CN113890991A - Privacy protection method and device applied to high-altitude parabolic detection - Google Patents
Privacy protection method and device applied to high-altitude parabolic detection Download PDFInfo
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Abstract
The embodiment of the application provides a privacy protection method and device applied to high-altitude parabolic detection, which are used for shielding and protecting user privacy when a high-altitude parabolic event is not detected and completely restoring the event when the high-altitude parabolic event is detected. The method comprises the following steps: acquiring an original video stream in a monitoring area, and carrying out privacy shielding on the original video stream to obtain a shielded video stream, wherein the shielded video stream is used for real-time monitoring; if the high-altitude parabolic event is detected, splicing an original video stream in a first time length after the first time when the high-altitude parabolic event is detected and an original video stream in a second time length before the first time to obtain an event recorded video, wherein the event recorded video is used for tracing the high-altitude parabolic event.
Description
Technical Field
The application relates to the technical field of security monitoring, in particular to a privacy protection method and device applied to high-altitude parabolic detection.
Background
Along with the current urbanization degree is higher and higher, high-rise buildings are more and more, and high-altitude parabolic behavior becomes a great potential safety hazard, so that the environment is polluted, ground facilities are damaged, and the personnel safety on the ground is threatened. At present, many high-rise buildings are provided with high-altitude parabolic intelligent detection cameras for treatment and deterrence and after-the-fact pursuit. However, since the camera generally needs to be aimed at a high-rise building balcony or window for monitoring, a picture in the building room may be captured, which may cause a risk of revealing privacy security of the low-rise building personnel.
Disclosure of Invention
The embodiment of the application provides a privacy protection method and device applied to high-altitude parabolic detection, which are used for shielding and protecting user privacy when a high-altitude parabolic event is not detected and restoring the high-altitude parabolic event when the high-altitude parabolic event is detected.
In a first aspect, an embodiment of the present application provides a privacy protection method applied to high altitude parabolic detection, where the method includes:
acquiring an original video stream in a monitoring area; carrying out privacy occlusion on the original video stream to obtain an occlusion video stream, wherein the occlusion video stream is used for real-time monitoring;
if the high-altitude parabolic event is detected, splicing an original video stream in a first time length after the first time when the high-altitude parabolic event is detected and an original video stream in a second time length before the first time to obtain an event recorded video, wherein the event recorded video is used for tracing the high-altitude parabolic event.
In one possible design, the original video stream in the second duration before the current time is buffered.
In one possible design, if a high altitude parabolic event is detected, privacy blocking of the original video stream is stopped for a first duration after the first time.
In one possible design, the first time period and the second time period are determined based on a height of a building in the monitored area.
In one possible design, the original video stream is subjected to privacy blocking according to one or more preset privacy exposure areas in the monitoring area.
In one possible design, real-time monitoring and storage is performed based on the occlusion video stream.
In a second aspect, an embodiment of the present application provides a high altitude parabola detection apparatus, including:
the acquisition module is used for acquiring an original video stream in a monitoring area;
the processing module is used for carrying out privacy shielding on the original video stream to obtain a shielded video stream, and the shielded video stream is used for real-time monitoring;
if the high-altitude parabolic event is detected, splicing an original video stream in a first time length after the first time when the high-altitude parabolic event is detected and an original video stream in a second time length before the first time to obtain an event recorded video, wherein the event recorded video is used for tracing the high-altitude parabolic event.
In a third aspect, an embodiment of the present application further provides a computing device, including:
a memory for storing program instructions;
a processor for calling the program instructions stored in said memory and for executing the method as described in the various possible designs of the first aspect according to the obtained program instructions.
In a fourth aspect, embodiments of the present application also provide a computer-readable storage medium, comprising computer-readable instructions, which, when read and executed by a computer, cause the computer to perform the method as set forth in the various possible designs of the first aspect.
