C# OpenCV学习笔记二之图像读写的两种方法

原文地址：

http://www.2cto.com/kf/201109/105560.html

图像显示在控件loadPictureBox上

方法一

//读取图像001.jpg

IntPtr img = CvInvoke.cvLoadImage("001.jpg", Emgu.CV.CvEnum.LOAD_IMAGE_TYPE.CV_LOAD_IMAGE_COLOR);

//IntPtr转换为Image,详细见IntPtr2Image方法

loadPictureBox.Image = IntPtr2Image(img);

//显示图像窗口

CvInvoke.cvShowImage("view", img);

//窗口保留2000毫秒，即2秒

CvInvoke.cvWaitKey(2000);

//关闭窗口

CvInvoke.cvDestroyWindow("view");

//保存图像

CvInvoke.cvSaveImage("002.jpg", img);

//释放

CvInvoke.cvReleaseImage(ref img);

 

private Image IntPtr2Image(IntPtr src)

        {

            MIplImage img = (MIplImage)Marshal.PtrToStructure(src, typeof(MIplImage));

            Bitmap disp = new Bitmap(img.width, img.height, PixelFormat.Format24bppRgb);

            BitmapData bmp = disp.LockBits(new Rectangle(0, 0, img.width, img.height), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);

            long linebytes = (img.width * 24 + 31) / 32 * 4;

            unsafe

            {

                byte* pixel = (byte*)bmp.Scan0.ToPointer();

                if (img.nChannels == 3)

                {

                    for (int i = 0; i < img.height; i++)

                    {

                        for (int j = 0, n = 0; j < img.width; j++, n++)

                        {

                            byte b = ((byte*)img.imageData + img.widthStep * i)[3 * j];

                            byte g = ((byte*)img.imageData + img.widthStep * i)[3 * j + 1];

                            byte r = ((byte*)img.imageData + img.widthStep * i)[3 * j + 2];

                            *(pixel + linebytes * (i) + n) = b;

                            n++;

                            *(pixel + linebytes * (i) + n) = g;

                            n++;

                            *(pixel + linebytes * (i) + n) = r;

                        }

                    }

                }

                else if (img.nChannels == 1)

                {

                    for (int i = 0; i < img.height; i++)

                    {

                        for (int j = 0, n = 0; j < img.width; j++, n++)

                        {

                            byte g = ((byte*)img.imageData + img.widthStep * i)[j];

                            *(pixel + linebytes * (i) + n) = g;

                            n++;

                            *(pixel + linebytes * (i) + n) = g;

                            n++;

                            *(pixel + linebytes * (i) + n) = g;

                        }

                    }

                }

                else

                {

                    return null;

                }

            }

            disp.UnlockBits(bmp);

            return (Image)disp;

        }

 

 

方法二

Image<Bgr, Byte> img = new Image<Bgr, byte>("001.jpg");

loadPictureBox.Image = img.ToBitmap();

 作者“边城骆驼 -- 每天进步百分之一”