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Hi there, I'm trying to use ORB points of interest to try to retrieve an object into an image (compute points of interest; then associated descriptors and finally try to see if we can pair them and retrieve a transformation).

Here is a part of the code I use :

Ptr<cv::orb> descriptor_ORB;

Mat model = imread(filename); //string filename -> the name of an image file std::vector<keypoint> keypoints_model; cout << "size model : " << model.cols << "\t" << models.rows << endl; //display 123 and 62 -> successfully load Mat gray_model = model; cvtColor(gray_model, gray_model, COLOR_BGR2GRAY); // convert to grayscale as in examples descriptor_ORB -> detect (gray_model, keypoints_model); // compute ORB points of interest on grayscale image and put the points in the keypoints_model vector

This last line gives me an assertion failure : OpenCV Error : Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x +roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat, file Matrix.cpp, line 499

Is it normal ? It is likely that the detect function is unable to retrieve any points of interest...

To avoid early, termination I put the detect call in a try/catch statement.

Hi there, I'm trying to use ORB points of interest to try to retrieve an object into an image (compute points of interest; then associated descriptors and finally try to see if we can pair them and retrieve a transformation).

Here is a part of the code I use :

Ptr<cv::ORB> descriptor_ORB;

Mat model = imread(filename); //string filename -> the name of an image file
std::vector<keypoint> std::vector<KeyPoint> keypoints_model;
cout << "size model : " << model.cols << "\t" << models.rows << endl; //display 123 and 62 -> successfully load
Mat gray_model = model;
cvtColor(gray_model, gray_model, COLOR_BGR2GRAY); // convert to grayscale as in examples
descriptor_ORB -> detect (gray_model, keypoints_model); // compute ORB points of interest on grayscale image and put the points in the keypoints_model vector
vector

OpenCV Error : Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x +roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat, file Matrix.cpp, line 499
499

Hi there, I'm trying to use ORB points of interest to try to retrieve an object into an image (compute points of interest; then associated descriptors and finally try to see if we can pair them and retrieve a transformation).

Here is a part of the code I use :

Ptr<cv::ORB> descriptor_ORB;

Mat model = imread(filename); //string filename -> the name of an image file
std::vector<KeyPoint> keypoints_model;
cout << "size model : " << model.cols << "\t" << models.rows << endl; //display 123 and 62 -> successfully load
Mat gray_model = model;
cvtColor(gray_model, gray_model, COLOR_BGR2GRAY); // convert to grayscale as in examples
descriptor_ORB -> detect (gray_model, keypoints_model); // compute ORB points of interest on grayscale image and put the points in the keypoints_model vector

This last line gives me an assertion failure :

OpenCV Error : Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x +roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat, file Matrix.cpp, line 499

Is it normal ? It is likely that the detect function is unable to retrieve any points of interest...

To avoid early, termination I put the detect call in a try/catch statement.

Hi there, I'm trying to use ORB points of interest to try to retrieve an object into an image (compute points of interest; then associated descriptors and finally try to see if we can pair them and retrieve a transformation).

Here is a part of the code I use :

Ptr<cv::ORB> descriptor_ORB;
descriptor_ORB = cv::ORB::create(/*some values from a configuration file with atoi() and atof() to format values*/);

Mat model = imread(filename); //string filename -> the name of an image file
std::vector<KeyPoint> keypoints_model;
cout << "size model : " << model.cols << "\t" << models.rows << endl; //display 123 and 62 -> successfully load
Mat gray_model = model;
cvtColor(gray_model, gray_model, COLOR_BGR2GRAY); // convert to grayscale as in examples
descriptor_ORB -> detect (gray_model, keypoints_model); // compute ORB points of interest on grayscale image and put the points in the keypoints_model vector

This last line gives me an assertion failure :

OpenCV Error : Assertion failed (0 <= roi.x && 0 <= roi.width && roi.x +roi.width <= m.cols && 0 <= roi.y && 0 <= roi.height && roi.y + roi.height <= m.rows) in Mat, file Matrix.cpp, line 499

Is it normal ? It is likely that the detect function is unable to retrieve any points of interest...

To avoid early, termination I put the detect call in a try/catch statement.