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 * Fluorescence lifetime analysis in SciJava Ops.
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package org.scijava.ops.flim;

import net.imglib2.img.Img;
import net.imglib2.type.numeric.real.FloatType;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import org.scijava.types.Nil;

public class MeanLifetimesTest extends AbstractFlimTest {

	@Test
	public void testCalcTauMean() {
		int i = 0;
		final Img<FloatType> tauM = ops.op("flim.tauMean") //
			.input(rslt) //
			.outType(new Nil<Img<FloatType>>()
			{}) //
			.apply();
		for (final FloatType pix : tauM) {
			int nComp = (int) (DIM[2] - 1) / 2;
			float[] AjTauj = new float[nComp];
			float sumAjTauj = 0;

			for (int j = 0; j < nComp; j++) {
				final float Aj = getVal(i, j * 2 + 1);
				final float tauj = getVal(i, j * 2 + 2);
				AjTauj[j] = Aj * tauj;
				sumAjTauj += AjTauj[j];
			}
			float exp = 0;
			for (int j = 0; j < nComp; j++) {
				final float tauj = getVal(i, j * 2 + 2);
				exp += tauj * AjTauj[j] / sumAjTauj;
			}

			Assertions.assertEquals(exp, pix.get(), TOLERANCE);
			i++;
		}
	}

}
