Efficient transform coding of two-channel audio signals by means of complex-valued stereo prediction. - Christian R. Helmrich; Pontus Carlsson; Sascha Disch; Bernd Edler; Johannes Hilpert; Matthias Neusinger; Heiko Purnhagen; Nikolaus Rettelbach; Julien Robilliard; Lars F. Villemoes (ICASSP, 2011)

Improved low-delay MDCT-based coding of both stationary and transient audio signals. - Christian R. Helmrich; Goran Markovic; Bernd Edler (ICASSP, 2014)

Decorrelated innovative codebooks for ACELP using factorization of autocorrelation matrix. - Tom Bäckström; Christian R. Helmrich (INTERSPEECH, 2014)

Low-complexity semi-parametric joint-stereo audio transform coding. - Christian R. Helmrich; Andreas Niedermeier; Stefan Bayer; Bernd Edler (EUSIPCO, 2015)

Harmonic model for MDCT based audio coding with LPC envelope. - Takehiro Moriya; Yutaka Kamamoto; Noboru Harada; Tom Bäckström; Christian R. Helmrich; Guillaume Fuchs (EUSIPCO, 2015)

Arithmetic coding of speech and audio spectra using tcx based on linear predictive spectral envelopes. - Tom Bäckström; Christian R. Helmrich (ICASSP, 2015)

Low delay LPC and MDCT-based audio coding in the EVS codec. - Guillaume Fuchs; Christian R. Helmrich; Goran Markovic; Matthias Neusinger; Emmanuel Ravelli; Takehiro Moriya (ICASSP, 2015)

Spectral envelope reconstruction via IGF for audio transform coding. - Christian R. Helmrich; Andreas Niedermeier; Sascha Disch; Florin Ghido (ICASSP, 2015)

Low-complexity and robust coding mode decision in the EVS coder. - Emmanuel Ravelli; Christian R. Helmrich; Guillaume Fuchs; Markus Multrus (ICASSP, 2015)

Signal-adaptive transform kernel switching for stereo audio coding. - Christian R. Helmrich; Bernd Edler (WASPAA, 2015)

Signal-adaptive switching of overlap ratio in audio transform coding. - Christian R. Helmrich; Bernd Edler (ICASSP, 2016)

Audio Coding Using Overlap and Kernel Adaptation. - Christian R. Helmrich; Bernd Edler (IEEE Signal Process. Lett., 2016)

Efficient Perceptual Audio Coding Using Cosine and Sine Modulated Lapped Transforms. - Christian R. Helmrich (2017)

A Spectrally Adaptive Noise Filling Tool for Perceptual Transform Coding of Still Images. - Christian R. Helmrich; Sebastian Bosse; Paul Keydel; Heiko Schwarz; Detlev Marpe; Thomas Wiegand 001 (ICCE-Berlin, 2018)

Perceptually Optimized Bit-Allocation and Associated Distortion Measure for Block-Based Image or Video Coding. - Christian R. Helmrich; Sebastian Bosse; Mischa Siekmann; Heiko Schwarz; Detlev Marpe; Thomas Wiegand 001 (DCC, 2019)

Neural Network Guided Perceptually Optimized Bit-Allocation for Block-Based Image and Video Compression. - Sebastian Bosse; Michael Dietzel; Sören Becker 001; Christian R. Helmrich; Mischa Siekmann; Heiko Schwarz; Detlev Marpe; Thomas Wiegand 001 (ICIP, 2019)

A Study of the Perceptually Weighted Peak Signal-To-Noise Ratio (WPSNR) for Image Compression. - Johannes Erfurt; Christian R. Helmrich; Sebastian Bosse; Heiko Schwarz; Detlev Marpe; Thomas Wiegand 001 (ICIP, 2019)

Inter-Component Transform for Color Video Coding. - Christian Rudat; Christian R. Helmrich; Jani Lainema; Tung Nguyen 001; Heiko Schwarz; Detlev Marpe; Thomas Wiegand 001 (PCS, 2019)

