To ensure security in the commercial and domestic sectors, innovative technologies are used. They help to conduct static observation of what is happening around and respond to every event that happens. For this purpose, a camera with a motion sensor is used.
Using cameras with a motion sensor
For safety reasons, special devices are used that respond to the movement of an object located in the field of view of the device. As soon as some movements appear nearby, they begin to record information. In this case, the reaction manifests itself instantly. A device is installed on the streets to monitor the situation, in the security systems of shops, government agencies, private houses.
Choosing such a device is required taking into account its technical characteristics and the tasks that it will perform. Some cameras have a microphone with a different sensitivity threshold. Information is recorded on a memory card inside the device, or on a server.
Unlike other cameras
The main difference between such a device and other types of recording devices is the principle of operation. Recording starts if a moving object enters the field of action of the sensor. Such cameras are installed in places where there is not a very intense flow of people.
In the absence of movement, the device is in standby mode. This time is 240 hours. Expensive cameras can be adjusted so that they do not work just like that. You can also exclude some movements that the device will not respond to. This will save space on the storage medium.
Types of cameras with motion sensors and characteristics
Surveillance cameras with motion sensor and recording are analog and digital. They are intended for installation on the street or inside the building.
Analog
Analog-type equipment is characterized by the presence of an additional storage medium, which is connected separately. There is no motion sensor in them. Motion is detected by a software function. It is fixed by the DVR.
The principle of the apparatus is simple. The video stream is sent to the DVR. There it is divided into the same number of squares. After that, the analysis of the color flow. Thus, movement is detected due to significant changes in the squares.
Digital
Digital camcorders are more popular. They shoot in high resolution. In such a device there is a memory card for recording data or a hard disk.
Swivel
For such devices, the automation is adjusted so as to notice a change in pixels in a certain section of the frame. Noticing any movement, the camera rotates in this area. As soon as the object leaves the coverage area, the camera returns to its original position.
These devices feature automatic patrols. To do this, configure their movement along a specific route. In this case, there may be several dozen programs. As soon as the device reaches mechanical restriction of movement, it rotates in the opposite direction. PTZ cameras are additionally equipped with infrared light, can respond not only to movement, but also to sound.
Install such devices on the street or in the building. They are domed or spherical in shape.
Often the case is made of durable material that is resistant to mechanical damage. However, the rotary mechanism is located outside, therefore, it is influenced by external negative factors. This can disable the device, in connection with this, it is better to install it in the house.
Outdoor cameras
Devices for outdoor observation are color and black and white. The second option is more expensive. Such cameras are shot day and night, and the image quality in expensive models is equally good. Black and white devices give a clearer picture in low light conditions.
Outdoor devices can withstand frost or heat. Their case is durable, dust does not get inside, so the service life of the device does not depend on the influence of external conditions. These cameras are expensive. There are also cheap options, but they can be easily broken. Before using the outdoor camera, you need to determine exactly where it will be installed.
These devices are intended for round-the-clock monitoring of the guarded object. Miniature cameras are used for covert shooting. For the correct device selection, the following parameters are taken into account:
- Body shape. For tracking a large area more suitable body products.
- Matrix Resolution It affects the quality of shooting and image detail. The optimal indicator is 1-2 megapixels.
Outdoor camcorders need to be bought taking into account the cost. Cheap options will not last long.
Indoor cameras
Internal chambers are designed for apartments, porches or cottages. They are characterized by high quality shooting. The motion sensor in such devices is especially relevant.
IP cameras
The main feature of the IP camera is an integrated network interface, as well as a web server. It can be connected to any Internet network. With the help of such a device, it is possible to record data and transmit them to any point on the planet. They are often used in security surveillance systems. Devices are equipped with additional devices:
- microphone (it is intended for speakerphone);
- speaker (recorded video can be viewed with sound).
You can connect any other sensors to the device. It can automatically send messages to e-mail, connects to the modem. You can use special software or a standard browser to work with them.
Access to the IP camera can be individual or shared. The first option is used in security systems. The second is used in public places, close to attractions.
Motion Detection Implementation Methods
Motion sensors are hardware and software. They differ in the method of determining motion.
Software method
The software method is used in new models of video cameras. The optical signal on the photosensitive matrix is converted into a digital image. The program reports about changes in the frame depending on the change in the light flux. Pictures are compared among themselves, after which the movement is determined.
For expensive systems characterized by the use of intelligent software. It supports video analytics. Some camera models pre-process frames, automatically capture the video stream.
The disadvantage of this method is the low efficiency of work over long distances. Outdoor cameras record a large number of false movements that are caused by changes in lighting, and at night, an increase in the sensitivity of infrared illumination.
It is better to use devices with a software method for detecting movements indoors.Notifications of any movements can take place on the phone. Software sensors are more suitable for large areas.
Hardware method
Some cameras use a hardware-based detection method. Moreover, such a sensor is separate from the camera. It can be wired or wireless. In the first case, the signal and power are transmitted by wire. The second option requires Wi-Fi or a radio signal. More popular are models with wireless sensors.
Advantages and disadvantages of cameras with motion sensors
Many cameras with motion sensors are autonomous. Such devices have the following advantages:
- only selected moments are recorded, which can significantly save space on the storage medium, reduce video viewing time, filter out unnecessary frames;
- the ability to save data in high quality - you can consider the smallest details;
- species diversity: can be chosen for indoor or outdoor observation;
- advanced functionality and usability;
- the possibility of long-term work in stand-alone mode, if the model is equipped with a battery;
- there is no need to install a separate server on which data will be stored, since you can pick up a device equipped with a large memory card;
- small size, which allows you to install the camera in hard to reach places, hidden areas.
Any camera for video surveillance is able to record information with minimal movement of the object.
The equipment has certain disadvantages:
- There is the possibility of remote damage to property, since data recording begins only at the moment the object begins to move in the field of view of the device.
- If the sensor sensitivity is not set correctly, the device automatically turns on when small animals caught in the wind are caught in the tracking area. With frequent switching on, the equipment resource decreases.
The device is adjusted manually or automatically. The efficiency of the camera will be higher in those places where people’s passability is low.
Features of installation and setup
It is necessary to install the equipment at a considerable height so that no one can remove it intentionally. In the tracking area should not be objects or objects that block the view of the camera itself, as well as the motion sensor. The device must control windows, attic hatches, emergency exits, fire escape and other points through which attackers can enter the building. Adjustment allows you to configure the following parameters:
- The resolution of the picture.
- Type of record, time of its beginning. It can be conducted continuously or included only in the presence of movement. You can enable video recording only at night.
- The choice of storage location. It all depends on the quality of the picture. If the recording is inconsistent and the image resolution is low, just use a memory card. Professional systems transmit data on the server. Storage time is also optional.
- Receive alerts. If movement is detected, messages can be sent by e-mail or SMS.
- Access setting.
Cameras for surveillance systems equipped with a motion sensor are the best option for tracking residential or summer houses, streets with a small flow of people. For their work, a large amount of information medium is not required, because information is transferred directly to the server. Thanks to the advanced functionality, it is possible to make various settings, watch videos with sound or just the right frames.
