CODEWITHSUNDEEP
pythoncomputer-visioncentroid
Giuseppe Puglisi
Giuseppe Puglisi

Reputation: 503

Find the pixel of center of a circle in an image

Hy guys, I need to find the coordinates of the center of the small circles inside in an image. I don't want to use the Hought method of cv. Every circle has radius of 20 pixels.

The image is like this:

enter image description here

I read the image in grayscale because I want e value normalized between 0-255.

This is the code, I can't find where I wrong:

img = cv2.imread('input_image',0)#read in grayscale
lista = []
rows,cols = img.shape
for i in range(rows):
    for j in range(cols):
        k = img[i,j]
        if k == 0:
            #No circle
            continue
        else:
            #Circle
            x=i+10
            y=j
            k = img[x,y]#centro del pallino
            i+=21
            
            arr = np.array([x,y,k])
            lista.append(arr)
      
print(lista)

I would to have a list of arrays, where each arrays contains the x coordinate, the y coordinate and the value of pixel. Where i wrong?

Upvotes: 0

Views: 788

Answers (1)

Dwij Mehta
Dwij Mehta

Reputation: 98

Since the top most point of the circle will be encountered for the first time in the for-loop, x and y values should be updated as x=i and y = j+10.

Also, this logic would not work if there were two circles such that the line joining centers of the two circles is nearly horizontal.

Upvotes: 1

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