中文说明：从视频图像序列中，每隔一定间隔提取出一幅图像，并采用中值法提取背景图像
English Description：
From the video image sequence, an image is extracted every certain interval, and the background image is extracted by median method
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中文说明：从视频图像序列中，每隔一定间隔提取出一幅图像，并采用中值法提取背景图像
English Description：
From the video image sequence, an image is extracted every certain interval, and the background image is extracted by median method