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//                           License Agreement
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// //////////////////////////////////////////////////////////////////////////////////////
// Author: Sajjad Taheri, University of California, Irvine. sajjadt[at]uci[dot]edu
//
//                             LICENSE AGREEMENT
// Copyright (c) 2015 The Regents of the University of California (Regents)
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. Neither the name of the University nor the
//    names of its contributors may be used to endorse or promote products
//    derived from this software without specific prior written permission.
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//

if (typeof module !== 'undefined' && module.exports) {
    // The envrionment is Node.js
    var cv = require('./opencv.js'); // eslint-disable-line no-var
}

QUnit.module('Image Processing', {});

QUnit.test('test_imgProc', function(assert) {
    // calcHist
    {
        let vec1 = new cv.Mat.ones(new cv.Size(20, 20), cv.CV_8UC1); // eslint-disable-line new-cap
        let source = new cv.MatVector();
        source.push_back(vec1);
        let channels = [0];
        let histSize = [256];
        let ranges =[0, 256];

        let hist = new cv.Mat();
        let mask = new cv.Mat();
        let binSize = cv._malloc(4);
        let binView = new Int32Array(cv.HEAP8.buffer, binSize);
        binView[0] = 10;
        cv.calcHist(source, channels, mask, hist, histSize, ranges, false);

        // hist should contains a N X 1 arrary.
        let size = hist.size();
        assert.equal(size.height, 256);
        assert.equal(size.width, 1);

        // default parameters
        cv.calcHist(source, channels, mask, hist, histSize, ranges);
        size = hist.size();
        assert.equal(size.height, 256);
        assert.equal(size.width, 1);

        // Do we need to verify data in histogram?
        // let dataView = hist.data;

        // Free resource
        cv._free(binSize);
        mask.delete();
        hist.delete();
    }

    // cvtColor
    {
        let source = new cv.Mat(10, 10, cv.CV_8UC3);
        let dest = new cv.Mat();

        cv.cvtColor(source, dest, cv.COLOR_BGR2GRAY, 0);
        assert.equal(dest.channels(), 1);

        cv.cvtColor(source, dest, cv.COLOR_BGR2GRAY);
        assert.equal(dest.channels(), 1);

        cv.cvtColor(source, dest, cv.COLOR_BGR2BGRA, 0);
        assert.equal(dest.channels(), 4);

        cv.cvtColor(source, dest, cv.COLOR_BGR2BGRA);
        assert.equal(dest.channels(), 4);

        dest.delete();
        source.delete();
    }
    // equalizeHist
    {
        let source = new cv.Mat(10, 10, cv.CV_8UC1);
        let dest = new cv.Mat();

        cv.equalizeHist(source, dest);

        // eualizeHist changes the content of a image, but does not alter meta data
        // of it.
        assert.equal(source.channels(), dest.channels());
        assert.equal(source.type(), dest.type());

        dest.delete();
        source.delete();
    }
});

QUnit.test('test_segmentation', function(assert) {
    const THRESHOLD = 127.0;
    const THRESHOLD_MAX = 210.0;

    // threshold
    {
        let source = new cv.Mat(1, 5, cv.CV_8UC1);
        let sourceView = source.data;
        sourceView[0] = 0; // < threshold
        sourceView[1] = 100; // < threshold
        sourceView[2] = 200; // > threshold

        let dest = new cv.Mat();

        cv.threshold(source, dest, THRESHOLD, THRESHOLD_MAX, cv.THRESH_BINARY);

        let destView = dest.data;
        assert.equal(destView[0], 0);
        assert.equal(destView[1], 0);
        assert.equal(destView[2], THRESHOLD_MAX);
    }

