2 added another solution edited Jun 16 '13 at 0:08 shrx 5,93722 gold badges1818 silver badges5151 bronze badges Ad 1): Applying Closing[EdgeDetect[image, 3], 5]  Produces a well defined image: Afteredit: another option: Binarize[ImageAdjust[TopHatTransform[image, DiskMatrix[20]]]]  After this, it's the same procedure as in the related examples you've found. Ad 1): Applying Closing[EdgeDetect[image, 3], 5]  Produces a well defined image: After this, it's the same procedure as in the related examples you've found. Ad 1): Applying Closing[EdgeDetect[image, 3], 5]  Produces a well defined image: edit: another option: Binarize[ImageAdjust[TopHatTransform[image, DiskMatrix[20]]]]  After this, it's the same procedure as in the related examples you've found. 1 answered Jun 15 '13 at 23:41 shrx 5,93722 gold badges1818 silver badges5151 bronze badges Ad 1): Applying Closing[EdgeDetect[image, 3], 5]  Produces a well defined image: After this, it's the same procedure as in the related examples you've found.