How choose best parameter for SVM?
Hi, i try to develop a multiclass (n>2) classifier with svm. I saw that opencv implement one vs all for this problem. But i have a some problem with the parameter? How can choose best parameter for...
View ArticleDual TVL1 Optical Flow differences v2.4.11 to v3.1
I see differences in the Dual TVL1 optical flow algorithm between v2.4.11 and v.3.1. I was wondering if anyone has noticed the same problem, and had an explanation. I've slightly modified the example...
View ArticleVideoCapture::read frame drops with dark pixels.
Hello, I have a strange performance problem with a standard and very simple webcam capture prototype. I am using openCV inside Unreal engine (if that changes anything). I `read()` a frame from my...
View ArticleMultiple opencv 3 & IPP build issues
This post started out as a question, but morphed into a notification of multiple problems I had building opencv 3 with IPP "out of the box", and to provide a workaround, which works for me at least....
View ArticleContours sorting.
Are contours returned by findContours() sorted somehow? It seems that they aren't. In fact, I've got 1D std::vector of centroids of contours. (Got with the help of moments()) I need to sort these...
View ArticleTraining cascade classifier: Can not get new positive sample
I'm trying to create custom haar classifier. I have opencv compiled on my machine. I have 435 positive images and 4437 negatives (yeah, I know, probably waaaay to much), all of them grayscaled. Now,...
View ArticleWhere I start to develop Android OMR app?
 A just wanna to detect answer mark thought opencv. Looked at many samples. But most of them about hought circle, face detection etc. I look at this...
View ArticleUse Case Detection for a Computer Vision Data Structure
I am currently solving a computer vision/image processing riddle, where my result is an array with a specific size, with entries being 1 or multiples of 2 up to a value of 128. Basically, I have an...
View ArticleRaspberri pi 2 + B and OpenVC
Hi! I'm installing opencv following this instructions http://www.pyimagesearch.com/2015/02/23/install-opencv-and-python-on-your-raspberry-pi-2-and-b/ this is the most popular web page, and ranks first....
View ArticleOpenCV integration with Qt
**Version: opencv-3.1.0 Language : C++** Hello everyone, I have been having a reoccurring problem that is really slowing me down.. I'm new to C++ and really want to learn and get into openCV . I have...
View ArticleCan not compile opencv3 with cuda7.5
hi there I am trying to compile opencv3 (latest) with CUDA 7.5 but it gives the following error [ 86%] Built target opencv_python2 [ 86%] Built target opencv_python3 [ 86%] Building CXX object...
View ArticleProject Image Plane on Object Plane
I am trying to find the coördinates of a point on my image (Xpixel, Ypixel) on a object plane... like the reverse of (cv::Projectpoints) My camera is already calibrated , so i know the : 1. intrinsic...
View ArticleHow to use opencl module in opencv for android?
hi,everyone, I want to use opencl module in opencv in my android application. I use native C++ and the version of opencv is 3.1.0. I first run the following code in win32 console application on my...
View ArticleHow to set up opencl in opencv for android
hi,everyone, I want to use opencl module in opencv in my android application. I use native C++ and the version of opencv is 3.1.0. I first run the following code in win32 console application on my...
View ArticlePhoto.createTonemap in opencv4android
In android I have the byte[] from the camera. How to I use Photo.createTonemap to process the data? The Tonemap.process method accepts Mat object. sourceFrame = new Mat(height + (height / 2), width,...
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The Dyson Vacuum: Is Bagless Far better?
I am not a Dyson seller. This is a genuine evaluation.In the starting all vacuums ended up bagless. All vacuums only utilised a cloth bag to enclose the fibres and dirt and pet hair.They leaked grime...
View ArticleWeight-loss Is Not Difficult To Obtain Help With
While you are attempting to accomplish weight reduction, you ought to keep in mind that psychological nicely-becoming, together with several helpful tips, will give you the outcome you want. There is...
View ArticleHow can extract ROI from depth image?
I can detect ROI in depth image on opencv 3.1? Can you help?
View ArticleGuide on Seeking British Gas Contact Number
British Gas isn't just the greatest supplier of energy inside the United Kingdom, nevertheless it can be among the biggest electrical providers on earth. In addition to this, they also provide gas to...
View Articleopencv_world310d.dll. Cannot find or open the PDB file
I am using W10 64 bit OS. I have installed opencv3.1.0 to my root directory C:. I am having issues with VS15 seeing the dll file. When I try to debug I get the error: Cannot find or open the PDB file....
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