ImageProcess.cpp

图像处理

该示例程序说明了如何实现图像像素格式转换和图像保存两个功能。在获取到图像数据后可以使用 MV_CC_ConvertPixelType() 进行数据格式转换，使用 MV_CC_SaveImageEx2() 进行图像保存。

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include "MvCameraControl.h"

// 等待用户输入enter键来结束取流或结束程序
// wait for user to input enter to stop grabbing or end the sample program
void PressEnterToExit(void)
{
    int c;
    while ( (c = getchar()) != '\n' && c != EOF );
    fprintf( stderr, "\nPress enter to exit.\n");
    while( getchar() != '\n');
}

bool PrintDeviceInfo(MV_CC_DEVICE_INFO* pstMVDevInfo)
{
    if (NULL == pstMVDevInfo)
    {
        printf("The Pointer of pstMVDevInfo is NULL!\n");
        return false;
    }
    if (pstMVDevInfo->nTLayerType == MV_GIGE_DEVICE)
    {
        int nIp1 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0xff000000) >> 24);
        int nIp2 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x00ff0000) >> 16);
        int nIp3 = ((pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x0000ff00) >> 8);
        int nIp4 = (pstMVDevInfo->SpecialInfo.stGigEInfo.nCurrentIp & 0x000000ff);

        // ch:打印当前相机ip和用户自定义名字 | en:print current ip and user defined name
        printf("Device Model Name: %s\n", pstMVDevInfo->SpecialInfo.stGigEInfo.chModelName);
        printf("CurrentIp: %d.%d.%d.%d\n" , nIp1, nIp2, nIp3, nIp4);
        printf("UserDefinedName: %s\n\n" , pstMVDevInfo->SpecialInfo.stGigEInfo.chUserDefinedName);
    }
    else if (pstMVDevInfo->nTLayerType == MV_USB_DEVICE)
    {
        printf("Device Model Name: %s\n", pstMVDevInfo->SpecialInfo.stUsb3VInfo.chModelName);
        printf("UserDefinedName: %s\n\n", pstMVDevInfo->SpecialInfo.stUsb3VInfo.chUserDefinedName);
    }
    else
    {
        printf("Not support.\n");
    }

    return true;
}

int main()
{
    int nRet = MV_OK;

    void* handle = NULL;
    unsigned char * pData = NULL;        
    unsigned char *pDataForRGB = NULL;
    unsigned char *pDataForSaveImage = NULL;
    do 
    {
        MV_CC_DEVICE_INFO_LIST stDeviceList;
        memset(&stDeviceList, 0, sizeof(MV_CC_DEVICE_INFO_LIST));

        // 枚举设备
        // enum device
        nRet = MV_CC_EnumDevices(MV_GIGE_DEVICE | MV_USB_DEVICE, &stDeviceList);
        if (MV_OK != nRet)
        {
            printf("MV_CC_EnumDevices fail! nRet [%x]\n", nRet);
            break;
        }
        if (stDeviceList.nDeviceNum > 0)
        {
            for (int i = 0; i < stDeviceList.nDeviceNum; i++)
            {
                printf("[device %d]:\n", i);
                MV_CC_DEVICE_INFO* pDeviceInfo = stDeviceList.pDeviceInfo[i];
                if (NULL == pDeviceInfo)
                {
                    break;
                } 
                PrintDeviceInfo(pDeviceInfo);            
            }  
        } 
        else
        {
            printf("Find No Devices!\n");
            break;
        }

        printf("Please Intput camera index: ");
        unsigned int nIndex = 0;
        scanf("%d", &nIndex);

        if (nIndex >= stDeviceList.nDeviceNum)
        {
            printf("Intput error!\n");
            break;
        }

        // 选择设备并创建句柄
        // select device and create handle
        nRet = MV_CC_CreateHandle(&handle, stDeviceList.pDeviceInfo[nIndex]);
        if (MV_OK != nRet)
        {
            printf("MV_CC_CreateHandle fail! nRet [%x]\n", nRet);
            break;
        }