    // adaptiveThreshold
    {
        let source = cv.Mat.zeros(1, 5, cv.CV_8UC1);
        let sourceView = source.data;
        sourceView[0] = 50;
        sourceView[1] = 150;
        sourceView[2] = 200;

        let dest = new cv.Mat();
        const C = 0;
        const blockSize = 3;
        cv.adaptiveThreshold(source, dest, THRESHOLD_MAX,
                             cv.ADAPTIVE_THRESH_MEAN_C, cv.THRESH_BINARY, blockSize, C);

        let destView = dest.data;
        assert.equal(destView[0], 0);
        assert.equal(destView[1], THRESHOLD_MAX);
        assert.equal(destView[2], THRESHOLD_MAX);
    }
});

QUnit.test('test_shape', function(assert) {
    // moments
    {
        let points = new cv.Mat(1, 4, cv.CV_32SC2);
        let data32S = points.data32S;
        data32S[0]=50;
        data32S[1]=56;
        data32S[2]=53;
        data32S[3]=53;
        data32S[4]=46;
        data32S[5]=54;
        data32S[6]=49;
        data32S[7]=51;

        let m = cv.moments(points, false);
        let area = cv.contourArea(points, false);

        assert.equal(m.m00, 0);
        assert.equal(m.m01, 0);
        assert.equal(m.m10, 0);
        assert.equal(area, 0);

        // default parameters
        m = cv.moments(points);
        area = cv.contourArea(points);
        assert.equal(m.m00, 0);
        assert.equal(m.m01, 0);
        assert.equal(m.m10, 0);
        assert.equal(area, 0);

        points.delete();
    }
});

QUnit.test('test_min_enclosing', function(assert) {
    {
        let points = new cv.Mat(4, 1, cv.CV_32FC2);

        points.data32F[0] = 0;
        points.data32F[1] = 0;
        points.data32F[2] = 1;
        points.data32F[3] = 0;
        points.data32F[4] = 1;
        points.data32F[5] = 1;
        points.data32F[6] = 0;
        points.data32F[7] = 1;

        let circle = cv.minEnclosingCircle(points);

        assert.deepEqual(circle.center, {x: 0.5, y: 0.5});
        assert.ok(Math.abs(circle.radius - Math.sqrt(2) / 2) < 0.001);

        points.delete();
    }
});

QUnit.test('test_filter', function(assert) {
    // blur
    {
        let mat1 = cv.Mat.ones(5, 5, cv.CV_8UC3);
        let mat2 = new cv.Mat();

        cv.blur(mat1, mat2, {height: 3, width: 3}, {x: -1, y: -1}, cv.BORDER_DEFAULT);

        // Verify result.
        let size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 5);
        assert.equal(size.width, 5);

        cv.blur(mat1, mat2, {height: 3, width: 3}, {x: -1, y: -1});

        // Verify result.
        size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 5);
        assert.equal(size.width, 5);

        cv.blur(mat1, mat2, {height: 3, width: 3});

        // Verify result.
        size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 5);
        assert.equal(size.width, 5);

        mat1.delete();
        mat2.delete();
    }

    // GaussianBlur
    {
        let mat1 = cv.Mat.ones(7, 7, cv.CV_8UC1);
        let mat2 = new cv.Mat();

        cv.GaussianBlur(mat1, mat2, new cv.Size(3, 3), 0, 0, // eslint-disable-line new-cap
                        cv.BORDER_DEFAULT);

        // Verify result.
        let size = mat2.size();
        assert.equal(mat2.channels(), 1);
        assert.equal(size.height, 7);
        assert.equal(size.width, 7);
    }

    // medianBlur
    {
        let mat1 = cv.Mat.ones(9, 9, cv.CV_8UC3);
        let mat2 = new cv.Mat();

        cv.medianBlur(mat1, mat2, 3);

        // Verify result.
        let size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 9);
        assert.equal(size.width, 9);
    }

    // Transpose
    {
        let mat1 = cv.Mat.eye(9, 9, cv.CV_8UC3);
        let mat2 = new cv.Mat();

        cv.transpose(mat1, mat2);

        // Verify result.
        let size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 9);
        assert.equal(size.width, 9);
    }

