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 * Image processing operations for SciJava Ops.
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package org.scijava.ops.image.features.haralick;

import org.scijava.ops.image.image.cooccurrenceMatrix.MatrixOrientation;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.type.numeric.RealType;
import net.imglib2.type.numeric.real.DoubleType;

/**
 * Implementation of Angular Second Moment Haralick Feature
 *
 * @author Andreas Graumann (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 * @implNote op names='features.haralick.asm'
 */
public class DefaultASM<T extends RealType<T>> extends
	AbstractHaralickFeature<T>
{

	/**
	 * TODO
	 *
	 * @param input
	 * @param numGreyLevels
	 * @param distance
	 * @param orientation
	 * @return the output
	 */
	@Override
	public DoubleType apply(final RandomAccessibleInterval<T> input,
		final Integer numGreyLevels, final Integer distance,
		final MatrixOrientation orientation)
	{
		final var matrix = getCooccurrenceMatrix(input, numGreyLevels,
			distance, orientation);
		final var nrGrayLevels = matrix.length;

		double res = 0;
		for (var i = 0; i < nrGrayLevels; i++) {
			for (var j = 0; j < nrGrayLevels; j++) {
				res += matrix[i][j] * matrix[i][j];
			}
		}

        var output = new DoubleType();
		output.setReal(res);
		return output;
	}

}
