Does using cv2.VideoCapture() destroy imaging device at device manager??
 My dell 5110 just lost webcam. imaging device has gone missing from device manager!!!!!!
View Articlevideo stream resolution UE4
I have implemented a simple OpenCV in Unreal Engine library to stream webcam video into the engine, but I am having trouble getting a higher resolution out of OpenCV. I am aware of the...
View ArticleDifference between submat and Rect?
How does submat perform in comparison to rect? In what way can we use them differently?
View ArticleOpenCV-git with OpenCL ?
At the very beginning, my working environment:> jiapei:~$ nvidia-smi Tue Sep 27> 17:22:50 2016 > +-----------------------------------------------------------------------------+ | NVIDIA-SMI...
View ArticleDNN (SqueezeNet) OpenCV Error: Assertion failed in cv::Mat::reshape
Hi, Am trying to deploy a trained Caffe model from DIGITS with OpenCV 3.1.0. I have attempted the [sample...
View ArticleHow to convert SFML image to OpenCV Mat in c++?
Below code is used to convert an OpenCV Mat image into SFML image. How to convert SFML image back to Mat image? cv::Mat frameBGR, frameBGRA; sf::Image image; cv::cvtColor(frameBGR,frameRGBA,...
View Articleerrors on running FAST algorithm on corner detection
Could any one provide a example python script to test FAST algorithm on corner detection? When I run below example python script from opencv-python tutorial, I get a error "TypeError: Required...
View Articlememory deallocation
OpenCV matrices can be declared in various ways. I am looking to declare openCV matrices in a main class and then populate them in member functions. My question : I believe that openCV matrices will...
View ArticleMat::clone() issues
Hello, I am using a method for thinning an image. The method is beeing executed by a single thread. void applyThreadedThinning(Mat* input) { Mat output = input->clone(); ..... } I use MSVC 2015...
View ArticleOpencv 2.4 wiki error ?
Hey, I found something weird on the opencv 2.4 documentation. http://docs.opencv.org/2.4/doc/tutorials/imgproc/erosion_dilatation/erosion_dilatation.html It looks like dilate and erode title have been...
View ArticleDetection of contours intersections
I have two contour images and I would like to find the contours intersection. So far I've succesfully used the *logical and* operation, unfortunately I've fallen into this case: ![image...
View ArticleOpenCV Android absdiff not working
Hello, I want to create a motion detector in a OpenCV Android app. First I accumulate the background with this class: private Mat mRgba; private Mat mGray; private Mat mBackground; private Mat...
View Articlecv::OutOfMemoryError while calculating (surf)descriptors
I'm trying to set up an object recognition system with 12x30 images with 1280x1024 pixels. I'm using Visual Studio 2013, Windows 8.1 x64 with 8GB RAM and compile as x86. I get the following error...
View ArticleMalloc Error while pushing back Keypoint Vector
I got an Malloc Error while calculating a Descriptor for feature Candidates that I find with FAST. After the Detection I try to calculate the Descriptor with parts from SIFT. The Code I am using is...
View ArticleVideiwriter create an avi with broken ot missing AVI Index
I'm using videoWriter to create a video. I'm using VS 2012 in windows. The idea of the code is to : 1. create a VideoWriter object 2. open a pre-existent image (a set of them inside a for loop) 3. add...
View ArticleProblems installing Opencv on Mac
Hello! I am trying to install Opencv for the first time. When I run this command line: python opencv/platforms/ios/build_framework.py ios Comes our this error: Executing: ['cmake', '-GXcode',...
View ArticleHow should I approach preparation of training data/cascade training with one...
I have to detect one object which exists in a blue and red state. Should I use separate positive samples and do separate cascade training for each object, or can one cascade classifier be used to...
View ArticleHow to read video frames from 4 channels EasyCap (Video grabber device)?
how to get a specific channel from the device captured.. Opencv library doesn't support such a choise
View Articleopencv 3.1 ffmpeg should I do shared enable
SO I'm installing opencv 3.1 for c++ use on Ubuntu 16.04 on Rpi 3 opencv with gcc 4.9. In some tutorials they recommend to build ffmpeg from source with shared enable and disable static flag. In others...
View ArticleAny plans to implement the face detection algorithm proposed by [Zhu and...
It's considered the state of the art algorithm for face detection. Link to the paper: http://www.ics.uci.edu/~xzhu/paper/face-cvpr12.pdf
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