PowerPoint Presentation

- TECHNION - ISRAEL INSTITUTE OF TECHNOLOGY

: " : 2012

:

1

1 GUI 22 ( ) ( )

: - , , /

:

MRI MRI

2 3

' : - .

, () , , . , . , . .

( ), . " , ( ) , . / .

: . . .

: " MRI ( ) . " .

3 4 / MRI 0.5 : , GUI MRI ( ).

Matlab .4 5 - -

-

- ,

HPF - Laplacian

: - HPF 0.5 .

, , , . () . . .

( )

() . " = ( ) . .

. . HPF 0 0 0.

HPF , , .

DFT . ' / . ( " ) . ( / ) .

5 - 6 :Fourier transformFilter functionInverse fourier transformPre -processingPost-processing

0.5 , , ' . . . / ( /) . / . : () . ( ) . () ( FIR).6 7 GUI - DFTAdditionalHistogram-manipulationEdgeTextureHPFLPFBPFBSFHPFLPFMotionAdaptivecontourEntropyAverageAverageIdealIdealIdealIdealUnsharpAuto-stretchingRangeAverage-DiskAverage-DiskGaussianGaussianGaussianGaussianBrightnessGaussianGaussianBtw

Btw

Btw

BtwEqualizationLaplacianWienerRectRectQuantizationLogDomeStretchingPrewittEllipseSobel0.5 - Type- (Sub-Type)" GUI7 8 GUI /

1 GUI

GUI . "" . GUI HELP ( , ') .8 - 9

(figure 2)

(figure 3) ((figure 51 " / , . , GUI . , , ' .9 GUI 10

/ Browse ( )1 GUI Preprocessing Setup GUI . . /- . /, , . ( ) adaptive equalization. GUI .10 11

LPF Dome - LPF Dome

1 LPF-DOME ( ) " , . ( ) ". . .

- LPF . .

11 12 - LPF-Wiener

( ):

:

1 ( : ) ( ) ( ) . " . , "".

( ) , .

12 13 LPF - ()

LPF ()LPF - Average

" LPF-Average

:

. , , / , . " (pre-processing) . . LPF "" / .

LPF . / . LPF 0 1 1.

13 14 Wiener 3x3 0.01 0.01 0

WIENER 15 Dome r=15, r_max=67, # steps=10, min height=0.5 salt&pepper

LPF-DOME 16 HPF - ()

HPF .

" HPF-Average

HPF - Average0.5 : , , , , '. HPF ( ).

HPF 0 0 0.

HPF , , .

16 17 HPF Cutoff frequency=30Cutoff frequency=21IdealCutoff frequency=30Cutoff frequency=21Gaussian

0.5Original Picture

HPF ( ).

17 : ( )

MRI MRI 18 - . / . MRI . ( ) . .

18

" LPF " LPF-Average

19 - 19 " HPF-Gaussian

" HPF 20 20 " BSF-Gaussian

" BSF 21 21 " BPF-Butterworth

" BPF 22 , .22 23

BPF

" LPF/BSF ( ) .

" HPF/BPF .

, .

, / , .

24 ( ) . .24