Xpsnr: A Low-Complexity Extension of The Perceptually Weighted Peak Signal-To-Noise Ratio For High-Resolution Video Quality Assessment. - Christian R. Helmrich; Mischa Siekmann; Sören Becker 001; Sebastian Bosse; Detlev Marpe; Thomas Wiegand 001 (ICASSP, 2020)

Video Compression Using Generalized Binary Partitioning, Trellis Coded Quantization, Perceptually Optimized Encoding, and Advanced Prediction and Transform Coding. - 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 001; Jennifer Rasch; et al. (IEEE Trans. Circuits Syst. Video Technol., 2020)

Vvenc: An Open And Optimized Vvc Encoder Implementation. - 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; et al. (ICME Workshops, 2021)

Visually Optimized Two-Pass Rate Control for Video Coding Using the Low-Complexity XPSNR Model. - Christian R. Helmrich; Ivan Zupancic; Jens Brandenburg; Valeri George; Adam Wieckowski; Benjamin Bross (VCIP, 2021)

Quantization and Entropy Coding in the Versatile Video Coding (VVC) Standard. - Heiko Schwarz; Muhammed Z. Coban; Marta Karczewicz; Tzu-Der Chuang; Frank Bossen; Alexander Alshin; Jani Lainema; Christian R. Helmrich; Thomas Wiegand 001 (IEEE Trans. Circuits Syst. Video Technol., 2021)

A Scene Change and Noise Aware Rate Control Method for VVenC, An Open VVC Encoder Implementation. - Christian R. Helmrich; Christian Bartnik; Jens Brandenburg; Valeri George; Tobias Hinz; Christian Lehmann; Ivan Zupancic; Adam Wieckowski; Benjamin Bross; Detlev Marpe (PCS, 2022)

An Optimized Temporal Filter Implementation for Practical Applications. - Adam Wieckowski; Tobias Hinz; Christian R. Helmrich; Benjamin Bross; Detlev Marpe (PCS, 2022)

Finalization of VVenC's Screen Content Detector and Two-Pass Rate Control Using Pre-Filtering Statistics. - Christian R. Helmrich; Anastasia Henkel; Tobias Hinz; Adam Wieckowski; Benjamin Bross; Detlev Marpe (ICIP, 2023)

All-Intra Rate Control Using Low Complexity Video Features for Versatile Video Coding. - Vignesh V. Menon; Anastasia Henkel; Prajit T. Rajendran; Christian R. Helmrich; Adam Wieckowski; Benjamin Bross; Christian Timmerer; Detlev Marpe (ICIP, 2023)

A Constrained Variable Bit Rate (CVBR) Algorithm for VVenC, an Open VVC Encoder Implementation. - Christian R. Helmrich; Christian Bartnik; Jens Brandenburg; Adam Wieckowski; Benjamin Bross; Detlev Marpe (VCIP, 2023)

Fast Constant-Quality Video Encoding Using VVENC With Rate Capping Based On Pre-Analysis Statistics. - Christian R. Helmrich; Valeri George; Vignesh V. Menon; Adam Wieckowski; Benjamin Bross; Detlev Marpe (ICIP, 2024)

Convex-Hull Estimation using Xpsnr for Versatile Video Coding. - Vignesh V. Menon; Christian R. Helmrich; Adam Wieckowski; Benjamin Bross; Detlev Marpe (ICIP, 2024)

Fast First Pass in Two-Pass Video Encoding Using Sub-Sampling. - Anastasia Henkel; Christian R. Helmrich; Tobias Hinz; Jens Brandenburg; Adam Wieckowski; Benjamin Bross; Detlev Marpe; Thomas Wiegand 001 (PCS, 2024)

Efficient MDCT-Based Multi-Channel Coding with Perceptual Whitening and Broadband ILD Compensation. - Goran Markovic; Eleni Fotopoulou; Jan Frederik Kiene; Christian R. Helmrich (ICASSP, 2025)