4 papers
Image Denoising Using Lower Semi-Frames
Hemalatha M, P. Sam Johnson
A blind image denoising framework based on an infinite directional lower semi-frame (DLSF) is proposed for additive white Gaussian noise. The model employs scale-dependent directio…
Characterization of Frame-Related Sequences on Semi-Hilbert Spaces
Hemalatha M, P. Sam Johnson
Let and be positive bounded operators. We investigate reduced weighted adjoints of densely defined closable operators and use the…
Frame related sequences in tensor product of Hilbert spaces
Hemalatha M
We study frames and related sequences in tensor products of separable Hilbert spaces from an algebraic perspective. For sequences and $\{g_m\…
Direct Sum of Lower Semi-Frames in Hilbert Spaces
Hemalatha M, P. Sam Johnson, Harikrishnan P. K
In this paper, structural properties of lower semi-frames in separable Hilbert spaces are explored with a focus on transformations under linear operators (may be unbounded). Also,…