The cropped roi image is just tilted.I wanted it to be tilted to correct...
View ArticleHi,i want to give an output from opencv using visual studio to arduino.How...
Output from opencv is needed as output to arduino to make an external hardware work
View ArticleUnhandled exception at Microsoft C++ exception: cv::Exception at memory location
I have created the custom build the OpenCV with a current repo of OpenCV and opencv_contri_module When there is an assign of MATRIX OR VECTOR, this unhandled exception with memory allocation is...
View ArticleTLD tracking too slow
Hello, i am using the Tracking module in OpenCV to track several objects. I tried few algorithms (MIL, MEDIANFLOW, TLD, ...) and the TLD is looking like the most accurate one. But it is very slow...
View ArticleLinking CXX executables returns an error mentioning cannot find..
[ 50%] Linking CXX executable ---------- milestone2 /usr/bin/ld: cannot find -lQt5::Core /usr/bin/ld: cannot find -lQt5::Gui /usr/bin/ld: cannot find -lQt5::Widgets /usr/bin/ld: cannot find...
View ArticleHi i want to pass information to arduino.Which additional libraries should be...
i have a sample code .here i put the headers used #include "opencv2/objdetect/objdetect.hpp" #include "opencv2/highgui/highgui.hpp" #include "opencv2/imgproc/imgproc.hpp" #include #include "Tserial.h"...
View Articlecalculate the number of colors inside one image
can someone tell me how to identify different merged colors I have inside one image and calculate them? I am doing it for my project... but I am new to computer vision so any advices will be valuable:)
View Articlehi, i have to draw contour over a rectangle shape, but its drawiing contours...
since i have only one karma i cannot upload images the video is played on a white background with most of its area covered by the rectangle shape thing pls help me with a solution #include #include...
View ArticleCan we use this method to read images for training using FaceRecognizer class?
here is the code int train_ellen(vector& images) { Mat image=imread("ellen1.jpg", CV_LOAD_IMAGE_GRAYSCALE); if(image.empty) {images.push_back(image); labels.push_back(0); } else return 0;...
View ArticleOpenCV: Replace ilLoadImage with cv::imread
I'm using [`hessgpu`][1] for efficiently compute hessian-affine SIFT descriptors using GPUs. In this project, [Devil][2] is used for reading images: if `SiftGPU::RunSIFT(const char *imgpath)` is...
View Articlehow to calculate gradient in c++ using Opencv?
Dear guys I'm new in opencv, I'm looking for a simple method to find out how to calculate gradient of an image for sobel filter.
View ArticleFreeman chain code in OpenCV 3
In OpenCV 1 there used to be an option of cvFindContours (using CV_CHAIN_CODE) to obtain a contour from an image in Freeman chain code. However, I cannot find it in OpenCV 3. Has it been removed as...
View ArticleFisheye lens calibration using OpenCV returning zero valued distortion matrix
I am doing all the usual for calibrating a fisheye lens, I have 22 images that return `true` using the `findChessboardCorners()` function, I concatenate the points into a `vector>` which I use for...
View ArticleError while converting csv file into matrices form using CvMLData
I need to convert csv file into matrices.I wrote the following code. #include #include #include #include "opencv2/imgcodecs.hpp" #include #include #include #include #include #include #include #include...
View ArticleDifferent cv::Mat after calling the same method and arguments?
I have this code: vector blurs (par.numberOfScales+3, Mat()); vector sigmas(par.numberOfScales+3); //fill blurs and sigmas someway ... Mat high = hessianResponse(blurs[i+1], sigmas[i+1]*sigmas[i+1]);...
View ArticleParallelize chain of blurs
I have this code (revisited version of [this][1]): void HessianDetector::detectOctaveKeypoints(const Mat &firstLevel, ...) { vector blurs (par.numberOfScales+3, Mat()); blurs[1] = firstLevel; for...
View ArticleDrawing a line for moving object
I have real time stream and I want to just draw a line that shows the path of moving object. I am using Opencv 3.1 with C++
View ArticleDetecting abundant bag using opencv
I want to detect abundant bag in a video surveillance single camera view using opencv. I had already done some research on method and algos for same and what only , I found is :...
View ArticleCompare functions after normalize
Hey, guys! I'm doing a video reading and for each frame I need to calculate the average standard deviation and the variance. (I did these calculations without problems using the openCv method). Now,...
View ArticleOpencv select timeout at high resolutions
Hi all. I have an A4Tech pk-336e webcam attached with my BeagleBone and i am using OpenCV to capture images from BeagleBone Black. Issue is when i capture image at 320x240 resolution i get a perfect...
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