In the embodiment of the application, when the high-altitude parabolic event is not detected, privacy shielding can be performed on the obtained original video stream in the monitoring area, and real-time monitoring is performed by using the shielded video stream subjected to privacy shielding, so that the effect of protecting the privacy of a user when the high-altitude parabolic event does not occur is achieved. When a high-altitude parabolic event is detected, splicing an original video stream in a first time length after the first time when the high-altitude parabolic event is detected and an original video stream in a second time length before the first time in the obtained monitoring area to generate an event recording video, so that the occurring high-altitude parabolic event complete process can be traced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a privacy protecting apparatus applied to high altitude parabolic detection according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a camera or NVR device in a privacy protecting apparatus applied to high altitude parabolic detection according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a privacy protection method applied to high altitude parabolic detection according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a privacy-obscured area in an embodiment of the application;
fig. 5 is a schematic diagram of a video stream in a privacy protection method applied to high altitude parabolic detection according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another privacy protecting apparatus applied to high altitude parabolic detection according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, the following two schemes are mainly used for detecting the high altitude parabola:
scheme 1: two parts of video streams are obtained by adopting a binocular camera, one part is subjected to privacy shielding, and the other part is subjected to real-time high-altitude parabolic event detection. And deciding whether to send the occlusion video or the original video according to the user permission level. However, the scheme uses a binocular camera, so that the cost is high, a user with high authority can still obtain the original video stream, and the privacy protection effect cannot reach the best effect.
Scheme 2: the method comprises the steps of detecting sensitive targets (such as human faces and human bodies) and whether high-altitude parabolic events occur or not by using a high-end intelligent camera through a real-time algorithm, judging whether the sensitive targets are associated with the high-altitude parabolic event tracks or not, and carrying out privacy shielding protection on the non-associated sensitive targets. However, the scheme has high requirements on the performance of the camera, and needs additional algorithm capability for detecting all sensitive targets in the picture and judging whether the sensitive targets are associated with the high-altitude parabolic track, so that the common high-altitude parabolic detection camera cannot perform the detection.
This scheme is through single monocular camera, just can realize the protection that the privacy sheltered from, and need not to consume extra intellectual detection system ability for performance requirement greatly reduced to the camera, and the cost is also lower.
Fig. 1 schematically shows a structure of a privacy protecting apparatus for high altitude parabolic detection, to which an embodiment of the present invention is applicable, and the privacy protecting apparatus for high altitude parabolic detection 100 may include a photographing device 110 and a monitoring device 120.
The shooting device 110 is configured to shoot a video image of a monitored area, determine whether a high altitude parabolic event occurs, and send a blocked video stream or an original video stream to the monitoring device 120 according to a determination result.
The photographing apparatus 110 and the monitoring apparatus 120 may have a structure as shown in fig. 2, including a processor 210, a communication interface 220, and a memory 230.
The processor 210 is a control center of the device, connects various parts of the entire device using various interfaces and routes, and performs various functions of the device and processes data by executing programs or instructions stored in the memory 130 and calling data stored in the memory 130. Alternatively, processor 110 may include one or more processing units.
The communication interface 220 is used for the device to communicate with other devices, receive and transmit information transmitted by other devices, and implement communication. The memory 230 is used to store programs or instructions, and necessary data. For example, the memory 230 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to a business process, and the like. Further, memory 230 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
It should be noted that the above illustration is only an example of the structure of the high altitude parabola detection apparatus, where the shooting device may be a camera (e.g., a monocular camera), a video camera, and the like, and the monitoring device may be a Network Video Recorder (NVR) having a display screen or connected to the display screen, and the embodiment of the present application is not limited thereto. The technical scheme of the application is described in detail below by taking the shooting device as a monocular camera and the monitoring device as NVR device as an example.
Fig. 3 exemplarily illustrates a privacy protection method applied to high altitude parabolic detection, which may be performed by a privacy protection apparatus applied to high altitude parabolic detection, and the privacy protection apparatus applied to high altitude parabolic detection may include a camera and an NVR device, according to an embodiment of the present application.
As shown in fig. 3, the method includes:
step 301, obtaining an original video stream in a monitoring area, and performing privacy blocking on the original video stream to obtain a blocked video stream, where the blocked video stream is used for real-time monitoring.
Illustratively, the camera may capture in real time an original video stream within the monitored area from which high altitude parabolic event detection is performed. And if the high-altitude parabolic event is not detected, carrying out privacy occlusion on the original video stream to obtain an occlusion video stream, and then sending the occlusion video stream to the NVR equipment for real-time monitoring. Optionally, the NVR device may further store the occlusion video stream and record related information.