        // 打开设备
        // open device
        nRet = MV_CC_OpenDevice(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_OpenDevice fail! nRet [%x]\n", nRet);
            break;
        }
        
        // ch:探测网络最佳包大小(只对GigE相机有效) | en:Detection network optimal package size(It only works for the GigE camera)
        if (stDeviceList.pDeviceInfo[nIndex]->nTLayerType == MV_GIGE_DEVICE)
        {
            int nPacketSize = MV_CC_GetOptimalPacketSize(handle);
            if (nPacketSize > 0)
            {
                nRet = MV_CC_SetIntValue(handle,"GevSCPSPacketSize",nPacketSize);
                if(nRet != MV_OK)
                {
                    printf("Warning: Set Packet Size fail nRet [0x%x]!\n", nRet);
                }
            }
            else
            {
                printf("Warning: Get Packet Size fail nRet [0x%x]!\n", nPacketSize);
            }
        }
        
        nRet = MV_CC_SetEnumValue(handle, "TriggerMode", 0);
        if (MV_OK != nRet)
        {
            printf("MV_CC_SetTriggerMode fail! nRet [%x]\n", nRet);
            break;
        }

        // ch:获取数据包大小 | en:Get payload size
        MVCC_INTVALUE stParam;
        memset(&stParam, 0, sizeof(MVCC_INTVALUE));
        nRet = MV_CC_GetIntValue(handle, "PayloadSize", &stParam);
        if (MV_OK != nRet)
        {
            printf("Get PayloadSize fail! nRet [0x%x]\n", nRet);
            break;
        }

        // 开始取流
        // start grab image
        nRet = MV_CC_StartGrabbing(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_StartGrabbing fail! nRet [%x]\n", nRet);
            break;
        }

        MV_FRAME_OUT_INFO_EX stImageInfo = {0};
        memset(&stImageInfo, 0, sizeof(MV_FRAME_OUT_INFO_EX));
        pData = (unsigned char *)malloc(sizeof(unsigned char) * stParam.nCurValue);
        if (NULL == pData)
        {
            break;
        }
        unsigned int nDataSize = stParam.nCurValue;

        nRet = MV_CC_GetOneFrameTimeout(handle, pData, nDataSize, &stImageInfo, 1000);
        if (nRet == MV_OK)
        {
            printf("Now you GetOneFrame, Width[%d], Height[%d], nFrameNum[%d]\n\n", 
                stImageInfo.nWidth, stImageInfo.nHeight, stImageInfo.nFrameNum);


            // 处理图像
            // image processing
            printf("input 0 to do nothing, 1 to convert RGB, 2 to save as BMP\n");
            int nInput = 0;
            scanf("%d", &nInput);
            switch (nInput)
            {
                // 不做任何事，继续往下走
                // do nothing, and go on next
            case 0: 
                {
                    break;
                }
                // 转换图像为RGB格式，用户可根据自身需求转换其他格式
                // convert image format to RGB, user can convert to other format by their requirement
            case 1: 
                {
                    pDataForRGB = (unsigned char*)malloc(stImageInfo.nWidth * stImageInfo.nHeight * 4 + 2048);
                    if (NULL == pDataForRGB)
                    {
                        break;
                    }
                    // 像素格式转换
                    // convert pixel format 
                    MV_CC_PIXEL_CONVERT_PARAM stConvertParam = {0};
                    // 从上到下依次是：图像宽，图像高，输入数据缓存，输入数据大小，源像素格式，
                    // 目标像素格式，输出数据缓存，提供的输出缓冲区大小
                    // Top to bottom are：image width, image height, input data buffer, input data size, source pixel format, 
                    // destination pixel format, output data buffer, provided output buffer size
                    stConvertParam.nWidth = stImageInfo.nWidth;
                    stConvertParam.nHeight = stImageInfo.nHeight;
                    stConvertParam.pSrcData = pData;
                    stConvertParam.nSrcDataLen = stImageInfo.nFrameLen;
                    stConvertParam.enSrcPixelType = stImageInfo.enPixelType;
                    stConvertParam.enDstPixelType = PixelType_Gvsp_RGB8_Packed;
                    stConvertParam.pDstBuffer = pDataForRGB;
                    stConvertParam.nDstBufferSize = stImageInfo.nWidth * stImageInfo.nHeight *  4 + 2048;
                    nRet = MV_CC_ConvertPixelType(handle, &stConvertParam);
                    if (MV_OK != nRet)
                    {
                        printf("MV_CC_ConvertPixelType fail! nRet [%x]\n", nRet);
                        break;
                    }

