ecodis
efficient coding of digital signals

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 by C. Helmrich

About the project initiator

    ecodis :: Short Biography

portrait of Christian R. Helmrich, 2011

Christian R. Helmrich, born in 1981 in Cuxhaven, Germany, received a B. Sc. degree in computer science from
link to external web page Capitol Technology University (formerly Capitol College), Laurel, MD, USA, in 2005 and a M. Sc. degree in information & media technology from
link to external web page TU Hamburg-Harburg (TUHH), Germany, in 2008. Between 2008 and 2013 he worked on numerous speech and audio coding solutions at the
link to external web page Fraunhofer Institute for Integ­rated Circuits (IIS), Erlangen, Ger­many, partly as a Senior Engineer. From 2013 until 2016 Mr. Helmrich continued his work as a research assistant at the link to external web page Audio Labs Erlangen, a joint institution of Fraunhofer IIS and the link to external web page University of Erlangen-Nürnberg, Germany, where he completed his Dr.-Ing. degree with a link to document dissertation on audio signal analysis and coding. In 2016 Dr. Helmrich joined the Video Coding & Analytics department of the
link to external web page Fraunhofer Heinrich Hertz Insti­tute (HHI), Berlin, Germany, as a next-generation video coding researcher and developer. His main interests include audio and video acquisition, coding, storage, and preservation as well as restoration from analog sources.

Dr. Helmrich participated in and contribu­ted to several standardization activities in the fields of audio and video coding. He is author or co-author of more than 40 publications and a Senior Member of the link to external web page IEEE. He is also on link to external web page LinkedIn.



Christian Helmrich's publications in chronologically descending order, 2021–2007

 2021

A. Wieckowski, J. Brandenburg, C. Bartnik, V. George, J. Güther, G. Hege, C. R. Helmrich, A. Henkel, T. Hinz, C. Lehmann, C. Stoffers, I. Zupancic, B. Bross, H. Schwarz, and D. Marpe, «Update on open, optimized VVC implementations VVenC and VVdeC», document JVET-U0135, Teleconference, Jan. 2021. link to document Zip file (link to document July update).

C. R. Helmrich, B. Bross, J. Pfaff, H. Schwarz, D. Marpe, and T. Wiegand, «Information on and analysis of the VVC encoders in the SDR HD RA verification test», document JVET-W0150, Teleconference, July 2021. link to document Zip file.

B. Bross, A. Wieckowski, and C. R. Helmrich, «Versatile Video Coding – Open Optimized Implementations», workshop 4, in Proc. IEEE Picture Coding Symposium (PCS), online, July 2021. link to external web page Video recording on YouTube.

A. Wieckowski, J. Brandenburg, T. Hinz, C. Bartnik, V. George, G. Hege, C. R. Helmrich, A. Henkel, C. Lehmann, C. Stoffers, I. Zupancic, B. Bross, and D. Marpe, «VVenC: An Open and Optimized VVC Encoder Implementation», link to external web page best open source project award, in Proc. IEEE Int. Conf. Multimedia & Expo (ICME), online, July 2021. link to external web page Paper.

H. Schwarz, M. Coban, M. Karczewicz, T.-D. Chuang, F. Bossen, A. Alshin, J. Lainema, C. R. Helmrich, and T. Wiegand, «Quantization and Entropy Coding in the Versatile Video Coding (VVC) Standard», IEEE Trans. on Circuits and Systems for Video Technology, vol. 31, no. 10, pp. 3891–3906, Oct. 2021. link to document Article manuscript (Feb. '21), link to external web page article.

C. R. Helmrich, I. Zupancic, J. Brandenburg, V. George, A. Wieckowski, and B. Bross, «Visually Optimized Two-Pass Rate Control for Video Coding Using the Low-Complexity XPSNR Model», in Proc. IEEE Int. Conf. Visual Communications and Image Processing (VCIP), Munich, Dec. 2021. link to document Paper manuscript, link to document conference poster, link to sub-page web page.

 2020

W. Lim, C. R. Helmrich, J. Erfurt, H. Schwarz, D. Marpe, and T. Wiegand, «Pre-Sample Adaptive Offset Filter», document JVET-Q0434, Brussels, Jan. 2020. link to document Zip file.

C. R. Helmrich, M. Siekmann, S. Becker, S. Bosse, D. Marpe, and T. Wiegand, «XPSNR: A Low-Complexity Extension of the Perceptually Weighted Peak Signal-to-Noise Ratio for High-Resolution Video Quality Assessment», in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (ICASSP), virt/online, May 2020. link to document Paper manuscript, link to external web page paper, link to sub-page web page.

