C# 比较两张图片是否完全相同
本文演示如何比较两张图片是否完全相同。
(注意:如果是比较两张图片是否相似,则比较复杂,涉及到机器学习)
方法一:把图片保存到内存流中,然后转化成 Base64 字符串进行比较
using System; using System.Collections.Generic; using System.Diagnostics; using System.Drawing; using System.IO; namespace CompareImage { class Program { static string sourceImageString; static string targetImageString; static List<string> _paths = new List<string>(); static void Main(string[] args) { Stopwatch stopwatch = new Stopwatch(); stopwatch.Start(); string targetImageString = GetImageBase64String(@"xxx"); //待比较的图片文件路径集合 ProcessDirectory(@"yyy"); foreach (var filePath in _paths) { string sourceImageString = GetImageBase64String(filePath); if (targetImageString.Equals(sourceImageString)) { Console.WriteLine("same"); } else { Console.WriteLine("different"); } } stopwatch.Stop(); Console.WriteLine("比较了 " + _paths.Count + " 张照片,总用时:" + stopwatch.ElapsedMilliseconds + " 毫秒"); Console.ReadLine(); } // 根据传入的文件夹路径,递归查出它包含的所有文件和文件夹,并处理各个文件夹下包含的文件 public static void ProcessDirectory(string targetDirectory) { // 处理 targetDirectory 路径下的文件列表 string[] fileEntries = Directory.GetFiles(targetDirectory); foreach (string fileName in fileEntries) { ProcessFile(fileName); } // 递归到 targetDirectory 路径下的子路径中 string[] subdirectoryEntries = Directory.GetDirectories(targetDirectory); foreach (string subdirectory in subdirectoryEntries) { ProcessDirectory(subdirectory); } } // 这里添加如何处理找到的文件的逻辑 public static void ProcessFile(string path) { if (!path.Contains(".db")) _paths.Add(path); } static string GetImageBase64String(string imagePath) { string imageString = string.Empty; using (MemoryStream memoryStream = new MemoryStream()) { using (Image image = Image.FromFile(imagePath)) { image.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Jpeg); imageString = Convert.ToBase64String(memoryStream.ToArray()); } } return imageString; } } }
方法二:按图片尺寸依次比较各个像素值(要求图片尺寸一样)
using System; using System.Diagnostics; using System.Drawing; namespace CompareImage { class Program { static void Main(string[] args) { Stopwatch stopwatch = new Stopwatch(); stopwatch.Start(); int countSame = 0; int countDifferent = 0; Bitmap bitmapSource = new Bitmap(@"xxx"); Bitmap bitmapTarget = new Bitmap(@"yyy"); //照片尺寸必须一样 for (int i = 0; i < bitmapTarget.Width; i++) { for (int j = 0; j < bitmapTarget.Height; j++) { if (bitmapSource.GetPixel(i, j).Equals(bitmapTarget.GetPixel(i, j))) { countSame++; } else { countDifferent++; } } } stopwatch.Stop(); Console.WriteLine("相同像素个数:" + countSame + ",不同像素个数:" + countDifferent + "用时:" + stopwatch.ElapsedMilliseconds + " 毫秒"); Console.ReadLine(); } } }
posted on 2019-07-08 13:48 wangzhiliang 阅读(5809) 评论(0) 编辑 收藏 举报