How to properly set up VideoCapture Tags
I am having trouble setting up opencv in C++ to manually change these properties, but every time I try I get the warning "An unhandled exception of type 'System.AccessViolationException' occurred in...
View ArticleObtain Camera Pose and camera real world position using SolvePnP C++
I am trying to measure the pose of a camera and I have done the following. 1. Mark world 3-D(Assuming z=0, since it is flat) points on corners of a square on a flat surface and assume a world...
View Articlehow to use unicode with knearest::train for arabic character
I want to do something like that but when I do that the result is ASCII code, not Unicode cv::Mat_ trainFeatures(40, 1); trainFeatures << 'ب', 'ت', 'Ø«', 'ج', 'Ø', 'Ø®', 'د', 'Ø°', 'ر', 'ز', 'س',...
View ArticleFailed to open goturn.prototxt
I am using OpenCV 3.3.0 with C++ on Ubuntu 14.04. While trying to use GOTURN tracker, I am getting an error "Can't open 'goturn.prototxt' file in ReadProtoFromTextFile". Please note that I have done...
View ArticleIssues with OpenCV train_HOG c++ sample code?
I am trying to train a HOG+SVM on the INRIA dataset using the OpenCV sample code [train_HOG.cpp](https://github.com/opencv/opencv/blob/master/samples/cpp/train_HOG.cpp). Firstly, I am confused why...
View ArticleFind the the minimum value from the depth data
Dear All, I want to find the minimum value and its position from the depth data. As Depth image contain some 0 values. I have to ignore 0 values and search the minimum value. Can you please suggest...
View ArticleFeature Matching; Detection of multiple Object Instances
Hello, I would like to implement a feature-matching-approach for multiple object detection. In related questions...
View Articlecolour detection and cam output at the same time
Hello together, i am working on an small projekt where i need to show the Image of 2 cams and at the same time i want to show the detected colour in the console i am programming in c++ with opencv...
View ArticleCompiling from source OpenCV 3.3 : Failed
There is a new version released few days ago of OpenCV 3.3. I'm trying to compiling it but I didn't succeed. I downloaded the OpenCV from source and I created a build folder in it and launch cmake:...
View Articleraspberry pi 3 video play c++
Im currently working on video processing project on raspberry pi 3 using OpenCV libraries. As a guide im reading opencv2 computer vision application programming cookbook. If you are familiar with this...
View ArticleConversion of depth data into the point cloud data with opencv
Hi All, I am working depth data which was taken from stereo camera. It is in the form of short values. I want to covert depth data into point cloud data. If anyone know any research papers or method...
View ArticleHow to handle waitKey() during threading
I am trying to mess around with multi-threading and OpenCV so I wrote the following program. void performSearch(Mat& original, Mat& grey, Mat& result) { // do stuff waitKey(); } int main()...
View ArticleMachine learning approach for extraction of arm.
Dear All, Currently, I am working on arm detection with the help of machine learning approach in opencv with c++. I am using rgb as well as depth data for it. As I am new in machine learning filed. If...
View ArticleTime to contact
Hey, I'm struggling wrapping my brain around how to estimating time to contact using motion vectors ( or maybe expansion cues?) from optical flow. I have tried reading some papers on the topics, but so...
View ArticleUnhandled exception in Release version of Feature Detection and Feature...
Hello folks, I have OpenCV 3.2.0 installed on VS2017 CE. I built and compiled the tutorials on Feature Detection and Feature Matching with FLANN using code from...
View ArticlecvWaitKey is not generating key codes for naviagation keys
I have involved with opencv key function ie cvWaitKey(0).whenever i press the "r" key the point on opencv image window is moving right direction, for "L" towards left ,for "u" upward direction as...
View ArticleDewrapping results not expected result
I'm trying to iterate through end points of lines, build segments between them and finally dewarp the distortion. I should imagine, that all those "mini"-segments are small images (somthing about...
View Articlebad results with findCirclesGrid
Hello everybody, I'm trying to write a program for a camera-calibration using the 4x11 asymmetric circle grid. I use a camera with 3840x2750 pixels. Although the pattern is recognized by the program...
View ArticleI want to perform object recognition using images and videos but i dont know...
I am recently working on object detection using traincascade in opencv which i have learned a lot and prepared an .xml file to detect tomato but I have to perform object recognition . Please suggest...
View ArticleDetection of hand from the depth data.
Hi All, I am working on human skeleton extraction from depth data. I did some research on machine learning approach but it is difficult to apply machine learning to find out whole body skeleton. So, I...
View ArticleWhat's the best method for tracking identical objects?
Hi all, I'm sorry that my question is so wide, but I will try to explain in detail what is my problem. So, I just wrote a program, that checks whether two balls of different colors are on the collision...
View ArticleWhy am I Getting distorted images after sending them from C# to OpenCV in C++?
I created a C DLL out of my C++ class which uses OpenCV for image manipulations and want to use this dll in my C# application. Currently, this is how I have implemented it : #ifdef CDLL2_EXPORTS...
View ArticleHow to read .mat file in opencv c++
Hi all, I have file in .mat format. I want to read this file in opencv with c++. If anyone idea, let me know. Thanks
View ArticleOpenCV V3.3 64bit Video Capture Memory Leak
Dear community, with this simple peace of code a get a memory leak using opencv v3.3 64bit with Visual Studio 2015. int i = 0; while (i++ < 50) { VideoCapture test; test = VideoCapture(0); } Can...
View ArticleIOS opencv memory rad failed for 0x0
when program go to a certain line, it goes to `error: memory read failed for 0x0` stop at queue: ` com.apple.avfoundation.videodataoutput.bufferqueue(serial) thread 4 0 0x00000000`...
View ArticleOPENCV doesn't show images for feature detection
I am using this tutorial: http://docs.opencv.org/3.0-beta/doc/tutorials/features2d/feature_detection/feature_detection.html It built successfully but I don't see any images. Can anyone help ... Thanks
View ArticleHow to play a video in opencv using C++?
Please tell me how a video file is played in Opencv. I tried using cvCapture. here is the following code I used. it is displaying 'video not opened'. int main(int argc, char* argv[]) { CvCapture*...
View ArticleConversion of channel 3 to channel 1
Hi All, I have depth data stream. I am getting the data type of of video stream is 16 which is CV_8UC3. How to convert this channel 3 to channel 1? and also, This video stream contains only the...
View ArticleUnable to play a video in opencv3
Here is my new code. int main(void) { cv::VideoCapture capVideo; cv::Mat imgFrame; capVideo.open("C:\\Users\\sbv\\Documents\\MyVideo.avi"); if (!capVideo.isOpened()) { std::cout << "\nerror...
View ArticleChanging Exposure with Windows Forms
Hello, Every time I run this bit of code meant to change the value of the exposure with a trackbar and I am getting an error saying System Access Violation, attempted to read or write to protected...
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