wp1=0.3*pi;wp2=0.6*pi;ws1=0.4*pi;ws2=0.5*pi;Ap=3;As=10;Fs=1;
B=ws2-ws1;w0=sqrt(ws1*ws2);
wp=max(abs(wp1),abs(wp2));ws=1;
[N,wc]=buttord(wp,ws,Ap,As,'s');
[num,den]=butter(N,wc,'s');
[numt,dent]=lp2bs(num,den,w0,B);
[numd,dend]=bilinear(numt,dent,Fs);
w=linspace(0,pi,512);
h=freqz(numd,dend,w);
norm=max(abs(h));
numd=numd/norm;
subplot(2,2,1);
plot(w/pi,20*log(abs(h)/norm));grid;
xlabel('Butterworth BS DF');
ylabel('Gain,dB');
wp1=0.3*pi;wp2=0.6*pi;ws1=0.4*pi;ws2=0.5*pi;Ap=3;As=10;Fs=1;
B=ws2-ws1;w0=sqrt(ws1*ws2);
wp=max(abs(wp1),abs(wp2));ws=1;
[N,wc]=cheb1ord(wp,ws,Ap,As,'s');
[num,den]=cheby1(N,Ap,wc,'s');
[numt,dent]=lp2bs(num,den,w0,B);
[numd,dend]=bilinear(numt,dent,Fs);
w=linspace(0,pi,512);
h=freqz(numd,dend,w);
norm=max(abs(h));
numd=numd/norm;
subplot(2,2,2);
plot(w/pi,20*log(abs(h)/norm));grid;
xlabel('ChebyshevI BS DF');
ylabel('Gain,dB');
wp1=0.3*pi;wp2=0.6*pi;ws1=0.4*pi;ws2=0.5*pi;Ap=3;As=10;Fs=1;
B=ws2-ws1;w0=sqrt(ws1*ws2);
wp=max(abs(wp1),abs(wp2));ws=1;
[N,wc]=cheb2ord(wp,ws,Ap,As,'s');
[num,den]=cheby2(N,As,wc,'s');
[numt,dent]=lp2bs(num,den,w0,B);
[numd,dend]=bilinear(numt,dent,Fs);
w=linspace(0,pi,512);
h=freqz(numd,dend,w);
norm=max(abs(h));
numd=numd/norm;
subplot(2,2,3);
plot(w/pi,20*log(abs(h)/norm));grid;
xlabel('ChebyshevII BS DF');
ylabel('Gain,dB');
wp1=0.3*pi;wp2=0.6*pi;ws1=0.4*pi;ws2=0.5*pi;Ap=3;As=10;Fs=1;
B=ws2-ws1;w0=sqrt(ws1*ws2);
wp=max(abs(wp1),abs(wp2));ws=1;
[N,wc]=ellipord(wp,ws,Ap,As,'s');
[num,den]=ellip(N,Ap,As,wc,'s');
[numt,dent]=lp2bs(num,den,w0,B);
[numd,dend]=bilinear(numt,dent,Fs);
w=linspace(0,pi,512);
h=freqz(numd,dend,w);
norm=max(abs(h));
numd=numd/norm;
subplot(2,2,4);
plot(w/pi,20*log(abs(h)/norm));grid;
xlabel('Tuoyuan BS DF');
ylabel('Gain,dB');
imresize函数直接可以实现的
假如你有一张放在D盘跟目录下的图片tu.jpg
I=imread('D:\1.jpg');
figure, imshow(I);
A=imresize(I,2,'nearest');%2代表放大两倍，你可自行该其他数字，‘nearest’是最近邻插值
figure, imshow(A);
wp1=0.3*pi;wp2=0.6*pi;ws1=0.4*pi;ws2=0.5*pi;Ap=3;As=10;Fs=1; B=ws2-ws1;w0=sqrt(ws1*ws2); wp=max(abs(wp1),abs(wp2));ws=1; [N,wc]=buttord(wp,ws,Ap,As,'s'); [num,den]=butter(N,wc,'s'); [numt,dent]=lp2bs(num,den,w0,B); [numd,dend]=...
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