Assertion: blood vessel | /r/CapableOf | represent different scales
Facets:
value: in the kernel
type: LOCATION
Source sentences:
text: Firstly, since a blood vessel usually appears darker than the background in the captured images and, thus, has a concave shape, the green channel of the retinal image can be smoothed by the matched Gaussian filter with standard deviation , the result of which is denoted as . also represents different scales in the kernel.