证明了在二维小波子空间上存在一种傅立叶对偶算法,即由φ生成的二维小波子空间V0^-是L^2(0,1)^2到L^2(R^2)的有界可逆线性算子T的值域.通过T扩展L^2((0,1)^2)空间的Riesz基,进而得到V0∈L^2(R^2)空间的采样定理.
It is proved that there exists an analogue of the Fourier duality technique in wavelet subspace. Any wavelet subspace V0 with a generator φ is the range space of a bounded one-to-one linear operator T between L^2 (0,1)^2 and L^2 ( R^2 ). Thus, sampling formulae in V0 are obtained by transforming, via T, expansions in L^2 (0,1 )^2 with respect to some appropriate Riesz bases.