数字图像处理 -灰度变换之 gamma变换（gamma transformation）

最新推荐文章于 2024-09-29 15:43:50 发布

D_turtle

最新推荐文章于 2024-09-29 15:43:50 发布

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本文通过Matlab代码演示了不同Gamma值下的图像灰度级变化。当Gamma小于1时，图像变得更亮；反之则更暗。实验中使用了一系列Gamma值，包括0.1、0.2、0.4、0.6、0.8、1、2.5和5，并展示了相应的图像处理效果。

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Reference： https://blog.youkuaiyun.com/zhoufan900428/article/details/12709361

The gamma transformation is different from log transformation. Its code is similar to that of the last blog. Its figure is as follows:

Figure :

gamma transformation Matlab code:

f = imread('2.jpg');  
I=rgb2gray(f);
f = mat2gray(I);

gamma1 = 0.1;
g_0_1 = f.^gamma1; 
gamma2 = 0.2;
g_0_2 = f.^gamma2; 
gamma3 = 0.4;
g_0_4 = f.^gamma3;
gamma4 = 0.6;
g_0_6 = f.^gamma4;
gamma5 = 0.8;
g_0_8 = f.^gamma5; 
gamma6 = 1;
g_1 = f.^gamma6;  
gamma7 = 2.5;
g_2_5 = f.^gamma7; 
gamma8 = 5;
g_5 = f.^gamma8; 
  
figure();  
subplot(3,3,1);  
imshow(f,[0 1]);  
xlabel('a).Original Image');  

subplot(3,3,2);  
imshow(g_0_1,[0 1]);  
xlabel('b).\gamma =0.1'); 

subplot(3,3,3);  
imshow(g_0_2,[0 1]);  
xlabel('c).\gamma =0.2'); 

subplot(3,3,4);  
imshow(g_0_4,[0 1]);  
xlabel('d).\gamma=0.4'); 

subplot(3,3,5);  
imshow(g_0_6,[0 1]);  
xlabel('e).\gamma=0.6'); 

subplot(3,3,6);  
imshow(g_0_8,[0 1]);  
xlabel('f).\gamma=0.8');  
  
subplot(3,3,7);  
imshow(g_1,[0 1]);  
xlabel('g).\gamma=1 i.e. original image');  
  
subplot(3,3,8);  
imshow(g_2_5,[0 1]);  
xlabel('h).\gamma=2.5'); 

subplot(3,3,9);  
imshow(g_5,[0 1]);  
xlabel('i).\gamma=5');

Figure :

we can see that if gamma <1, the gray level becomes brighter, otherwise, it is darker. It is obvious to know if we connect this figure with the last figure, namely, the gamma image.

I make some improvements on the basis of the original blog. https://blog.youkuaiyun.com/zhoufan900428/article/details/12709361 Thanks again.

Due to level constraint, please comment if you ave any questions about this blog. I would greatly appreciate it if you kindly give me some feedback.
^_^