[WM]: Vector Quantization vs. Scalar Quantization

[Ram Prasad <ramprasad20005@yahoo.co.in>]

Hello Everyone
 
Can anyone tell the difference between scalar quantization and vector quantization watermarking
 
According to my understanding scalar quantization is where single value of a coeffcient is scaled to represent one watermark bit and
vector quantization is where multiple values are scaled to represent one watermark bit. Am i correct or wrong??????
 
I was reading paper of Peter Meerwald, "Quantization Watermarking in JPEG2000 coding piepline", where the author says for the detial
subbands 256 coefficients are quantized to represent one watermark bit. So i am confused whether it is vector quanitzation or scalar
quantization becuase the algorithm uses uniform scalar quantization with step size delta. 
 
Can anyone please clarity this doubt.
 
Thankyou very much
 
Ram Prasad. 



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