The privacy blocking may be performed by blocking, for example, performing mosaic processing or the like, a picture of one or more areas with privacy exposure risks preset in a monitored area captured in an original video stream. The area at risk of privacy exposure may also be referred to as a privacy-obscured area, or possibly a parabolic area, which may be pre-set in the camera before shooting, so that the camera may perform corresponding processing after shooting the original video stream.
That is, before step 301 is implemented, a camera may be installed in the monitored area, and the raw video stream may be captured by the camera. Typically, the monocular camera is mounted near the floor of the building, angled upward, and covers all possible points of the building (e.g., balconies, windows, etc.). In order to avoid privacy exposure of the following layers of people caused by the installation mode of the monocular camera, after the position of the monocular camera is fixed, a privacy-blocking area can be arranged on the monocular camera in advance, as shown in fig. 4, and the privacy-blocking area can comprise one or more possible parabolic point areas (such as windows, balconies and the like). Therefore, after the original video stream is shot by the camera, the camera can shield the picture of the privacy shielding area in the monitoring area in the video stream so as to ensure the privacy safety of the personnel at the low floors, and all areas with privacy exposure risks in the video stream which is sent to the NVR device by the camera for monitoring are in a shielded state under normal conditions.
Step 302, if a high-altitude parabolic event is detected, splicing an original video stream within a first time length after the first time when the high-altitude parabolic event is detected and an original video stream within a second time length before the first time to obtain an event recording video, wherein the event recording video is used for tracing the high-altitude parabolic event.
For example, the camera may buffer an original video stream within a past set time range and delete the original video stream buffered in the past beyond the set time range. For example, the original video stream within the second duration before the current time is buffered while the buffered original video stream within the second duration before the current time is deleted.
The camera may further send the cached original video stream within a second time period before the first time to the NVR device, and the NVR device splices the received original video stream within the first time period after the first time with the received original video stream within the second time period before the first time to obtain an event recorded video, and records and stores the event recorded video, for example, the event recorded video and the related information such as the occurrence time and the location of the high altitude parabolic event are stored correspondingly.
Optionally, if the high-altitude parabolic event is detected, the camera may stop privacy shielding of the original video stream within a first time period after the first time, and send the original video stream within the time period to the NVR device for real-time monitoring and storage to restore a complete process of the high-altitude parabolic event, so as to facilitate subsequent follow-up. This step may also be understood as turning off the privacy-obscuring function for a first period of time after the first time. In the embodiment of the application, it is considered that the high-altitude parabolic detection algorithm needs to recognize the trajectory after a period of time to determine whether the event is a real high-altitude parabolic event, for example, false alarms generated by scenes such as bird transverse flying and the like need to be eliminated. Thus, when the camera detects a high altitude parabolic event, the high altitude parabolic event may have just occurred or may have occurred for some time. Therefore, setting the first and second durations facilitates the complete process of recovering the high altitude parabolic event. The first and second time periods may be determined based on the height of the building within the monitored area.
For example, the first time period and the second time period may be set to 10 seconds each. The 10 seconds may be determined from a regular estimate of free fall. Assuming that a typical high-rise building has 30 floors and a height of about 100m, 1/2gt is obtained according to the formula of free fall2(g≈9.8m/s2) The time consumed by the reverse extrusion is that the most time is for the building to fall from the top to the ground
Considering that the actual parabolic process is influenced by other factors, such as air resistance and the like, the object falling process is not completely free-fall movement, so that the actual time from the moment that the object is thrown to the ground is greater than the calculated theoretical time, and therefore, the slow speed is set hereThe video storage time is 10 seconds, and the original video stream of 20 seconds can cover the whole process of object falling by adding the 10 seconds of video after the high-altitude parabolic event is detected, so that complete video evidence is provided for follow-up after the event.
As shown in fig. 5, assuming that a high-altitude parabolic event occurs at time t-s, after s seconds of parabolic track recognition, the camera confirms that the high-altitude parabolic event is detected at time t, and the thrown object may have landed or may still move in the air. If the thrown object has landed, the whole process of the high altitude parabolic event can be recorded by the original video stream of 10 seconds between the time t-10 and the time t. If the thrown object moves in the air, the original video stream with the time length of 20 seconds between the time t-10 and the time t +10 can record the whole process of the high altitude parabolic event.
It should be noted that setting the first and second time periods to 10 seconds is only one example provided herein. The first duration and the second duration may be adaptively adjusted according to the height of the building in the monitored area and the calculation speed of the high altitude parabolic detection algorithm, and the first duration and the second duration may be the same or different, which is not limited in the present application. For example, the second time period may be set to be greater than 10 seconds.
