Package com.google.zxing.datamatrix.detector

Class Detector

java.lang.Object

com.google.zxing.datamatrix.detector.Detector

public final class Detector
extends java.lang.Object

Encapsulates logic that can detect a Data Matrix Code in an image, even if the Data Matrix Code is rotated or skewed, or partially obscured.

Field Summary

Fields

Modifier and Type	Field	Description
private BitMatrix	image
private WhiteRectangleDetector	rectangleDetector

Constructor Summary

Constructors

Constructor	Description
Detector(BitMatrix image)

Method Summary

Modifier and Type	Method	Description
private ResultPoint	correctTopRight(ResultPoint[] points)	Calculates the corner position of the white top right module.
DetectorResult	detect()	Detects a Data Matrix Code in an image.
private ResultPoint[]	detectSolid1(ResultPoint[] cornerPoints)	Detect a solid side which has minimum transition.
private ResultPoint[]	detectSolid2(ResultPoint[] points)	Detect a second solid side next to first solid side.
private boolean	isValid(ResultPoint p)
private static ResultPoint	moveAway(ResultPoint point, float fromX, float fromY)
private static BitMatrix	sampleGrid(BitMatrix image, ResultPoint topLeft, ResultPoint bottomLeft, ResultPoint bottomRight, ResultPoint topRight, int dimensionX, int dimensionY)
private static ResultPoint	shiftPoint(ResultPoint point, ResultPoint to, int div)
private ResultPoint[]	shiftToModuleCenter(ResultPoint[] points)	Shift the edge points to the module center.
private int	transitionsBetween(ResultPoint from, ResultPoint to)	Counts the number of black/white transitions between two points, using something like Bresenham's algorithm.

Methods inherited from class java.lang.Object

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

Field Detail

image

private final BitMatrix image

rectangleDetector

private final WhiteRectangleDetector rectangleDetector

Constructor Detail

Detector

public Detector(BitMatrix image)
         throws NotFoundException

Throws:

NotFoundException

Method Detail

detect

public DetectorResult detect()
                      throws NotFoundException

Detects a Data Matrix Code in an image.

Returns:

DetectorResult encapsulating results of detecting a Data Matrix Code

Throws:

NotFoundException - if no Data Matrix Code can be found

shiftPoint

private static ResultPoint shiftPoint(ResultPoint point,
                                      ResultPoint to,
                                      int div)

moveAway

private static ResultPoint moveAway(ResultPoint point,
                                    float fromX,
                                    float fromY)

detectSolid1

private ResultPoint[] detectSolid1(ResultPoint[] cornerPoints)

Detect a solid side which has minimum transition.

detectSolid2

private ResultPoint[] detectSolid2(ResultPoint[] points)

Detect a second solid side next to first solid side.

correctTopRight

private ResultPoint correctTopRight(ResultPoint[] points)

Calculates the corner position of the white top right module.

shiftToModuleCenter

private ResultPoint[] shiftToModuleCenter(ResultPoint[] points)

Shift the edge points to the module center.

isValid

private boolean isValid(ResultPoint p)

sampleGrid

private static BitMatrix sampleGrid(BitMatrix image,
                                    ResultPoint topLeft,
                                    ResultPoint bottomLeft,
                                    ResultPoint bottomRight,
                                    ResultPoint topRight,
                                    int dimensionX,
                                    int dimensionY)
                             throws NotFoundException

Throws:

NotFoundException

transitionsBetween

private int transitionsBetween(ResultPoint from,
                               ResultPoint to)

Counts the number of black/white transitions between two points, using something like Bresenham's algorithm.