Write a Matlab program that enables you to specify and keep only a proportion of

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Solution :

The Matlab code for reading in an image file, computing the magnitude spectrum, and plotting the requested images is as follows:

% plot_image_transform

%

% f=imread(’shuttle.tif’,’tiff’);

% f=imread(’xray.tif’,’tiff’);

f=imread(’hardware.tif’,’tiff’);

% plot original image in first quadrant

figure(1),subplot(221),imshow(f);

stitle=sprintf(’original tif file’);

title(stitle);

% compute image spectrum magnitude and plot in second quadrant

F=abs(fftshift(fft2(f)));

subplot(222),imshow(F, [ ]);

stitle1=sprintf(’abs of 2D FFT’);

title(stitle1);

% axis([-1 1 1 -1]);

xlabel(’horizontal frequency’),ylabel(’vertical frequency’);

% determine minimum and maximum of spectrum magnitude, print results

Fmin=min(min(F));

Fmax=max(max(F));

fprintf(’Fmin, Fmax: %f %f ’,Fmin,Fmax);

% scale magnitude based on Fmin and Fmax and plot in third quadrant

subplot(223),imshow(F, [1.5*Fmin, Fmax*1.e-3]);

stitle2=sprintf(’clipped/scaled abs of 2D FFT’);

title(stitle2);

xlabel(’horizontal frequency’),ylabel(’vertical frequency’);

% log scale magnitude and plot in fourth quadrant

subplot(224),imshow(log(1+F), [ ]);

stitle3=sprintf(’log transformed abs of 2D FFT’);

title(stitle3);

xlabel(’horizontal frequency’),ylabel(’vertical frequency’);

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