在图像中查找图像 C#

我扫描了一份文档（实际上是一份表格），其中包含一些手写信息。

我有一个空表单的位图。

我如何“取消”打印表格以仅提取手写内容。

我用C#... 谢谢 乔纳森

您要做的就是从带有手写内容的表单图像中减去空表单图像。这将为您提供仅笔迹的合理图像。

请注意，这不会注册图像。配准会将它们排列起来，使它们处于相同的方向，从而为减法提供最大的成功机会。如果您的图像对齐不佳，则必须检查图像配准。

这是我不久前编写的一段代码，用于执行类似的操作（此代码以红色突出显示差异）：

        Bitmap b1 = new Bitmap(fname1);
        Bitmap b2 = new Bitmap(fname2);

        if (b1.Height != b2.Height || b1.Width != b2.Width) {
           MessageBox.Show("Input files are not the same dimensions!");
           Application.Exit();
        }

        totalPixels = b1.Height * b1.Width * 4;

        Bitmap outImg = new Bitmap(b1.Width, b1.Height, System.Drawing.Imaging.PixelFormat.Format32bppRgb);

        BitmapData b1Data = b1.LockBits(new Rectangle(0, 0, b1.Width, b1.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
        BitmapData b2Data = b2.LockBits(new Rectangle(0, 0, b1.Width, b1.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppRgb);
        BitmapData oData = outImg.LockBits(new Rectangle(0, 0, b1.Width, b1.Height), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppRgb);

        byte[] cur1 = new byte[b1Data.Stride * b1Data.Height];
        byte[] cur2 = new byte[b2Data.Stride * b2Data.Height];
        byte[] curOut = new byte[b2Data.Stride * b2Data.Height];

        Marshal.Copy(b1Data.Scan0, cur1, 0, b1Data.Stride * b1Data.Height);
        Marshal.Copy(b2Data.Scan0, cur2, 0, b2Data.Stride * b2Data.Height);

        for (int i = 0; i < b1Data.Stride * b1Data.Height; i += 4) {
           byte temp1 = cur1[i], temp2 = cur2[i], first = 0, second = 0;
           curOut[i] = 0;
           first = (byte) ((temp1 > temp2) ? temp1 - temp2 : temp2 - temp1);

           temp1 = cur1[i + 1];
           temp2 = cur2[i + 1];
           curOut[i + 1] = 0;
           second = (byte) ((temp1 > temp2) ? temp1 - temp2 : temp2 - temp1);

           temp1 = cur1[i + 2];
           temp2 = cur2[i + 2];
           curOut[i + 2] = (byte) ((temp1 > temp2) ? temp1 - temp2 : temp2 - temp1);
           curOut[i + 2] = (byte) ((first + second + curOut[i + 2]) * 255);

           curPixel = i;
        }

        Marshal.Copy(curOut, 0, oData.Scan0, b2Data.Stride * b2Data.Height);

        b1.UnlockBits(b1Data);
        b2.UnlockBits(b2Data);
        outImg.UnlockBits(oData);

        outImg.Save(outfile);