Spektrale Betragsschätzung als Methode zur Rauschunterdrückung in Röntgenbildern

Aach, Til; Kunz, Dietmar

doi:10.1007/978-3-642-60893-3_60

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2008

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“…Therefore, lapped transforms as the modulated lapped transform (MLT) and the lapped orthogonal transform (LOT) have been developed [6], [20]- [23]. The MLT was used for spectral amplitude estimation [24]. As for all real-valued separable transforms, also for the MLT, the modulus response does not change if the orientation of an image structure is mirrored.…”

Section: Introductionmentioning

confidence: 99%

An Orientation-Selective Orthogonal Lapped Transform

Kunz

2008

IEEE Trans. on Image Process.

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A novel critically sampled orientation-selective orthogonal lapped transform called the lapped Hartley transform (LHT) is derived. In a first step, overlapping basis functions are generated by modulating basis functions of a 2-D block Hartley transform by a cosine wave. To achieve invertibility and orthogonality, an iterative filter is applied as prefilter in the analysis and as postfilter in the synthesis operation, respectively. Alternatively, filtering can be restricted to analysis or synthesis, ending up with a biorthogonal transform (LHT-PR, LHT-PO). A statistical analysis based on a 4000-image data base shows that the LHT and LHT-PO have better redundancy removal properties than other block or lapped transforms. Finally, image compression and noise removal examples are given, showing the advantages of the LHT especially in images containing oriented textures.

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Section: Introductionmentioning

confidence: 99%

An Orientation-Selective Orthogonal Lapped Transform

Kunz

2008

IEEE Trans. on Image Process.

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show abstract

Spektrale Betragsschätzung als Methode zur Rauschunterdrückung in Röntgenbildern

Cited by 1 publication

References 9 publications

An Orientation-Selective Orthogonal Lapped Transform

An Orientation-Selective Orthogonal Lapped Transform

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