Exposure¶
Exposure.cpp shows how to set a custom exposure time on a device. It relies on information provided in the Enumeration, Acquisition, and NodeMapInfo examples.
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/**
* @example Exposure.cpp
*
* @brief Exposure.cpp shows how to set a custom exposure time on a device. It
* relies on information provided in the Enumeration, Acquisition, and
* NodeMapInfo examples.
*
* This example shows the processes of preparing the camera, setting a custom
* exposure time, and restoring the camera to its default state (without power
* cycling). Ensuring custom values do not fall out of range is also touched
* on.
*
* Following this, we suggest familiarizing yourself with the ImageFormatControl
* example if you haven't already. ImageFormatControl is another example on
* camera customization that is shorter and simpler than many of the others.
* Once comfortable with Exposure and ImageFormatControl, we suggest checking
* out any of the longer, more complicated examples related to camera
* configuration: ChunkData, LookupTable, Sequencer, or Trigger.
*
* Please leave us feedback at: https://www.surveymonkey.com/r/TDYMVAPI
* More source code examples at: https://github.com/Teledyne-MV/Spinnaker-Examples
* Need help? Check out our forum at: https://teledynevisionsolutions.zendesk.com/hc/en-us/community/topics
*/
#include "Spinnaker.h"
#include "SpinGenApi/SpinnakerGenApi.h"
#include <iostream>
#include <sstream>
using namespace Spinnaker;
using namespace Spinnaker::GenApi;
using namespace Spinnaker::GenICam;
using namespace std;
// This function configures a custom exposure time. Automatic exposure is turned
// off in order to allow for the customization, and then the custom setting is
// applied.
int ConfigureExposure(INodeMap& nodeMap)
{
int result = 0;
cout << endl << endl << "*** CONFIGURING EXPOSURE ***" << endl << endl;
try
{
//
// Turn off automatic exposure mode
//
// *** NOTES ***
// Automatic exposure prevents the manual configuration of exposure
// time and needs to be turned off. Some models have auto-exposure
// turned off by default
//
// *** LATER ***
// Exposure time can be set automatically or manually as needed. This
// example turns automatic exposure off to set it manually and back
// on in order to return the camera to its default state.
//
CEnumerationPtr ptrExposureAuto = nodeMap.GetNode("ExposureAuto");
if (IsReadable(ptrExposureAuto) && IsWritable(ptrExposureAuto))
{
CEnumEntryPtr ptrExposureAutoOff = ptrExposureAuto->GetEntryByName("Off");
if (IsReadable(ptrExposureAutoOff))
{
ptrExposureAuto->SetIntValue(ptrExposureAutoOff->GetValue());
cout << "Automatic exposure disabled..." << endl;
}
}
else
{
CEnumerationPtr ptrAutoBright = nodeMap.GetNode("autoBrightnessMode");
if (!IsReadable(ptrAutoBright) || !IsWritable(ptrAutoBright))
{
cout << "Unable to get or set exposure time. Aborting..." << endl << endl;
return -1;
}
cout << "Unable to disable automatic exposure. Expected for some models... " << endl;
cout << "Proceeding..." << endl;
result = 1;
}
//
// Set exposure time manually; exposure time recorded in microseconds
//
// *** NOTES ***
// The node is checked for availability and writability prior to the
// setting of the node. Further, it is ensured that the desired exposure
// time does not exceed the maximum. Exposure time is counted in
// microseconds. This information can be found out either by
// retrieving the unit with the GetUnit() method or by checking SpinView.
//
CFloatPtr ptrExposureTime = nodeMap.GetNode("ExposureTime");
if (!IsReadable(ptrExposureTime) || !IsWritable(ptrExposureTime))
{
cout << "Unable to get or set exposure time. Aborting..." << endl << endl;
return -1;
}
// Ensure desired exposure time does not exceed the maximum
const double exposureTimeMax = ptrExposureTime->GetMax();
double exposureTimeToSet = 500000.0;
if (exposureTimeToSet > exposureTimeMax)
{
exposureTimeToSet = exposureTimeMax;
}
ptrExposureTime->SetValue(exposureTimeToSet);
cout << std::fixed << "Exposure time set to " << exposureTimeToSet << " us..." << endl << endl;
}
catch (Spinnaker::Exception& e)
{
cout << "Error: " << e.what() << endl;
result = -1;
}
return result;
}
// This function returns the camera to its default state by re-enabling automatic
// exposure.
int ResetExposure(INodeMap& nodeMap)
{
int result = 0;
try
{
//
// Turn automatic exposure back on
//
// *** NOTES ***
// Automatic exposure is turned on in order to return the camera to its
// default state.
