The correct answer is B because video synopsis is designed to compress long-duration video into a shorter, information-dense presentation by extracting moving objects and reorganizing their activity over time. The material explains the workflow clearly: “Moving object detection involves algorithms such as background modeling, scene segmentation, and moving object extraction” , then “Object trajectory extraction involves object tracking algorithms such as TLD and KCF” , and finally “Generate a compact video. That is, fuse the target trajectory set and background image into frames, and combine frames into video”
This directly matches option B .
The same section also demonstrates the practical benefit by stating that “The video synopsis feature compresses the original 24-hour-long video into a 3.5-hour video”
From an intelligent vision operations perspective, this greatly improves investigation efficiency because users can review suspicious activity faster without watching the full original recording. Option A describes local zoom behavior, not synopsis. Option C is incorrect because synopsis does not turn video into still images. Option D is the opposite of synopsis, since synopsis reduces manual review effort rather than depending on it.
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