Prerecording system and method applied to video monitoring
A video monitoring and video technology, which is applied in closed-circuit television systems, TV system components, color TV components, etc., can solve the problems of wasting system storage space and increasing system costs, and achieve the goal of saving storage space and reducing costs Effect
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Embodiment 1
[0021] figure 1 A schematic structural diagram of a pre-recording system in video surveillance according to Embodiment 1 of the present invention is shown; figure 1 As shown, the system includes: N collection modules 10, network switching modules 20, N control recording modules 30 and storage modules 40, wherein,
[0022] Each acquisition module 10 is respectively fixed at the position that needs to be monitored in the monitoring area, and corresponds to the control recording module 30 one by one, and is used to collect video images in the monitoring area, and transmits the video images to the corresponding ones through the network switching module 20. The control recording module 30;
[0023] Each control recording module 30 is connected with the network switching module 20, and is used for when the video picture does not change all the time in the preset period of time, the frame recording video picture, after this, when the video picture has any change, full speed Record ...
Embodiment 2
[0029] figure 2 A schematic structural diagram of a pre-recording system in video surveillance according to Embodiment 2 of the present invention is shown, as shown in figure 2 As shown, the system also includes: a cache module 50, which is connected to the control recording module 30 and the storage module 40 respectively, and is used to temporarily store the video images recorded by the control recording module 30 by frame extraction, and to extract frames within a period of time before the video image changes. The recorded video images are stored in the storage module 40 . The previous period of time mentioned here can be 10S, 5S, etc. The system can set this time period at will, and there is no limitation here.
[0030] For example, when the video picture remains unchanged, the recording module is controlled to draw frames to record the video picture. At this time, the video picture has changed, and the cache module will store the video picture recorded in a period of t...
Embodiment 3
[0033] image 3 A schematic structural diagram of a pre-recording system in video surveillance according to Embodiment 3 of the present invention is shown, as shown in image 3 As shown, the control recording module 30 also includes: a judging unit 302, which is used to judge whether there is a change in the video picture by analyzing the corresponding pixels of the video pictures of two adjacent frames. When the total amount of pixel changes is less than the preset total amount of pixel changes, it can be judged that the video image is unchanged. The screen is changing.
[0034] For example, the total amount of change of pixels corresponding to two adjacent video frames is N, and the preset total amount of pixel change is M. Then, when N is less than M, it means that the video images of two adjacent frames have not changed. When N is greater than or When it is equal to M, it means that the video images of two adjacent frames have changed.
[0035] For another example, if t...
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