CvInvoke.cvContourArea in c#, Emgu

asked 2013-10-24 20:26:36 -0600

fred
11 ●1 ●2

updated 2013-10-25 02:47:46 -0600

20029 ●16 ●82 ●207 http://stevenputtemans...

Hi, I am using C# to find the area within a contour and need help translating c/c++ code as found in the following example: Unfortunately, C#, Emgu does not support vectors.

vector<Point> contour;
contour.push_back(Point2f(0, 0));
contour.push_back(Point2f(10, 0));
contour.push_back(Point2f(10, 10));
contour.push_back(Point2f(5, 4));

double area0 = contourArea(contour);
vector<Point> approx;
approxPolyDP(contour, approx, 5, true);
double area1 = contourArea(approx);

cout << "area0 =" << area0 << endl <<
        "area1 =" << area1 << endl <<
        "approx poly vertices" << approx.size() << endl;

Thx, Fred.

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Comments

Since @Luca Del Tongo has made the effort to post an answer I will keep it open for some replying. However, keep in mind that EmguCV is not an official supported OpenCV package and that questions about it should be posted at the correct supporting EmguCV forum.

StevenPuttemans ( 2013-10-25 03:04:56 -0600 )edit

Given that it was quite simple to reply to this question I did it :-) Feel free to delete it as it's not related to opencv and break site rules...

Luca Del Tongo ( 2013-10-25 06:00:49 -0600 )edit

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using (MemStorage storage = new MemStorage()) //allocate storage for contour approximation { Contour<Point> contour = new Contour<Point>(storage); contour.Push(new Point(0, 0)); contour.Push(new Point(0, 10)); contour.Push(new Point(10, 10)); contour.Push(new Point(10, 0)); double area0 = contour.Area; Contour<Point> approxContour = contour.ApproxPoly(contour.Perimeter * 0.05, storage); }

CvInvoke.cvContourArea in c#, Emgu

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