C#联合halcon开发，连接相机颜色不对，无法连接相机

相机可以在海康软件MVS中打开（颜色正常），但是在C#开发的程式中无法打开（彩色相机颜色显示异常）。

1.异常处理

1.查看相机和MVS软件是否连接成功；
2.如果成功，连接C#程序；
3.程序连接失败，在MVS中连接相机，查看MVS里面相机的图像处理-像素格式，确定相机是否为黑白还是彩色相机，如下图：

由上图可知该相机为彩色相机。

4.  如果是彩色相机，但是颜色显示不对，根据彩色相机默认格式（可以将相机断电重新启动，再打开MVS软件连接查看默认图像格式），修改程序以下两个地方

Camera.MV_CC_SetEnumValueByString_NET("PixelFormat", "BayerRG8");

 HOperatorSet.GenImage1(out image, "byte", frame.stFrameInfo.nWidth, frame.stFrameInfo.nHeight, frame.pBufAddr);
 image = BayerToRgb(image, "bayer_rg");
 image = RotateImage(image);

根据不同于颜色的排列，我们把Bayer分为BayerRG、BayerBG、BayerGB、BayerBG四种。

工业相机支持的图像格式种类，以海康工业相机为例子

2.代码片段

连接相机封装类，以海康相机为例，程序要成功运行需要安装MVS软件，C#二次开发类，如下：

using HalconDotNet;
using MvCamCtrl.NET;

public class SvLucid
    {
        private MyCamera Camera;

        public override void Initial()
        {
            try
            {
                base.Initial();
                Camera = new MyCamera();
                var infoList = new MyCamera.MV_CC_DEVICE_INFO_LIST();
                MyCamera.MV_CC_EnumDevices_NET(MyCamera.MV_GIGE_DEVICE, ref infoList);

                var result = -1;
                for (int i = 0; i < infoList.nDeviceNum; i++)
                {
                    var deviceInfo = (MyCamera.MV_CC_DEVICE_INFO)Marshal.PtrToStructure(infoList.pDeviceInfo[i], typeof(MyCamera.MV_CC_DEVICE_INFO));
                    if (((MyCamera.MV_GIGE_DEVICE_INFO)MyCamera.ByteToStruct(deviceInfo.SpecialInfo.stGigEInfo, typeof(MyCamera.MV_GIGE_DEVICE_INFO))).chSerialNumber == SN)
                    {
                        Camera.MV_CC_CreateDevice_NET(ref deviceInfo);
                        result = Camera.MV_CC_OpenDevice_NET();
                    }
                }

                if (result != 0)
                {
                    throw new Exception($"相機{SN}連接失敗");
                }

                result = 0;
                if (Colorful == "黑白")
                {
                    result += Camera.MV_CC_SetEnumValueByString_NET("PixelFormat", "Mono8");
                }
                else
                {
                    result += Camera.MV_CC_SetEnumValueByString_NET("PixelFormat", "BayerRG8");
                    result += Camera.MV_CC_SetEnumValueByString_NET("BalanceWhiteAuto", "Off");
                    result += Camera.MV_CC_SetEnumValueByString_NET("BalanceRatioSelector", "Red");
                    result += Camera.MV_CC_SetFloatValue_NET("BalanceRatio", 2f);
                    result += Camera.MV_CC_SetEnumValueByString_NET("BalanceRatioSelector", "Green");
                    result += Camera.MV_CC_SetFloatValue_NET("BalanceRatio", 1f);
                    result += Camera.MV_CC_SetEnumValueByString_NET("BalanceRatioSelector", "Blue");
                    result += Camera.MV_CC_SetFloatValue_NET("BalanceRatio", 2f);
                }

                result += Camera.MV_CC_SetIntValue_NET("GevSCPSPacketSize", 9000);
                result += Camera.MV_CC_SetIntValue_NET("GevSCPD", 80);
                result += Camera.MV_CC_SetEnumValueByString_NET("TriggerSelector", "FrameStart");
                result += Camera.MV_CC_SetEnumValueByString_NET("TriggerMode", "On");
                result += Camera.MV_CC_SetEnumValueByString_NET("TriggerSource", "Software");
                result += Camera.MV_CC_SetEnumValueByString_NET("TriggerActivation", "RisingEdge");
                result += Camera.MV_CC_SetEnumValue_NET("ExposureAuto", 0);
                result += Camera.MV_CC_SetEnumValue_NET("GainAuto", 0);
                result += Camera.MV_CC_SetFloatValue_NET("ExposureTime", (float)Exposure);
                result += Camera.MV_CC_SetFloatValue_NET("Gain", (float)Gain);
                result += Camera.MV_CC_StartGrabbing_NET();

                if (result != 0)
                {
                    throw new Exception($"相機{SN}開啟失敗");
                }

                Thread.Sleep(500);
                Snap();
            }
            catch (Exception ex)
            {
                SvMaster.Log.WriteError(ex);
            }
        }

        public override void Close()
        {
            try
            {
                Camera.MV_CC_StopGrabbing_NET();
                Camera.MV_CC_CloseDevice_NET();
                Camera.MV_CC_DestroyDevice_NET();
            }
            catch (Exception ex)
            {
                SvMaster.Log.WriteError(ex);
            }
        }

        public override void AdaptCamera()
        {
            try
            {
                Camera.MV_CC_SetFloatValue_NET("ExposureTime", (float)Exposure);
                Camera.MV_CC_SetFloatValue_NET("Gain", (float)Gain);
            }
            catch (Exception ex)
            {
                SvMaster.Log.WriteError(ex);
            }
        }


        public override HObject Snap()
        {
            HObject image = null;
            var frame = new MyCamera.MV_FRAME_OUT();
            try
            {
                Camera.MV_CC_SetCommandValue_NET("TriggerSoftware");
                if (Camera.MV_CC_GetImageBuffer_NET(ref frame, 2000) == 0)
                {
                    if (frame.stFrameInfo.nLostPacket > 0)
                    {
                        throw new Exception($"相機{SN}取像丢帧失敗");
                    }
                    HOperatorSet.GenImage1(out image, "byte", frame.stFrameInfo.nWidth, frame.stFrameInfo.nHeight, frame.pBufAddr);
                    image = BayerToRgb(image, "bayer_rg");
                    image = RotateImage(image);
                }
                else
                {
                    throw new Exception($"相機{SN}取像失敗");
                }
            }
            catch (Exception ex)
            {
                SvMaster.Log.WriteError(ex);
            }
            Camera.MV_CC_FreeImageBuffer_NET(ref frame);
            return image;
        }

    }

 说明： 引用MvCameraControl.Net.dll，在MVS安装目录下可以找到，可以在项目中引用。