Track bar performance
Hello I´m having problems with the behavior of the track bar. I had try to use in different programs and examples and have the same problem that is when I try to drag one of the bars it doesn´t do...
View ArticleImage Stitching parameters seem that there is no one can explain it, please...
Hello, I searched over all the **websites** and **OpenCV documentation** to understand the Image stitching parameters, but it seems that there is no one can explain it !!! There are also many users...
View ArticleSeparate RGB channels in 3 Mat variables
Hello, I am try to separate the RGB values in 3 Mat variables in order to deal with them separately. I would like to use a simple code to understand the data structure of Mat for images. The code I am...
View ArticleHow to flip a camera calibration?
Hi, does anyone know if it is possible to vertically flip intrinsic camera calibration settings so that I can use inverted images from an already calibrated camera? To be precise, I have intrinsically...
View ArticleRead video with VideoCapture in OpenCV 2.4.11
Hi, I am trying to read a video: #include #include int main() { cv::VideoCapture in("mpi_sintel_final_alley_1.avi"); cv::Mat frame; assert(in.isOpened()); assert(in.read(frame)); } The second...
View ArticleDirectX interop in 3.0 (Nvidia card)
I am trying to run the **d3d11_interop** example, but it crashes on `initializeContextFromD3D11Device`. When trying to debug this function, I can see that `clGetPlatformIDs` returns two IDs (as...
View ArticleHow to crop and rotate images?
I need to process series of scans through crop and rotate. At first I have to specify that scans come out straightened neither vertically nor horizontally. I might get straightened scans, too. It...
View ArticleCould not find OpenCV Sample - face-detection.apk! (not build opencv sample...
hi my friends,i use opencv library for android,i run other sample opencv successfully but for Sample - face-detection this have a message "Could not find OpenCV Sample - face-detection.apk! "; i seted...
View Article32-bit and 64-bit dlls
We provide a set of libraries to develop specialized applications for optics. I am using OpenCV for some image processing functions. The way OpenCV is built, dll names are the same for both 32-bit and...
View ArticleDevice GeForce GTX 980 is NOT compatible with current GPU module build
Hi all, I had compiled opencv 2.4.11 with CUDA 7 and Cublas, there was no error at compile time. But, I'm still not understand why no tests are available when running opencv_test_gpu: [----------] [...
View ArticleThread-creation with parallel_for
Hey! I'm trying to speed up an application and want to see if parallel_for can help me. As my first step, I wrote a fancy programm that finds the maximum value per row in an image. This looks like...
View ArticleProblems to compile opencv library with support c++11 in Android NDK
down vote favorite all I have Problems to compile opencv library with support c++11 in Android NDK, I have a project configure with opencv 2.4.11 and i need to use some classes that support c++11, but...
View ArticleERROR OPENCV 2.4.11 WITH QT 5.5 WINDOWS 8 X64
Dear friends I'm using Windows 8.1 X64, Qt 5.5 and OpenCV 2.4.11, but compile the project into 32 bits. I wonder why this happens, and if anyone has any solutions. I thank the understanding of all ......
View ArticlefindEssentialMat() pose estimation: wrong translation vector in some cases
I am currently using epipolar geometry based pose estimation for estimating pose of one camera w.r.t another, with non-zero baseline between the cameras. I am using the five-point algorithm...
View ArticleOpenCV4Android - Can you edit contours?
So I've found contours but because of a lack on contrast in my image some of the contours I'm finding aren't what I'm expecting. So is there any way of editing a found contour? I'm looking for a dot...
View Articlecomputing average image of N webcam images crashes sometimes
Hey guys, I wanted to write a program which takes N live webcam images, calculates an averaged-image out of it and saves the average image as a jpg. I'm passing the filename and the number N of images...
View ArticleVS++ OpenCV + arduino + led
Hi, Im new on the forum and i`m begin to science with OpenCV and VS++. I heve one request. I need basic program to start science. I need smart code for VS++ and arduino and i thing You can help me....
View ArticleHOGDescriptor::compute parameters
My usecase is simple. Given an image I want to find hog descriptors of **a particular** window (that is I just want to compute HOG features in a window). It seems that I should use...
View ArticleInstalling OpenCV Manager 3.0.0 on Android (phone + emulator)
Hi, I'm new to open cv and I'm trying to install the open-cv 15 puzzle app on my android emulator, using android studio. I've read online from other sites that the current cv manager isn't available...
View Articleneed help hand tracking mouse
hello guys, I'm working on hand recognition method with finger counting and decide to add a trackbar for inputing the value that determine how the mouse action react when the hand shown the value that...
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