Compile Opencv 3 with visual studio 9
Due to some circumstances I need to use an older version of visual studio, I tried to use the [this](http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html) guide and...
View ArticleUndefined refrence to cv::fastFree(void*) , cv::Mat::deallocate() ,...
Hi I am using opencv-3.0.0 in ubuntu and with axis-mips compiler(a specific compiler for axis ip camera). this compiler uses makefile and I try to link opencv library properly. when I define a Mat...
View ArticleError when Capturing RTSP IP Camera
Hi all ! I am working to connect my IP Camera using openCV 2.4.11 and VS 2012. My IP Camera supports H.264 video compression. When I program it using openCV, it can be connected and I can capture...
View ArticleAveraging Moment and arch length value for Binary image
Hello, I have an image which have multiple white area after the thresholding process. Can the average of the moment could be calculated? Can it be done to arc length too? Another thing, is it true...
View ArticleError occurred during running time. cvHoughLines2
I want to find lines using cvHoughLines2 function. but when I run the program there are some error like below. root@nvidia:~/sampleCode/4_captureOpenCV# ./captureOpenCV -vt 10sad 1. Create NvMedia...
View ArticleHow to filter a long and thin rectangle in a grayscale image?
Hi, I have grayscale images in which I need to filter a long and thin rectangle. My images are looking like this: [image](http://www.bilder-upload.eu/show.php?file=31c480-1438763261.jpg "title")...
View ArticleProblems capturing image from LI-USB30-V024STEREO Leopard Imaging stereo board
Hi there, I have a LI-USB30-V024STEREO board which interlaces the grayscale image into a single image. I am reading the images from the two cameras and displaying it into several windows, including the...
View ArticleCan thresholding only be applied to a grayscale image?
I have read many articles like [this](http://docs.opencv.org/master/d7/d4d/tutorial_py_thresholding.html) which suggest that you can only apply a threshold to a grayscale picture. I have also seen...
View ArticleAny way to read video frames other than VideoCapture?
Essentially, i need a way to capture video frames using python (or in my particular case, raspicam camera.start_recording) and then being able to process the frames using openCV. Rather than opening...
View Articleopencv much slower in multithreading
Im writting a console application that uses open cv and multithreading. Im testing it in a 4 native core CPU (8 with HT enabled) with 12 GB of RAM. Each thread has to execute a function that uses...
View ArticleErrors after wrong installation of opencv
Hi , i'm trying to run an example of face detection using opencv , C++ , and QT from here : [https://github.com/benhoff/opencv](https://github.com/benhoff/opencv) when running make i get the following...
View ArticleSVM training much slower in version 3.0.0
Due to some [problems](http://answers.opencv.org/question/67137/svm-error-when-input-data-size-is-too-large-calc_non_rbf_base/) with version 2.4.12, I've been testing SVM training with OpenCV 3.0.0,...
View ArticleImage resizing - bicubic downsampling
Dear OpenCV users, I am **down**sampling an image by a factor of 5. I am wondering what - INTER_CUBIC and - INTER_LINEAR exactly do in this case? Different from upsampling, for downsampling one does...
View Articlefile head comment style
Just curious: Why the first comment of a source code file has the style `/*M ... M*/`? Why 'M' is used?
View ArticleEssential matrix 6x3 (expecting 3x3)
After calling [findEssentialMat()](http://docs.opencv.org/3.0-rc1/d9/d0c/group__calib3d.html#ga0c86f6478f36d5be6e450751bbf4fec0) function: essMatrix = findEssentialMat( points1, points2, 1.0, Point2d(...
View ArticleHow should i install openCV to integrate it with ROS
I am using ubuntu 14.04 and ROS indigo. Where should clone the openCV folder to build and install. Should i install in /opt because my ROS is installed in /opt. Is there any extra care should be taken...
View ArticleCannot save video??
I don't know what it is. I keep trying to simply save video which is streamed via my webcam to a file called output.avi I have looked at the documentation, I have looked at questions online, it seems...
View ArticleKNN findNearest() return always 0.0 openCV4Android 3.0.0
I'm writting apk, which recognise hand sign. It's my function to train KNearest model. I'm using 5 images 200x200 px. public void train(){ Mat trainData = new Mat(0, sizex * sizey, CvType.CV_32FC1);...
View ArticleHow to speed up seamlessClone? (incredibly slow)
Hi, I am using seamlessClone to integrate a logo into a video and it is incredibly slow. Actually creating a video with 1000 frames with a resolution of 1280 x 800 takes 30 seconds. While using...
View ArticleSubtracting FFT2(A) to FFT2(B) can make a just object image?
Image_A have an Object and Image_B have Ony Background which same as Image_A. Subtracting FFT2(A) to FFT2(B) and inverse Can make a just object image? Removing the background is possible with this...
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