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    • 1. 发明授权
    • Perceptual-based spatio-temporal segmentation for motion estimation
    • 用于运动估计的基于感知的时空分割
    • US06360017B1
    • 2002-03-19
    • US09239135
    • 1999-01-28
    • Yi-Jen ChiuJohn HartungArnaud Eric JacquinRobert James Safranek
    • Yi-Jen ChiuJohn HartungArnaud Eric JacquinRobert James Safranek
    • G06K936
    • H04N19/137H04N19/107H04N19/176H04N19/51H04N19/61
    • A method of encoding a video sequence including a sequence of video images includes first comparing elements of a portion of a first video image (e.g., pixels of a macroblock of a current frame) with elements of a portion of a second video image (e.g., corresponding pixels of a macroblock of a previous frame) to generate respective intensity difference values for the element comparisons. Then, a first value (e.g., one) is assigned to the intensity difference values that are above a visually perceptible threshold value and a second value (e.g., zero) is assigned to the intensity difference values that are at or below the visually perceptible threshold value. Next, the method includes summing the first and second values to generate a sum. If the sum is greater than a predetermined decision value, the portion of the first video image is encoded (e.g., motion compensated). The method is fully compatible and, thus, may be implemented with video standards such as, for example, H.261, H.263, Motion-JPEG, MPEG-1, and MPEG-2.
    • 对包括视频图像序列的视频序列进行编码的方法包括将第一视频图像的一部分(例如,当前帧的宏块的像素)与第二视频图像的一部分的元素(例如, 前一帧的宏块的相应像素)以产生用于元素比较的各个强度差值。 然后,将第一值(例如,一个)分配给高于视觉上可察觉的阈值的强度差值,并且将第二值(例如,零)分配给视觉上可见阈值或以下的强度差值 值。 接下来,该方法包括对第一和第二值求和以产生和。 如果和大于预定的判定值,则对第一视频图像的部分进行编码(例如,运动补偿)。 该方法是完全兼容的,并且因此可以利用诸如H.261,H.263,Motion-JPEG,MPEG-1和MPEG-2之类的视频标准来实现。
    • 2. 发明授权
    • Global rate control for model-assisted coding of low bit rate video
    • 低比特率视频模型辅助编码的全局速率控制
    • US5745178A
    • 1998-04-28
    • US589660
    • 1996-01-22
    • John HartungArnaud Eric JacquinJonathan David Rosenberg
    • John HartungArnaud Eric JacquinJonathan David Rosenberg
    • G06T9/00H03M7/38H04N7/26H04N7/46H04N7/50H04N7/12H04N11/02H04N11/04
    • H04N19/587H04N19/126H04N19/132H04N19/149H04N19/15H04N19/164H04N19/17H04N19/172H04N19/192H04N19/196H04N19/61H04N19/146H04N19/152H04N19/20
    • A method and apparatus for coding an image comprising (at least) two regions (e.g., a facial region and a background region) which are to be coded with different quantization error parameters (e.g., quantizer step sizes), wherein the respective quantization error parameters are determined with use of a feed-forward rate control technique. Initial quantization error parameters are assigned to each region, and the overall bit rate which would result for the coding of the given frame is computed based on these assigned quantization error parameters. The computed bit rate is compared to a given bit rate constraint which may, for example, represent a limitation of a transmission channel. Based on the result of this comparison, one or both of the assigned quantization error parameters are adjusted, thereby resulting in different quantization error parameters for the two regions. For example, if the computed bit rate exceeds the given bit rate constraint, at least one of the quantization error parameters is advantageously adjusted in a direction which results in the use of fewer coding bits (e.g., a coarser quantization). If the given bit rate constraint exceeds the computed bit rate, at least one of the quantization error parameters is advantageously adjusted in a direction which results in the use of more coding bits (e.g., a finer quantization resulting in a higher coding quality). Finally, each of the regions is coded based on the correspondingly assigned quantization error parameters.
    • 一种用于对包括(至少)两个区域(例如,面部区域和背景区域)进行编码的图像的方法和装置,其将被用不同的量化误差参数(例如,量化器步长)进行编码,其中相应的量化误差参数 使用前馈速率控制技术来确定。 初始量化误差参数被分配给每个区域,并且基于这些分配的量化误差参数来计算对于给定帧的编码将导致的总比特率。 将计算的比特率与给定的比特率约束进行比较,给定比特率约束例如可以表示传输信道的限制。 基于该比较的结果,调整分配的量化误差参数中的一个或两个,从而导致两个区域的量化误差参数不同。 例如,如果所计算的比特率超过给定比特率约束,则有利地在导致使用较少编码比特(例如较粗略量化)的方向上调整量化误差参数中的至少一个。 如果给定的比特率约束超过计算的比特率,则有利的是在导致使用更多的编码比特的方向上调整量化误差参数中的至少一个(例如,更精细的量化导致更高的编码质量)。 最后,基于相应分配的量化误差参数对每个区域进行编码。
    • 3. 发明授权
    • Motion vector estimation based on statistical features of an image frame
    • 基于图像帧的统计特征的运动矢量估计
    • US06463164B1
    • 2002-10-08
    • US09137400
    • 1998-08-20
    • Yi-Jen ChiuJohn Hartung
    • Yi-Jen ChiuJohn Hartung
    • G06K900
    • G06T7/277
    • A method for estimating motion vectors between a current frame and a reference frame of a video signal wherein the current frame is divided into a plurality of search blocks and the reference frame and is defined to include a plurality of search regions corresponding to the plurality of search blocks, each of the plural search regions having a plurality of candidate blocks. The method includes the steps of calculating horizontal and vertical features of a reference frame based on pixel data of the reference frame; storing the calculated horizontal and vertical features; computing horizontal and vertical features of a kth search block of the plurality of search blocks; comparing the horizontal and vertical features of the kth search block with those of each of the plurality of candidate blocks of the reference frame in a corresponding search region using a computationally-efficient error measure; selecting a candidate block which yields a minimal error measure; and computing a motion vector for the kth search block based on the selected candidate block.
    • 一种用于估计视频信号的当前帧和参考帧之间的运动矢量的方法,其中当前帧被划分为多个搜索块和参考帧,并且被定义为包括与多个搜索对应的多个搜索区域 多个搜索区域中的每一个具有多个候选块。 该方法包括基于参考帧的像素数据计算参考帧的水平和垂直特征的步骤; 存储计算的水平和垂直特征; 计算所述多个搜索块的第k个搜索块的水平和垂直特征; 使用计算有效的误差测量将第k个搜索块的水平和垂直特征与参考帧的多个候选块中的每一个的相应搜索区域的水平和垂直特征进行比较; 选择产生最小误差测量的候选块; 以及基于所选择的候选块来计算第k个搜索块的运动矢量。