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 * Image processing operations for SciJava Ops.
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package org.scijava.ops.image.filter.gauss;

import net.imglib2.Cursor;
import net.imglib2.algorithm.gauss3.Gauss3;
import net.imglib2.exception.IncompatibleTypeException;
import net.imglib2.img.Img;
import net.imglib2.type.numeric.integer.ByteType;
import net.imglib2.util.Util;
import net.imglib2.view.Views;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.scijava.ops.image.AbstractOpTest;
import org.scijava.ops.image.util.TestImgGeneration;
import org.scijava.types.Nil;

/**
 * Tests Gaussian convolution.
 *
 * @author Martin Horn (University of Konstanz)
 * @author Christian Dietz (University of Konstanz)
 */
public class GaussTest extends AbstractOpTest {

	@Test
	public void testGauss() {
		final Img<ByteType> in = TestImgGeneration.byteArray(true, new long[] { 10,
			10 });
		final Img<ByteType> out1 = ops.op("create.img").input(in, Util
			.getTypeFromInterval(in)).outType(new Nil<Img<ByteType>>()
		{}).apply();
		final double sigma = 5;
		final Img<ByteType> out2 = ops.op("create.img").input(in, Util
			.getTypeFromInterval(in)).outType(new Nil<Img<ByteType>>()
		{}).apply();

		ops.op("filter.gauss").input(in, sigma).output(out1).compute();
		try {
			Gauss3.gauss(sigma, Views.extendMirrorSingle(in), out2);
		}
		catch (IncompatibleTypeException e) {
			throw new RuntimeException(e);
		}

		// compare outputs
		final Cursor<ByteType> c1 = out1.cursor();
		final Cursor<ByteType> c2 = out2.cursor();

		while (c1.hasNext()) {
			Assertions.assertEquals(c1.next().getRealDouble(), c2.next()
				.getRealDouble(), 0);
		}
	}
}
