WhiteRectangleDetector (ZXing 3.4.0 API)

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

    All Methods Instance Methods Concrete Methods
    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

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