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View ArticleUnable to start Universal Windows App when using cv::mat
Hi, I am new to OpenCV and Universal Windows Platform, and I am planning to write a Universal Windows Application using OpenCV libraries, so I searched google and found this guide:...
View ArticleRing Detection
hii, I"m trying to develop a software which will detect the number of rings in a conveyor belt and the dimension of that rings in cm, i'm new to image processing which will be the best method for...
View ArticlePre processing with tan trigs functions
So i added the tan trigs function to preprocess the image (probe set only, not training set). I pass my image to it: // Convert to grayscale cvtColor(contrast, gray, CV_BGR2GRAY); // first arg used to...
View Articlecircular object detection
i'm new to image processing. i wish to know if there are ways to increase the accuracy and detection rate of Hough Transform. i want to build a software which will detect rings in a surface in python....
View ArticleGiving error malloc(): memory corruption: and Segementation fault
Pose.h #ifndef POSE_H #define POSE_H #include "opencv2/objdetect/objdetect.hpp" #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include "opencv2/calib3d/calib3d.hpp"...
View ArticleicvCreateFileCapture_FFMPEG function doesn't return when access IP cameras
Hi everyone, We are encoutering problems when accessing multiple IP cameras (AXIS technology) at the same time. indeed, sometimes we see that the function icvCreateFileCapture_FFMPEG doesn't return....
View ArticleFeature Detector corrupts KeyPoint vector in OpenCV3.0 using MSVC 14:...
Hi there, I am using OpenCV 3.0 with the latest Visual C++ (version 14) and Win10. When calling the detect() method of a feature detector, detection works fine but if the KeyPoint vector goes out of...
View Articleaffine transformation between two triangles and copy region
I have two triangular regions, defined by their vertices. I am trying to find the transformation between them (aside from different scale from screen shot) so I can ultimately mask out a region using...
View Articlepython sample script error : AttributeError: 'module' object has no attribute...
Hi, posting the content below. Executed, as python facedetect.py in sample scripts of opencv version 3.1: face detection using haar cascades USAGE: facedetect.py [--cascade ] [--nested-cascade ] []...
View ArticleError in stereo_match.cpp example
When I start the stereo match example in 3.1.0, I get an exception: "OpenCV Error: Bad argument (undeclared position 0 requested) in getByIndex, file...
View ArticleStereo calibration sample doesn't work
I am having trouble trying to calibrate a pair of cameras by the [OpenCV sample][1]. I have my code compiled and launched successfully. The .xml file with the list of images is found, and the...
View ArticleSegmentation fault OpenCV cap.read() udp stream Python
I'm new to using OpenCV, and I'm trying to write a program to access a video stream on a UDP port. However, the code keeps giving a segmentation fault when I run it. The program is just intended to...
View ArticleHAAR Classifier Lighting
Hello, I am trying to detect faces using a webcam with openCV HAAR classifier. It works very well. However, in some places (ex. a colleague's office), the lighting conditions are intense and the face...
View Article"Train dataset for temp stage can not be filled. Branch training...
Hi anyone help me? "Train dataset for temp stage can not be filled. Branch training terminated.Cascade classifier can't be trained. Check the used training parameters." This error occurred. I used...
View ArticleNo communication between OpenCV and FlyCapture (Point Grey) in Linux 14.04
I am trying to use ArUco program (http://www.uco.es/investiga/grupos/ava/node/26) with a PontGrey Grasshopper 3. (USB 3.0). The problem is that when I run the program 'cpp-example-calibration' from...
View ArticleUsing OpenCV's pca write and read for saving PCA data
I am using OpenCV's function for PCA analysis. I want to save and read back the PCA structure using the provided functions. The PCA analysis part is OK, and the function serializes the object to the...
View ArticleOpenCV 2.4.13 imshow() slow on OS X 10.11.6 (Xcode/C++)
I'm trying to do a simple video playback using OpenCV on OS X 10.11.6, but the performance of imshow() is very bad. I'm getting around 1 fps out of the video, no matter the waitKey() parameter value....
View Articlewhat is the difference between opencv and opencl?
what is the difference between opencv and opencl? i'am new and i want to know whats the difference
View Articlefeatures2d - xfeatures2d - nonfree differences in OpenCV 3.1.0
Hi, I would like to know why keypoint detectors/feature descriptors are organized in this way. My first thought is that **features2d.hpp** are basic classes, **xfeatures2d.hpp** are extra classes and...
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