DWT is an algorithm used to reduce dimensionality of an image, feature extraction process. DWT algorithm decomposes the image into 4 sub-band (sub-image) ie,LL,LH,HL,HH.
I Have an Image I am practicing on (cameraman.tif) , and I decomposed it 3 times on the LL subband (I have LL1, LL2 and LL3). Apprently you can extract features from an decomposed image. But I dont know what features i could extract from an image and also and more importantly HOW TO EXTRAXT the features from the image....Can anyone explain?