C. R. Helmrich, S. Bosse, H. Schwarz, D. Marpe, and T. Wiegand, «A Study of the Extended Perceptually Weighted Peak Signal-to-Noise Ratio (XPSNR) for Video Com­pression with Different Resolutions and Bit Depths», ITU Journal: ICT Dis­coveries – Special Issue: The Future of Video and Immersive Media, vol. 3, no. 1, online, May 2020. link to document Article manuscript, link to external web page article, link to sub-page web page.

J. Pfaff, H. Schwarz, D. Marpe, B. Bross, S. De-Luxán-Hernández, P. Helle, C. R. Helmrich, T. Hinz, W.-Q. Lim, J. Ma, T. Nguyen, J. Rasch, M. Schäfer, M. Siekmann, G. Venugopal, A. Wieckowski, M. Winken, and T. Wiegand, «Video Compression Using Generalized Binary Partitioning, Trellis Coded Quantization, Perceptually Optimized Encoding, and Advanced Prediction and Transform Coding», IEEE Trans. on Circuits and Systems for Video Techno­logy, vol. 30, no. 5, pp. 1281–1295, May 2020. link to document Article manuscript (with different title), link to external web page article.

C. R. Helmrich, «Crosscheck of JVET-S0180 (Addition of a GOP hierarchy of 32 for random access configuration for VTM)», document JVET-S0262, Teleconference, June 2020. link to document Zip file.

A. Wieckowski, J. Brandenburg, C. Bartnik, V. George, J. Güther, G. Hege, C. Helmrich, A. Henkel, T. Hinz, C. Lehmann, C. Stoffers, I. Zupancic, B. Bross, H. Schwarz, and D. Marpe, «Open optimized VVC encoder (VVenC) and decoder (VVdeC) implementations», document JVET-T0099, Teleconference, Oct. 2020. link to document Zip file.

C. R. Helmrich, B. Bross, J. Pfaff, H. Schwarz, D. Marpe, and T. Wiegand, «Information on and analysis of the VVC encoders in the SDR UHD verification test», document JVET-T0103, Teleconference, Oct. 2020. link to document Zip file.

 2019

C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wiegand, «Clean-up and Finalization of Per­ceptually Optimized QP Adaptation Method in VTM», document JVET-M0091, Marra­kech, Jan. 2019. link to document Zip file.

C. R. Helmrich and B. Bross, «CE11: Very Strong Deblocking with Conditional Activation Signaling (Test 11.1.1)», document JVET-M0092, Marra­kech, Jan. 2019. link to document Zip file.

C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wiegand, «Non-CE3: Improved Robust­ness for Calculation of Cross-Component Linear Model Parameters», document JVET-M0093, Marrakech, Jan. 2019. link to document Zip file.

C. R. Helmrich, S. Bosse, M. Siekmann, H. Schwarz, D. Marpe, and T. Wiegand, «Per­cep­tually Optimized Bit-Allocation and Associated Distortion Measure for Block-Based Image or Video Coding», in Proc. IEEE Data Compression Conf. (DCC), Snowbird, pp. 172–181, Mar. 2019. link to document Paper manuscript, link to external web page paper, link to sub-page web page.

C. R. Helmrich, C. Rudat, T. Nguyen, H. Schwarz, D. Marpe, and T. Wiegand, «CE7-related: Joint Chroma Residual Coding with Multiple Modes», document JVET-N0282, Geneva, Mar. 2019. link to document Zip file.

C. R. Helmrich, H. Schwarz, T. Nguyen, C. Rudat, D. Marpe, and T. Wiegand, «CE7: Joint Chroma Residual Coding with Multiple Modes (Tests CE7-2.1, CE7-2.2)», document JVET-O0105, Gothenburg, July 2019. link to document Zip file.

C. R. Helmrich, H. Schwarz, T. Nguyen, C. Rudat, D. Marpe, and T. Wiegand, «CE7-related: Alternative Configuration for Joint Chroma Residual Coding», document JVET-O0543, Gothenburg, July 2019. link to document Zip file.

J. Erfurt, C. R. Helmrich, S. Bosse, H. Schwarz, D. Marpe, and T. Wiegand, «A Study of the Perceptually Weighted Peak Signal-to-Noise Ratio (WPSNR) for Image Compressi­on», in Proc. IEEE International Conf. Image Processing (ICIP), Taipei, pp. 2339–2343, Sep. 2019. link to document Paper manuscript, link to external web page paper, link to sub-page web page.

