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    • 14. 发明授权
    • Motion estimating method
    • 运动估计方法
    • US5825930A
    • 1998-10-20
    • US811189
    • 1997-03-05
    • Dong-seek ParkJohn VillasenorFeng Chen
    • Dong-seek ParkJohn VillasenorFeng Chen
    • H04N7/30H04N5/14H04N7/26H04N7/32H04N7/50G06K9/36
    • H04N5/145H04N19/103H04N19/126H04N19/139H04N19/147H04N19/176H04N19/192H04N19/51H04N19/61H04N19/146
    • A motion estimating method for determining a motion vector, using a bit rate-distortion technique in image compression. The motion estimating method includes the steps of obtaining a motion vector (x.sub.o, y.sub.o) which minimizes a predetermined error function, assuming a preferred motion vector (x, y), calculating the difference (x-diff, y-diff) between (x.sub.o, y.sub.o) and (x, y), obtaining the number of bits needed to encode the x-diff and y-diff, determining a bias based on a bias model according to the bit number, obtaining a final cost function value based on the difference between a cost function value and a bias, comparing the final cost function value with a predetermined allowance limit, determining the assumed motion vector (x, y) as a motion vector for a current macroblock and updating the allowance limit by using the cost function value, if the cost function value is smaller than the predetermined allowance limit and discarding the assumed motion vector (x, y) if the cost function value is not smaller than the predetermined allowance limit. The disclosed method is successful in increasing the compression rate.
    • 一种用于使用图像压缩中的比特率失真技术来确定运动矢量的运动估计方法。 运动估计方法包括以下步骤:假设优选的运动矢量(x,y),计算(xo,y-diff)之间的差(x-diff,y-diff),获得最小化预定误差函数的运动矢量 ,哟)和(x,y),获得编码x-diff和y-diff所需的比特数,根据比特数确定偏置模型的偏差,根据该比特数获得最终成本函数值 将成本函数值与偏差之间的差异,将最终成本函数值与预定容限限制进行比较,将假定运动矢量(x,y)确定为当前宏块的运动矢量,并通过使用成本函数 值,如果成本函数值小于预定容许限度,并且如果成本函数值不小于预定容许限度,则丢弃假设的运动矢量(x,y)。 所公开的方法成功地提高了压缩率。
    • 15. 再颁专利
    • Error prevention method for multimedia data
    • 多媒体数据的错误预防方法
    • USRE40661E1
    • 2009-03-10
    • US09996086
    • 2001-09-21
    • Dong-seek ParkJohn VillasenorFeng ChenMax LuttrellBrendan Dowling
    • Dong-seek ParkJohn VillasenorFeng ChenMax LuttrellBrendan Dowling
    • G06F11/00
    • H04L1/0059H03M13/00H03M13/23H03M13/35H03M13/6306H03M13/6375H04L1/0045H04L1/0068H04L1/1816H04L1/1819H04L1/1825H04L1/1845
    • An error protection method for multimedia improves data recovery and channel throughput in channels which cause a random error and a burst error by using a rate compatible punctured convolutional code (RCPC) and an automatic retransmission on request (ARQ). In a process of decoding a plurality of packets of given information, the error protection method includes the steps of a) decoding one of the plurality of packets, b) decoding another packet when an error occurs during the decoding in step a), c) decoding a combination of the packets from steps a) and b) or a third packet when an error occurs in step b), and d) repeating step c) until the decoding error no longer occurs. The error protection method has the characteristics of both Type-1 and Type-2 ARQ methods. Therefore, one can obtain constant channel throughput in a channel containing burst errors, a channel containing random errors, and a channel in which the two types of error patterns coexist simultaneously.
    • 用于多媒体的错误保护方法通过使用速率兼容的穿孔卷积码(RCPC)和根据请求的自动重发(ARQ)来改善导致随机错误和突发错误的信道中的数据恢复和信道吞吐量。 在解码给定信息的多个分组的过程中,所述错误保护方法包括以下步骤:a)对所述多个分组中的一个进行解码; b)在步骤a)中的解码期间发生错误时对另一分组进行解码; c) 在步骤b)中解码来自步骤a)和b)或第三分组的分组的组合,以及d)重复步骤c),直到解码错误不再发生。 错误保护方法具有Type-1和Type-2 ARQ方法的特点。 因此,可以在包含突发错误的信道,包含随机错误的信道以及两种类型的错误模式同时共存的信道中获得恒定的信道吞吐量。