  While the Clifford (geometric) algebra Fourier Transform (CFT) is global, we
introduce here the local Clifford (geometric) algebra (GA) wavelet concept.
  We show how for $n=2,3 (\mod 4)$ continuous $Cl_n$-valued admissible wavelets
can be constructed using the similitude group $SIM(n)$. We strictly aim for
real geometric interpretation, and replace the imaginary unit $i \in \C$
therefore with a GA blade squaring to $-1$. Consequences due to
non-commutativity arise. We express the admissibility condition in terms of a
$Cl_{n}$ CFT and then derive a set of important properties such as dilation,
translation and rotation covariance, a reproducing kernel, and show how to
invert the Clifford wavelet transform. As an explicit example, we introduce
Clifford Gabor wavelets. We further invent a generalized Clifford wavelet
uncertainty principle. Extensions of CFTs and Clifford wavelets to $Cl_{0,n'},
n' = 1,2 (\mod 4)$ appear straight forward.
  Keywords: Clifford geometric algebra, Clifford wavelet transform,
multidimensional wavelets, continuous wavelets, similitude group.
