detcoef2 - detail coefficient extraction for two dimensional multiple stride fast discrete wavelet decompostion

Calling Sequence

dc=detcoef2(type,c,s,level) or [cH,cV,cD]=detcoef2('all',c,s,level)

Parameters

• type : Detail Coefficient Type
  • 'h': Horizontal Detail
  • 'v': Vertical Detail
  • 'd': Diagonal Detail
• c : Coefficient Bunch Vector
• s : Coefficient Size Matrix
• level : Decompostion Level of the coefficient you want
• dc : Detail Coefficient
• cH : Horizontal Detail Coefficient
• cV : Vertical Detail Coefficient
• cD : Diagonal Detail Coefficient

Description

This function extracts detail coefficents from coefficent bunch vector. Since all the detail coefficients are stored in the coefficient bunch vector, no inverse transform efforts are needed. Hence, the wavelet name and extension method need not to be presented.

Examples

-->img=rand(64,64);
-->[c,s]=wavedec2(img,3,'db2','sp0');
-->[cH1,cV1,cD1]=detcoef2('all',c,s,1);
-->size(cH1)
 ans  =
 
!   33.    33. !

-->cV2=detcoef2('v',c,s,2);            
-->size(cV2)               
 ans  =
 
!   18.    18. !



  

See Also

appcoef ,   detcoef ,   wrcoef ,   appcoef2 ,   wrcoef2