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Christian R. Helmrich

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2020 – today

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2024
[c25]
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Anastasia Henkel, Christian R. Helmrich, Tobias Hinz, Jens Brandenburg, Adam Wieckowski, Benjamin Bross, Detlev Marpe, Thomas Wiegand:
Fast First Pass in Two-Pass Video Encoding Using Sub-Sampling. PCS 2024: 1-5
[i2]
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  - journals/corr/abs-2406-13712
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Vignesh V. Menon, Christian R. Helmrich, Adam Wieckowski, Benjamin Bross, Detlev Marpe:
Convex-hull Estimation using XPSNR for Versatile Video Coding. CoRR abs/2406.13712 (2024)
2023
[c24]
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Christian R. Helmrich, Anastasia Henkel, Tobias Hinz, Adam Wieckowski, Benjamin Bross, Detlev Marpe:
Finalization of VVenC's Screen Content Detector and Two-Pass Rate Control Using Pre-Filtering Statistics. ICIP 2023: 1160-1164
[c23]
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Vignesh V. Menon, Anastasia Henkel, Prajit T. Rajendran, Christian R. Helmrich, Adam Wieckowski, Benjamin Bross, Christian Timmerer, Detlev Marpe:
All-Intra Rate Control Using Low Complexity Video Features for Versatile Video Coding. ICIP 2023: 2760-2764
[c22]
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Christian R. Helmrich, Christian Bartnik, Jens Brandenburg, Adam Wieckowski, Benjamin Bross, Detlev Marpe:
A Constrained Variable Bit Rate (CVBR) Algorithm for VVenC, an Open VVC Encoder Implementation. VCIP 2023: 1-5
[i1]
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  - journals/corr/abs-2306-16786
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Vignesh V. Menon, Anastasia Henkel, Prajit T. Rajendran, Christian R. Helmrich, Adam Wieckowski, Benjamin Bross, Christian Timmerer, Detlev Marpe:
All-intra rate control using low complexity video features for Versatile Video Coding. CoRR abs/2306.16786 (2023)
2022
[c21]
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Christian R. Helmrich, Christian Bartnik, Jens Brandenburg, Valeri George, Tobias Hinz, Christian Lehmann, Ivan Zupancic, Adam Wieckowski, Benjamin Bross, Detlev Marpe:
A Scene Change and Noise Aware Rate Control Method for VVenC, An Open VVC Encoder Implementation. PCS 2022: 241-245
[c20]
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Adam Wieckowski, Tobias Hinz, Christian R. Helmrich, Benjamin Bross, Detlev Marpe:
An Optimized Temporal Filter Implementation for Practical Applications. PCS 2022: 247-251
2021
[j3]
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  - journals/tcsv/SchwarzCKCBALHW21
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Heiko Schwarz, Muhammed Z. Coban, Marta Karczewicz, Tzu-Der Chuang, Frank Bossen, Alexander Alshin, Jani Lainema, Christian R. Helmrich, Thomas Wiegand:
Quantization and Entropy Coding in the Versatile Video Coding (VVC) Standard. IEEE Trans. Circuits Syst. Video Technol. 31(10): 3891-3906 (2021)
[c19]
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Adam Wieckowski, Jens Brandenburg, Tobias Hinz, Christian Bartnik, Valeri George, Gabriel Hege, Christian R. Helmrich, Anastasia Henkel, Christian Lehmann, Christian Stoffers, Ivan Zupancic, Benjamin Bross, Detlev Marpe:
Vvenc: An Open And Optimized Vvc Encoder Implementation. ICME Workshops 2021: 1-2
[c18]
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Christian R. Helmrich, Ivan Zupancic, Jens Brandenburg, Valeri George, Adam Wieckowski, Benjamin Bross:
Visually Optimized Two-Pass Rate Control for Video Coding Using the Low-Complexity XPSNR Model. VCIP 2021: 1-5
2020
[j2]
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Jonathan Pfaff, Heiko Schwarz, Detlev Marpe, Benjamin Bross, Santiago De-Luxán-Hernández, Philipp Helle, Christian R. Helmrich, Tobias Hinz, Wang-Q Lim, Jackie Ma, Tung Nguyen, Jennifer Rasch, Michael Schäfer, Mischa Siekmann, Gayathri Venugopal, Adam Wieckowski, Martin Winken, Thomas Wiegand:
Video Compression Using Generalized Binary Partitioning, Trellis Coded Quantization, Perceptually Optimized Encoding, and Advanced Prediction and Transform Coding. IEEE Trans. Circuits Syst. Video Technol. 30(5): 1281-1295 (2020)
[c17]
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Christian R. Helmrich, Mischa Siekmann, Sören Becker, Sebastian Bosse, Detlev Marpe, Thomas Wiegand:
Xpsnr: A Low-Complexity Extension of The Perceptually Weighted Peak Signal-To-Noise Ratio For High-Resolution Video Quality Assessment. ICASSP 2020: 2727-2731

