Beispiel #1
0
        static void Compare(string bmp1, string bmp2, byte threshold = 5)
        {
            //get the full path of the images
            string image1Path = Path.Combine(sampleImagesFolder.FullName, bmp1);
            string image2Path = Path.Combine(sampleImagesFolder.FullName, bmp2);

            //compare the two
            Console.Write("Comparing: " + bmp1 + " and " + bmp2 + ", with a threshold of " + threshold);
            Bitmap firstBmp = (Bitmap)Image.FromFile(image1Path);
            Bitmap secondBmp = (Bitmap)Image.FromFile(image2Path);
            //get the difference as a bitmap
            firstBmp.GetDifferenceImage(secondBmp,true)
                .Save(image1Path + "_diff.png");
            Console.WriteLine(string.Format("Difference: {0:0.0} %", firstBmp.PercentageDifference(secondBmp, threshold) * 100));
            //Console.WriteLine("ENTER see histogram for " + bmp1);
            //Console.ReadLine();
            Console.WriteLine();
            Console.WriteLine("Creating histogram for " + bmp1);
            Histogram hist = new Histogram(firstBmp);
               // hist.Visualize().Save(image1Path + "_hist.png");
            Console.WriteLine(hist.ToString());
            Console.WriteLine("ENTER to continue...");
            Console.ReadLine();
        }
Beispiel #2
0
        /// <summary>
        /// Gets the variance between two histograms (http://en.wikipedia.org/wiki/Variance) as a percentage of the maximum possible variance: 256 (for a white image compared to a black image)
        /// </summary>
        /// <param name="histogram">the histogram to compare this one to</param>
        /// <returns>A percentage which tells how different the two histograms are</returns>
        public float GetVariance(Histogram histogram)
        {
            //
            double diffRed = 0, diffGreen = 0, diffBlue = 0;
            for (int i = 0; i < 256; i++)
            {
                diffRed += Math.Pow(Red[i] - histogram.Red[i], 2);
                diffGreen += Math.Pow(Green[i] - histogram.Green[i], 2);
                diffBlue += Math.Pow(Blue[i] - histogram.Blue[i], 2);
            }

            diffRed /= 256;
            diffGreen /= 256;
            diffBlue /= 256;
            const double maxDiff = 512;
            return (float)(diffRed / maxDiff + diffGreen / maxDiff + diffBlue / maxDiff) / 3;
        }