%?Set?sampling?period?and?wavelet?name.
delta?=?0.1;?wname?=?‘coif3‘;

%?Set?scales.?
amax?=?7;
a?=?2.^[1:amax];

%?Compute?associated?pseudo-frequencies.
f?=?scal2frq（awnamedelta）;?

%?Compute?associated?pseudo-periods.
per?=?1./f;?

%?Plot?pseudo-periods?versus?scales.
subplot（211）?plot（aper）
title（[‘Wavelet:?‘wname?‘?Sampling?period:?‘num2str（delta）]）
xlabel（‘Scale‘）
ylabel（‘Computed?pseudo-period‘）

%?For?each?scale?2^i:
%?-?generate?a?sine?function?of?period?per（i）;
%?-?perform?a?wavelet?decomposition;
%?-?identify?the?highest?energy?level;
%?-?compute?the?detected?pseudo-period.
for?i?=?1:amax
????%?Generate?sine?function?of?period
????%?per（i）?at?sampling?period?delta.
????t?=?0:delta:100;
????x?=?sin（（t.*2*pi）/per（i））;

????%?Decompose?x?at?level?9.
????[cl]?=?wavedec（x9wname）;

????%?Estimate?standard?deviation?of?detail?coefficients.
????stdc?=?wnoisest（cl[1:amax]）;
????%?Compute?identified?period.
????[yjmax]?=?max（stdc）;
????idper（i）?=?per（jmax）;
end

%?Compare?the?detected?and?computed?pseudo-periods.
subplot（212）?plot（peridper‘o‘perper）
title（‘Detected?vs?computed?pseudo-period‘）
xlabel（‘Computed?pseudo-period‘）
ylabel（‘Detected?pseudo-period‘）?

?屬性????????????大小?????日期????時間???名稱
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?????文件?????229410??2008-12-11?21:13??小波軟閾值的去噪處理代碼\lena.bmp

?????文件????????261??2015-12-15?23:43??小波軟閾值的去噪處理代碼\psnr.mat

?????文件????????195??2015-12-15?23:43??小波軟閾值的去噪處理代碼\psnr_noise_remove.mat

?????文件????????359??2006-04-07?17:57??小波軟閾值的去噪處理代碼\README.txt

?????文件???????1240??2010-05-18?21:24??小波軟閾值的去噪處理代碼\Untitled.m

?????文件????????219??2010-05-18?21:27??小波軟閾值的去噪處理代碼\Untitled2.m

?????文件??????11192??2005-08-25?16:47??小波軟閾值的去噪處理代碼\wavlet.fig

?????文件???????6724??2005-08-25?16:47??小波軟閾值的去噪處理代碼\wavlet.m

?????文件???????6783??2010-05-19?11:46??小波軟閾值的去噪處理代碼\wavlet1.m

?????文件???????6790??2010-05-19?11:36??小波軟閾值的去噪處理代碼\wavletbuild.m

?????文件??????38517??2006-04-07?17:58??小波軟閾值的去噪處理代碼\運行抓圖.jpg

?????目錄??????????0??2010-05-19?11:46??小波軟閾值的去噪處理代碼

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???????????????301690????????????????????12