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What about a top-hat filtering? From an ipython console:

kernel18 = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(18,18))
filtered = cv2.morphologyEx(image, cv2.MORPH_TOPHAT, kernel18)

The image may has to be converted into a greyscaled image.

What about a top-hat filtering? From an ipython console:

kernel18 = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(18,18))
filtered = cv2.morphologyEx(image, cv2.MORPH_TOPHAT, kernel18)

The image may has to be converted into a greyscaled image.

What about a top-hat filtering? From an ipython console:

kernel18 = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(18,18))
filtered = cv2.morphologyEx(image, cv2.MORPH_TOPHAT, kernel18)

The image may has to be converted into a greyscaled image.

It's possible to get something like this image with a smaller kernel: !Top hat on an image](http://postimg.org/image/k7n2fjrfd/)

What about a top-hat filtering? From an ipython console:

kernel18 = cv2.getStructuringElement(cv2.MORPH_ELLIPSE,(18,18))
filtered = cv2.morphologyEx(image, cv2.MORPH_TOPHAT, kernel18)

The image may has to be converted into a greyscaled image.

It's possible to get something like this image with a smaller kernel: !Top hat kernel (clik on an image](http://postimg.org/image/k7n2fjrfd/)the link)