the border there must be at least 3 corners not touching the border. 7 corners at most. If there were 8 then all sides of a square would be touching the border. No more than 3 corners since that's the most number of non-border corners a square can have.

Specified by:

filterPixelPolygon in interface PolygonHelper

Parameters:

undistorted - Polygon in undistorted image pixels.

distorted - Polygon in distorted/original image pixels.

touches - Array of booleans indicating which corners touch the image border. Only valid if part of it touches

touchesBorder - true if the contour touches the image border or false if it doesnt

Returns:

true to keep the contour for further processing or false to reject it

configureBeforePolyline

public void configureBeforePolyline(PointsToPolyline contourToPolyline,
 boolean touchesBorder)

Description copied from interface: PolygonHelper

Provide an oportunity to configure the polyline fit based on what's currently known

Specified by:

configureBeforePolyline in interface PolygonHelper