jsxyhelu's profile - activity

hi,guys learningOpencv3 chapter10 question15 ,says

15 Use cv::filter2D() to create a filter that detects only 60-degree lines in an image. Display the results on a sufficiently interesting image scene.

I know how to detects 45-degree lines ,as

Mat srcLines(100,100,CV_8UC1,Scalar::all(0));//draw lines
line(srcLines,Point(0,0),Point(100,100),Scalar(255),1);
line(srcLines,Point(50,50),Point(100,0),Scalar(255),1);//45 - degree
line(srcLines,Point(0,100),Point(50,0),Scalar(255),1);//60 - degree
Mat srcH(3,3,CV_8UC1,Scalar::all(0));

srcH.at<char>(0,0) = 255;
srcH.at<char>(1,1) = 255;
srcH.at<char>(2,2) = 255;

filter2D(srcLines,dst,srcLines.depth(),srcH);

but ,how to create a 60-degree kenrel? any help will be welcomed. thanks

NextCFU sounds good,thanks you

OpenCFU has achieved great results, but its documentation is relatively lacking except for a review paper. I wonder if y

Opencv multiple bubble detection in a image Hey there, I writing a code for bubble detection, This is the code i'm using

I have tried HoughCircles,but it not work well....

Opencv multiple bubble detection in a image Hey there, I writing a code for bubble detection, This is the code i'm using

I hope to provide more pictures to facilitate the creation of data sets and targeted experiments.

Inevitably, we need to consider the characteristics of "circle" and try SimpleBlobDetector to implement it. The changes

cv::copyTo (InputArray src, OutputArray dst, InputArray mask) this is mask https://docs.opencv.org/master/d2/de8/group_

cv::copyTo (InputArray src, OutputArray dst, InputArray mask) this is mask detail:https://docs.opencv.org/master/d2/de8

may be you have lossed some dll?

where is the image?

Is OpenVINO be able to use under QT? Hi,guys. does any one kown Is OpenVINO be able to use under QT? this may be a stra

as I koow,OpenCV is not support GPU yet?

the link is died

have a look at this https://blog.csdn.net/daoqinglin/article/details/23628125

what about quirc？

have a look at function "copyto",and it's offset

where is the leaf dataset?

could you give more c++ code?

thai's all right!

yes,i think

sorry for my early comment,today ,i did some experiment and find it is really hard to the blend. BTW ,I tried "Poisson c

here is my result here is my suggest code,may it help you . //answerOpenCV OpenCV / C++ - Filling holes #include

the answer is YES. what you need is pyrdown the images and lineblend them at each pyramid

the answer of your question is YES.and what's more,we get the cam params by using findchessboardcorners function (when

you should think about feature points

4.63716sec 3.80283sec in my PC,great work!

show the original image and we may give you some help

in this blog https://www.cnblogs.com/jsxyhelu/p/GOMFCTemplate2.html i will show you how to show a OpenCV image in a dia

the code works,thanks

wait for your images

that's great!

have a look at east

there is a image of 3 shapes

if i use the code blew ,i get the result

int main( int argc, char** argv )
{
    //read the image
    Mat img = imread("e:/sandbox/leaf.jpg");
    Mat bw;
    bool dRet;
    //resize
    pyrDown(img,img);
    pyrDown(img,img);

    cvtColor(img, bw, COLOR_BGR2GRAY);
    //morphology operation  
    threshold(bw, bw, 150, 255, CV_THRESH_BINARY);
    //bitwise_not(bw,bw);
    //find and draw contours
    vector<vector<Point> > contours;
    vector<Vec4i> hierarchy;
    findContours(bw, contours, hierarchy, CV_RETR_LIST, CV_CHAIN_APPROX_NONE);
    for (int i = 0;i<contours.size();i++)
    {
        RotatedRect minRect = minAreaRect( Mat(contours[i]) );
        Point2f rect_points[4];
        minRect.points( rect_points ); 
        for( int j = 0; j < 4; j++ )
            line( img, rect_points[j], rect_points[(j+1)%4],Scalar(255,255,0),2);
    }
    imshow("img",img);
    waitKey();
    return 0;
}

but ,in fact ,the contour 1 and contour 2 which i fingure out in RED do not get the right widht and height.

what i want should be this

i did't find the appropriate function or any Doc from Opencv to do this work It's been bothering me for days any help will be appreciate!

@StevenPuttemans

thanks for StevenPuttemans,I have get the final slove #include "opencv2/imgcodecs.hpp" #include "opencv2/highgui.h

i think there are at leaset two steps to solve your problem 1、find the equipment 2、save the picture

great,you should close your question now

I think berak is right

it's really hard