Index

camera noise, 65 closing, 16

computer-aided analysis, 4, 6 computer-aided diagnosis, 4, 9

detection

abnormal features, 9, 12 anatomical features, 9 blood vessels, 12, 21, 52, 59 circles, 9, 24, 27, 43

edges, 17, 43, 53 lines, 22, 25

dilation, 15, 16

DRIVE, 24, 37, 40, 41, 46, 49 drusen, 6

edge detection

Canny, 19–21, 43, 44, 53 Prewitt, 17, 19

Sobel, 17, 19–21, 28, 29, 33, 43, 44, 53 edge map, 10, 19, 20, 24, 27–29, 43, 44, 46, 48,

53 eigenvalues, 32, 34 erosion, 15–18

Euclidean distance, 39, 64, 65

evaluation of results, 39, 51, 52, 54, 56, 64, 65 eye

anatomy, 1

false positive, 40

field of view (FOV), 2, 37–39 filter

Gabor, 12, 22–25, 27, 59, 61, 62, 64 matched, 10, 12, 21, 22

mean, 15 median, 15

morphological, 10, 12, 15–18 fovea, 3, 4, 12

free-response receiver operating characteristics (FROC), 40, 51, 53, 55, 64, 67, 68

fundus image, 2–4, 9

Gabor filter, 22–25, 27, 33, 35, 59 gradient magnitude, 19, 21

Hough accumulator, 44, 46 Hough space, 46, 48, 49, 51, 52, 55

Hough transform, 24, 43, 44, 53, 69, 71, 72

landmark, 5, 9

luminance component, 15, 21

macula, 3, 4, 11

magnitude response, 59, 61, 62, 64 mask, 15, 17, 18, 39, 40

node map, 25, 27, 35, 60, 62, 64, 65, 68–72

opening, 15–18 optic cup, 39, 56 optic disc, 1

optic nerve head (ONH), 1, 3, 4, 9, 39, 43 orientation field, 24, 25, 27, 31, 33–35, 59, 61,

62, 64, 75

overlap, 39–41, 49, 51, 52, 55, 56, 72

90 INDEX

peripapillary atrophy, 39

phase portraits, 29, 33, 59, 69, 71, 72 Prewitt operators, 17, 19

retina, 1

disorders, 1, 4–6, 37, 38, 56, 65 imaging, 2

vascular architecture, 4

vein and artery, 1, 39, 59, 69 retinopathy of prematurity (ROP), 1

scale factor, 38, 40, 41, 46

sclera, 39

scleral cresent, 39, 56 sensitivity, 40, 41

sobel operators, 17, 19, 20, 28, 29, 43, 46, 48, 53 spatial resolution, 23, 37, 38, 46

STARE, 37, 39, 40, 43, 46, 51

threshold, 43, 46, 48, 53–55, 62 tortuosity, 2, 4, 5, 12

true negatives, 40

vascular arcades, 5