//
CEnumerationPtr ptrExposureAuto = nodeMap.GetNode("ExposureAuto");
if (!IsReadable(ptrExposureAuto) || !IsWritable(ptrExposureAuto))
{
cout << "Unable to enable automatic exposure (node retrieval). Non-fatal error..." << endl << endl;
return -1;
}
CEnumEntryPtr ptrExposureAutoContinuous = ptrExposureAuto->GetEntryByName("Continuous");
if (!IsReadable(ptrExposureAutoContinuous))
{
cout << "Unable to enable automatic exposure (enum entry retrieval). Non-fatal error..." << endl << endl;
return -1;
}
ptrExposureAuto->SetIntValue(ptrExposureAutoContinuous->GetValue());
cout << "Automatic exposure enabled..." << endl << endl;
}
catch (Spinnaker::Exception& e)
{
cout << "Error: " << e.what() << endl;
result = -1;
}
return result;
}
// This function prints the device information of the camera from the transport
// layer; please see NodeMapInfo example for more in-depth comments on printing
// device information from the nodemap.
int PrintDeviceInfo(INodeMap& nodeMap)
{
int result = 0;
cout << endl << "*** DEVICE INFORMATION ***" << endl << endl;
try
{
FeatureList_t features;
CCategoryPtr category = nodeMap.GetNode("DeviceInformation");
if (IsReadable(category))
{
category->GetFeatures(features);
FeatureList_t::const_iterator it;
for (it = features.begin(); it != features.end(); ++it)
{
try
{
CNodePtr pfeatureNode = *it;
cout << pfeatureNode->GetName() << " : ";
CValuePtr pValue = (CValuePtr)pfeatureNode;
cout << (IsReadable(pValue) ? pValue->ToString() : gcstring("Node not readable"));
cout << endl;
}
catch (Spinnaker::Exception)
{
cout << "Node not readable" << endl;
}
}
}
else
{
cout << "Device control information not readable." << endl;
}
}
catch (Spinnaker::Exception& e)
{
cout << "Error: " << e.what() << endl;
result = -1;
}
return result;
}
// This function acquires and saves 10 images from a device; please see
// Acquisition example for more in-depth comments on acquiring images.
int AcquireImages(CameraPtr pCam, INodeMap& nodeMap, INodeMap& nodeMapTLDevice)
{
int result = 0;
cout << endl << "*** IMAGE ACQUISITION ***" << endl << endl;
try
{
// Set acquisition mode to continuous
CEnumerationPtr ptrAcquisitionMode = nodeMap.GetNode("AcquisitionMode");
if (!IsReadable(ptrAcquisitionMode) || !IsWritable(ptrAcquisitionMode))
{
cout << "Unable to get or set acquisition mode to continuous (node retrieval). Aborting..." << endl << endl;
return -1;
}
CEnumEntryPtr ptrAcquisitionModeContinuous = ptrAcquisitionMode->GetEntryByName("Continuous");
if (!IsReadable(ptrAcquisitionModeContinuous))
{
cout << "Unable to get acquisition mode to continuous (entry 'continuous' retrieval). Aborting..." << endl
<< endl;
return -1;
}
int64_t acquisitionModeContinuous = ptrAcquisitionModeContinuous->GetValue();
ptrAcquisitionMode->SetIntValue(acquisitionModeContinuous);
cout << "Acquisition mode set to continuous..." << endl;
// Begin acquiring images
pCam->BeginAcquisition();
cout << "Acquiring images..." << endl;
// Retrieve device serial number for filename
gcstring deviceSerialNumber("");
CStringPtr ptrStringSerial = nodeMapTLDevice.GetNode("DeviceSerialNumber");
if (IsReadable(ptrStringSerial))
{
deviceSerialNumber = ptrStringSerial->GetValue();
cout << "Device serial number retrieved as " << deviceSerialNumber << "..." << endl;
}
cout << endl;
// Get the value of exposure time to set an appropriate timeout for GetNextImage
CFloatPtr ptrExposureTime = nodeMap.GetNode("ExposureTime");
if (!IsReadable(ptrExposureTime))
{
cout << "Unable to read exposure time. Aborting..." << endl << endl;
return -1;
}
// The exposure time is retrieved in µs so it needs to be converted to ms to keep consistency with the unit
// being used in GetNextImage
uint64_t timeout = static_cast<uint64_t>(ptrExposureTime->GetValue() / 1000 + 1000);
// Retrieve, convert, and save images
const unsigned int k_numImages = 5;
//
// Create ImageProcessor instance for post processing images
//
ImageProcessor processor;
//
// Set default image processor color processing method
//
// *** NOTES ***
// By default, if no specific color processing algorithm is set, the image
// processor will default to NEAREST_NEIGHBOR method.