    // bilateralFilter
    {
        let mat1 = cv.Mat.ones(11, 11, cv.CV_8UC3);
        let mat2 = new cv.Mat();

        cv.bilateralFilter(mat1, mat2, 3, 6, 1.5, cv.BORDER_DEFAULT);

        // Verify result.
        let size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 11);
        assert.equal(size.width, 11);

        // default parameters
        cv.bilateralFilter(mat1, mat2, 3, 6, 1.5);
        // Verify result.
        size = mat2.size();
        assert.equal(mat2.channels(), 3);
        assert.equal(size.height, 11);
        assert.equal(size.width, 11);

        mat1.delete();
        mat2.delete();
    }

    // Watershed
    {
        let mat = cv.Mat.ones(11, 11, cv.CV_8UC3);
        let out = new cv.Mat(11, 11, cv.CV_32SC1);

        cv.watershed(mat, out);

        // Verify result.
        let size = out.size();
        assert.equal(out.channels(), 1);
        assert.equal(size.height, 11);
        assert.equal(size.width, 11);
        assert.equal(out.elemSize1(), 4);

        mat.delete();
        out.delete();
    }

    // Concat
    {
        let mat = cv.Mat.ones({height: 10, width: 5}, cv.CV_8UC3);
        let mat2 = cv.Mat.eye({height: 10, width: 5}, cv.CV_8UC3);
        let mat3 = cv.Mat.eye({height: 10, width: 5}, cv.CV_8UC3);


        let out = new cv.Mat();
        let input = new cv.MatVector();
        input.push_back(mat);
        input.push_back(mat2);
        input.push_back(mat3);

        cv.vconcat(input, out);

        // Verify result.
        let size = out.size();
        assert.equal(out.channels(), 3);
        assert.equal(size.height, 30);
        assert.equal(size.width, 5);
        assert.equal(out.elemSize1(), 1);

        cv.hconcat(input, out);

        // Verify result.
        size = out.size();
        assert.equal(out.channels(), 3);
        assert.equal(size.height, 10);
        assert.equal(size.width, 15);
        assert.equal(out.elemSize1(), 1);

        input.delete();
        out.delete();
    }


    // distanceTransform letiants
    {
        let mat = cv.Mat.ones(11, 11, cv.CV_8UC1);
        let out = new cv.Mat(11, 11, cv.CV_32FC1);
        let labels = new cv.Mat(11, 11, cv.CV_32FC1);
        const maskSize = 3;
        cv.distanceTransform(mat, out, cv.DIST_L2, maskSize, cv.CV_32F);

        // Verify result.
        let size = out.size();
        assert.equal(out.channels(), 1);
        assert.equal(size.height, 11);
        assert.equal(size.width, 11);
        assert.equal(out.elemSize1(), 4);


        cv.distanceTransformWithLabels(mat, out, labels, cv.DIST_L2, maskSize,
                                       cv.DIST_LABEL_CCOMP);

        // Verify result.
        size = out.size();
        assert.equal(out.channels(), 1);
        assert.equal(size.height, 11);
        assert.equal(size.width, 11);
        assert.equal(out.elemSize1(), 4);

        size = labels.size();
        assert.equal(labels.channels(), 1);
        assert.equal(size.height, 11);
        assert.equal(size.width, 11);
        assert.equal(labels.elemSize1(), 4);

        mat.delete();
        out.delete();
        labels.delete();
    }

    // Min, Max
    {
        let data1 = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9]);
        let data2 = new Uint8Array([0, 4, 0, 8, 0, 12, 0, 16, 0]);

        let expectedMin = new Uint8Array([0, 2, 0, 4, 0, 6, 0, 8, 0]);
        let expectedMax = new Uint8Array([1, 4, 3, 8, 5, 12, 7, 16, 9]);

        let dataPtr = cv._malloc(3*3*1);
        let dataPtr2 = cv._malloc(3*3*1);

