Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Shows the results of applying gamma correction to an input image using two different values of n, how does the shape of the curve change if we were to use a different value for n?
Transcribed Image Text:Logarithmic transformation functions can be used to compress the dynamic range of an
image in order to bring out features that were not originally as clear.
* Close all open figures and clear all workspace variables.
% Generate a logarithmic transformation function.
clear ;clc;close all
x = 0:255; c = 255 / log (256) ;
y=c*log (x + 1);
figure, plot (y),title('Log Mapping Function'), axis tight, axis square
% Use the transformation function to generate the adjusted image.
imread ('tire.tif');
= I
I_log = uint8 (y(I + 1)) ;
Figure, subplot (2,2,1), imshow (I), title('Original Image');
subplot (2,2, 2), imshow(I_log), title('Adjusted Image');
subplot (2,2,3),imhist(I),title('histogram of original image');
subplot (2,2,4), imhist(I_log), title ('histogram of log image');
% The inverse of the log function is as follows.
exp (x/c) - 1;
I_invlog
figure, subplot (3,1,1), plot (z), title ('Inverse-log Mapping Function');
subplot (3,1,2), imshow (I_invlog), title('Adjusted Image');
subplot (3,1,3), imhist(I_invlog), title ('histogram of invlog image');
= uint8 (z (I_log + 1)) ;
![% Create a negative transformation function and show the result after applied to the
moon image.
imread('moon.tif');
= uint8(255:-1:0);
y
I_neg
y (I + 1);
figure, subplot(1,3,1), plot(y),title('Transformation Function'),
xlim ( [0 255]), ylim([0 255]);
subplot (1,3,2), imshow (I), title ('Original Image');
subplot (1,3,3), imshow (I_neg), title('Negative Image');
I_cmp
imcomplement (I); figure, imshow(I_cmp)](https://content.bartleby.com/qna-images/question/a399817f-fafa-4575-9d3c-7151d439e0d0/ece5db4c-a3c1-40f6-b19a-f4f2f60e45f9/4ta4acq_processed.png)
Transcribed Image Text:% Create a negative transformation function and show the result after applied to the
moon image.
imread('moon.tif');
= uint8(255:-1:0);
y
I_neg
y (I + 1);
figure, subplot(1,3,1), plot(y),title('Transformation Function'),
xlim ( [0 255]), ylim([0 255]);
subplot (1,3,2), imshow (I), title ('Original Image');
subplot (1,3,3), imshow (I_neg), title('Negative Image');
I_cmp
imcomplement (I); figure, imshow(I_cmp)
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