                    FILE* fp = fopen("AfterConvert_RGB.raw", "wb");
                    if (NULL == fp)
                    {
                        printf("fopen failed\n");
                        break;
                    }
                    fwrite(pDataForRGB, 1, stConvertParam.nDstLen, fp);
                    fclose(fp);
                    printf("convert succeed\n");
                    break;
                }
            case 2:
                {
                    pDataForSaveImage = (unsigned char*)malloc(stImageInfo.nWidth * stImageInfo.nHeight * 4 + 2048);
                    if (NULL == pDataForSaveImage)
                    {
                        break;
                    }
                    // 填充存图参数
                    // fill in the parameters of save image
                    MV_SAVE_IMAGE_PARAM_EX stSaveParam;
                    memset(&stSaveParam, 0, sizeof(MV_SAVE_IMAGE_PARAM_EX));
                    // 从上到下依次是：输出图片格式，输入数据的像素格式，提供的输出缓冲区大小，图像宽，
                    // 图像高，输入数据缓存，输出图片缓存，JPG编码质量
                    // Top to bottom are：
                    stSaveParam.enImageType = MV_Image_Bmp; 
                    stSaveParam.enPixelType = stImageInfo.enPixelType; 
                    stSaveParam.nBufferSize = stImageInfo.nWidth * stImageInfo.nHeight * 4 + 2048;
                    stSaveParam.nWidth      = stImageInfo.nWidth; 
                    stSaveParam.nHeight     = stImageInfo.nHeight; 
                    stSaveParam.pData       = pData;
                    stSaveParam.nDataLen    = stImageInfo.nFrameLen;
                    stSaveParam.pImageBuffer = pDataForSaveImage;
                    stSaveParam.nJpgQuality = 80;

                    nRet = MV_CC_SaveImageEx2(handle, &stSaveParam);
                    if(MV_OK != nRet)
                    {
                        printf("failed in MV_CC_SaveImage,nRet[%x]\n", nRet);
                        break;
                    }

                    FILE* fp = fopen("image.bmp", "wb");
                    if (NULL == fp)
                    {
                        printf("fopen failed\n");
                        break;
                    }
                    fwrite(pDataForSaveImage, 1, stSaveParam.nImageLen, fp);
                    fclose(fp);
                    printf("save image succeed\n");
                    break;
                }
            default:
                break;
            }
        }

        // 停止取流
        // end grab image
        nRet = MV_CC_StopGrabbing(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_StopGrabbing fail! nRet [%x]\n", nRet);
            break;
        }

        // 销毁句柄
        // destroy handle
        nRet = MV_CC_DestroyHandle(handle);
        if (MV_OK != nRet)
        {
            printf("MV_CC_DestroyHandle fail! nRet [%x]\n", nRet);
            break;
        }
    } while (0);

    if (nRet != MV_OK)
    {
        if (handle != NULL)
        {
            MV_CC_DestroyHandle(handle);
            handle = NULL;
        }
    }
    if (pData)
    {
        free(pData);    
        pData = NULL;
    }
    if (pDataForRGB)
    {
        free(pDataForRGB);
        pDataForRGB = NULL;
    }
    if (pDataForSaveImage)
    {
        free(pDataForSaveImage);
        pDataForSaveImage = NULL;
    }

    PressEnterToExit();
    printf("exit\n");
    return 0;
}