        let dataHeap = new Uint8Array(cv.HEAPU8.buffer, dataPtr, 3*3*1);
        dataHeap.set(new Uint8Array(data1.buffer));

        let dataHeap2 = new Uint8Array(cv.HEAPU8.buffer, dataPtr2, 3*3*1);
        dataHeap2.set(new Uint8Array(data2.buffer));


        let mat1 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr, 0);
        let mat2 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr2, 0);

        let mat3 = new cv.Mat();

        cv.min(mat1, mat2, mat3);
        // Verify result.
        let size = mat2.size();
        assert.equal(mat2.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(mat3.data, expectedMin);


        cv.max(mat1, mat2, mat3);
        // Verify result.
        size = mat2.size();
        assert.equal(mat2.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(mat3.data, expectedMax);

        cv._free(dataPtr);
        cv._free(dataPtr2);
    }

    // Bitwise operations
    {
        let data1 = new Uint8Array([0, 1, 2, 4, 8, 16, 32, 64, 128]);
        let data2 = new Uint8Array([255, 255, 255, 255, 255, 255, 255, 255, 255]);

        let expectedAnd = new Uint8Array([0, 1, 2, 4, 8, 16, 32, 64, 128]);
        let expectedOr = new Uint8Array([255, 255, 255, 255, 255, 255, 255, 255, 255]);
        let expectedXor = new Uint8Array([255, 254, 253, 251, 247, 239, 223, 191, 127]);

        let expectedNot = new Uint8Array([255, 254, 253, 251, 247, 239, 223, 191, 127]);

        let dataPtr = cv._malloc(3*3*1);
        let dataPtr2 = cv._malloc(3*3*1);

        let dataHeap = new Uint8Array(cv.HEAPU8.buffer, dataPtr, 3*3*1);
        dataHeap.set(new Uint8Array(data1.buffer));

        let dataHeap2 = new Uint8Array(cv.HEAPU8.buffer, dataPtr2, 3*3*1);
        dataHeap2.set(new Uint8Array(data2.buffer));


        let mat1 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr, 0);
        let mat2 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr2, 0);

        let mat3 = new cv.Mat();
        let none = new cv.Mat();

        cv.bitwise_not(mat1, mat3, none);
        // Verify result.
        let size = mat3.size();
        assert.equal(mat3.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(mat3.data, expectedNot);

        cv.bitwise_and(mat1, mat2, mat3, none);
        // Verify result.
        size = mat3.size();
        assert.equal(mat3.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(mat3.data, expectedAnd);


        cv.bitwise_or(mat1, mat2, mat3, none);
        // Verify result.
        size = mat3.size();
        assert.equal(mat3.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(mat3.data, expectedOr);

        cv.bitwise_xor(mat1, mat2, mat3, none);
        // Verify result.
        size = mat3.size();
        assert.equal(mat3.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(mat3.data, expectedXor);

        cv._free(dataPtr);
        cv._free(dataPtr2);
    }

    // Arithmetic operations
    {
        let data1 = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8]);
        let data2 = new Uint8Array([0, 2, 4, 6, 8, 10, 12, 14, 16]);
        let data3 = new Uint8Array([0, 1, 0, 1, 0, 1, 0, 1, 0]);

        // |data1 - data2|
        let expectedAbsDiff = new Uint8Array([0, 1, 2, 3, 4, 5, 6, 7, 8]);
        let expectedAdd = new Uint8Array([0, 3, 6, 9, 12, 15, 18, 21, 24]);

        const alpha = 4;
        const beta = -1;
        const gamma = 3;
        // 4*data1 - data2 + 3
        let expectedWeightedAdd = new Uint8Array([3, 5, 7, 9, 11, 13, 15, 17, 19]);

        let dataPtr = cv._malloc(3*3*1);
        let dataPtr2 = cv._malloc(3*3*1);
        let dataPtr3 = cv._malloc(3*3*1);

