I am writing an OpenCV project using g++ and opencv 2.4.6
I have some code like this:
try
{
H = findHomography( obj, scene, CV_RANSAC );
}
catch (Exception &e)
{
if (showOutput)
cout<< "Error throwed when finding homography"<<endl;
errorCount++;
if (errorCount >=10)
{
errorCount = 0;
selected_temp = -99;
foundBB = false;
bb_x1 = 0;
bb_x2 = 0;
bb_y1 = 0;
bb_y2 = 0;
}
return -1;
}
Error will be thrown when the findHomography failed to find things. The error message includes:
OpenCV Error: Assertion failed (npoints >= 0 && points2.checkVector(2)
== npoints && points1.type() == points2.type()) in findHomography,
file /Users/dji-mini/Downloads/opencv- 2.4.6/modules/calib3d/src/fundam.cpp,
line 1074
OpenCV Error: Assertion failed (count >= 4) in cvFindHomography,
file /Users/dji-mini/Downloads/opencv-2.4.6/modules/calib3d/src/fundam.cpp, line 235
Since I know under what conditions the message would appear, I want to suppress these error messages. But I don't know how to do it.
In old version of OpenCV, there seems to have a "cvSetErrMode", which, according to other articles, is depreciated in OpenCV 2.X. So what function can I use to suppress OpenCV error messages?
cv::error() is called on every occurrence of an assertion failure. The default behavior is to print the assertion statement to std::cerr.
You can use the undocumented cv::redirectError() function to set a custom error-handling callback. This will override the default behavior of cv::error(). You first need to define a custom error-handling function:
int handleError( int status, const char* func_name,
const char* err_msg, const char* file_name,
int line, void* userdata )
{
//Do nothing -- will suppress console output
return 0; //Return value is not used
}
And then set the callback before the code which throw:
cv::redirectError(handleError);
try {
// Etc...
If at any point you wish to restore the default behavior, you can do so:
cv::redirectError(nullptr); //Restore default behavior; pass NULL if no C++11
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