One is based on the accumulative difference vector and the other is based on the use of run-length encoding.
一种是利用差累积向量，另一种是利用持续行程编码。
There was no significant difference of CTX accumulative quantity between these three groups when disease activity scoring decreased to 50% ( P > 0. 05).
病情活动性积分下降至50％时，三组CTX累积量无显著性差异（P>0.05）。
Firstly, a rough motion mask is obtained by introducing a motion area segmentation method based on an improved accumulative frame- difference algorithm and optimal threshold segmentation.
利用小波包分析算法提取出单帧图像的边缘信息并获得细化的目标区域边缘图；
Firstly, a rough motion mask is obtained by introducing a motion area segmentation method based on an improved accumulative frame- difference algorithm and optimal threshold segmentation.
利用小波包分析算法提取出单帧图像的边缘信息并获得细化的目标区域边缘图；
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