Methods A sample survey based on stratified probabilitysamples of 2 204 students aged 12~21 years old among 11 schools in four districts of Shanghai was carried out.
In the process, we calculate the posterior probability of semantics by unlabeled samples information.
在计算的过程中,使用了未标记样本的信息计算语义出现的后验概率。
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The background samples are chosen by thresholding inter-frame differences, and the Gaussian kernel density estimation is used to estimate the probability density function of background intensity.