com.google.zxing.common
Class PerspectiveTransform

java.lang.Object
  com.google.zxing.common.PerspectiveTransform

public final class PerspectiveTransform
extends Object

This class implements a perspective transform in two dimensions. Given four source and four destination points, it will compute the transformation implied between them. The code is based directly upon section 3.4.2 of George Wolberg's "Digital Image Warping"; see pages 54-56.

Author:

Sean Owen

Method Summary

static PerspectiveTransform	quadrilateralToQuadrilateral(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float x0p, float y0p, float x1p, float y1p, float x2p, float y2p, float x3p, float y3p)
static PerspectiveTransform	quadrilateralToSquare(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)
static PerspectiveTransform	squareToQuadrilateral(float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3)
void	transformPoints(float[] points)
void	transformPoints(float[] xValues, float[] yValues) Convenience method, not optimized for performance.

Methods inherited from class java.lang.Object

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

Method Detail

quadrilateralToQuadrilateral

public static PerspectiveTransform quadrilateralToQuadrilateral(float x0,
                                                                float y0,
                                                                float x1,
                                                                float y1,
                                                                float x2,
                                                                float y2,
                                                                float x3,
                                                                float y3,
                                                                float x0p,
                                                                float y0p,
                                                                float x1p,
                                                                float y1p,
                                                                float x2p,
                                                                float y2p,
                                                                float x3p,
                                                                float y3p)

transformPoints

public void transformPoints(float[] points)

transformPoints

public void transformPoints(float[] xValues,
                            float[] yValues)

Convenience method, not optimized for performance.

squareToQuadrilateral

public static PerspectiveTransform squareToQuadrilateral(float x0,
                                                         float y0,
                                                         float x1,
                                                         float y1,
                                                         float x2,
                                                         float y2,
                                                         float x3,
                                                         float y3)

quadrilateralToSquare

public static PerspectiveTransform quadrilateralToSquare(float x0,
                                                         float y0,
                                                         float x1,
                                                         float y1,
                                                         float x2,
                                                         float y2,
                                                         float x3,
                                                         float y3)