Abstract: A charging and patrol replacement system for air-land unmanned aerial vehicles and a method thereof. In the system, an unmanned aerial vehicle in flight continuously detects a remaining battery power thereof, and when the remaining battery power is lower than a threshold, the unmanned aerial vehicle generates and transmits a return-to-home signal to an unmanned ground vehicle, the unmanned ground vehicle continuously transmits a coordinate of a power supply vehicle to the unmanned aerial vehicle in flight, to guide the unmanned aerial vehicle in flight to return to the power supply vehicle for charging, and the unmanned ground vehicle then activates another unmanned aerial vehicle to synchronize patrol data with the unmanned aerial vehicle which is returned to charge, so as to replace the returned unmanned aerial vehicle to perform patrol, thereby achieving the technical effect of improving the sustainability and synergy of the air-land unmanned vehicles.

Abstract: A method and apparatus for video live streaming process are provided. The method may include obtaining a feature image preset for a service process, the feature image being an image block that identifies the service process, obtaining a video screenshot from a video live streaming data stream according to a screenshot interval, detecting whether the feature image exists in the video screenshot, and outputting the video screenshot based on the feature image being detected in the video screenshot.

Abstract: A method and apparatus for video live streaming process are provided. The method may include obtaining a feature image preset for a service process, the feature image being an image block that identifies the service process, obtaining a video screenshot from a video live streaming data stream according to a screenshot interval, detecting whether the feature image exists in the video screenshot, and outputting the video screenshot based on the feature image being detected in the video screenshot.

Abstract: Solid-phase copolymers of 4-vinylpyridine or 4-vinylpyridine 1-oxide may be employed as catalysts in the formation of acid anhydrides. A water soluble polymer of 4-vinylpyridine 1-oxide may also be employed as a catalyst in the formation of acid anhydrides.