Abstract:
The present invention is to provide a method applicable to a player of a network video recorder for accelerating history playback and event locking, wherein the player decompresses a compressed file of recorded images when performing history playback of the recorded images, flags the resulting frames with “changed” or “unchanged”, depending on whether variation in image data traffic between the successive frames reaches a certain degree, and then sequentially plays the images of the successive frames on a monitor at different playing speeds which are set in the player and correspond to the successive “changed” and “unchanged” frames respectively. Thus, not only is the time required for history playback significantly shortened, but also a monitoring person is enabled to rapidly see, from among large amount of played back image data, the small number of images that demand attention and to greatly reduce the time, energy and effort required while monitoring.
Abstract:
The present invention provides a relay-based foolproof circuit for over-voltage protection, which is electrically connected between a plug and an electric device, and includes a relay having at least one magnetic core, a coil wound around the magnetic core and two reed switches each having a reed and being normally in a closed state because of the elastic effect of its reed. The relay-based foolproof circuit is able to provide AC power of a first specification (e.g., 110 V AC power) received from the plug to the electric device. However, when AC power of a second specification (e.g., 220 V AC power) greater than the first specification flows through the coil, the coil causes the magnetic core to generate a magnetic force great enough to drive the two reed switches into an open state for stopping the AC power of the second specification from being provided to the electric device.
Abstract:
The present invention is to provide a chassis switch, which comprises a chassis for accommodating a designated number of line cards therein; a backplane installed on the back side of the chassis and having a plurality of connectors disposed thereon; at least one line card plugged into one of the connectors corresponding thereto via a front side of the chassis and each having an access switch chip adapted to switch local network signals and an interconnect switch chip adapted to switch the signals between ports of the at least one line card; and a loop adapted to connect the corresponding ports of the access switch chip and the interconnect switch chip respectively through the connectors, so as to enable each line card plugged into the chassis switch to perform a local network switching function and a switching function between the at least one line card.
Abstract:
An IP camera includes a camera unit for picking up images of a target object; a wireless signal processing unit for transmitting an intelligent monitoring ng a wireless signal to the target object and receiving a scattering wireless signal reflected from the target object; and a signal processing unit electrically coupled to the camera unit and the wireless signal processing unit for receiving a data corresponding to the image of the target object from the camera unit and a data corresponding to the scattering wireless signal reflected from the wireless signal processing unit. The signal processing unit analyzes the data corresponding to the image of the target object to obtain a status ate information and generates a reference signal according to the status information, and the reference signal is processed together with the data corresponding to the scattering wireless signal by the signal processing unit to generate a change detection signal.