通过C#来实现,二张JPG图片请问如何对比它的相似度，例如：90% ,100% ,60%？

Question

二张JPG图片请问如何对比它的相似度，例如：90% ,100% ,,60%？

我给图片，请看一下，是二张监控图片，请问相似度如何计算？通过C#来实现。

Answer 1

c# 的话 用OpenCVSharp 会简单些

 float Similar(Mat src, Mat src2)
        {
            Mat gray1 = new Mat(src.Size(), src.Type()),
                gray2 = new Mat(src2.Size(), src2.Type());
            Cv2.CvtColor(src, gray1, ColorConversionCodes.BGR2GRAY);
            Cv2.CvtColor(src2, gray2, ColorConversionCodes.BGR2GRAY);

            var size = new OpenCvSharp.Size(512, 512);
            using (var scaledImg1 = gray1.Resize(size))
            using (var scaledImg2 = gray2.Resize(size))
            {
                Cv2.Threshold(scaledImg1, scaledImg1, 128, 255, ThresholdTypes.BinaryInv);
                Cv2.Threshold(scaledImg2, scaledImg2, 128, 255, ThresholdTypes.BinaryInv);
                Mat res = new Mat(size, scaledImg1.Type());
                Cv2.Absdiff(scaledImg1, scaledImg2, res);
                var all = (float)scaledImg1.Sum();
                var result = (float)res.Sum();
                return (1 - result / all);
            }
        }