-
公开(公告)号：US20230005243A1
公开(公告)日：2023-01-05
申请号：US17780279
申请日：2020-12-02
IPC分类号： G06V10/762 , G06V10/764 , G06V10/26 , G06V10/28 , G06V10/34 , G06V10/56
摘要： A method for image segmentation includes (a) clustering, based upon k-means clustering, pixels of an image into first clusters, (b) outputting a cluster map of the first clusters (c) re-clustering the pixels into a new plurality of non-disjoint pixel-clusters, and (d) classifying the non-disjoint pixel-clusters in categories, according to a user-indicated classification. Another method for image segmentation includes (a) forming a graph with each node of the graph corresponding to a first respective non-disjoint pixel-cluster of the image and connected to each terminal of the graph and to all other nodes corresponding to other respective non-disjoint pixel-clusters that, in the image, are within a neighborhood of the first respective non-disjoint pixel-cluster, (b) setting weights of connections of the graph according to a user-indicated classification in categories respectively associated with the terminals, and (c) segmenting the image into the categories by cutting the graph based upon the weights.
-
公开(公告)号：US11388408B2
公开(公告)日：2022-07-12
申请号：US17299743
申请日：2019-11-27
发明人： Harshad Kadu , Qing Song , Guan-Ming Su
IPC分类号： H04N19/132 , H04N19/182 , H04N19/169 , H04N19/98
摘要： Methods and systems for generating an interpolated reshaping function for the efficient coding of high-dynamic range images are provided. The interpolated reshaping function is constructed based on a set of pre-computed basis reshaping functions. Interpolation schemes are derived for pre-computed basis reshaping functions represented as look-up tables, multi-segment polynomials, or matrices of coefficients in a multivariate, multi-regression representation. Encoders and decoders using asymmetric reshaping and interpolated reshaping functions for mobile applications are also presented.
-
公开(公告)号：US11323728B2
公开(公告)日：2022-05-03
申请号：US17212701
申请日：2021-03-25
发明人： Robin Atkins , Peng Yin , Taoran Lu , Fangjun Pu , Sean Thomas McCarthy , Walter J. Husak , Tao Chen , Guan-Ming Su
IPC分类号： H04N19/31 , H04N19/187
摘要： 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.
-
公开(公告)号：US11277646B2
公开(公告)日：2022-03-15
申请号：US17282523
申请日：2019-10-02
发明人： Qing Song , Neeraj J. Gadgil , Guan-Ming Su , Peng Yin , Arun Raj
IPC分类号： H04N19/86 , H04N19/182 , H04N19/189 , H04N19/117
摘要： Methods and systems for reducing banding artifacts when displaying high-dynamic-range images reconstructed from coded reshaped images are described. Given an input image in a high dynamic range (HDR) which is mapped to a second image in a second dynamic range, banding artifacts in a reconstructed HDR image generated using the second image are reduced by a) in darks and mid-tone regions of the input image, adding noise to the input image before being mapped to the second image, and b) in highlights regions of the input image, modifying an input backward reshaping function, wherein the modified backward reshaping function will be used by a decoder to map a decoded version of the second image to the reconstructed HDR image. An example noise generation technique using simulated film-grain noise is provided.
-
公开(公告)号：US11146803B2
公开(公告)日：2021-10-12
申请号：US14772051
申请日：2014-02-14
发明人： Guan-Ming Su , Samir N. Hulyalkar , Tao Chen
IPC分类号： H04N19/33 , H04N19/124 , H04N19/157 , H04N19/44 , H04N19/593 , H04N19/70 , G06T3/40
摘要： An encoder receives an input enhanced dynamic range (EDR) image to be stored or transmitted using multiple coding formats in a layered representation. A layer decomposer generates a lower dynamic range (LDR) image from the EDR image. One or more base layer (BL) encoders encode the LDR image to generate a main coded BL stream and one or more secondary coded BL streams, where each secondary BL stream is coded in a different coding format than the main coded BL stream. A single enhancement layer (EL) coded stream and related metadata are generated using the main coded BL stream, the LDR image, and the input EDR image. An output coded stream includes the coded EL stream, the metadata, and either the main coded BL stream or one of the secondary coded BL streams. Computation-scalable decoding and display management processes for EDR images are also described.
-
公开(公告)号：US10701375B2
公开(公告)日：2020-06-30
申请号：US16087241
申请日：2017-03-22
发明人： Guan-Ming Su , Jon Scott Miller , Walter J. Husak , Yee Jin Lee , Harshad Kadu
IPC分类号： H04N19/186 , H04N19/176 , G06T5/00 , H04N19/80 , H04N19/154 , H04N19/117 , H04N19/102 , H04N19/187 , H04N19/44 , H04N1/60 , H04N19/85 , H04N1/64
摘要： A tone-mapping function that maps input images of a high dynamic range into reference tone-mapped images of a relatively narrow dynamic range is generated. A luma forward reshaping function is derived, based on first bit depths and second bit depths, for forward reshaping luma codewords of the input images into forward reshaped luma codewords of forward reshaped images approximating the reference tone-mapped images. A chroma forward reshaping mapping is derived for predicting chroma codewords of the forward reshaped images. Backward reshaping metadata that is to be used by recipient devices to generate a luma backward reshaping function and a chroma backward reshaping mapping is transmitted with the forward reshaped images to the recipient devices. Techniques for the joint derivation of forward luma and chroma reshaping functions are also presented.
