公开(公告)号：US09203708B2

公开(公告)日：2015-12-01

申请号：US13388818

申请日：2012-01-16

申请人： David Lindegren ,  Richard Tano

发明人： David Lindegren ,  Richard Tano

IPC分类号： H04N21/647 ,  H04L29/06 ,  H04L12/24 ,  H04N17/00

CPC分类号： H04L41/5067 ,  H04L65/80 ,  H04N17/004 ,  H04N21/647

摘要： One or more embodiments herein dynamically and objectively estimate user-perceived quality of an encoded video stream in dependence on the underlying video content of that stream. Estimation processing according to these embodiments includes generating a chronological sequence of the absolute or relative sizes of encoded video frames in the stream. Processing further entails analyzing this sequence to identify a plurality of reference characteristics that are defined in a reference model. These reference characteristics are more specifically defined in the reference model as parameters that characterize or are otherwise associated with content-dependent variations in user-perceived quality. For example, the reference characteristics in some embodiments comprise reference patterns or reference statistical measures that have been determined based on analyzing frame size sequences generated for reference video streams with known qualities. Regardless, processing finally includes estimating the user-perceived quality of the stream based on the identified reference characteristics, according to the reference model.

摘要翻译： 本文中的一个或多个实施例根据该流的底层视频内容动态和客观地估计编码视频流的用户感知质量。 根据这些实施例的估计处理包括生成流中编码视频帧的绝对或相对大小的时间顺序。 处理进一步需要分析该序列以识别在参考模型中定义的多个参考特征。 这些参考特征在参考模型中被更具体地定义为表征或以其他方式与用户感知质量的内容相关变化相关联的参数。 例如，一些实施例中的参考特征包括已经基于分析为已知质量的参考视频流生成的帧大小序列而确定的参考模式或参考统计量度。 无论如何，处理最终包括根据参考模型基于所识别的参考特征来估计流的用户感知质量。

公开(公告)号：US20140376886A1

公开(公告)日：2014-12-25

申请号：US14351483

申请日：2011-10-11

申请人： Martin Pettersson ,  Savvas Argyropoulos ,  David Lindegren ,  Peter List

发明人： Martin Pettersson ,  Savvas Argyropoulos ,  David Lindegren ,  Peter List

IPC分类号： H04N17/00 ,  H04N5/93

CPC分类号： H04N17/004 ,  H04N5/147 ,  H04N5/93

摘要： There are provided a plurality of methods for detecting a scene change in a streamed video, the streamed video comprising a series of pictures. An example method comprises calculating, for a plurality of positions, a difference between the costs of coding macro-blocks at the same position in successive pictures. The method further comprises identifying a new scene when the sum of the differences for a plurality of positions meets a threshold criterion. There is further provided a method of determining the perceptual impact of a packet loss on a streamed video the method comprising: identifying a packet loss; and determining if the lost packet contained information relating to a picture at the start of a new scene, wherein a new scene is detected using one of the methods disclosed herein.

摘要翻译： 提供了用于检测流式视频中的场景变化的多种方法，该流式视频包括一系列图片。 对于多个位置，示例性方法包括在连续图像中的相同位置处编码宏块的成本之间的差异。 该方法还包括当多个位置的差值之和满足阈值标准时识别新场景。 还提供了一种确定分组丢失对流式视频的感知影响的方法，该方法包括：识别分组丢失; 以及确定丢失分组是否包含与新场景开始时的图片相关的信息，其中使用本文公开的方法之一来检测新场景。

公开(公告)号：US20130276143A1

公开(公告)日：2013-10-17

申请号：US13976295

申请日：2010-12-30

申请人： Peter Ökvist ,  Tomas Jönsson ,  David Lindegren

发明人： Peter Ökvist ,  Tomas Jönsson ,  David Lindegren

IPC分类号： G06F21/62

CPC分类号： G06F21/6218 ,  A61B5/00 ,  G06F3/011 ,  G06F3/0482 ,  G06F19/00 ,  G16H40/63 ,  G16H50/30 ,  H04M1/72519 ,  H04M1/72536 ,  H04M1/72569 ,  H04M1/72588 ,  H04M2250/10 ,  H04M2250/12

摘要： A user equipment for providing information most relevant to a user as the user becomes impaired or experiences diminishing capacity is disclosed. The user equipment includes a transceiver, a memory, at least one sensor for detecting a biometric measurement of a user of the equipment, a user interface and a processor. The processor filters the biometric measurement, calculates a metric based on the measurement, evaluates the metric, selectively adjusts an amount of information displayed on the user interface based on the evaluated metric and executes an application corresponding to a user actuation of an item of the displayed information.

摘要翻译： 公开了一种用户设备，用于在用户受损或经历衰减的能力时提供与用户最相关的信息。 用户设备包括收发器，存储器，用于检测设备的用户的生物测量的至少一个传感器，用户界面和处理器。 处理器过滤生物测量，基于测量计算度量，评估度量，基于所评估的度量来选择性地调整在用户界面上显示的信息量，并且执行对应于所显示的项目的用户激活的应用 信息。

公开(公告)号：US20110211629A1

公开(公告)日：2011-09-01

申请号：US13127285

申请日：2008-11-04

申请人： Jörgen Gustafsson ,  David Lindegren ,  Martin Pettersson

发明人： Jörgen Gustafsson ,  David Lindegren ,  Martin Pettersson

IPC分类号： H04B17/00

CPC分类号： H04N19/66 ,  H04L43/0835 ,  H04N17/004 ,  H04N19/154 ,  H04N19/159 ,  H04N19/46 ,  H04N19/521 ,  H04N19/89

摘要： Hence a method is provided for determining a quality value of a video stream, comprising the steps of: identifying lost data packets of the video stream; identifying at least two intra coded frames of the video stream; determining intra coded frames having a maintained image quality, based on estimating if a lost data packet is associated with an intra coded frame; estimating a distance between each one of the lost data packets and a next respective, subsequent intra coded frame having a maintained image quality; and generating the quality value, based on the distances. A system and a computer readable medium are also described.

摘要翻译： 因此，提供了一种用于确定视频流的质量值的方法，包括以下步骤：识别视频流的丢失数据分组; 识别视频流的至少两个帧内编码帧; 基于估计丢失的数据分组是否与帧内编码帧相关联，确定具有维持的图像质量的帧内编码帧; 估计每个丢失数据分组之间的距离和具有维持图像质量的下一个相应的后续帧内编码帧; 并根据距离生成质量值。 还描述了系统和计算机可读介质。