公开(公告)号：US20190068992A1

公开(公告)日：2019-02-28

申请号：US16173105

申请日：2018-10-29

Applicant: Apple Inc.

Inventor： Alexandros TOURAPIS ,  David W. SINGER ,  Haitao GUO ,  Hsi-Jung WU ,  Sorin C. CISMAS ,  Xiaohua YANG ,  Yeping SU ,  Dazhong ZHANG

IPC: H04N19/593 ,  H04N19/174 ,  H04N19/156 ,  H04N19/176 ,  H04N19/182 ,  H04N19/117

Abstract: Methods are described for encoding and decoding blocks of image data using intra block copying (IBC). A source block for intra block copying is selected from a source region of a current image that is closer to the current block than a threshold, wherein the source region does not include a portion of the current image that is further from the current block than the threshold.

公开(公告)号：US20140241415A1

公开(公告)日：2014-08-28

申请号：US14190880

申请日：2014-02-26

Applicant: Apple Inc.

Inventor： Yeping SU ,  Hao PAN ,  James O. NORMILE ,  Hsi-Jung WU

IPC: H04N19/152 ,  H04N19/142

CPC classification number: H04N19/152 ,  H04N19/142 ,  H04N21/23418 ,  H04N21/23424 ,  H04N21/23439 ,  H04N21/2402 ,  H04N21/44004 ,  H04N21/44008 ,  H04N21/8456

Abstract: Systems and methods are presented for minimizing the suddenness and immediacy of changes to the video quality perceived by users due to bandwidth fluctuations and transitions between different bitrate streams. A method may include identifying an upcoming bitrate change in a bitstream and a nearest scene cut boundary from sync frame scene cut tags included in the bitstream. The method may include calculating whether waiting until the identified nearest scene cut boundary before changing the bitrate will cause the buffer to drop below a threshold. When the buffer is calculated to not drop below the threshold, the method may postpone the upcoming bitrate change until the identified nearest scene cut boundary.

Abstract translation: 提出了系统和方法，用于最小化由于带宽波动和不同比特率流之间的转换而使用户感知到的视频质量的突变和即时性。 一种方法可以包括从比特流中包括的同步帧场景切换标签中识别比特流中的即将到来的比特率变化和最近的场景剪切边界。 该方法可以包括计算是否在更改比特率之前等待直到所识别的最近的场景切割边界将导致缓冲器降低到阈值以下。 当缓冲区被计算为不低于阈值时，该方法可以推迟即将到来的比特率改变直到所识别的最近的场景切割边界。

公开(公告)号：US20140029846A1

公开(公告)日：2014-01-30

申请号：US13664359

申请日：2012-10-30

Applicant: APPLE INC.

Inventor： Yeping SU ,  Jiefu ZHAI ,  James Oliver NORMILE ,  Hsi-Jung WU ,  Hao PAN

IPC: G09G5/02

CPC classification number: G09G3/2048 ,  G09G3/2066 ,  G09G2340/06 ,  G09G2350/00

Abstract: YCbCr image data may be dithered and converted into RGB data shown on a 8-bit or other bit display. Dither methods and image processors are provided which generate the banding artifact free image data during this process. Some methods and image processors may applying a stronger dither having a same mean with a larger variance to the image data before it is converted to RGB data. Others methods and image processors may calculate a quantization or encoding error and diffuse the calculated error among one or more neighboring pixel blocks.

Abstract translation: YCbCr图像数据可以抖动并转换成8位或其他位显示器上显示的RGB数据。 提供抖动方法和图像处理器，其在该处理期间产生无带纹带图像数据。 一些方法和图像处理器可以在将图像数据转换成RGB数据之前，对图像数据应用具有相同平均值的较强抖动。 其他方法和图像处理器可以计算量化或编码误差并且在一个或多个相邻像素块之间扩展所计算的误差。