How to use HOG Descriptor ?
I type `cv::HOGDescriptor hog;` but opencv tells me namespace cv has no member HOGDescriptor. How do I know what files I need to include to use HOG ? I am using opencv 3.1
View Article[OpenCV]How to detect and connect camera automatically
How can i detect and connect camera automatically?
View ArticleSVM Training Data with Bag-of-Word
Hi, I've a question with training an SVM multiclass with bag of word model. I have 50 video of training and each video is represented by a matrix of words. Now i have a vector that contains all...
View ArticleOpenCV 3.1 Android compatibility
I have an application that uses OpenCV 3.1, and i'm having an issue when trying to download the app from Play Store, it isn't compatible with a device. I've found that this version of OpenCV is what...
View ArticleWhat algorithms suits best for Image detection of known Image databases when...
I am trying to implement the SDK for Augmented reality. Consider an example of Augmented reality book. I know the book that is used for that particular AR application.So now I can develop images from...
View ArticleHow do I start developing with OpenCV3.1 and opencv_contrib in Visual Studio?
I want to be able to develop my openCV code in VS, my version is Professional 2015, Version 14.0.24720.00 Update 1. I had intially just downloaded the OpenCV 3.1 executable and then linked my projects...
View ArticleDensity function of Dirichlet distribution
Dear community Dirichlet distributions is used as a metric to guess the similarity between image, i read that is this paper DOI: 10.1049/ip-vis:20045192 ![image...
View ArticleVideocapture grab function does not return (blocking call) when IP camera is...
The problem which I am facing is that the grab function of Videocapture object **gets stuck** when my IP cam is disconnected. Ideally, the grab() function or the isOpened() function should return false...
View ArticleIn OpenCV 3.1 will Mat::dot() use the gpu if it is available?
I am not too sure when I should expect the transparent API to be able to use the GPU and when not. Will...
View Articleface.predict error in cv3 python 2.7
The following code works in cv2, but neither predict line works in cv3: recognizer = cv2.face.createLBPHFaceRecognizer(radius=2, neighbors=16, grid_x=3, grid_y=3) (prediction, conf) =...
View Articleopencv 3.00 build error
Hello all, I am trying to install OpenCV 3.00 on my OS X. After running CMAKE, I went into my build directory and did 'make all'. I ran across the following error....
View Articlehow to print detected marked circle in OMR sheet?
I am working on OMR and i am detecting circle who are selected by student. Now i am not getting how to get the selected numbered circle which marked by student.I am looking solution/idea for opencv...
View ArticleHow do I remove image background in Java using OpenCV?
I want to remove background from a single image. But i cant remove background using BackgroundSubtractorMOG2.
View ArticleHow to pass 3D array to Mat ?
I have a 3d array float*** gradientStrengths = new float**[cells_in_y_dir]; After filling it up, how do I pass it to an opencv mat ? cv::Mat gradientStrengths_mat = gradientStrengths; Also, how do I...
View ArticleConfidence value for svm model
I am using SVM algorithm to recognize Facial Expression using opencv library. I want to get prediction confidence of my test image but the syntax of predict is something like **float response =...
View ArticleHow to add module from opencv 3 to opencv 2
Hello, More precisely I want to add ArUco library support in OpenCV 2.4.13. And I have no idea how to do this. I saw this post http://answers.opencv.org/question/98063/aruco-opencv-2410/ Next advice...
View ArticleHow to visualize the 32 dimension HOG from DPM?
Hello, I'm relatively new to programming in OpenCV and to the image processing gig so please bear with me. I'm working on my master thesis and I'm trying to find a way to visualize the HOG that I get...
View ArticleProgram crashes when exiting function
I have this function that **crashes on exit** and I cant seem to figure out why. I hope it isn't a problem with the opencv or visual studio version because I have many other code in the program thats...
View Articlevs studio debug mode gives me problem at glob
I have this problem in debug mode of visual studio that I have been unable to solve. This line cv::glob(imageL_folder, imageL_filenames); gives me an error Exception thrown at 0x00007FF9A4CF87F8...
View ArticleHow does the cv2.VideoCapture class work with gstreamer pipelines?
Today I found out that you can use a gstreamer pipeline-string in the constructor of the VideoCapture class (see http://stackoverflow.com/a/23795492), like this: cv2.VideoCapture("autovideosrc !...
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