50
Z. Amini et al.
(a)
(b)
(c)
(d)
(a)
(b)
(c)
(d)
Fig. 3.4 Contrast enhancement results in a sample Topcon image. a original image, b proposed
method, c transform histogram shaping method, d CLAHE method. The second row shows an
enlargement of the specified region of first row images [49]
Table 3.4 Evaluation measure results; averaged over 130 OCT B-scans from the Topcon device
[49]
Method
Measure
CNR
EP
EME
Original
5.4880
1.0000
2.3250
Proposed method
13.4171
0.9037
5.4956
Transform hist.
shaping
11.6249
0.8875
1.3270
CLAHE
4.5240
0.9626
4.0596
Table 3.5 Evaluation measure results; averaged over 60 OCT B-scans from the Zeiss device [49]
Method
Measure
CNR
EP
EME
Original
6.0480
1.0000
13.8075
Proposed method
14.7005
0.9235
15.9087
Transform hist.
shaping
12.4268
0.8930
0.4188
CLAHE
5.6013
0.9990
9.4917