Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here is the code that implemented in C++ to find largest contour and draw it as an image, I am not familiar with OpenCV JAVA but you can have something like similar in JAVA.</p> <pre><code>#include &lt;iostream&gt; #include "opencv2\highgui\highgui.hpp" #include "opencv\cv.h" using namespace cv; using namespace std; int main() { int largest_area=0; int largest_contour_index=0; Rect bounding_rect; Mat src = imread("src.jpg"); //Load source image Mat thr(src.rows,src.cols,CV_8UC1); Mat dst(src.rows,src.cols,CV_8UC1,Scalar::all(0)); cvtColor(src,thr,CV_BGR2GRAY); //Convert to gray threshold(thr, thr,25, 255,THRESH_BINARY); //Threshold the gray vector&lt;vector&lt;Point&gt;&gt; contours; // Vector for storing contour vector&lt;Vec4i&gt; hierarchy; findContours( thr, contours, hierarchy,CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE ); // Find the contours in the image for( int i = 0; i&lt; contours.size(); i++ ) // iterate through each contour. { double a=contourArea( contours[i],false); // Find the area of contour if(a&gt;largest_area){ largest_area=a; largest_contour_index=i; //Store the index of largest contour bounding_rect=boundingRect(contours[i]); // Find the bounding rectangle for biggest contour } } Scalar color( 255,255,255); drawContours( dst, contours,largest_contour_index, color, CV_FILLED, 8, hierarchy ); // Draw the largest contour using previously stored index. rectangle(src, bounding_rect, Scalar(0,255,0),1, 8,0); imshow( "src", src ); imshow( "largest Contour", dst ); waitKey(0); } </code></pre> <p>Hope these help....</p>
    singulars
    1. This table or related slice is empty.
    1. POExtract area detected by color using OpenCV in Android
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USHaris
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CODoes this code allow to identify the area only or to identify and extract?
      singulars
      1. PO
      1. USTharakaNirmana
    2. COHere in the above example the code find largest contour and draw it. In your case I think you are already got the largest contour and then simply draw it using drawContours(http://docs.opencv.org/java/2.4.6/org/opencv/imgproc/Imgproc.html#drawContours(org.opencv.core.Mat,%20java.util.List,%20int,%20org.opencv.core.Scalar)) in Java.
      singulars
      1. PO
      1. USHaris
    3. COI used drawContouer() method like this: Imgproc.drawContours(mDilatedMask, contours, -1, new Scalar(0, 255, 0), 1); When I save the image, I can see only a black rectangle with a green border. I cannot see the information inside the rectangle. I have edited my code
      singulars
      1. PO
      1. USTharakaNirmana
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload