Two Dimension Approximation Coefficent Reconstruction
A=appcoef(c,s,wname,[N]) A=appcoef(c,s,Lo_R,Hi_R,[N])
appcoef2 is for extraction or reconstruction of approximation coeffient at different level after a multiple level decompostion. Extension mode is stored as a global variable and could be changed with dwtmode. If N is omitted, maximum level approximation will be obtained.
x=rand(100,100); [C,S]=wavedec2(x,3,'db2'); A2=appcoef2(C,S,'db2',2); | ![]() | ![]() |
Roger Liu and Isaac Zhi