How to use

relabel

method

in

boofcv.alg.filter.binary.BinaryImageOps

/**
* Set the value of any blob which does not touches the top or bottom image border to zero.  Then
* relabel the binary image.
*/
private int filterBlobsNotTouchingEdges(ImageSInt32 labeled, int numLabels)
{
 int value[] = new int[numLabels + 1];
 for (int i = 0; i < value.length; i++)
 {
   value[i] = 0;
 }
 for (int x = 0; x < labeled.width; x++)
 {
   int top = labeled.startIndex + x;
   int bottom = labeled.startIndex + labeled.stride * (labeled.height - 1) + x;
   value[labeled.data[top]] = labeled.data[top];
   value[labeled.data[bottom]] = labeled.data[bottom];
 }
 int count = 1;
 for (int i = 0; i < value.length; i++)
 {
   if (value[i] != 0)
   {
    value[i] = count++;
   }
 }
 // relabel the image to remove blobs with holes inside
 BinaryImageOps.relabel(labeled, value);
 return count - 1;
}

/**
 * Merges regions together and updates the provided data structures for said changes.
 *
 * @param pixelToRegion (Input/Output) Image used to convert pixel location in region ID.  Modified.
 * @param regionMemberCount (Input/Output) List containing how many pixels belong to each region.  Modified.
 */
public void performMerge( GrayS32 pixelToRegion ,
             GrowQueue_I32 regionMemberCount ) {
  // update member counts
  flowIntoRootNode(regionMemberCount);
  // re-assign the number of the root node and trim excessive nodes from the lists
  setToRootNodeNewID(regionMemberCount);
  // change the labels in the pixelToRegion image
  BinaryImageOps.relabel(pixelToRegion, mergeList.data);
}