S. Bosse, M. Dietzel, S. Becker, C. R. Helmrich, M. Siekmann, H. Schwarz, D. Marpe, and T. Wiegand, «Neural Network Guided Perceptually Optimized Bit-Allocation for Block-Based Image and Video Compression», in Proc. IEEE Int. Conf. Image Processing (ICIP), Taipei, pp. 126–130, Sep. 2019. link to external web page Paper.

C. Rudat, C. R. Helmrich, J. Lainema, T. Nguyen, H. Schwarz, D. Marpe, and T. Wiegand, «Inter-Component Transform for Color Video Coding», in Proc. IEEE Picture Coding Symposium (PCS), Ningbo, Nov. 2019. link to document Paper manuscript, link to external web page paper.

 2018

C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wiegand, «Improved Perceptually Optimized QP Adaptation and Associated Distortion Measure», document JVET-K0206, Ljubljana, July 2018. link to document Zip file.

C. R. Helmrich, S. Bosse, P. Keydel, H. Schwarz, D. Marpe, and T. Wiegand, «A Spec­trally Adaptive Noise Filling Tool for Perceptual Transform Coding of Still Images», in Proc. IEEE Int. Conf. Consumer Electron. (ICCE), Berlin, Sep. 2018. link to document Paper manuscript, link to external web page paper, link to sub-page web page.

C. R. Helmrich, B. Bross, and J. Erfurt, «AHG10: Corrected Operation of ALF Encoding with Perceptually Optimized QP Adaptation», document JVET-L0181, Macau, Oct. 2018. link to document Zip file.

C. R. Helmrich, «CE7: Adaptive Quantization via Perceptually Optimized QP Adaptation (Test 7.2.6)», document JVET-L0210, Macau, Oct. 2018. link to document Zip file.

C. R. Helmrich and B. Bross, «Very Strong Deblocking Filtering with Conditional Acti­vation Signaling», document JVET-L0523, Macau, Oct. 2018. link to document Zip file.

 2017

C. R. Helmrich, Efficient Perceptual Audio Coding Using Cosine and Sine Modulated Lapped Transforms, Dr.-Ing. dissertation, Friedrich-Alexander-Universität Erlangen-Nürnberg, May 2017. link to document Third edition (Nov. 2017).

S. Bosse, C. R. Helmrich, H. Schwarz, D. Marpe, and T. Wiegand, «Perceptually Optimized QP Adaptation and Associated Distortion Measure», document JVET-H0047, Macau, Oct. 2017. link to document Zip file (Dec. 2017).

 2016

C. R. Helmrich and B. Edler, «Signal-Adaptive Switching of Overlap Ratio in Audio Transform Coding», in Proc. IEEE Int. Conf. Acoustics, Speech, and Signal Processing (ICASSP), Shanghai, pp. 639–643, Mar. 2016. link to external web page Paper.

C. R. Helmrich and B. Edler, «Audio Coding Using Overlap and Kernel Adaptation», IEEE Signal Processing Letters, vol. 23, no. 5, pp. 590–594, May 2016. link to document Article manuscript, link to external web page article.

C. R. Helmrich, R. Füg, and B. Edler, «Frequency-Domain Prediction for Audio Coding», submitted to IEEE Signal Processing Letters, Aug. 2016. link to document Article manuscript.

F. Schuh, S. Dick, R. Füg, C. R. Helmrich, N. Rettelbach, and T. Schwegler, «Efficient Multichannel Audio Transform Coding with Low Delay and Complexity», in Proc. AES 141st Convention, Los Angeles, preprint 9660, Oct. 2016. link to external web page Paper.

S. Disch, A. Niedermeier, C. R. Helmrich, C. Neukam, K. Schmidt, R. Geiger, J. Le­comte, F. Ghido, F. Nagel, and B. Edler, «Intelligent Gap Filling in Perceptual Transform Coding of Audio», in Proc. AES 141st Convention, Los Angeles, preprint 9661, Oct. 2016. link to external web page Paper.

 2015

C. Helmrich, A. Niedermeier, S. Disch, and F. Ghido, «Spectral Envelope Reconstruction via IGF for Audio Transform Coding», in Proc. IEEE ICASSP, Brisbane, pp. 389–393, Apr. 2015. link to external web page Paper.

T. Bäckström and C. R. Helmrich, «Arithmetic Coding of Speech and Audio Spectra Using TCX Based on Linear Predictive Spectral Envelopes», in Proc. IEEE ICASSP, Brisbane, pp. 5127–5131, Apr. 2015. link to external web page Paper.

G. Fuchs, C. R. Helmrich, G. Marković, M. Neusinger, E. Ravelli, and T. Moriya, «Low Delay LPC and MDCT-Based Audio Coding in the EVS Codec», in Proc. IEEE ICASSP, Brisbane, pp. 5723–5727, Apr. 2015. link to external web page Paper.

