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1、电子与信息工程实验中心实验报告纸第 27 / 28 页报告成绩：教师签字：批改日期：评语：学生实验报告课程名称数字图像处理姓名XXX实验名称数字图像的FFT变换与DCT 小波变换班级XXXXX实验目的熟悉MATLAB软件完成FFT的现实与计算，图像的FFT变换，DCT变换，小波变换。学号XXXXXXX实验日期XXX实验内容FFT的显示与计算，图像的FFT变换，图像的DCT变换，图像的小波变换实验地点实验组号实验设备PC机 MATLAB软件同组人无1.实验电路及连线本2.程序流程图本3.源程序FFT的显示与计算 f=zeros(256); imshow(f); f(25:225,75:175)=
2、1; figure,imshow(f) F=fft2(f); figure,imshow(F)Warning: Displaying real part of complex input. In imuitoolsprivateimageDisplayValidateParamsvalidateCData at 149 In imuitoolsprivateimageDisplayValidateParams at 31 In imuitoolsprivateimageDisplayParseInputs at 79 In imshow at 199 figure,imshow(F,)Warn
3、ing: Displaying real part of complex input. In imuitoolsprivateimageDisplayValidateParamsvalidateCData at 149 In imuitoolsprivateimageDisplayValidateParams at 31 In imuitoolsprivateimageDisplayParseInputs at 79 In imshow at 199 F_abs=abs(F); figure,imshow(F_abs,) Fc=fftshift(F_abs); figure,imshow(Fc
4、,) S2=log(1+abs(Fc); figure,imshow(S2,) mesh(S2) figure,mesh(Fc) figure,mesh(S2) figure,contour(S2) F_angle=angle(F); figure,imshow(F_angle,) Fa=unwrap(F_angle); figure,imshow(Fa,)2.图像的FFT变换 f=imread(C:Documents and SettingsAdministrator桌面实验图像zelda.bmp); imshow(f); F=fft2(f); figure,imshow(F)Warning
5、: Displaying real part of complex input. In imuitoolsprivateimageDisplayValidateParamsvalidateCData at 149 In imuitoolsprivateimageDisplayValidateParams at 31 In imuitoolsprivateimageDisplayParseInputs at 79 In imshow at 199 F_abs=abs(F); figure,imshow(F_abs) figure,imshow(F_abs,) Fc=fftshift(F_abs)
6、; figure,imshow(Fc,) S2=log(1+abs(Fc); figure,imshow(S2,) F_angle=angle(F); figure,imshow(F_angle,) Fa=unwrap(F_angle); figure,imshow(Fa,) mesh(S2) figure,mesh(S2); figure,contour(S2);3.图像的DCT变换 f=imread(C:UsersmfDesktopzelda.bmp); imshow(f) Fdct=dct2(f); imshow(Fdct) imshow(Fdct,) imshow(abs(Fdct),
7、) imshow(fftshift(abs(Fdct),) S2=log(1+abs(fftshift(abs(Fdct); imshow(S2,) imshow(S2,)4.图像的小波变换 f=imread(C:UsersmfDesktopzelda.bmp); imshow(f) A,B,C,D=dwt2(f,db1); figure,imshow(A) figure,imshow(A,) figure,imshow(B,) figure,imshow(C,) figure,imshow(D,) E=A,B;C,D; figure,imshow(E,) a,b,c,d=dwt2(A,db1); F=a,b;c,d; figure,imshow(F,) G=a,b,c,d;E; figure,imshow(G,)Warning: Image is too big to fit on screen; displaying at 67% In imuitoolsprivateinitSize at 73 In imshow at 2624.结果记录及分析1.FFT的显示与计算2.图像的FFT变换3.图像的DCT变换4.图像的小波变换5.收获感想通过这次实验 更加熟悉了对MATLAB软件的操作和对课程的理解。
