Hi, I am a bit confused on why there are intra-coded
MacroBlocks on a P(predicted)-VOPs. I assumed that all
MBs of a P-VOP are inter-MBs. When to code a MB of a
P-VOP as intra-MB?
Thanks,
Dok
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Reply by Rumit Thakur●July 2, 20042004-07-02
Hi Dok,
For error resilience i.e if there are 5 frames then lets say 4th is
predicted from 3rd and 3rd from 2nd..
then if there is error(due to transform mismatch ,inaccurate
prediction.. )then that error will be propogated.
By having Intra we can have check on that as it predicts from the same
frame.
also There is a cost function which decides whether a MB is to be coded
as Intra or P
for P VOPs..The cost function can favour Intra if the bits required are
less and the clarity given is more
than P Vop..typically in fast motion areas..
regards
rumit
Typically
Dok wrote:
Hi, I am a bit confused on why there are intra-coded
MacroBlocks on a P(predicted)-VOPs. I assumed that all
MBs of a P-VOP are inter-MBs. When to code a MB of a
P-VOP as intra-MB?
Thanks,
Dok
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If the cost of coding a particular MB in
inter mode is higher than in intra mode, the MB will be coded as Intra to save
bits. Also this can be used as an error-resilience technique. Hope this
helps.
Ganesh
----- Original Message -----
From: Dok
To: i...@yahoogroups.com
Sent: Friday, July 02, 2004 1:16 PM
Subject: [imagedsp] (MPEG4) intra-MBs in P-VOP
Hi, I am a bit confused on why there are intra-coded MacroBlocks on a P(predicted)-VOPs. I assumed that all MBs of a P-VOP are
inter-MBs. When to code a MB of a P-VOP as intra-MB?
Thanks, Dok
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