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In the analysis and processing of massive surveillance videos, target behavior recognition is an important task. Most researchers pay more attention to the lightweight of convolution operators in intelligent recognition systems or increase the complexity of lightweight modules, but lack of lightweight research on point-by-point convolution modules which occupy a large number of parameters and computation. For this reason, this article carries out the research on intelligent recognition of key frame target behavior in video surveillance based on lightweight convolution neural network. The three-dimensional position information of bone joints is extracted as the target behavior feature. Based on local vector aggregation descriptor, it makes a more compact representation of key frames of the surveillance video, and gives the generation process of local vector aggregation descriptor. After the structured pruning of the filter, the memory occupation of the processed network model is significantly reduced, and the lightweight of the model is realized. Experimental results verify the effectiveness of the model.

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The design illustrates the working principle of the spring cold warning system in kiwifruit orchards, develops a warning scheme based on the Internet of Things and wireless sensor networks, establishes a three-dimensional model of the frame structure of the kiwifruit orchard and the wind-blocking device through SolidWorks software, and selects a heat sink and a heat regulating device according to the actual planting environment. The design was simulated using the CIIC IOT comprehensive experimental platform. The experimental results showed that the system performed well, all the designed functions could be realized, the sensing module data collection was accurate when the outdoor temperature decreased to 1°C, and the controlled motor, electric heating module and fan could start normally, which verified the feasibility and practicality of the kiwifruit orchard spring cold warning system and provided a theoretical basis for the actual future kiwifruit orchard It provides a theoretical basis for future practical construction of kiwifruit orchards.