        let dataHeap = new Uint8Array(cv.HEAPU8.buffer, dataPtr, 3*3*1);
        dataHeap.set(new Uint8Array(data1.buffer));
        let dataHeap2 = new Uint8Array(cv.HEAPU8.buffer, dataPtr2, 3*3*1);
        dataHeap2.set(new Uint8Array(data2.buffer));
        let dataHeap3 = new Uint8Array(cv.HEAPU8.buffer, dataPtr3, 3*3*1);
        dataHeap3.set(new Uint8Array(data3.buffer));

        let mat1 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr, 0);
        let mat2 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr2, 0);
        let mat3 = new cv.Mat(3, 3, cv.CV_8UC1, dataPtr3, 0);

        let dst = new cv.Mat();
        let none = new cv.Mat();

        cv.absdiff(mat1, mat2, dst);
        // Verify result.
        let size = dst.size();
        assert.equal(dst.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(dst.data, expectedAbsDiff);

        cv.add(mat1, mat2, dst, none, -1);
        // Verify result.
        size = dst.size();
        assert.equal(dst.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(dst.data, expectedAdd);

        cv.addWeighted(mat1, alpha, mat2, beta, gamma, dst, -1);
        // Verify result.
        size = dst.size();
        assert.equal(dst.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(dst.data, expectedWeightedAdd);

        // default parameter
        cv.addWeighted(mat1, alpha, mat2, beta, gamma, dst);
        // Verify result.
        size = dst.size();
        assert.equal(dst.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);

        assert.deepEqual(dst.data, expectedWeightedAdd);

        mat1.delete();
        mat2.delete();
        mat3.delete();
        dst.delete();
        none.delete();
    }

    // Integral letiants
    {
        let mat = cv.Mat.eye({height: 100, width: 100}, cv.CV_8UC3);
        let sum = new cv.Mat();
        let sqSum = new cv.Mat();
        let title = new cv.Mat();

        cv.integral(mat, sum, -1);

        // Verify result.
        let size = sum.size();
        assert.equal(sum.channels(), 3);
        assert.equal(size.height, 100+1);
        assert.equal(size.width, 100+1);

        cv.integral2(mat, sum, sqSum, -1, -1);
        // Verify result.
        size = sum.size();
        assert.equal(sum.channels(), 3);
        assert.equal(size.height, 100+1);
        assert.equal(size.width, 100+1);

        size = sqSum.size();
        assert.equal(sqSum.channels(), 3);
        assert.equal(size.height, 100+1);
        assert.equal(size.width, 100+1);

        mat.delete();
        sum.delete();
        sqSum.delete();
        title.delete();
    }

    // Mean, meanSTDev
    {
        let mat = cv.Mat.eye({height: 100, width: 100}, cv.CV_8UC3);
        let sum = new cv.Mat();
        let sqSum = new cv.Mat();
        let title = new cv.Mat();

        cv.integral(mat, sum, -1);

        // Verify result.
        let size = sum.size();
        assert.equal(sum.channels(), 3);
        assert.equal(size.height, 100+1);
        assert.equal(size.width, 100+1);

        cv.integral2(mat, sum, sqSum, -1, -1);
        // Verify result.
        size = sum.size();
        assert.equal(sum.channels(), 3);
        assert.equal(size.height, 100+1);
        assert.equal(size.width, 100+1);

        size = sqSum.size();
        assert.equal(sqSum.channels(), 3);
        assert.equal(size.height, 100+1);
        assert.equal(size.width, 100+1);

        mat.delete();
        sum.delete();
        sqSum.delete();
        title.delete();
    }

