Klepnutím lze upravit styl předlohy nadpisů.

Signal Processing Laboratory
1 /18
SPLAB, BUT
Klepnutím lze upravit styl předlohy
nadpisů.
http://spl.utko.feec.vutbr.cz
Jiří Minář
Faculty of Electrical Engineering and Communication
Department of Telecommunications
Czech Republic
European Union
Signal Processing Laboratory
2 /52
/18
SPLAB, BUT
Eye, Fundus
Image, styl
OCTpředlohy
image
Klepnutím
lze upravit
nadpisů.
Image source: wikipedia.org
Brno University of Technology, Czech Republic
Signal Processing Laboratory
3 /52
/18
SPLAB, BUT
Medical
diagnostic
Klepnutím
lze upravit
styl předlohy
nadpisů.
• Diseases diagnostic
– Glaucoma
– Diabetic Retinopathy
• Veins and blood vessels
detection
– Aneurysms detection
Brno University of Technology, Czech Republic
Signal Processing Laboratory
4 /52
/18
SPLAB, BUT
Fundus
Database
Klepnutím
lzeImage
upravit
styl předlohy
nadpisů.
• DRIVE, HRF - Fundus image DB
• Fundus (retinal) Images with
manual veins selection
R
G
B
Brno University of Technology, Czech Republic
Signal Processing Laboratory
5 /52
/18
SPLAB, BUT
Macula detection
– Fundus
image
Klepnutím
lze upravit
styl předlohy
nadpisů.
• Using databases DRIVE
• Multi-level tresholding
• Elipse detection
Brno University of Technology, Czech Republic
Signal Processing Laboratory
6 /52
/18
SPLAB, BUT
Image
Klepnutím
lzepre-processing
upravit styl předlohy
nadpisů.
• Adaptive histogram equalization –
– CLAHE mothod (Enhance Local Contrast)
original image green channel
Clip limit = 5
Clip limit = 15
Brno University of Technology, Czech Republic
Signal Processing Laboratory
7 /52
/18
SPLAB, BUT
Tresholding
Klepnutím lze
upravit styl předlohy
nadpisů.
• Adaptive tresholding
• Adaptive tresholding after erosion (300px)
Brno University of Technology, Czech Republic
Signal Processing Laboratory
8 /52
/18
SPLAB, BUT
detections
KlepnutímEdge
lze upravit
styl předlohy
nadpisů.
• Sobel operator
• Canny edge detection
• Kirsch operator
• Laplace operator
Brno University of Technology, Czech Republic
Signal Processing Laboratory
9 /52
/18
SPLAB, BUT
filter
KlepnutímAdaptive
lze upravit
styl předlohy
nadpisů.
•
2D Masks
• Thin veins
• Medium veins
• Wide veins
Brno University of Technology, Czech Republic
Signal Processing Laboratory
10 /52
/18
SPLAB, BUT
Adaptive
filter - response
Klepnutím
lze upravit
styl předlohy
nadpisů.
wide
medium
thin
Final image:
ACC≈95%
Brno University of Technology, Czech Republic
Signal Processing Laboratory
11 /52
/18
SPLAB, BUT
Klepnutím Vectorization
lze upravit styl předlohy
nadpisů.
• Detection of vein’s ending
• Detection of vein’s branching
• morphological operation (erosion, opening)
• 8-bits binary surrounding
ending branching
example of non-branching
Brno University of Technology, Czech Republic
Signal Processing Laboratory
12 /52
/18
SPLAB, BUT
Problems
& Results
Klepnutím
lze upravit
styl předlohy
nadpisů.
• Noise in an image:
• Reflection:
• Results:
Brno University of Technology, Czech Republic
Signal Processing Laboratory
13 /52
/18
SPLAB, BUT
Future
work
Klepnutím lze
upravit
styl předlohy
nadpisů.
• Enhance detection of branching and ending of
veins and blood vessels
• Detection of veins/blood vessels interruptions
• Can be used also for security purposes
13
Brno University of Technology, Czech Republic
Signal Processing Laboratory
14 /18
SPLAB, BUT
Klepnutím lze upravit styl předlohy
nadpisů.
http://spl.utko.feec.vutbr.cz
Acknowledgement:
This work was also prepared with the support of the MSMT project no. 2B06111:
The Research of Algorithms for Processing of Digital Images and Image Sequences
and the MSMT project
The Research of Algorithms for Processing of Digital Images and Image Sequences,
code: ME10123.
Some functions from the OpenCV library (Open Source Computer Vision) were used for
the implementation of algorithms.
Czech Republic
European Union