1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
//Ex3_12
// Local Enhancement using Histogram Statistic
// Version : Scilab 5.4.1
// Operating System : Window-xp, Window-7
//Toolbox: Image Processing Design 8.3.1-1
//Toolbox: SIVP 0.5.3.1-2
//Reference book name : Digital Image Processing
//book author: Rafael C. Gonzalez and Richard E. Woods
clc;
close;
clear;
xdel(winsid())//to close all currently open figure(s).
a=imread('Ex3_12.tif');
//a=double(a);
[M N]=size(a);
/////////////////////////// Global Histogram Equalization /////////////////////////
[count cell]=imhist(a); // Histogram Calculation
figure,ShowImage(a,'Original Image');
title('Original Image','color','blue','fontsize',4);
r=cell'; // Transpose of matrix
nk=round(count)'; // Transpose of matrix
P=sum(nk);
probeblity_r=nk/P; // Probablity calculation
for i=1:length(r)
sum_1=0;
for j=1:i
sum_1=sum_1+probeblity_r(j);
end
s(i)=max(r)*sum_1;
end
s=round(s); // Rounding Approach
disp(s);
[nr nc]=size(s);
temp=s'; // Transpose of matrix
for i=1:M // Intensity Replacement in Original Image
for j=1:N
b(i,j)=temp(double(a(i,j))+1);
end
end
figure,ShowImage(b,'histogram Equlized Image');
title('Image Enhancement using Global Histogram Statistic ','color','blue','fontsize',4);
/////////////////////////// Image Enhancement using Local Histogram Statistic /////////////////////////
E=4;K0=0.4;K1=0.02;K2=0.4;
mask=3;
Mean_G=mean(double(a)); // Global Mean Value
Variance_G=variance(double(a)); // Global Variance Value
for i=1+floor(mask/2):M-floor(mask/2)
for j=1+floor(mask/2):N-floor(mask/2)
a1=a(i-floor(mask/2):1:i+floor(mask/2),j-floor(mask/2):1:j+floor(mask/2)) ;
Mean_L=mean(double(a1)); // Local Mean Value
Variance_L=variance(double(a1)); // Local Variance Value
if((Mean_L<=K0*Mean_G) & (K1*Variance_G<=Variance_L) & (Variance_L<=K2*Variance_G))
g(i,j)=E*a(i,j);
else
g(i,j)=a(i,j);
end
end
end
figure,ShowImage(g,'Local Histogram Statistic');
title('Image Enhancement using Local Histogram Statistic','color','blue','fontsize',4);
|
