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how to convert an image into low frequency and high frequency subbands using DWT

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ashok
ashok 2014년 9월 18일
댓글: ashok 2014년 9월 18일
while using dwt2 it gives 4 sub bands as LL LH HL HH but i need only as Low and High
if we take the LL and HH from dwt2 some of the details are missing how to do in matlab

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Michael scheinfeild
Michael scheinfeild 2014년 9월 18일
[cA,cH,cV,cD] = dwt2(X,'wname')
it gives you the sub bands you need of course it not gives all info if you take only two bands , you can try to filter or threshold http://www.mathworks.com/help/wavelet/ref/dwt2.html
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ashok
ashok 2014년 9월 18일
i think after generate the low and high frequency filter coefficients then multiply with the input image and get the high or low frequency band and subtract with the original to get high freq sub band is there any reference code for that

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