[Mp4-tech] Why only low frequeny is considered in DCT?

[prabhakar]

 It is possible to reconstruct an approximate copy of the block from the low frequency coefficients. Adding more coefficients produces more accurate reconstruction of the original block.
Thanks & Regards
---------------------------------
P. Prabhakar
Digital Video Group
GDA Technologies Ltd 
32 & 46 North Phase 
Thiru Ve Ka Industrial Estate 
Ekkatuthangal 
Chennai - 600 097 India 
Email: prabhakar.pasunuti gdatech.co.in
Mobile: 09840517282
Office : 044-30613429
  ----- Original Message ----- 
  From: sagar 
  To: mp4-tech lists.mpegif.org 
  Sent: Thursday, November 23, 2023 10:56 AM
  Subject: [Mp4-tech] Why only low frequeny is considered in DCT?
  Hi Xperts,
  I wanted to know when we do DCT ( video preocessing), we only consider the Low frequency elements. Why? 
  DCT is used for taking out spatial reduncies, and DCT is basically used to decorrelate energy in the image.
  And other fact being low frequency contains high energy, 
  If anybody could answer my question, i would be thankful.
  Warm Regards,
  Sagar
    -----Original Message-----
    From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org]On Behalf Of Luo Daniel
    Sent: Wednesday, November 22, 2023 8:26 PM
    To: mp4-tech lists.mpegif.org
    Cc: Luo Daniel
    Subject: [Mp4-tech] Transport stream analyer
    Dear all,
    Do you know if there is any free software TS analyzer that can perform buffer verification?
    Thanks!
    Jiancong Luo
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