Compare two images with C#

public enum CompareResult
                {
                        ciCompareOk,
                        ciPixelMismatch,
                        ciSizeMismatch
                };
  public static CompareResult Compare(Image bmp1, Image 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;
                                }

[本日志由 jbkadmin 于 2010-05-27 03:51 PM 编辑]
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