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

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;
import org.scijava.types.Nil;

import org.scijava.ops.image.AbstractOpTest;
import net.imglib2.RandomAccess;
import net.imglib2.RandomAccessibleInterval;
import net.imglib2.img.Img;
import net.imglib2.type.numeric.real.FloatType;

/**
 * The HoG Op is tested by comparing its result with the ground-truth which was
 * created on a certain test image. So this test runs only with this certain
 * test image. The correctness of the ground-truth has been verified by hand.
 *
 * @author Simon Schmid (University of Konstanz)
 */
public class HistogramOfOrientedGradients2DTest extends AbstractOpTest {

	private static final double EPSILON = 0.00001;

	@Test
	public void test() {
		Img<FloatType> hogTestImg = openFloatImg("HoG2DResult.tif");
		Img<FloatType> hogInputImg = openFloatImg("HoG2DInput.png");

		// use numOrientations = 9 and spanOfNeighborhood = 2 for test
		RandomAccessibleInterval<FloatType> hogOp = ops.op("features.hog").input(
			hogInputImg, 9, 2).outType(new Nil<RandomAccessibleInterval<FloatType>>()
		{}).apply();

		RandomAccess<FloatType> raOp = hogOp.randomAccess();
		RandomAccess<FloatType> raTest = hogTestImg.randomAccess();

		// check dimensions
		assertEquals(hogTestImg.numDimensions(), hogOp.numDimensions());
		assertEquals(hogTestImg.dimension(0), hogOp.dimension(0));
		assertEquals(hogTestImg.dimension(1), hogOp.dimension(1));
		assertEquals(hogTestImg.dimension(2), hogOp.dimension(2));

		// check pixel values
		for (int i = 0; i < hogTestImg.dimension(0); i++) {
			for (int j = 0; j < hogTestImg.dimension(1); j++) {
				for (int k = 0; k < hogTestImg.dimension(2); k++) {
					raTest.setPosition(new long[] { i, j, k });
					raOp.setPosition(new long[] { i, j, k });
					assertEquals(raTest.get().getRealFloat(), raOp.get().getRealFloat(),
						EPSILON, "i=" + i + ", j=" + j + ", k=" + k);
				}
			}
		}
	}
}
