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 Details

    • 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 Details

    • 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