com.google.zxing.common.detector

Class WhiteRectangleDetector

java.lang.Object

com.google.zxing.common.detector.WhiteRectangleDetector

public final class WhiteRectangleDetector
extends Object

Detects a candidate barcode-like rectangular region within an image. It starts around the center of the image, increases the size of the candidate region until it finds a white rectangular region. By keeping track of the last black points it encountered, it determines the corners of the barcode.

Author:

David Olivier

Constructor Summary

Constructors

Constructor and Description
WhiteRectangleDetector(BitMatrix image)
WhiteRectangleDetector(BitMatrix image, int initSize, int x, int y)

Method Summary

Modifier and Type	Method and Description
ResultPoint[]	detect() Detects a candidate barcode-like rectangular region within an image.

Methods inherited from class java.lang.Object

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

Constructor Detail

WhiteRectangleDetector

public WhiteRectangleDetector(BitMatrix image)
                       throws NotFoundException

Throws:

NotFoundException

WhiteRectangleDetector

public WhiteRectangleDetector(BitMatrix image,
                              int initSize,
                              int x,
                              int y)
                       throws NotFoundException

Parameters:

image - barcode image to find a rectangle in

initSize - initial size of search area around center

x - x position of search center

y - y position of search center

Throws:

NotFoundException - if image is too small to accommodate initSize

Method Detail

detect

public ResultPoint[] detect()
                     throws NotFoundException

Detects a candidate barcode-like rectangular region within an image. It starts around the center of the image, increases the size of the candidate region until it finds a white rectangular region.

Returns:

ResultPoint[] describing the corners of the rectangular region. The first and last points are opposed on the diagonal, as are the second and third. The first point will be the topmost point and the last, the bottommost. The second point will be leftmost and the third, the rightmost

Throws:

NotFoundException - if no Data Matrix Code can be found