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failing to build opencv with opengl Hello, I am following this script by JK Jung for installing opencv in Jetson Nano,

Thank you for the suggestion, but i am using the threads for these exact purposes, my input is 1920*1080 of 60 fps, and

multithreading in c++, capturing thread stops after some loops opencv 3.4.2 OS ubuntu 16.04 g++ 7.4.0 I am trying cap

ok, thank you.

if I use UMat , it is giving exception error if I use UMat , it is giving exception error terminate called after throwin

it is showing error terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(3.4.2) /home/u-16i/

but if I use UMat , it is giving exception error, any reason??` { Mat src_mat; UMat src_umat,resized,res; float inp

but if I use UMat , it is giving exception error, any reason??` { Mat src_mat; UMat src_umat,resized,res; fl

thanks, it is solved

virtual void cv::xphoto::GrayworldWB::setSaturationThreshold ( float val ) ;

without this function, the below code is having no issues, but when i am trying to get or set the saturation level it is giving the error:cannot call member function ‘virtual void cv::xphoto::GrayworldWB::setSaturationThreshold(float)’ without object, what is the correct way to call the function??

int main(int argc, const char **argv)

{

Mat src,resized,res;

src = imread("/home/u-16i/Pictures/wp/beach_flowers-wallpaper-1440x900.jpg");
if (src.empty())
{
    printf("Cannot read image file");
    return -1;
}
resize(src, resized, Size(), .49, 0.49, CV_INTER_AREA);
imshow("b4 white balance", resized);

Ptr<xphoto::GrayworldWB> wb =xphoto::createGrayworldWB();
xphoto::GrayworldWB::setSaturationThreshold(0.5);//error: cannot call member function ‘virtual void cv::xphoto::GrayworldWB::setSaturationThreshold(float)’ without object
wb->balanceWhite(resized, res);

    imshow("after white balance", res);

waitKey(0);
return 0;

}

unable to set saturation in grayworld white balancing of opencv_extra module virtual void cv::xphoto::GrayworldWB::setSa

and the same is valid for Mat also??

i would like to known that if i am doing some inplace operation in UMat, will that result into some intermediate outputs

opencv 3.4.2 user memory leak i am using opencv 3.4.2, i wanted to know that if in an infinite for loop i keep on captur

I am trying to create 1 CV_8UC3 image from 3 different CV_8UC1 images that I already have, i.e I am trying to allocate the different single channel images that I already have into a single 1 Multi-Dimensional Image

Mat image3c(width, height, CV_8UC3, **data**)

Is it either possible to-

1. give the data directly during the CV_8UC3 creation

2. std::vector<Mat> channels{ channelB, channelG, channelR }; // already have individual channels BGR in CV_8UC1 format merge(channels, image3c);

3. splitting the image3c Mat and then copying the predefined CV_8UC1 into the channels and then merging is possible, but trying best to avoid that

i used the following configuration

cmake -D CMAKE_BUILD_TYPE=RELEASE

-D CMAKE_INSTALL_PREFIX=/usr/local
-D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON
-D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib/modules

-D BUILD_OPENCV_ENABLE_NONFREE=ON
-D WITH_OPENCL=ON
-D WITH_TBB=OFF -D WITH_OPENMP=ON -D WITH_V4L=ON
-D WITH_QT=OFF
-D WITH_OPENGL=ON
-D BUILD_EXAMPLES=ON ..

it did installed successfully

and for compiling my code, I Used
g++ 3bm3d.cpp -o bm3d `pkg-config --cflags --libs opencv ` -lopencv_xphoto

but still I am getting this infamous error ->

terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(3.4.2) /home/odroid/Desktop/is2/opencv_contrib/modules/xphoto/src/bm3d_image_denoising.cpp:303: error: (-213:The function/feature is not implemented) This algorithm is patented and is excluded in this configuration;Set OPENCV_ENABLE_NONFREE CMake option and rebuild the library in function 'bm3dDenoising'

what else could I be possibly missing ??

yes , Indeed it worked. thanks !!

what is the correct data type mat.forEach<vec3b>(Operator()); if for 3-channel of type int I am usin

yes, I intend to do so.

no actually, I am compiling in arm.

/usr/bin/arm-linux-gnueabihf-ld: cannot find -lgflags_shared any lead ??@berak

-- Build files have been written to: /home/odroid/Desktop/is2/@_opencl/static/s.0.1.0/s.0.1.0/main odroid@odroid:~/Deskt

nope unfortunately it didn,t. odroid@odroid:~/Desktop/is2/@_opencl/static/s.0.1.0/s.0.1.0/main$ cmake . -- The C compil

Thank you Berak, somehow things got a bit simplified, if I try to specify everything explicitly, how will I come to kn

if I try to specify everything explicitly, how will I come to know all the dependencies I have, that I have to Link

after turning BUILD_SHARED_LIBS to OFF , there are too many undefined references previously during dynamic linking of op

it is based on one of my earlier post

after merging and extracting the BGR channel, error is coming after compilation, ILLEGAL OPERATION #include <opencv2

after merging and extracting the BGR channel, error is coming after compilation, ILLEGAL OPERATION #include <opencv2

I am working like this--> cv::merge(channels, added3); (1) added3.forEach<Pixel

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

Is it possible to create a BGR image from predefined 3 (1-channel) image I am trying to create 1 CV_8UC3 image from 3 di

by going through this link I got some information , and tested it. I am working on opencv v3.4.2 in Ubuntu 18.04.

If I am using cv::Point_<uchar> Pixel, its giving me a wrong output, but if uchar Pixel is being used the error is given at the compilation time only.

In member function 'void Operator::operator()(Pixel&, const int*) const': for_each.cpp:23:78: error: request for member 'x' in 'pixel', which is of non-class type 'Pixel {aka unsigned char}' rmat("[%d,%d]= %d \n",position[0],position[1],(uchar)pixel.x);

code

    #include <opencv2/opencv.hpp>
#include <stdio.h>
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/imgproc/imgproc.hpp"
#include <iostream>

using namespace std;
using namespace cv;
using std::cout;




typedef cv::Point_<uchar> Pixel;//wrong
//typedef uchar Pixel;  //  correct
//typedef Point3_<uint8_t> Pixel;



struct Operator {
    void operator ()(Pixel &pixel, const int * position) const 
    {           
        cout << format("[%d,%d]= %d \n",position[0],position[1],(uchar)pixel.x);      
    }
};

int main( int argc, char* argv[])
{    
    Mat mTest(Size(3, 2), CV_8UC1,Scalar(0));   
    randn(mTest,Scalar(125),Scalar(125));
    cout<<"I am using ----> cv::Point_<uchar> Pixel  \n";
    //cout<<"I am using ----> uchar Pixel \n";
    cout<< format (" Size : %d , %d \n\n",mTest.rows,mTest.cols);

//for(;;)
 {
    for (int Rows = 0; Rows < mTest.rows; Rows++)
    {
        for (int Cols = 0; Cols < mTest.cols; Cols++)
        {
            cout << format("[%d,%d]= %d \t",Rows,Cols,mTest.at<uchar>(Rows,Cols));
        }
        cout << "\n";
    }

    cout << "\n\n";
  }

//for(;;)
    mTest.forEach<Pixel>(Operator());

    waitKey();
    return 0;
}

Is the problem with the new opencv version ?? And can it be resolved??

is there any other way without copying the images, it is substantially increasing the overhead!!

Mat mask = data0 < data1; will this compare the per pixel intensity of image data0 & data1