Discrete Wavelet Transform transformation is split into 4. :
LL = Image data through low-frequency filters, and output image data acquired through the low-frequency filter
.LH = image information through a low-frequency filters, and output image data acquired through high-frequency filter
HL =. Visual information through high-frequency filters, and output image data acquired through the low-frequency filter
.HH = image information through high-frequency filters, and output image data acquired through high-frequency filter
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