What filter is recommended before applying HoughCircles

asked 2013-04-23 15:17:34 -0600

hayden
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Hello, as I applied HoughCircles and failed to detect the circles, does any one recommend to apply any filter before HoughCircles? Thanks.

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answered 2013-04-24 09:27:12 -0600

zerog80

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updated 2013-04-24 09:28:31 -0600

The usual one is the Gaussian Blur, because a low-pass filter can reduce the detection of false circles. However, take into account that the Hough Circles function incorporates a Canny edge detector that is applied before the actual detection, so maybe you have to better tweak its threshold parameters.

The full example can be found here.