How can I access all points of Contour that were created by me ?

Unity Engine
1

[OpencvForUnity]

I created Mat for webcamTexture and I draw contour on a particular area that was determined by me. I want to access all coordinate on contour. Because I want not only to change mat color but also add some color.

I reached x_min,x_max,x_min,x_max point on contour. When I put them for loop and I changed color I didn’t get a good result.

Is there any other method that I can use?

2

I create get coordinates function for access all points of contour.

ListMaxAndMins means that max and min points (x,y)

x_min,x_max,x_min,x_max points of contour.

Mat image means that your clone of contour.

You can create your clone contour. cloneContour = Yourexistingcontour.clone()

You can access all points of your contour values using the following function.

    public List<Point> getCoordinates(List<int> _maxAndMins, Mat image)
   {
       int x_max = _maxAndMins[0];
       int x_min = _maxAndMins[1];
       int y_max = _maxAndMins[2];
       int y_min = _maxAndMins[3];

       List<Point> cordinates = new List<Point>();
       for (int i = x_min; i <= x_max; i++)
       {
           for (int j = y_min; j <= y_max; j++)
           {
               //Debug.Log("i:" + i + " j:" + j);
               if (image.get(j, i)[0] == 0 & image.get(j, i)[1] == 1)
               {
                   cordinates.Add(new Point(i, j));
               }
           }
       }
       return cordinates;
   }

Also, you can get the color (R-G-B-A) values that are your accessed points using the following function.

public List<double[]> getColor(List<Point> cordinates, Mat image)
   {
       int r = 0, g = 0, b = 0, a = 0;

       List<double[]> colorlist = new List<double[]>();
       List<double[]> colorAvg = new List<double[]>();
       for (int i = 0; i < cordinates.Count; i++)
       {
           int x = (int)cordinates[i].x;
           int y = (int)cordinates[i].y;
           double[] color = image.get(x, y);

           colorlist.Add(color);
           r = (r + (int)colorlist[i][0]);
           g = (g + (int)colorlist[i][1]);
           b = (b + (int)colorlist[i][2]);
           a = (a + (int)colorlist[i][3]);            
           //Debug.Log("Color: "+ color.GetValue(0)+ "-"+ color.GetValue(1) + "-" + color.GetValue(2) + "-" + color.GetValue(3));
       }
       r = r / colorlist.Count;
       g = g / colorlist.Count;
       b = b / colorlist.Count;
       a = a / colorlist.Count;
       colorAvg.Add(new double[4] { r, g, b, a } );


       // Average R-G-B-A values

       Debug.Log("Avg R:" + colorAvg [0][0]);
       Debug.Log("Avg G:" + colorAvg [0][1]);
       Debug.Log("Avg B:" + colorAvg [0][2]);
       Debug.Log("Avg A:" + colorAvg [0][3]);

       return colorAvg ;
   }