I have got the following image:
There are curvs on the picture. i would like to find center of the circles containing curves.
i tried opencv and hough circle transform but had no results.
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You'll need to improve the contrast of the image first, then filter it strongly to remove the noise. since the circles are 'thick' (blurry), you can filter quite a bit without destroying the circles structure.
I would then apply some edge detection algorithm to get a binary edge image that can be processed by the Circular Hough Transform.
I get the following edge image from your image:
Using the following MATLAB commands:
% x is the input grayscale image. First we adaptively improve the contrast over the image y= adapthisteq(x); % next we use the Canny edge detector with a strong Gaussian lowpass filter ee=edge(y, 'canny', , 5);