如何比较两个图像？

Question

public void winCheck()
{
    if (button1.Image == img1)
    {
        w1 = "P2";
        button1.Image = new Bitmap(@"win_cross.png");
        button2.Image = new Bitmap(@"win_cross.png");
        button3.Image = new Bitmap(@"win_cross.png");
    }
}

这两个button1.Image并且img1具有相同的图像,但仍然,控件不会进入if块.他们的任何财产都是这样,两者的价值将是相同的.

Answer 1

如果您可以拥有unsafe代码并且希望图像在字节级别上完全相同,则可以执行此操作:

public unsafe static bool AreEqual(Bitmap b1, Bitmap b2)
{
    if (b1.Size != b2.Size)
    {
        return false;
    }

    if (b1.PixelFormat != b2.PixelFormat)
    {
        return false;
    }

    if (b1.PixelFormat != PixelFormat.Format32bppArgb)
    {
        return false;
    }

    Rectangle rect = new Rectangle(0, 0, b1.Width, b1.Height);
    BitmapData data1
        = b1.LockBits(rect, ImageLockMode.ReadOnly, b1.PixelFormat);
    BitmapData data2
        = b2.LockBits(rect, ImageLockMode.ReadOnly, b1.PixelFormat);

    int* p1 = (int*)data1.Scan0;
    int* p2 = (int*)data2.Scan0;
    int byteCount = b1.Height * data1.Stride / 4; //only Format32bppArgb 

    bool result = true;
    for (int i = 0; i < byteCount; ++i)
    {
        if (*p1++ != *p2++)
        {
            result = false;
            break;
        }
    }

    b1.UnlockBits(data1);
    b2.UnlockBits(data2);

    return result;
}

这比较"按字面意思"的图像 - 所有字节都需要完全相同.其他可能性是比较像素的颜色 - 然后PixelFormats不必相同(从这里取得):

public static CompareResult Compare(Bitmap bmp1, Bitmap bmp2)
{
    CompareResult cr = CompareResult.ciCompareOk;

    //Test to see if we have the same size of image
    if (bmp1.Size != bmp2.Size)
    {
        cr = CompareResult.ciSizeMismatch;
    }
    else
    {
        //Sizes are the same so start comparing pixels
        for (int x = 0; x < bmp1.Width 
             && cr == CompareResult.ciCompareOk; x++)
        {
            for (int y = 0; y < bmp1.Height 
                         && cr == CompareResult.ciCompareOk; y++)
            {
                if (bmp1.GetPixel(x, y) != bmp2.GetPixel(x, y))
                    cr = CompareResult.ciPixelMismatch;
            }
        }
    }
    return cr;
}

然而,这可能非常慢.相同的链接包含比较哈希值的有趣想法:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Security.Cryptography;

namespace Imagio
{
    public class ComparingImages
    {
        public enum CompareResult
        {
            ciCompareOk,
            ciPixelMismatch,
            ciSizeMismatch
        };

        public static CompareResult Compare(Bitmap bmp1, Bitmap bmp2)
        {
            CompareResult cr = CompareResult.ciCompareOk;

            //Test to see if we have the same size of image
            if (bmp1.Size != bmp2.Size)
            {
                cr = CompareResult.ciSizeMismatch;
            }
            else
            {
                //Convert each image to a byte array
                System.Drawing.ImageConverter ic = 
                       new System.Drawing.ImageConverter();
                byte[] btImage1 = new byte[1];
                btImage1 = (byte[])ic.ConvertTo(bmp1, btImage1.GetType());
                byte[] btImage2 = new byte[1];
                btImage2 = (byte[])ic.ConvertTo(bmp2, btImage2.GetType());

                //Compute a hash for each image
                SHA256Managed shaM = new SHA256Managed();
                byte[] hash1 = shaM.ComputeHash(btImage1);
                byte[] hash2 = shaM.ComputeHash(btImage2);

                //Compare the hash values
                for (int i = 0; i < hash1.Length && i < hash2.Length 
                                  && cr == CompareResult.ciCompareOk; i++)
                {
                    if (hash1[i] != hash2[i])
                        cr = CompareResult.ciPixelMismatch;
                }
            }
            return cr;
        }
    }
}