Class MeanDifference


  • public class MeanDifference
    extends Operation
    This operation determines the mean difference between two images. It requires two images of the same resolution and adds the absolute difference of all samples. Then it divides by the number of samples in the image (width times height times number of channels).

    Supported combinations of image types

    Usage example

    Double meanDifference = MeanDifference.compute(image1, image2);
    Since:
    0.11.0
    Author:
    Marco Schmidt
    • Constructor Detail

      • MeanDifference

        public MeanDifference()
    • Method Detail

      • compute

        public static Double compute​(PixelImage image1,
                                     PixelImage image2)
        Compute the mean difference between two images.
        Parameters:
        image1 - first image to be examined
        image2 - second image to be examined
        Returns:
        sum of all differences divided by number of pixels as Double or null on failure (image types are incompatible)
        Since:
        0.15.0
      • computeDiff

        private static int computeDiff​(int a,
                                       int b)
        Returns abs(a - b).
        Parameters:
        a - first number
        b - second number
        Returns:
        abs(a - b)
      • getDifference

        public double getDifference()
        After a call to process, returns the determined mean difference value.
        Returns:
        difference value, 0.0 or larger
      • setDifference

        private void setDifference​(double newValue)
      • setImages

        public void setImages​(PixelImage firstImage,
                              PixelImage secondImage)
        Sets the two images for which the mean difference is to be determined.
        Parameters:
        firstImage - first image
        secondImage - second image
        Throws:
        IllegalArgumentException - if either of the images is null, if their resolution is different or if their types are not supported by this operation