    // Invert
    {
        let inv1 = new cv.Mat();
        let inv2 = new cv.Mat();
        let inv3 = new cv.Mat();
        let inv4 = new cv.Mat();


        let data1 = new Float32Array([1, 0, 0,
                                      0, 1, 0,
                                      0, 0, 1]);
        let data2 = new Float32Array([0, 0, 0,
                                      0, 5, 0,
                                      0, 0, 0]);
        let data3 = new Float32Array([1, 1, 1, 0,
                                      0, 3, 1, 2,
                                      2, 3, 1, 0,
                                      1, 0, 2, 1]);
        let data4 = new Float32Array([1, 4, 5,
                                      4, 2, 2,
                                      5, 2, 2]);

        let expected1 = new Float32Array([1, 0, 0,
                                          0, 1, 0,
                                          0, 0, 1]);
        // Inverse does not exist!
        let expected3 = new Float32Array([-3, -1/2, 3/2, 1,
                                          1, 1/4, -1/4, -1/2,
                                          3, 1/4, -5/4, -1/2,
                                          -3, 0, 1, 1]);
        let expected4 = new Float32Array([0, -1, 1,
                                          -1, 23/2, -9,
                                          1, -9, 7]);

        let dataPtr1 = cv._malloc(3*3*4);
        let dataPtr2 = cv._malloc(3*3*4);
        let dataPtr3 = cv._malloc(4*4*4);
        let dataPtr4 = cv._malloc(3*3*4);

        let dataHeap = new Float32Array(cv.HEAP32.buffer, dataPtr1, 3*3);
        dataHeap.set(new Float32Array(data1.buffer));
        let dataHeap2 = new Float32Array(cv.HEAP32.buffer, dataPtr2, 3*3);
        dataHeap2.set(new Float32Array(data2.buffer));
        let dataHeap3 = new Float32Array(cv.HEAP32.buffer, dataPtr3, 4*4);
        dataHeap3.set(new Float32Array(data3.buffer));
        let dataHeap4 = new Float32Array(cv.HEAP32.buffer, dataPtr4, 3*3);
        dataHeap4.set(new Float32Array(data4.buffer));

        let mat1 = new cv.Mat(3, 3, cv.CV_32FC1, dataPtr1, 0);
        let mat2 = new cv.Mat(3, 3, cv.CV_32FC1, dataPtr2, 0);
        let mat3 = new cv.Mat(4, 4, cv.CV_32FC1, dataPtr3, 0);
        let mat4 = new cv.Mat(3, 3, cv.CV_32FC1, dataPtr4, 0);

        QUnit.assert.deepEqualWithTolerance = function( value, expected, tolerance ) {
            for (let i = 0; i < value.length; i= i+1) {
                this.pushResult( {
                    result: Math.abs(value[i]-expected[i]) < tolerance,
                    actual: value[i],
                    expected: expected[i],
                } );
            }
        };

        cv.invert(mat1, inv1, 0);
        // Verify result.
        let size = inv1.size();
        assert.equal(inv1.channels(), 1);
        assert.equal(size.height, 3);
        assert.equal(size.width, 3);
        assert.deepEqualWithTolerance(inv1.data32F, expected1, 0.0001);


        cv.invert(mat2, inv2, 0);
        // Verify result.
        assert.deepEqualWithTolerance(inv3.data32F, expected3, 0.0001);

        cv.invert(mat3, inv3, 0);
        // Verify result.
        size = inv3.size();
        assert.equal(inv3.channels(), 1);
        assert.equal(size.height, 4);
        assert.equal(size.width, 4);
        assert.deepEqualWithTolerance(inv3.data32F, expected3, 0.0001);

        cv.invert(mat3, inv3, 1);
        // Verify result.
        assert.deepEqualWithTolerance(inv3.data32F, expected3, 0.0001);

        cv.invert(mat4, inv4, 2);
        // Verify result.
        assert.deepEqualWithTolerance(inv4.data32F, expected4, 0.0001);

        cv.invert(mat4, inv4, 3);
        // Verify result.
        assert.deepEqualWithTolerance(inv4.data32F, expected4, 0.0001);

        mat1.delete();
        mat2.delete();
        mat3.delete();
        mat4.delete();
        inv1.delete();
        inv2.delete();
        inv3.delete();
        inv4.delete();
    }
});
