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2 Pages

### blpf

Course: ECE 445, Fall 2009
School: UWO
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Word Count: 164

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im2 function = blpf(im, D0) %MYFILT Applies Butterworth lowpass filter of order 2 with % cutoff frequency D0 to an image. % %im2 = blpf(im, D0) where im is the input image matrix, D0 is the cutoff %frequency and im2 is the output image. NOTE: Output is of type uint8 % Should pad input image to avoid wrap-around error. % Also make image square so frequency variables have % same meaning in both directions....

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im2 function = blpf(im, D0) %MYFILT Applies Butterworth lowpass filter of order 2 with % cutoff frequency D0 to an image. % %im2 = blpf(im, D0) where im is the input image matrix, D0 is the cutoff %frequency and im2 is the output image. NOTE: Output is of type uint8 % Should pad input image to avoid wrap-around error. % Also make image square so frequency variables have % same meaning in both directions. Should also pad % enough to ensure padded image size is integer power % of 2 so that fastest version of fft2 is invoked. imsize size( = im ); newsize = 2* max( imsize ); IM = fft2( double(im), newsize, newsize); IM = fftshift(IM); % Center the DFT % Generate ideal lowpass filter [m, n] = meshgrid(-newsize/2 : newsize/2-1); D2 = m.^2 + n.^2; % Distance squared from (m,n)=(0,0) G = 1 + 0.414*(D2/(D0*D0)).^2; G = 1./G; % Apply convolu...

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function [im2, a] = level( fname )%LEVEL Does background removal from an image of type uint8.%%[im2, a] = level(fname) where fname is a string representing% the filename of the image (e.g., 'rice.png'), im2 (uint8) is the% image after backgroun
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function im2 = myfilt(im, D0)%MYFILT Applies ideal lowpass filter with cutoff frequency D0 to an image.%%im2 = myfilt(im, D0) where im is the input image matrix, D0 is the cutoff%frequency and im2 is the output image. NOTE: Output is of type uin
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