2010 – 2019

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2019
[c16]
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Christian R. Helmrich, Sebastian Bosse, Mischa Siekmann, Heiko Schwarz, Detlev Marpe, Thomas Wiegand:
Perceptually Optimized Bit-Allocation and Associated Distortion Measure for Block-Based Image or Video Coding. DCC 2019: 172-181
[c15]
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Sebastian Bosse, Michael Dietzel, Sören Becker, Christian R. Helmrich, Mischa Siekmann, Heiko Schwarz, Detlev Marpe, Thomas Wiegand:
Neural Network Guided Perceptually Optimized Bit-Allocation for Block-Based Image and Video Compression. ICIP 2019: 126-130
[c14]
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Johannes Erfurt, Christian R. Helmrich, Sebastian Bosse, Heiko Schwarz, Detlev Marpe, Thomas Wiegand:
A Study of the Perceptually Weighted Peak Signal-To-Noise Ratio (WPSNR) for Image Compression. ICIP 2019: 2339-2343
[c13]
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Christian Rudat, Christian R. Helmrich, Jani Lainema, Tung Nguyen, Heiko Schwarz, Detlev Marpe, Thomas Wiegand:
Inter-Component Transform for Color Video Coding. PCS 2019: 1-5
2018
[c12]
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Christian R. Helmrich, Sebastian Bosse, Paul Keydel, Heiko Schwarz, Detlev Marpe, Thomas Wiegand:
A Spectrally Adaptive Noise Filling Tool for Perceptual Transform Coding of Still Images. ICCE-Berlin 2018: 1-6
2017
[b1]
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  - phd/dnb/Helmrich17
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Christian R. Helmrich:
Efficient Perceptual Audio Coding Using Cosine and Sine Modulated Lapped Transforms. University of Erlangen-Nuremberg, Germany, 2017
2016
[j1]
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Christian R. Helmrich, Bernd Edler:
Audio Coding Using Overlap and Kernel Adaptation. IEEE Signal Process. Lett. 23(5): 590-594 (2016)
[c11]
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Christian R. Helmrich, Bernd Edler:
Signal-adaptive switching of overlap ratio in audio transform coding. ICASSP 2016: 639-643
2015
[c10]
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Takehiro Moriya, Yutaka Kamamoto, Noboru Harada, Tom Bäckström, Christian R. Helmrich, Guillaume Fuchs:
Harmonic model for MDCT based audio coding with LPC envelope. EUSIPCO 2015: 789-793
[c9]
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Christian R. Helmrich, Andreas Niedermeier, Stefan Bayer, Bernd Edler:
Low-complexity semi-parametric joint-stereo audio transform coding. EUSIPCO 2015: 794-798
[c8]
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Christian R. Helmrich, Andreas Niedermeier, Sascha Disch, Florin Ghido:
Spectral envelope reconstruction via IGF for audio transform coding. ICASSP 2015: 389-393
[c7]
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Tom Bäckström, Christian R. Helmrich:
Arithmetic coding of speech and audio spectra using tcx based on linear predictive spectral envelopes. ICASSP 2015: 5127-5131
[c6]
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Guillaume Fuchs, Christian R. Helmrich, Goran Markovic, Matthias Neusinger, Emmanuel Ravelli, Takehiro Moriya:
Low delay LPC and MDCT-based audio coding in the EVS codec. ICASSP 2015: 5723-5727
[c5]
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Emmanuel Ravelli, Christian R. Helmrich, Guillaume Fuchs, Markus Multrus:
Low-complexity and robust coding mode decision in the EVS coder. ICASSP 2015: 5888-5892
[c4]
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Christian R. Helmrich, Bernd Edler:
Signal-adaptive transform kernel switching for stereo audio coding. WASPAA 2015: 1-5
2014
[c3]
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Christian R. Helmrich, Goran Markovic, Bernd Edler:
Improved low-delay MDCT-based coding of both stationary and transient audio signals. ICASSP 2014: 6954-6958
[c2]
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  - conf/interspeech/BackstromH14
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Tom Bäckström, Christian R. Helmrich:
Decorrelated innovative codebooks for ACELP using factorization of autocorrelation matrix. INTERSPEECH 2014: 2794-2798
2011
[c1]
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Christian R. Helmrich, Pontus Carlsson, Sascha Disch, Bernd Edler, Johannes Hilpert, Matthias Neusinger, Heiko Purnhagen, Nikolaus Rettelbach, Julien Robilliard, Lars F. Villemoes:
Efficient transform coding of two-channel audio signals by means of complex-valued stereo prediction. ICASSP 2011: 497-500

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