Optionally, the event recording video of the high-altitude parabolic event is obtained, and meanwhile, the related information of the high-altitude parabolic event is recorded, and the related information is associated with the event recording video. The related information can comprise information such as the occurrence time of an event, the event type and the like, and the related information is related to the event recording video, so that the video can be retrieved, played back and backed up in various modes such as the occurrence time, the event type and the like.
In the embodiment of the application, the area of the privacy exposure risk needing to be shielded is preset in the camera, so that under normal conditions, the video which is sent to the NVR equipment and used for real-time monitoring and storage is the video which is shielded through the privacy, the video which is shielded through the privacy cannot be recovered, only after a high-altitude event is detected, the NVR equipment can receive the video which is not shielded through the privacy and contains about 20s in total in the event occurrence process, the video is taken as evidence for tracing the post-event high-altitude parabolic event, the camera with the high-altitude parabolic detection function is used, and the privacy can be shielded and protected.
Fig. 5 is a schematic diagram of a video stream in a privacy protection method applied to high altitude parabolic detection according to an embodiment of the present application. The method comprises the steps that an original video stream is shot by a camera in a monitoring area and used for detecting a high-altitude parabolic event in real time, if the high-altitude parabolic event is not detected, privacy shielding is conducted on the original video stream in the camera to obtain a shielded video stream, the shielded video stream is coded to obtain a coded video stream after privacy shielding, and the coded video stream is sent to NVR equipment, wherein redundant information in video data can be removed through coding the video stream, and then the storage space of a video file is reduced. And when a high-altitude parabolic event is detected at the time t, stopping privacy shielding of the original video stream for 10s from the time t, and encoding the original video stream 10s after the time t to obtain 10s of encoded streams without privacy shielding and sending the encoded streams to the NVR equipment. In the whole shooting process, the camera simultaneously caches 10s of original video data in the camera, and when a high-altitude parabolic event is detected at the time t, the camera sends a 10s coded original video stream before the time t to the NVR device. After receiving the original video stream coded 10s before the time t and the coded stream without privacy blocking 10s after the time t, the NVR device splices the two sections of videos to obtain a section of video data without privacy blocking from the time t-10 to the time t +10 for 20s, and covers the whole high-altitude parabolic event overall process to serve as a video evidence for high-altitude parabolic pursuit.
In order to better explain the embodiment of the present invention, the following describes the process of high altitude parabolic detection in a specific application scenario. This process is implemented by the camera in cooperation with the NVR device, wherein the camera is operable to: shooting an original video in a monitoring area, detecting whether a high-altitude parabolic event occurs, carrying out privacy shading on the original video stream, and caching the original video stream for 10 seconds; the NVR device may be used to: real-time preview and storage of monitoring videos, splicing of the videos, storage of high-altitude parabolic event videos and correlation of related information.
The high-altitude parabolic detection process specifically comprises the following steps:
1) after the position of the monocular camera is fixed in the monitoring area, an area which needs to be shielded and has privacy exposure risk is preset on the monocular camera. The privacy-blocking area is set as shown in fig. 4.
2) And in the normal monitoring process, the monocular camera shoots to obtain the picture in the monitored area to obtain the original video stream.
3) And the monocular camera performs high-altitude parabolic event detection according to the original video stream.
4) And when the high-altitude parabolic event is not detected, the monocular camera continuously sends the shielding video stream obtained through privacy shielding to the NVR end.
5) When the high-altitude parabolic event is detected, the monocular camera immediately stops blocking the privacy of the original video stream for 10 seconds, the 10-second original video stream is sent to the NVR end, and meanwhile the monocular camera sends the cached original video stream which is 10 seconds before the high-altitude parabolic event is detected to the NVR end.
6) And the NVR end receives the 10-second original video stream after the high-altitude parabolic event is detected and the 10-second original video stream before the high-altitude parabolic event is detected, and splices the two sections of video streams to obtain a complete event recording video of the 20-second high-altitude parabolic event, and meanwhile, the NVR equipment associates the related information of the high-altitude parabolic event with the event recording video. Wherein the video stream of the whole process is shown in fig. 5.
