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    • 7. 发明申请
    • VIDEO CODING
    • 视频编码
    • WO2009060178A1
    • 2009-05-14
    • PCT/GB2008/003691
    • 2008-10-29
    • BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANYNILSSON, Michael, Erling
    • NILSSON, Michael, Erling
    • H04N7/26H04N7/50
    • H04N7/50H04N19/124H04N19/15H04N19/154H04N19/177H04N19/194H04N19/61
    • A sequence to be encoded is divided into a plurality of temporal portions or chunks. The sequence is then analysed to determine for each chunk, in accordance with a plurality of encoding quality settings, data establishing the relationship between the quality settings and (i) a quality metric for the portion and (ii) the number of bits generated by encoding the portion at that quality setting. Given a target quality, a target bit rate is then set (or vice versa); then one chooses a set of quality settings, one per chunk, that tends to minimise a combined quality cost for the sequence within the constraint that transmission of encoded video at the target bit rate via transmitting and receiving buffers of specified size and initial receiver buffer fullness shall not cause underflow nor overflow. The combined quality cost is the sum of individual quality costs each of which is a function of the deviation of the quality metric of the respective encoded portion from the target quality, the function being such that the cost generally increases as the absolute value of the deviation increases. The sequence is then encoded using the chosen quality settings.
    • 要编码的序列被分成多个时间部分或块。 然后分析该序列以确定每个块,根据多个编码质量设置,确定质量设置之间的关系的数据和(i)该部分的质量度量和(ii)通过编码产生的比特数 该质量设置的部分。 给定目标质量,然后设置目标比特率(反之亦然); 那么选择一组质量设置,每个块一个,这倾向于最小化在限制内的序列的组合质量成本的约束中,通过经指定大小的发送和接收缓冲器和初始接收器缓冲器充满度以目标比特率传输编码视频 不得引起下溢或溢流。 组合质量成本是个体质量成本的总和,每个质量成本是相应编码部分的质量度量与目标质量的偏差的函数,该函数使得成本通常随偏差的绝对值而增加 增加。 然后使用所选的质量设置对序列进行编码。
    • 9. 发明申请
    • GLOBAL MOTION ESTIMATION
    • 全球运动估计
    • WO2006097673A1
    • 2006-09-21
    • PCT/GB2006/000377
    • 2006-02-03
    • BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANYNILSSON, Michael, Erling
    • NILSSON, Michael, Erling
    • H04N7/26
    • H04N19/527
    • A global motion vector for a first video frame identifies a shift that, when applied to another frame of a television picture, increases the similarity between the two frames. In order to estimate this shift the method comprises selecting picture elements from the first frame; comparing the selected picture elements with correspondingly positioned picture elements of the other frame to produce a measure of similarity in respect of zero shift; comparing, for each of a plurality of trial shifts, the selected picture elements with picture elements of the other frame that have the same mutual positions but shifted by the respective shift, to produce a measure of similarity in respect of that shift; and identifying that shift (or zero) which gives rise to a measure indicative of high similarity. The picture elements are taken only from selected lines of the picture, the number of selected lines being less than 5% of the total number of lines in the frame - possibly even as few as three. The selected picture elements consist of a set of contiguous picture elements taken from the central portion of each selected line. The shifts considered may be primarily or even exclusively horizontal.
    • 用于第一视频帧的全局运动矢量标识当应用于电视图像的另一帧时增加两帧之间的相似性的偏移。 为了估计该偏移,该方法包括从第一帧中选择图像元素; 将所选择的图像元素与另一帧的相应定位的图像元素进行比较,以产生关于零移位的相似度度量; 将所选择的图像元素与具有相同相互位置但相移相移的另一帧的图像元素进行比较,以产生关于该移位的相似度度量; 并且识别导致表示高相似性的度量的偏移(或零)。 图像元素仅从图像的选定行中取出,所选择的行数小于帧中总行数的5%,甚至可能只有三个。 所选择的图像元素由从每个所选行的中心部分获取的一组连续图像元素组成。 所考虑的轮班可能主要或甚至完全是水平的。