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Dive into the research topics where Henrik Botterweck is active.

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Featured researches published by Henrik Botterweck.


international conference on acoustics, speech, and signal processing | 2001

Anisotropic MAP defined by eigenvoices for large vocabulary continuous speech recognition

Henrik Botterweck

A general method is examined, which unifies the eigenvoice approach and MAP adaptation. The a priori distribution for MAP is chosen to be anisotropic with the eigenvoices as preferred directions while still allowing adaptation into all other directions. This allows the exploitation of a priori knowledge about typical speaker variability within the MAP framework. This approach has two advantages: long term adaptation leads to the same good results as the MAP method, whereas for ultra-short adaptation in the range of 1-2 seconds an overfitting as for maximum likelihood techniques is avoided. The method is applied to large vocabulary continuous speech recognition. Results are to be compared with our transfer of the maximum likelihood eigenvoice method to LVCSR (Botterweck 2000). Even after only one recognized word significant improvements of the WER of up to 6% relative are observed for gender independent recognition. 14% improvements are obtained after 5 seconds.


Archive | 2004

Device and method for adapting the recording parameters of a radiograph

Lothar Spies; Henrik Botterweck; Juergen Weese


Archive | 2004

Reconstruction of local patient doses in computed tomography

Henrik Botterweck; Lothar Spies


Archive | 2001

Speech recognition method

Henrik Botterweck


Archive | 2006

MULTI-CAP DETECTORS FOR NUCLEAR MEDICINE

Herfried Karl Wieczorek; Rolf Bippus; Henrik Botterweck; Andreas Goedicke


Archive | 2009

PRACTICAL SPECT CALIBRATION METHOD FOR QUANTIFICATION OF NUCLIDES WITH HIGH-ENERGY CONTRIBUTIONS

Henrik Botterweck


Archive | 2009

RECONSTRUCTION OF DYNAMICAL CARDIAC SPECT FOR MEASURING TRACER UPTAKE AND REDISTRIBUTION

Henrik Botterweck


Bildverarbeitung für die Medizin | 2010

Monte-Carlo-Based Scatter Correction for Quantitative SPECT Reconstruction.

Rolf Bippus; Andreas Goedicke; Henrik Botterweck


Society of Nuclear Medicine Annual Meeting Abstracts | 2008

Evaluation of simultaneous-multiple-nuclide SPECT with Monte-Carlo (MC) based compensation techniques

Rolf Bippus; Henrik Botterweck; Herfried Wieczorek


Archive | 2006

Pinhole SPECT camera with plural detector heads

Herfried Karl Wieczorek; Rolf Bippus; Henrik Botterweck; Andreas Goedicke

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