Witryna16 mar 2016 · imshow (I, []) displays the grayscale image I scaling the display based. on the range of pixel values in I. imshow uses [min (I (:)) max (I (:))] as. the display … WitrynaYou can fix this problem by using the function fftshift, which swaps the quadrants of F so that the zero-frequency coefficient is in the center. F = fft2 (f,256,256);F2 = fftshift (F); imshow (log (abs (F2)), [-1 5]); …
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WitrynaYou are missing the abs command. Try the following: f = fft2 (a) shft = fftshift (abs (f)); imshow (log (shft)) %stretching Share Improve this answer Follow answered Sep 26, 2012 at 23:11 Andrey Rubshtein 2,770 1 19 23 Add a … Witryna14 kwi 2024 · 在可视化傅里叶频谱时,使用np.log(1+np.abs(x))和20*np.log(np.abs(x))之间的选择是个人喜好的问题,可以取决于具体的应用程序。 一般情况下会使用Np.log … can allergies cause photophobia
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Witryna14 paź 2011 · To get the uniform magnitude same phase matrix, you need to use angle to get the phase, and then separate the phase back into real and imaginary parts. > F_Mag = abs (F); %# has same magnitude as F, 0 phase > F_Phase = cos (angle (F)) + j* (sin (angle (F)); %# has magnitude 1, same phase as F > I_Mag = ifft2 (F_Mag); > … Witryna20 paź 2012 · abs (f)的结果有可能是0,log0的结果就是无穷大了,所以加1就是避免了这种情况。 来自:求助得到的回答 5 评论 举报 xuegt1992 2012-10-20 · 超过14用户采纳过TA的回答 关注 是不是因为F可能取到0,F=0时log (abs (F))没定义。 本回答被网友采纳 6 2012-10-18 matlab中imshow (log (abs (F)+1), [ ... 31 2016-05-11 matlab中y=log … Witrynafigure (4), imshow (log (abs (FF)+1), [ ]);t itle ('频域滤波') H (1: Hh,1: Hw)=0; %滤波器的初值为 0 x0=Hh/2; y0=Hw/2; % 滤波器的中心点 for x=1:Hh for y=1:Hw if (sqrt ( (x- x0)* (x- x0)+ (y-y0)* (y- y0))<30) %理想低通滤波器 D0=30 H (x ,y)=1Βιβλιοθήκη Baidu; end end F=fft2 (x); %二维傅立叶变换 FP=sqrt (real (F).^2+imag (F).^2); %计算傅立叶频 … can allergies cause pharyngitis