Could you tell me how to extract the contour points, small white to solve, thank you

CodePudding user response:

@ 4 teachers, zhao

CodePudding user response:

It is best to opencv

CodePudding user response:

The contour, to extract the image is to use opencv, may refer to https://blog.csdn.net/sac761/article/details/52003513

CodePudding user response:

Fyi:

 # include "opencv2/highgui/highgui. HPP" 
# include "opencv2/imgproc/imgproc HPP" 
# include "opencv2/imgproc/imgproc_c. H" 
using namespace std; 
Using the namespace CV; 
Mat img, smallImg, gray, bw; 
VectorVector Contours. 
Int threshval=128; 
The Rect r; 
The Rect maxrect brect; 
Int independence idx, n; 
Const static Scalar colors [15]={
CV_RGB (0, 0128), 
CV_RGB (0128, 0), 
CV_RGB (0128128), 
CV_RGB (128, 0, 0), 
CV_RGB (128, 0128), 
CV_RGB (128128, 0), 
CV_RGB (128128128), 
CV_RGB (160160160), 
CV_RGB (0, 0255), 
CV_RGB (0255, 0), 
CV_RGB (0255255), 
CV_RGB (255, 0, 0), 
CV_RGB (255, 0255), 
CV_RGB (255255, 0), 
CV_RGB (255255255), 
}; 
Scalar color; 
Void gamma_correct (Mat& Img, Mat& DST, double gamma) {
Mat temp. 
CvMat TMP. 

Img. ConvertTo (temp, CV_32FC1, 1.0/255.0, 0.0); 
TMP=temp; 
CvPow (& amp; TMP, & amp; TMP, gamma); 
Temp. ConvertTo (DST, CV_8UC1, 255.0, 0.0); 
} 
Int main () {
CvNamedWindow (" display ", 1); 
Img=imread (" image. JPG ", 1); 
R.x=img. Cols/10; 
R.y=img. Rows/3; 
Truly idth=img. Cols * 8/10; 
R.h. eight=img. Rows * 2/3; 
SmallImg=img (r); 
CvtColor (smallImg, gray, CV_BGR2GRAY); 
//medianBlur (gray, gray, 5); 
EqualizeHist (gray, gray); 
Gamma_correct (gray, gray, 4.0); 
Imshow (" display ", gray); 
WaitKey (0); 

Bw=(gray> Threshval); 
Imshow (" display ", bw); 
WaitKey (0); 

Mat Structure0=getStructuringElement (MORPH_RECT, Size (3, 3)); 
Erode (bw, bw, Structure0, Point (1, 1)); 
Mat Structure1=getStructuringElement (MORPH_RECT, Size (6, 6)); 
Dilate (bw, bw, Structure1, Point (1, 1)); 
Imshow (" display ", bw); 
WaitKey (0); 

FindContours (bw, contours, hierarchy, RETR_EXTERNAL CHAIN_APPROX_SIMPLE); 
if (! Contours. The empty () & amp; & ! Hierarchy. The empty ()) {
Independence idx=0; 
N=0; 
Vector Approx. 
For (; Idx>=0; Independence idx=hierarchy [independence idx] [0]) {
Color=colors [15] independence idx %; 
//drawContours (smallImg, contours, independence idx, color, and 1, 8, hierarchy); 
ApproxPolyDP (Mat (contours [independence idx]), approx, arcLength (Mat (contours [independence idx]), true) * 0.005, true);//0.005 will flash straightening coefficient 
Const Point * p=& amp; Approx [0]. 
Int m=(int) approx. The size (); 
Polylines (smallImg, & amp; P, & amp; M, 1, true, color); 
Circle (smallImg, Point (p [0]. X, p [0]. Y), 3, color); 
Circle (smallImg, Point (p [1]. X, p [1]. Y), 2, color); 
For (int I=2; in++; 
If (1==n) {
Maxrect=boundingRect (Mat (contours [independence idx])); 
} else {
Brect=boundingRect (Mat (contours [independence idx])); 
CvRect Mr (maxrect), br (brect); 
Maxrect=cvMaxRect (& amp; Mr, & amp; Br); 
} 
} 
Circle (smallImg, Point (maxrect. X + maxrect. Width/2, maxrect. Y + maxrect. Height/2), 2, CV_RGB (0, 255)); 
} 
Imshow (" display ", smallImg); 
WaitKey (0); 
CvDestroyWindow (" display "); 
return 0; 
} 

CodePudding user response:

Opencv findcontours function can output all coordinates points directly,

CodePudding user response:

reference 5 floor SCSJHKXX reply:

opencv findcontours function can output all coordinates points directly,

Have you got any specific code, I use this function to draw the outline, but do not know how the output coordinate points

CodePudding user response:

refer to 6th floor qq_37199787 response:

Quote: refer to the fifth floor SCSJHKXX reply:

opencv findcontours function can output all coordinates points directly,

Have you got any specific code, I use this function to draw the outline, but do not know how to coordinate point output

You don't find the contours of is an array, from the array X, Y can't take? .

CodePudding user response:

Do you find?