Fig. 3

X-ray CT volume image processing, using a 4-week-old Kinandang Patong as the scanning subject: a scaled-up horizontal slices of an X-ray CT volume, filtered using 3-D median filters of kernel sizes 1, 3, 5, 7, and 9, with the numbers above the images indicating kernel size, and numbers on the images indicating the contrast-to-noise ratio. Arrowheads in the leftmost image indicate representative root fragments; b effect of blur filter kernel size on edge detection. Numbers above the images indicate the kernel size, representative root fragments are indicated by arrowheads, roots indicated by the white arrowhead are hardly visible using kernel size 5, and the roots indicated by the yellow arrowheads appear stuck together when using a large kernel size, such as 57; c horizontal projection of the image-processed CT volume without thresholding or size opening; d horizontal projection of the image-processed CT volume with thresholding and size opening