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    • 1. 发明申请
    • VIDEO QUALITY ESTIMATION APPARATUS, VIDEO QUALITY ESTIMATION METHOD, AND PROGRAM
    • 视频质量估计装置,视频质量估计方法和程序
    • US20120201310A1
    • 2012-08-09
    • US13501210
    • 2010-03-25
    • Kazuhisa YamagishiTakanori HayashiJun Okamoto
    • Kazuhisa YamagishiTakanori HayashiJun Okamoto
    • H04N7/26
    • H04N17/004G06T7/0002G06T2207/10016G06T2207/30168
    • This invention provides a video quality estimation apparatus (1) including a packet analysis unit (10) that derives the bit rate of an encoded video packet contained in an input packet, and the bit amount of the encoded video packet for each encoded video frame type, a video subset frame characteristic estimation unit (11) that derives the frame characteristic of each video frame type from the bit rate derived by the packet analysis unit (10), and an encoding quality estimation unit (12) that derives, based on the bit rate and the bit amount of each video frame type, a video quality value quantitatively representing the quality of encoded video data that is affected by encoding degradation. The video quality estimation apparatus performs more accurate video quality estimation by taking account of the bit amount of each video frame type.
    • 本发明提供了一种视频质量估计装置(1),包括:分组分析单元(10),其导出包含在输入分组中的编码视频分组的比特率,以及每个编码视频帧类型的编码视频分组的比特量 ,根据由分组分析单元(10)导出的比特率导出每个视频帧类型的帧特性的视频子集帧特性估计单元(11),以及编码质量估计单元(12),其基于 比特率和每个视频帧类型的比特量,定量表示受编码降级影响的编码视频数据的质量的视频质量值。 视频质量估计装置通过考虑每个视频帧类型的比特量来执行更准确的视频质量估计。
    • 2. 发明授权
    • Disc drive apparatus
    • 盘驱动装置
    • US06775225B2
    • 2004-08-10
    • US10103021
    • 2002-03-21
    • Isamu NakadeTakanori Hayashi
    • Isamu NakadeTakanori Hayashi
    • G11B17028
    • G11B17/0282
    • Herein disclosed is a disc drive apparatus for driving an optical disc having a central portion formed with a central hole, comprising: a frame member, a disc retaining member rotatably supported by the frame member, a cam member supported by the disc retaining member and rockable with respect to the disc retaining member, a plurality of disc holding members each supported by the disc retaining member and operatively coupled with the cam member, each of the disc holding members being movable with respect to the disc retaining member to assume two different operation positions including a disc holding position in which each of the disc holding members is held in contact with the central portion of the optical disc, and a disc releasing position in which each of the disc holding members is held out of contact with the central portion of the optical disc, and a resilient member intervening between the disc retaining member and each of the disc holding members to have each of the disc holding members resiliently urged to assume the disc holding position.
    • 这里公开了一种用于驱动具有形成有中心孔的中心部分的光盘的盘驱动装置,包括:框架构件,由所述框架构件可旋转地支撑的盘保持构件,由所述盘保持构件支撑的凸轮构件和可摇动的 多个盘保持部件由盘保持部件支承,与凸轮部件可操作地连接,各盘片保持部件能够相对于盘片保持部件移动而呈现两个不同的动作位置 包括其中每个盘保持构件与光盘的中心部分保持接触的盘保持位置,以及盘释放位置,其中每个盘保持构件被保持为不与该光盘的中心部分接触 光盘,以及介于盘保持构件和每个盘保持构件之间的弹性构件,以使每个盘保持 弹性地推动盘片保持位置。
    • 7. 发明授权
    • Video quality estimation apparatus, video quality estimation method, and program
    • 视频质量估计装置,视频质量估计方法和程序
    • US09001897B2
    • 2015-04-07
    • US13501210
    • 2010-03-25
    • Kazuhisa YamagishiTakanori HayashiJun Okamoto
    • Kazuhisa YamagishiTakanori HayashiJun Okamoto
    • H04N7/26H04N17/00G06T7/00
    • H04N17/004G06T7/0002G06T2207/10016G06T2207/30168
    • This invention provides a video quality estimation apparatus (1) including a packet analysis unit (10) that derives the bit rate of an encoded video packet contained in an input packet, and the bit amount of the encoded video packet for each encoded video frame type, a video subset frame characteristic estimation unit (11) that derives the frame characteristic of each video frame type from the bit rate derived by the packet analysis unit (10), and an encoding quality estimation unit (12) that derives, based on the bit rate and the bit amount of each video frame type, a video quality value quantitatively representing the quality of encoded video data that is affected by encoding degradation. The video quality estimation apparatus performs more accurate video quality estimation by taking account of the bit amount of each video frame type.
