Examples of net.sourceforge.jiu.color.analysis.Histogram1DCreator

net.sourceforge.jiu.color.analysis.Histogram1DCreator

This class creates one-dimensional histograms for images with integer samples. Only {@link net.sourceforge.jiu.data.IntegerImage} objects are supported.

Existing histogram objects can be given to this operation to be reused. Give an existing {@link net.sourceforge.jiu.color.data.Histogram1D} object to this operation via {@link #setHistogram(Histogram1D)}.

The histogram can be created for any channel of an IntegerImage. The first channel (index 0) is the default channel. Use {@link #setImage(IntegerImage,int)} to specify another one.

Note: Before JIU 0.10.0 there was a single HistogramCreator class.

Usage example

Creates a histogram for the third channel of an image, whose index is two because channels are zero-based:

 Histogram1DCreator hc = new Histogram1DCreator(); hc.setImage(image, 2); hc.process(); Histogram1D hist = hc.getHistogram();

If you just want to learn the number of different samples in an image, there's a static convenience method count for that. Again, we use the third channel:

Integer numUsedSamples = Histogram1DCreator.count(image, 2);

@author Marco Schmidt @since 0.10.0


  private void initTables(IntegerImage in) throws OperationFailedException
  {
    for (int channelIndex = 0; channelIndex < in.getNumChannels(); channelIndex++)
    {
      Histogram1DCreator hc = new Histogram1DCreator();
      hc.setImage(in, channelIndex);
      hc.process();
      Histogram1D hist = hc.getHistogram();


      int min = 0;
      while (hist.getEntry(min) == 0)
      {
        min++;


  private void initTables(IntegerImage in) throws OperationFailedException
  {
    for (int channelIndex = 0; channelIndex < in.getNumChannels(); channelIndex++)
    {
      Histogram1DCreator hc = new Histogram1DCreator();
      hc.setImage(in, channelIndex);
      hc.process();
      Histogram1D hist = hc.getHistogram();


      final int MAX_SAMPLE = in.getMaxSample(channelIndex);
      int[] data = new int[MAX_SAMPLE + 1];
      int NUM_PIXELS = in.getWidth() * in.getHeight();
      long sum = 0;

Examples of net.sourceforge.jiu.color.analysis.Histogram1DCreator

Usage example

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