In the embodiment of the application, in the normal monitoring process, videos received by the NVR device are all videos which are subjected to privacy shielding, and the videos which are not subjected to privacy shielding cannot be recovered, and only when a real high-altitude parabolic event is detected to occur, the NVR device receives the videos which are not subjected to privacy shielding and contain 20s of the event occurrence process in total, and the videos are used as evidence for follow-up of the high-altitude parabolic event. This application just can realize the protection of sheltering from to the privacy with the help of single camera, and do not increase under the circumstances of extra computing power, requires lowly to camera performance, can effective reduce cost.
Based on the same concept, the embodiment of the present application further provides a privacy protection apparatus applied to high altitude parabolic detection, and the apparatus may be configured to perform the methods described in steps 301 to 304.
Fig. 6 exemplarily illustrates a privacy protecting apparatus applied to high altitude parabolic detection provided by an embodiment of the present application, and as shown in fig. 6, the apparatus includes:
an obtaining module 601, configured to obtain an original video stream in a monitored area;
the processing module 602 is configured to perform privacy occlusion on an original video stream to obtain an occlusion video stream, where the occlusion video stream is used for real-time monitoring;
and if the high-altitude parabolic event is detected, splicing the original video stream in a first time length after the first time when the high-altitude parabolic event is detected and the original video stream in a second time length before the first time to obtain an event recorded video, wherein the event recorded video is used for tracing the high-altitude parabolic event.
In one possible design, the processing module 602 is further configured to buffer the original video stream for a second duration before the current time.
In one possible design, the processing module 602 is further configured to stop privacy-blocking the original video stream for a first duration after the first time if the high altitude parabolic event is detected.
In one possible design, the first time period and the second time period are determined based on a height of a building within the monitored area.
In one possible design, the processing module 602 is further configured to perform privacy blocking on the original video stream according to one or more areas with privacy exposure risks preset in the monitoring area.
In one possible design, the processing module 602 is further configured to perform real-time monitoring and storage according to the occlusion video stream.
Based on the same concept, an embodiment of the present application further provides a computing device, including:
a memory for storing program instructions;
and the processor is used for calling the program instruction stored in the memory and executing the high-altitude parabolic detection method according to the obtained program instruction.
Based on the same concept, embodiments of the present application further provide a computer-readable storage medium, which includes computer-readable instructions, and when the computer-readable instructions are read and executed by a computer, the computer-readable storage medium causes the computer to execute the high altitude parabolic detection method.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. A privacy protection method applied to high altitude parabolic detection is characterized by comprising the following steps:
acquiring an original video stream in a monitoring area;
carrying out privacy occlusion on the original video stream to obtain an occlusion video stream, wherein the occlusion video stream is used for real-time monitoring;
if the high-altitude parabolic event is detected, splicing an original video stream in a first time length after the first time when the high-altitude parabolic event is detected and an original video stream in a second time length before the first time to obtain an event recorded video, wherein the event recorded video is used for tracing the high-altitude parabolic event.
2. The method of claim 1, further comprising:
and caching the original video stream in the second time length before the current time.
3. The method of claim 1, further comprising:
and if the high-altitude parabolic event is detected, stopping privacy blocking on the original video stream within a first time length after the first time.
4. A method according to any one of claims 1 to 3, wherein the first and second periods of time are determined in dependence on the height of buildings within the monitored area.
5. The method of claim 1, further comprising:
and carrying out privacy occlusion on the original video stream according to one or more preset areas with privacy exposure risks in the monitoring area.
6. The method of claim 1, further comprising:
and monitoring and storing in real time according to the shielding video stream.
7. A privacy protection device applied to high altitude parabolic detection is characterized by comprising:
the acquisition module is used for acquiring an original video stream in a monitoring area;
the processing module is used for carrying out privacy occlusion on the original video stream to obtain an occlusion video stream, and the occlusion video stream is used for real-time monitoring;
if the high-altitude parabolic event is detected, splicing an original video stream in a first time length after the first time when the high-altitude parabolic event is detected and an original video stream in a second time length before the first time to obtain an event recorded video, wherein the event recorded video is used for tracing the high-altitude parabolic event.
8. A computing device, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory and for executing the method of any one of claims 1 to 6 in accordance with the obtained program instructions.
9. A computer readable storage medium comprising computer readable instructions which, when read and executed by a computer, cause the computer to perform the method of any one of claims 1 to 6.
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