E. Ravelli, C. R. Helmrich, G. Fuchs, and M. Multrus, «Low-Complexity and Robust Cod­ing Mode Decision in the EVS Coder», in Proc. IEEE ICASSP, Brisbane, pp. 5888–5892, Apr. 2015. link to external web page Paper.

T. Moriya, Y. Kamamoto, N. Harada, T. Bäckström, C. R. Helmrich, and G. Fuchs, «Harmonic Model for MDCT Based Audio Coding with LPC Envelope», in Proc. EURASIP 23rd EUSIPCO, Nice, pp. 794–798, Sep. 2015. link to document Paper.

C. R. Helmrich, A. Niedermeier, S. Bayer, and B. Edler, «Low-Complexity Semi-Para­metric Joint-Stereo Audio Transform Coding», in Proc. EURASIP 23rd EUSIPCO, Nice, pp. 799–803, Sep. 2015. link to document Paper.

C. R. Helmrich and B. Edler, «Signal-Adaptive Transform Kernel Switching for Stereo Audio Coding», in Proc. IEEE Workshop on Applic. of Signal Processing to Audio and Acoustics (WASPAA), New Paltz, pp. 1–5, Oct. 2015. link to external web page Paper.

C. R. Helmrich and M. Fischer, «Low-Delay Transform Coding Using the MPEG-H Audio Codec», in Proc. AES 139th Convention, New York, preprint 9355, Oct. 2015. link to external web page Paper.

 2014

C. R. Helmrich, G. Marković, and B. Edler, «Improved Low-Delay MDCT-Based Coding of Both Stationary and Transient Audio Signals», in Proc. IEEE ICASSP, Florence, Italy, pp. 6954–6958, May 2014. link to external web page Paper.

 2013

M. Neuendorf, M. Multrus, N. Rettelbach, G. Fuchs, J. Robilliard, J. Lecomte, S. Wilde, S. Bayer, S. Disch, C. R. Helmrich, R. Lefebvre, P. Gournay, B. Bessette, J. Lapierre, K. Kjörling, H. Purnhagen, L. Villemoes, W. Oomen, E. Schuijers, K. Kikuiri, T. Chinen, T. Norimatsu, K.-S. Chong, E. Oh, M. Kim, S. Quackenbush, and B. Grill, «The ISO/MPEG Unified Speech and Audio Coding Standard—Consistent High Quality for All Content Types and at All Bitrates», Journal of the AES, vol. 61, no. 12, pp. 956–977, Dec. 2013. link to document Article manuscript (hosted by P. Gournay), link to external web page article.

 2012

M. Neuendorf, M. Multrus, N. Rettelbach, G. Fuchs, J. Robilliard, J. Lecomte, S. Wilde, S. Bayer, S. Disch, C. R. Helmrich, R. Lefebvre, P. Gournay, B. Bessette, J. Lapierre, K. Kjörling, H. Purnhagen, L. Villemoes, W. Oomen, E. Schuijers, K. Kikuiri, T. Chinen, T. Norimatsu, K.-S. Chong, E. Oh, M. Kim, S. Quackenbush, and B. Grill, «MPEG Unified Speech and Audio Coding—The ISO/MPEG Standard for High-Efficiency Audio Coding of All Content Types», in Proc. AES 132nd Convention, Budapest, preprint 8654, Apr. 2012. link to external web page Paper.

 2011

C. R. Helmrich, P. Carlsson, S. Disch, B. Edler, J. Hilpert, M. Neusinger, H. Purnhagen, N. Rettelbach, J. Robilliard, and L. Villemoes, «Efficient Transform Coding of Two-Channel Audio Signals by Means of Complex-Valued Stereo Prediction», in Proc. IEEE ICASSP, Prague, pp. 497–500, May 2011. link to document Paper.

 2010

C. R. Helmrich, «On the Use of Sums of Sines in the Design of Signal Windows», in Proc. DAFx-10, Graz, poster session 8, Sep. 2010. link to document Paper.

 2008

M. Holters, C. R. Helmrich, and U. Zölzer, «Delay-Free Audio Coding Based on ADPCM and Error Feedback», in Proc. DAFx-08, Espoo, paper session 2d, Sep. 2008. link to document Paper.

 2007

C. R. Helmrich, M. Holters, and U. Zölzer, «Improved Psychoacoustic Noise Shaping for Requantization of High-Resolution Digital Audio», in Proc. AES 31st Int. Conf., London, June 2007. link to external web page Paper.

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