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In order to make the background model of expressway traffic image robust[16], the parameters in the mixed Gaussian model need to be updated constantly. Therefore, at time t, the new pixel value 𝑋_𝑡 of the expressway traffic image is compared with the mean value of the current N Gaussian distributions, then the Gaussian distribution model matching the new pixel value 𝑋_𝑡 of the expressway traffic image is found. That is, the mean deviation of the Gaussian distribution model is in the range of 2.5¥ò.
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