WhiteRectangleDetector

java.lang.Object
- com.google.zxing.common.detector.WhiteRectangleDetector

```
public final class WhiteRectangleDetector
extends java.lang.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.

Constructor Summary

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

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type Method 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