www.gusucode.com > IPCV_Eval_Kit_R2019a_0ce6858工具箱matlab程序源码 > IPCV_Eval_Kit_R2019a_0ce6858/code/demo_files/I2_10_2a_fft2.m
%% 2師尦偺崅懍僼乕儕僄曄姺偺僨儌 clear;clc;close all;imtool close all %% 256x256偺僥僗僩夋憸偺惗惉 I = zeros(256,256); % 梫慺0偱[256峴,256楍]偺峴楍偺惗惉 I(5:24,13:17) = 1; % 嵍忋偵敀偄椞堟傪嶌惉 figure;imshow(I); %% 2師尦偺FFT寁嶼丗嵍忋嬿偑僛儘廃攇悢學悢(DC惉暘) F = fft2(I); figure;imshow(log(abs(F)), [-1 5]);colormap(jet); colorbar; % DC惉暘偑嵍忋嬿 %% fftshift娭悢傪梡偄丄僛儘廃攇悢學悢(DC惉暘)傪嵍忋嬿偐傜丄拞怱傊堏摦 % 戞堦徾尷偲戞嶰徾尷丄戞擇徾尷偲戞巐徾尷傪擖傟懼偊 Fs = fftshift(F); figure;imshow(log(abs(Fs)), [-1 5]);colormap(jet); colorbar; %% 廲幉傪懳悢昞帵 figure;surf(log(abs(Fs))); shading interp; axis ij;xlabel('X');ylabel('Y'); %% 廔椆 %% 廲僛僽儔僷僞乕儞 I = [ones(256,2), zeros(256,2)]; % 墶曽岦4僺僋僙儖廃婜僷僞乕儞 I1 = repmat(I,[1,64]); % 256x256 僺僋僙儖偺夋憸 imtool(I1); F1 = fft2(I1); Fs1 = fftshift(F1); figure;surf(abs(Fs1)); shading interp; axis ij;xlabel('X');ylabel('Y'); %% 廲僛僽儔僷僞乕儞 (旕2偺奒忔僒僀僘) I2 = repmat(I,[1,20]); % 256x80 僺僋僙儖偺夋憸 imtool(I2); F2 = fft2(I2); Fs2 = fftshift(F2); figure;surf(abs(Fs2)); shading interp; axis ij;xlabel('X');ylabel('Y'); %% 廲僛僽儔僷僞乕儞 (旕2偺奒忔僒僀僘丗FFT帪偵2偺奒忔傊) F3 = fft2(I2, 256, 256); % 夋憸僨乕僞傪0杽傔偱攝楍僒僀僘傪戝偒偔偟丄256x256偺寢壥傪惗惉 Fs3 = fftshift(F3); figure;surf(abs(Fs3)); shading interp; axis ij;xlabel('X');ylabel('Y'); %% 廲僛僽儔僷僞乕儞 (旕2偺奒忔僒僀僘丗庤摦偱2偺奒忔僒僀僘傊曄峏) I3 = [I2, zeros(256,176)]; imtool(I3); F3 = fft2(I3); Fs3 = fftshift(F3); figure;surf(abs(Fs3)); shading interp; axis ij;xlabel('X');ylabel('Y'); %% % Copyright 2014 The MathWorks, Inc.