com.google.zxing.common
Class DefaultGridSampler

java.lang.Object
  extended by com.google.zxing.common.GridSampler
      extended by com.google.zxing.common.DefaultGridSampler

public final class DefaultGridSampler
extends GridSampler

Since:
BlackBerry API 6.0.0

Constructor Summary
DefaultGridSampler()
           
 
Method Summary
 BitMatrix sampleGrid(BitMatrix image, int dimension, float p1ToX, float p1ToY, float p2ToX, float p2ToY, float p3ToX, float p3ToY, float p4ToX, float p4ToY, float p1FromX, float p1FromY, float p2FromX, float p2FromY, float p3FromX, float p3FromY, float p4FromX, float p4FromY)
          Samples an image for a square matrix of bits of the given dimension.
 
Methods inherited from class com.google.zxing.common.GridSampler
checkAndNudgePoints, getInstance, setGridSampler
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 



Constructor Detail

DefaultGridSampler

public DefaultGridSampler()
Since:
BlackBerry API 6.0.0


Method Detail

sampleGrid

public BitMatrix sampleGrid(BitMatrix image,
                            int dimension,
                            float p1ToX,
                            float p1ToY,
                            float p2ToX,
                            float p2ToY,
                            float p3ToX,
                            float p3ToY,
                            float p4ToX,
                            float p4ToY,
                            float p1FromX,
                            float p1FromY,
                            float p2FromX,
                            float p2FromY,
                            float p3FromX,
                            float p3FromY,
                            float p4FromX,
                            float p4FromY)
                     throws ReaderException
Description copied from class: GridSampler

Samples an image for a square matrix of bits of the given dimension. This is used to extract the black/white modules of a 2D barcode like a QR Code found in an image. Because this barcode may be rotated or perspective-distorted, the caller supplies four points in the source image that define known points in the barcode, so that the image may be sampled appropriately.

The last eight "from" parameters are four X/Y coordinate pairs of locations of points in the image that define some significant points in the image to be sample. For example, these may be the location of finder pattern in a QR Code.

The first eight "to" parameters are four X/Y coordinate pairs measured in the destination BitMatrix, from the top left, where the known points in the image given by the "from" parameters map to.

These 16 parameters define the transformation needed to sample the image.

Specified by:
sampleGrid in class GridSampler
Parameters:
image - image to sample
dimension - width/height of BitMatrix to sample from image
Returns:
BitMatrix representing a grid of points sampled from the image within a region defined by the "from" parameters
Throws:
ReaderException - if image can't be sampled, for example, if the transformation defined by the given points is invalid or results in sampling outside the image boundaries
Since:
BlackBerry API 6.0.0





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