Ueye相机使用Qt拍摄的快照为白色

Question

我用c++编写了一个代码，用Ueye相机拍摄快照，但保存的图片只是白色的，因为有时可以看到一小段路，但仍然是白色的。我相信这是一个自动参数的问题，但我觉得好像我已经尝试了所有的东西。

以下是我的代码：

void MainWindow::CaptureImage(){
int initcamera = is_InitCamera(&hCam, hWndDisplay);

if(initcamera != IS_SUCCESS)
{
cout<<endl<<"Failed to initialize the camera"<<endl;
exit(-1);
}else{
cout<<endl<<"Initialized Camera"<<endl;
}
int camerainfo = is_GetCameraInfo (hCam, &camera_info);
if(camerainfo != IS_SUCCESS)
{
cout<<endl<<"Unable to acquire camera information"<<endl;
exit(-1);
}else{
cout<<endl<<"Camera information required"<<endl;
}

int sensorinfo = is_GetSensorInfo (hCam, &sInfo);
if(sensorinfo != IS_SUCCESS)
{
cout<<endl<<"Unable to acquire sensor information"<<endl;
exit(-1);
}else{
cout<<endl<<"Sensor information acquired"<<endl;
}

int colormode = is_SetColorMode(hCam, IS_CM_BGR8_PACKED);
if(colormode != IS_SUCCESS)
{
cout<<endl<<"Unable to set the color mode"<<endl;
exit(-1);
}else{
cout<<endl<<"Color mode set"<<endl;
}
int pXPos = (sInfo.nMaxWidth);
int pYPos = (sInfo.nMaxHeight);
int rit = is_AllocImageMem (hCam,pXPos,pYPos, 24, &m_pcImageMemory, &m_lMemoryId);
if(rit != IS_SUCCESS)
{
cout<<endl<<"UNABLE TO INITIALIZE MEMORY"<<endl;
system("PAUSE");
exit(-1);
}else{
cout<<endl<<"INITIALIZED MEMORY"<<endl;
}
int rat = is_SetImageMem (hCam, m_pcImageMemory, m_lMemoryId);
if(rat != IS_SUCCESS)
{
cout<<endl<<"UNABLE TO ACTIVATE MEMORY"<<endl;
system("PAUSE");
exit(-1);
}else{
cout<<endl<<"ACTIVATE MEMORY"<<endl;
}
double strenght_factor = 1.0;
int colorcorrection = is_SetColorCorrection(hCam, IS_CCOR_ENABLE, &strenght_factor);
double pval = 1;
int whiteb = is_SetAutoParameter(hCam, IS_SET_ENABLE_AUTO_WHITEBALANCE, &pval, 0);
double gval = 1;
int gains = is_SetAutoParameter(hCam, IS_SET_ENABLE_AUTO_GAIN, &gval, 0);

int dummy;
char *pMem, *pLast;
IMAGE_FILE_PARAMS ImageFileParams;
ImageFileParams.pwchFileName = L"./TestImage.bmp";   /// <-- Insert name and location of the image
ImageFileParams.pnImageID = NULL;
ImageFileParams.ppcImageMem = NULL;
ImageFileParams.nQuality = 0;
ImageFileParams.nFileType = IS_IMG_BMP;

int sho = is_FreezeVideo(hCam, IS_WAIT);
if(sho != IS_SUCCESS)
{
cout<<endl<<"UNABLE TO ACQUIRE FROM THE CAMERA"<<endl;
system("PAUSE");
exit(-1);
}
if (sho == IS_SUCCESS){
int m_Ret = is_GetActiveImageMem(hCam, &pLast, &dummy);
int n_Ret = is_GetImageMem(hCam, (void**)&pLast);
}
if (is_ImageFile(hCam, IS_IMAGE_FILE_CMD_SAVE, (void*)&ImageFileParams, sizeof(ImageFileParams)) == IS_SUCCESS)
{
cout << endl << "An Image was saved" << endl;
}
else
{
cout << endl << "something went wrong" << endl;
}
// Releases an image memory that was allocated
//is_FreeImageMem(hCam, pcImageMemory, nMemoryId);
// Disables the hCam camera handle and releases the data structures and memory areas taken up by the uEye camera
is_ExitCamera(hCam);
}

我试过很多东西，比如下面的参数，但它仍然是白色的。我把相机放在房间里，房间比较暗，图像也很好，所以我大胆地认为这是因为外面的日光。

const wstring filenameU(filename.begin(), filename.end());
is_ParameterSet(hCam, IS_PARAMETERSET_CMD_LOAD_FILE,(void*) filenameU.c_str(), 0);
unsigned int range[3];
memset(range, 0, sizeof(range));
is_PixelClock(hCam, IS_PIXELCLOCK_CMD_GET_RANGE, (void*)range, sizeof(range));
unsigned int maximumPixelClock = range[1];
is_PixelClock(hCam, IS_PIXELCLOCK_CMD_SET, (void*)&maximumPixelClock, sizeof(maximumPixelClock));
double pval1 = auto_exposure, pval2 = 0;
double pval1 = 1, pval2 = 0;
is_SetAutoParameter(hCam, IS_SET_ENABLE_AUTO_SENSOR_SHUTTER, &pval1, &pval2);
is_SetAutoParameter(hCam, IS_SET_ENABLE_AUTO_SHUTTER,&pval1, &pval2);
is_SetAutoParameter(hCam, IS_SET_ENABLE_AUTO_SENSOR_FRAMERATE,&pval1, &pval2);
is_SetAutoParameter(hCam, IS_SET_AUTO_WB_OFFSET, &pval1, &pval2);
int desiredFrameRate = 60;
is_SetFrameRate(hCam, desiredFrameRate, &m_actualFrameRate);

Answer 1

你不能只拍一张照片，因为曝光率可能太高。你必须拍摄一些图像，让自动曝光控制有机会降低曝光。必须捕获一些帧的原因是AEC是在软件中完成的，只有在获得一些帧时才能开始更改参数。