-
公开(公告)号：US10440401B2
公开(公告)日：2019-10-08
申请号：US15481015
申请日：2017-04-06
发明人： Guan-Ming Su , Qian Chen , Tao Chen , David Brooks , Samir N. Hulyalkar , Peng Yin
IPC分类号： H04N7/18 , H04N11/02 , H04N11/04 , H04N19/98 , H04N19/50 , H04N19/31 , H04N19/70 , H04N19/33
摘要： A processor for video coding receives a full-frame rate (FFR) HDR video signal and a corresponding FFR SDR video signal. An encoder generates a scalable bitstream that allows decoders to generate half-frame-rate (HFR) SDR, FFR SDR, HFR HDR, or FFR HDR signals. Given odd and even frames of the input FFR SDR signal, the scalable bitstream combines a base layer of coded even SDR frames with an enhancement layer of coded packed frames, where each packed frame includes a downscaled odd SDR frame, a downscaled even HDR residual frame, and a downscaled odd HDR residual frame. In an alternative implementation, the scalable bitstream combines four signals layers: a base layer of even SDR frames, an enhancement layer of odd SDR frames, a base layer of even HDR residual frames and an enhancement layer of odd HDR residual frames. Corresponding decoder architectures are also presented.
-
公开(公告)号：US10021390B2
公开(公告)日：2018-07-10
申请号：US15608433
申请日：2017-05-30
发明人： Guan-Ming Su , Sheng Qu , Hubert Koepfer , Yufei Yuan , Samir Hulyalkar
IPC分类号： H04N19/15 , G06F17/18 , H04N19/192 , H04N19/98 , H04N19/105
CPC分类号： H04N19/105 , G06F17/18 , H04N19/147 , H04N19/16 , H04N19/192 , H04N19/30 , H04N19/98 , H05K999/99
摘要： Inter-color image prediction is based on multi-channel multiple regression (MMR) models. Image prediction is applied to the efficient coding of images and video signals of high dynamic range. MMR models may include first order parameters, second order parameters, and cross-pixel parameters. MMR models using extension parameters incorporating neighbor pixel relations are also presented. Using minimum means-square error criteria, closed form solutions for the prediction parameters are presented for a variety of MMR models.
-
公开(公告)号：US09924171B2
公开(公告)日：2018-03-20
申请号：US15280822
申请日：2016-09-29
发明人： Guan-Ming Su , Sheng Qu , Samir N. Hulyalkar , Tao Chen , Walter C. Gish , Hubert Koepfer
IPC分类号： H04N19/103 , H04N19/124 , H04N19/98 , H04N19/30 , H04N19/126
CPC分类号： H04N19/124 , H04N19/103 , H04N19/126 , H04N19/142 , H04N19/187 , H04N19/30 , H04N19/98
摘要： Techniques use multiple lower bit depth (e.g., 8 bits) codecs to provide higher bit depth (e.g., 12+ bits) high dynamic range images from an upstream device to a downstream device. Multiple layers comprising a base layer and one or more enhancement layers may be used to carry video signals comprising image data compressed by lower bit depth encoders to a downstream device, wherein the base layer cannot be decoded and viewed on its own. Lower bit depth input image data to base layer processing may be generated from higher bit depth high dynamic range input image data via advanced quantization to minimize the volume of image data to be carried by enhancement layer video signals. The image data in the enhancement layer video signals may comprise residual values, quantization parameters, and mapping parameters based in part on a prediction method corresponding to a specific method used in the advanced quantization. Adaptive dynamic range adaptation techniques take into consideration special transition effects, such as fade-in and fade-outs, for improved coding performance.
-
公开(公告)号：US09866734B2
公开(公告)日：2018-01-09
申请号：US14801633
申请日：2015-07-16
摘要： A scene change is determined using a first and a second video signal, each representing the same scene or content, but at a different color grade (such as dynamic range). A set of prediction coefficients is generated to generate prediction signals approximating the first signal based on the second signal and a prediction model. A set of prediction error signals is generated based on the prediction signals and the first signal. Then, a scene change is detected based on the characteristics of the prediction error signals. Alternatively, a set of entropy values of the difference signals between the first and second video signals are computed, and a scene change is detected based on the characteristics of the entropy values.
-
-
-
-
-
-
-
-
-
搜索结果
115 条记录 (耗时 0.027 秒)