Ya Chen

Title: Innovations by Ya Chen in Optical Flow and Video Coding

Introduction

Ya Chen, a prolific inventor based in Cesson-Sevigne, France, holds a remarkable portfolio of 29 patents. His work primarily focuses on advancements in optical flow models and video coding techniques, contributing significantly to the fields of computer vision and video compression.

Latest Patents

Among his latest innovations, Ya Chen has developed two noteworthy patents: Bi-prediction refinement in affine with optical flow - PROF and BDOF - Bi-directional Optical Flow. These patents utilize optical flow models to enhance sample-wise motion compensation refinement. In BDOF, an extended region is generated around a block to be coded to calculate spatial gradients efficiently. This method incorporates padding operations, using samples from nearby integer neighbors in reference pictures. The combination of BDOF and PROF allows for optimized sub-block based affine motion-compensated predictions, where BDOF can be applied after the generation of new prediction blocks by PROF, or it can leverage spatial gradients in original prediction blocks to streamline computations.

Another significant development is in hybrid texture particle coding mode improvements. In this innovation, video content typically associated with gaming, which is frequently coded in transform skip mode, is treated separately from other portions of a video coding block. This methodology enhances video coding efficiency by minimizing the transitions between coding modes. The process involves separate encoding for regular coded portions and transform skip coded portions, followed by an inverse operation at the decoder for optimal video block reconstruction.

Career Highlights

Ya Chen has made substantial contributions while working at notable firms, such as InterDigital VC Holdings, Inc. and InterDigital CE Patent Holdings, SAS. His innovations have not only advanced technology in his field but also positioned him as a key figure among inventors focusing on the intersection of image processing and data compression.

Collaborations

Throughout his career, Ya Chen has collaborated with esteemed colleagues, including Tangi Poirier and Philippe Bordes. These partnerships have undoubtedly enriched his research endeavors and contributed to the success of his groundbreaking patents.

Conclusion

Ya Chen's innovative spirit and commitment to improving video coding and optical flow techniques through his patents underscore his influence in the technological landscape. With 29 patents to his name, his contributions continue to shape advancements in video processing and motion compensation methodologies, reflecting a bright future for further innovations in these critical areas.