Saturday, 27 February 2016

image processing - 2D DWT computation order


In 2D the discrete wavelet transform (DWT) of an image using lifting based 5/3 filter, if I perform a row-wise operation first then perform column-wise operation then I will get 4 sub-band LL, LH and HL and HH.



  • During reconstruction, that is IDWT, should I maintain the order in reverse direction that is column first and then row?

  • Or any order I can maintain?

  • In JPEG 2000 there is no order information found in the header. Then how I can main the order during reconstruction?





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