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Harvard College

Peng Yin

Yunfei Zheng

Taoran Lu

Xiaoan Lu

Joel Sole

Qian Xu

Tao Chen

Purvin Bibhas Pandit

Walter J Husak

Fangjun Pu

Jill MacDonald Boyce

Guan-Ming Su

Sean Thomas McCarthy

Yeping Su

Cristina Gomila

Jiancong Luo

Dong Tian

Oscar Divorra Escoda

Robin Atkins

Alexandros Michael Tourapis

Jaclyn Anne Pytlarz

Lihua Zhu

Liwei Guo

Sheng Qu

Yang Hu

Yuwen He

Qian Chen

Yan Ye

Samir N Hulyalkar

Yu Wen Wu

Yong Ying Gao

Meng-Ping Kao

Joel Sole Rojals

Jae Hoon Kim

Walter Christian Gish

Jiheng Yang

Jay Nitin Shingala

Adeel Abbas

Polin Lai

Joan Llach

Jeffrey Allen Cooper

Jeffrey Adam Bloom

Dekun Zou

Yufei Yuan

Ashwin Natesan

PoLin Lai

Cristina Gomila Torres

Kiran Mukesh Misra

Glenn N Dickins

Ying Li

Xuejing Sun

Jiefu Zhai

Zhenyu Wu

Jun Xu

Qing Song

Chad Andrew Lefevre

Neeraj J Gadgil

Wang Lin Lai

Gopi Lakshminarayanan

David Brooks

Zhan Ma

Po-Lin Lai

Jan Froehlich

Weiyao Lin

Jian Lou

Hariharan Ganapathy

Dung Trung Vo

Qiuwei Wang

Arunkumar Mohananchettiar

Hariharan Ganapathy-Kathirvelu

Arun Raj

Ian Godin

Toaran Lu

Doug Tian

Shay Har-Noy

Jole Sole

Ralf Willenbacher

QiAn Xu

Jill Macdonald Boyce

Xi Chen

Sarit Agasti

Ralf Jungmann

David Yu Zhang

Sean Thomas Mccarthy

Jill Mac Boyce

Methods and systems for canvas size scalability across the same or different bitstream layers of a video coded bitstream are described. Offset parameters for a conformance window, a reference region of interest (ROI) in a reference layer, and a current ROI in a current layer are received. The width and height of a current ROI and a reference ROI are computed based on the offset parameters and they are used to generate a width and height scaling factor to be used by a reference picture resampling unit to generate an output picture based on the current ROI and the reference ROI.

Canvas size scalable video coding

Methods and apparatus are provided for intra coding a block having pixels assigned to groups. An apparatus includes a video encoder for encoding a block in a picture using intra prediction by dividing pixels within the block into at least a first group and a second group and encoding the pixels in the first group prior to encoding the pixels in the second group. A prediction for at least one of the pixels within the second group is obtained by evaluating the pixels within the first group and the second group.

Methods and apparatus for intra coding a block having pixels assigned to groups

Methods and apparatus are provided for collaborative partition coding for region based filters. An apparatus includes a video encoder () for encoding image data for a plurality of regions in a picture. The video encoder () includes multiple filters for filtering the image data based on region partition information for the plurality of regions. The region partition information for the plurality of regions is shared between the multiple filters.

Methods and apparatus for collaborative partition coding for region based filters

Methods are described to communicate source color volume information in a coded bitstream using SEI messaging. Such data include at least the minimum, maximum, and average luminance values in the source data plus optional data that may include the color volume x and y chromaticity coordinates for the input color primaries (e.g., red, green, and blue) of the source data, and the color x and y chromaticity coordinates for the color primaries corresponding to the minimum, average, and maximum luminance values in the source data. Messaging data signaling an active region in each picture may also be included.

Source color volume information messaging

There are provided methods and apparatus for adaptive geometric partitioning for video encoding and decoding. An apparatus includes an encoder for encoding image data corresponding to pictures by adaptively partitioning at least portions of the pictures responsive to at least one parametric model. The at least one parametric model involves at least one of implicit and explicit formulation of at least one curve.

Method and apparatus for parametric, model-based, geometric frame partitioning for video coding

Methods and systems for frame rate scalability are described. Support is provided for input and output video sequences with variable frame rate and variable shutter angle across scenes, or for input video sequences with fixed input frame rate and input shutter angle, but allowing a decoder to generate a video output at a different output frame rate and shutter angle than the corresponding input values. Techniques allowing a decoder to decode more computationally-efficiently a specific backward compatible target frame rate and shutter angle among those allowed are also presented.

Frame-rate scalable video coding

Methods, systems, and bitstream syntax are described for the entropy modeling of latent features in image and video coding using a combination of probability density functions. Using high-level syntax elements, an encoder may signal to compliant decoders the multi-distribution entropy model using: the number of one or more PDFs being used, an identifier of each PDF being used among a list of available PDFs, the number of PDF parameters in each PDF, and syntax elements indicating which PDF parameters across two or more PDFs being used are being shared.

Multi-distribution entropy modeling of latent features in image and video coding using neural networks

Methods, systems, and bitstream syntax are described for constrained processing in video coding. Using one or more syntax elements and either explicit or implicit signaling, an encoder may signal to compliant decoders that certain features of the main profile, such as subpictures and multi-layered scalable coding, are disabled.

Semantics for constrained processing and conformance testing in video coding

Given a sequence of images in a first codeword representation, methods, processes, and systems are presented for image reshaping using rate distortion optimization, wherein reshaping allows the images to be coded in a second codeword representation which allows more efficient compression than using the first codeword representation. Syntax methods for signaling reshaping parameters are also presented.

Image reshaping in video coding using rate distortion optimization

A quantization parameter signalling mechanism for both SDR and HDR content in video coding is described using two approaches. The first approach is to send the user-defined Qptable directly in high level syntax. This leads to more flexible and efficient QP control for future codec development and video content coding. The second approach is to signal luma and chroma QPs independently. This approach eliminates the need for Qptables and removes the dependency of chroma quantization parameter on luma QP.

Quantization parameter signaling

In a method to improve the coding efficiency of high-dynamic range (HDR) images, a decoder parses sequence processing set (SPS) data from an input coded bitstream to detect that an HDR extension syntax structure is present in the parsed SPS data. It extracts from the HDR extension syntax structure post-processing information that includes one or more of a color space enabled flag, a color enhancement enabled flag, an adaptive reshaping enabled flag, a dynamic range conversion flag, a color correction enabled flag, or an SDR viewable flag. It decodes the input bitstream to generate a preliminary output decoded signal, and generates a second output signal based on the preliminary output signal and the post-processing information.

Signal reshaping and coding for HDR and wide color gamut signals

Methods and apparatus are provided for encoding and decoding binary sets using adaptive tree selection. In one exemplary encoding method embodiment, picture data is encoded for a block in a picture; in which one of a plurality of trees structures is selected to code a binary set of data for indicating coefficient significance for the block. In another exemplary encoding method embodiment, picture data is encoded for a block in a picture, in which one or more trees are used to encode a binary set of data for indicating significance for the block, the one or more trees each having a plurality of nodes, at least one of the nodes of the one or more trees being modified responsive to at least one parameter.

Methods and apparatus for video encoding and decoding binary sets using adaptive tree selection

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Ithaca, NY, United States of America

Peng Yin