    • 本发明提供了一种视频质量估计装置(1),包括:分组分析单元(10),其导出包含在输入分组中的编码视频分组的比特率,以及针对每个编码视频帧类型的编码视频分组的比特量 ,根据由分组分析单元(10)导出的比特率导出每个视频帧类型的帧特性的视频子集帧特性估计单元(11),以及编码质量估计单元(12),其基于 比特率和每个视频帧类型的比特量,定量表示受编码降级影响的编码视频数据的质量的视频质量值。 视频质量估计装置通过考虑每个视频帧类型的比特量来执行更准确的视频质量估计。
    • 8. 发明授权
    • Video quality estimation apparatus, method, and program
    • 视频质量估计装置,方法和程序
    • US08355342B2
    • 2013-01-15
    • US12811369
    • 2008-12-15
    • Kazuhisa YamagishiTakanori Hayashi
    • Kazuhisa YamagishiTakanori Hayashi
    • H04L12/26
    • H04N17/004H04L43/0829H04L43/0894
    • A packet loss frequency calculation unit (102) which counts, from an extracted packet loss pattern, packet losses generated in a predetermined interval representing the interval of a plurality of continuous IP packets as a packet loss of one time, thereby calculating the value as a packet loss frequency. The packet loss frequency calculation unit (102) also calculates a burst packet loss length representing the number of continuously lost packets from the packet loss pattern. An average burst packet loss length within a quality estimation interval is calculated from the burst packet loss length. A packet loss variation index calculation unit (106) derives a packet loss variation index from the average burst packet loss length. On the other hand, an encoding quality calculation unit (103) calculates an encoded video quality value based on the extracted encoding bit rate and frame rate. A video quality estimation unit (104) calculates a video quality value based on the encoded video quality value, packet loss frequency, and packet loss variation index. This allows to properly estimate the quality of a video in which a burst packet loss has occurred.
    • 一种分组丢失频率计算单元,其从提取的分组丢失模式中计数表示多个连续IP分组的间隔的预定间隔中产生的分组丢失作为一次丢包,从而将该值计算为 丢包频率。 分组丢失频率计算单元(102)还根据分组丢失模式计算表示连续丢失分组的数量的突发分组丢失长度。 从突发分组丢失长度计算质量估计间隔内的平均突发分组丢失长度。 分组丢失变化指标计算单元(106)根据平均突发分组丢失长度导出分组丢失变化指数。 另一方面,编码质量计算单元(103)基于所提取的编码比特率和帧率来计算编码视频质量值。 视频质量估计单元(104)基于编码视频质量值,分组丢失频率和分组丢失变化指数来计算视频质量值。 这允许适当地估计发生突发分组丢失的视频的质量。
    • 9. 发明授权
    • Video quality estimation apparatus, method, and program
    • 视频质量估计装置,方法和程序
    • US07965203B2
    • 2011-06-21
    • US11886408
    • 2006-11-28
    • Kazuhisa YamagishiTakanori Hayashi
    • Kazuhisa YamagishiTakanori Hayashi
    • G08G1/123
    • H04N17/004
    • In estimating subjective video quality corresponding to main parameters (121/221) which are input as an input coding bit rate (121B/221B) representing the number of coding bit rates per unit time and an input frame rate (121A/221A) representing the number of frames per unit time of an audiovisual medium, an estimation model specifying unit specifies, on the basis of the input coding bit rate (121B/input frame rate (221A)), an estimation model (122/222) representing the relationship between subjective video quality and the frame rate (/coding bit rate) of the audiovisual medium. Subjective video quality corresponding to the input frame rate (121A/input coding bit rate 221B) is estimated by using the specified estimation model (122/222) and output as an estimation value (123/223).
    • 在对作为表示每单位时间的编码比特率的输入编码比特率(121B / 221B)而输入的主要参数(121/221)的输入对象的主观视频质量和表示每单位时间的编码比特率的数字(121A / 221A) 视听媒体的每单位时间的帧数,估计模型确定单元基于输入的编码比特率(121B /输入帧速率(221A))来指定表示该视听媒体之间的关系的估计模型(122/222) 主观视频质量和视听媒体的帧速率(/编码比特率)。 通过使用指定的估计模型(122/222)来估计与输入帧速率(121A /输入编码比特率221B)相对应的主观视频质量,并输出作为估计值(123/223)。