Accord.Tests.Imaging.HistogramsOfOrientedGradientsTest.MagnitudeDirectionTest C# (CSharp) Method

        public void MagnitudeDirectionTest()
        {
            byte[,] gradient = new byte[255, 255];

            for (int i = 0; i < 255; i++)
                for (int j = 0; j < 255; j++)
                    gradient[i, j] = (byte)j;

            UnmanagedImage output;
            new MatrixToImage().Convert(gradient, out output);

            //ImageBox.Show(output);
            HistogramsOfOrientedGradients hog = new HistogramsOfOrientedGradients();
            var result = hog.ProcessImage(output);

            float[,] actualDir = hog.Direction;
            Assert.AreEqual(255, actualDir.GetLength(0));
            Assert.AreEqual(255, actualDir.GetLength(1));

            for (int i = 0; i < 255; i++)
                for (int j = 0; j < 255; j++)
                    Assert.AreEqual(0, actualDir[i, j]);

            float[,] actualMag = hog.Magnitude;
            Assert.AreEqual(255, actualMag.GetLength(0));
            Assert.AreEqual(255, actualMag.GetLength(1));

            for (int i = 0; i < 255; i++)
            {
                for (int j = 0; j < 255; j++)
                {
                    if (i == 0 || j == 0 || i == 254 || j == 254)
                        Assert.AreEqual(0, actualMag[i, j]);
                    else
                        Assert.AreEqual(1, actualMag[i, j]);
                }
            }
        }
    }