OpenCV + Darknet - Error when initializing darknet
Hi! I'm an university student and for my thesis work I have to perform object detection using YOLO. I read the related paper and I completed all of the command line examples located at...
View ArticleUeye usb 1540LE monocrome live streaming with opencv 3
Hi there, i have been trying to start ueye usb 1540 LE monochrome camera using opencv on ubuntu 14.04. program runs and camera is initialised also, memory is also allocated, but my window is showing...
View ArticleTraining cascade for detecting arrow signs
I'm working on a simple navigation problem, for which I need to detect arrow signs and follow the arrow right or left. I can define the arrow shape, and am using this black arrow on white background....
View ArticleSkeletonization of the image
Hey, im trying to convert the below image into skeleton using opencv.  By using ---------------------------------------- size = np.size(crop) skel =...
View ArticleSample code in opencv java for finding contour properties
Hi, I am doing a project using OpenCV Java. I want to make use of methods for finding contour properties. As I am not an expert in OpenCV or Java, it would be great if someone could provide a sample...
View ArticleHow should a tensorflow model be saved so that it can be loaded in opencv3.3.1
Hi, I am using Tensorflow to train a neural network ( The neural network doesn't contain any variables ). This is my neural network graph in Tensorflow. X = tf.placeholder(tf.float32,...
View ArticlePerformance of findCirclesGrid on larger grids
I have found that findCirclesGrid takes a long time (on the order of minutes) on reasonably large grids such as 23x18, contained in 4 MP images. I'm using default parameters, and the images are...
View ArticleHow to improve back projection?
I tried toto extract background of an image using [Histogram Backprojection](https://docs.opencv.org/3.3.1/dc/df6/tutorial_py_histogram_backprojection.html) as seen in the mentioned example not able...
View ArticleDynamic Thresholding
Hi, I have a question about Dynamic Thresholding. I know that Halcon software uses dynamic thresholding for image processing. I was wondering if there's an equivalent for that in OpenCV. This is what...
View ArticleI am with difficulties in building the openCV.js in MAC OS
I follow the steps in the tutorial at the openCV website and I have the following error: bash-3.2# python platforms/js/build_js.py build_js...
View Article(DNN) different results between version 3.3.0 and 3.3.1
System information (version) OpenCV => 3.3.0/3.3.1 Operating System / Platform => Windows 10 64 Bit Compiler => Visual Studio 2015 Detailed description I have a network that works fine in...
View ArticleBuilding calib3d in OpenCV.js
Hello, I would like to use SolvePnP in javascript, But currently i cant make it work :( im using 3.3.1 and following the intruction to build openCV.js from [the official...
View ArticleLinking error to -lopencv_core
Hello, I downloaded a code recently from a Github repo for doing non-rigid 3D object reconstruction from videos. The code has many dependencies on other libraries, among which is the OpenCV library....
View ArticleEnergy computation of DCT of image +
I am interested to know Energy of low and high frequency component of dct (discrete cosine transform) of image. Here, i found [energy computation of...
View Articlebuild master branch on debian9 with cuda9
Hello I've tried to build opencv3 master with gcc6 cuda9 but i always get an error regarding with cuda, compilation without cuda works fine,. I as well get the warnings cc1plus: warning:...
View Articlecan anybody give me a link of tutorials of using opencv with android studio?
I wanna use opencv with android studio
View ArticleProblem in loading the image..
import numpy as np import cv2 img = cv2.imread("mud.jpeg",cv2.IMREAD_COLOR) cv2.imshow("bhatnagar",img) cv2.waitKey(5) This is the error I am getting: I have even tried by giving the path of the image...
View Articleusing StereoBM in java on Android -> some results
Hello is someone could give me an example to show how to use org.opencv.calib3d.StereoBM in Java (on Android in my case) ? I only found examples in C++ and Python on the web... EDIT2 : I tried to...
View ArticleOpenCV SVM performance poor compared to matlab ensemble
Hello, I have been training a svm classifier for a 2 class forgery detection problem with feature size of 18157 and number of samples = 6000. The svm type is c_svc with a rbf kernel. The C and Gamma...
View ArticleMATLAB imwarp vs C++ warpAffine
I am trying to convert following MATLAB code into c++ code by Opencv library **Matlab Code:** scale_x = 0.99951; scale_y = 0.99951; RsrcImg= imref2d(size(im1)); T=[scale_x 0 0;0 scale_y 0;0 0 1];...
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