//
processor.SetColorProcessing(SPINNAKER_COLOR_PROCESSING_ALGORITHM_HQ_LINEAR);
for (unsigned int imageCnt = 0; imageCnt < k_numImages; imageCnt++)
{
try
{
// Retrieve next received image and ensure image completion
// By default, GetNextImage will block indefinitely until an image arrives.
// In this example, the timeout value is set to [exposure time + 1000]ms to ensure that an image has
// enough time to arrive under normal conditions
ImagePtr pResultImage = pCam->GetNextImage(timeout);
if (pResultImage->IsIncomplete())
{
cout << "Image incomplete with image status " << pResultImage->GetImageStatus() << "..." << endl
<< endl;
}
else
{
// Print image information
cout << "Grabbed image " << imageCnt << ", width = " << pResultImage->GetWidth()
<< ", height = " << pResultImage->GetHeight() << endl;
// Convert image to mono 8
ImagePtr convertedImage = processor.Convert(pResultImage, PixelFormat_Mono8);
// Create a unique filename
ostringstream filename;
filename << "Exposure-";
if (deviceSerialNumber != "")
{
filename << deviceSerialNumber.c_str() << "-";
}
filename << imageCnt << ".jpg";
// Save image
convertedImage->Save(filename.str().c_str());
cout << "Image saved at " << filename.str() << endl;
}
// Release image
pResultImage->Release();
cout << endl;
}
catch (Spinnaker::Exception& e)
{
cout << "Error: " << e.what() << endl;
result = -1;
}
}
// End acquisition
pCam->EndAcquisition();
}
catch (Spinnaker::Exception& e)
{
cout << "Error: " << e.what() << endl;
result = -1;
}
return result;
}
// This function acts as the body of the example; please see NodeMapInfo example
// for more in-depth comments on setting up cameras.
int RunSingleCamera(CameraPtr pCam)
{
int result = 0;
int err = 0;
try
{
// Retrieve TL device nodemap and print device information
INodeMap& nodeMapTLDevice = pCam->GetTLDeviceNodeMap();
result = PrintDeviceInfo(nodeMapTLDevice);
// Initialize camera
pCam->Init();
// Retrieve GenICam nodemap
INodeMap& nodeMap = pCam->GetNodeMap();
// Configure exposure
err = ConfigureExposure(nodeMap);
if (err < 0)
{
return err;
}
// Acquire images
result = result | AcquireImages(pCam, nodeMap, nodeMapTLDevice);
// Reset exposure
if (err == 0)
{
result = result | ResetExposure(nodeMap);
}
else
{
cout << "Skipping exposure reset" << endl << endl;
}
// Deinitialize camera
pCam->DeInit();
}
catch (Spinnaker::Exception& e)
{
cout << "Error: " << e.what() << endl;
result = -1;
}
return result;
}
// Example entry point; please see Enumeration example for additional
// comments on the steps in this function.
int main(int /*argc*/, char** /*argv*/)
{
// Since this application saves images in the current folder
// we must ensure that we have permission to write to this folder.
// If we do not have permission, fail right away.
FILE* tempFile = fopen("test.txt", "w+");
if (tempFile == nullptr)
{
cout << "Failed to create file in current folder. Please check "
"permissions."
<< endl;
cout << "Press Enter to exit..." << endl;
getchar();
return -1;
}
fclose(tempFile);
remove("test.txt");
int result = 0;
// Print application build information
cout << "Application build date: " << __DATE__ << " " << __TIME__ << endl << endl;
// Retrieve singleton reference to system object
SystemPtr system = System::GetInstance();
// Print out current library version
const LibraryVersion spinnakerLibraryVersion = system->GetLibraryVersion();
cout << "Spinnaker library version: " << spinnakerLibraryVersion.major << "." << spinnakerLibraryVersion.minor
<< "." << spinnakerLibraryVersion.type << "." << spinnakerLibraryVersion.build << endl
<< endl;
// Retrieve list of cameras from the system
CameraList camList = system->GetCameras();
unsigned int numCameras = camList.GetSize();
cout << "Number of cameras detected: " << numCameras << endl << endl;
// Finish if there are no cameras
if (numCameras == 0)
{
// Clear camera list before releasing system
camList.Clear();
// Release system
system->ReleaseInstance();
cout << "Not enough cameras!" << endl;
cout << "Done! Press Enter to exit..." << endl;
getchar();
return -1;
}
// Run example on each camera
for (unsigned int i = 0; i < numCameras; i++)
{
cout << endl << "Running example for camera " << i << "..." << endl;
result = result | RunSingleCamera(camList.GetByIndex(i));
cout << "Camera " << i << " example complete..." << endl << endl;
}
// Clear camera list before releasing system
camList.Clear();
// Release system
system->ReleaseInstance();
cout << endl << "Done! Press Enter to exit..." << endl;
getchar();
return result;
}