Class MedianFilter


  • public class MedianFilter
    extends AreaFilterOperation
    Applies a Median filter that replaces each pixel by the median of itself and its neighbors. The number of neighbors can be defined with the setArea methods.

    Can be used as despeckle filter, but the image will lose sharpness. The larger the area becomes, the less noise and the less sharpness will remain, and the longer it will take.

    Uses Median to do the search for the median value.

    Usage example

     PixelImage image = ...; // some GrayIntegerImage or RGBIntegerImage
     MedianFilter filter = new MedianFilter();
     filter.setArea(5, 5);
     filter.setInputImage(image);
     filter.process();
     PixelImage filteredImage = filter.getOutputImage();
     
    Author:
    Marco Schmidt
    • Constructor Detail

      • MedianFilter

        public MedianFilter()
    • Method Detail

      • computeSample

        public final int computeSample​(int[] samples,
                                       int numSamples)
        Description copied from class: AreaFilterOperation
        Determine the resulting sample for an array with the source sample and zero or more of its neighbors. This abstract method must be implemented by classes extending this operation. The array will hold numSamples samples, which will be stored starting at offset 0.

        Normally, numSamples is equal to AreaFilterOperation.getAreaWidth() times AreaFilterOperation.getAreaHeight(). Near the border of the image you may get less samples. Example: the top left sample of an image has only three neighbors (east, south-east and south), so you will only get four samples (three neighbors and the sample itself).

        Specified by:
        computeSample in class AreaFilterOperation
        Parameters:
        samples - the array holding the sample(s)
        numSamples - number of samples in the array
        Returns:
        sample to be written to the output image