This type of panoramic surveillance camera encapsulates multiple sensors. A panoramic effect is obtained by performing an image stitching operation on the split screen. The current mainstream product structure is to package four two-megapixel sensors and an independent short-focus lens with a field angle of 45 ° or 90 ° in a unified housing. The core technologies such as digital processing and compression are integrated on the front-end firmware. Four separate pictures are integrated into 180 ° or 360 ° high-definition panoramic pictures according to user requirements. It is then transmitted to the back-end management platform by the network.
The advantage of the multi-lens stitching panoramic surveillance camera is to some extent get rid of the limitation of the focal length. You can see farther distances under the same conditions. At the same time, it also has a virtual PTZ function, which can achieve functions such as peripheral cutting, intermediate reduction, and maintaining 180 ° unfolding. It is convenient for users to adjust the screen according to the monitoring focus.
Compared with the current mainstream fisheye lens surveillance cameras. Multi-lens stitching panoramic surveillance cameras do not have pixel restrictions. Not to mention the problem of a huge gap between the middle and the edge. Therefore, although the image stitching and compression of surveillance cameras are implemented on the front end. But its speed and network resources occupy very little. This will also be the future development trend of this type of product.
Due to the use of multiple lenses and sensors, the price of such products is higher than that of a fisheye lens panoramic surveillance camera. But the cost is still less than installing multiple traditional surveillance cameras directly. At the same time, it has only one IP address, which is convenient for software authorization to solve the problem.
On the other hand, although such products avoid wasting pixels, the stitching technology has a higher demand for the entire solution. The choice of field of view, how to match each other perfectly in structure. How to achieve better seamless stitching on the algorithm determines whether such products can achieve better development prospects in the future. And because the cooperation of the lens cannot achieve physical perfection. Therefore, it is inevitable that a conical blind area will appear directly below during hoisting.
After improvement, the tilt angle of the internal lens of the surveillance camera can be adjusted according to the site conditions during installation. This reduces the impact of this dead zone to some extent. On the other hand, when the installation height reaches more than three meters (the optimal installation height is three to five meters), the size of the blind zone generated by the surveillance camera is basically similar to the size of the human head, that is, it does not affect the actual monitoring much. .
Fisheye lens panoramic surveillance cameras are the mainstream products in panoramic surveillance cameras. A set of lenses and sensors can achieve the purpose of panoramic viewing. Its camera hardware design has low complexity, long reliability and long service life. Among them, the fisheye lens got its name because its front end bulged like a fisheye. The focal length of a fisheye lens used in a panoramic surveillance camera must be below 2mm. At present, such lens products on the market are relatively mature.
The reason why fisheye lens panoramic surveillance cameras have become high-end technical products lies in the difficulty of processing original distortion. And how to better provide humanized services for back-end monitoring staff. That is, the realization of the two core technologies of image correction and virtual PTZ function. It can be seen from the above that it is these two technologies that determine the development prospects of fisheye panoramic surveillance cameras.
Specifically, as long as there is a fisheye lens, a panoramic image can be obtained in the background. However, this original image is a distorted circular pie chart, which does not meet the normal observation habits of the human eye. Must be corrected to achieve the final two-screen or four-screen monitoring requirements. The virtual PTZ technology gives users a monitoring experience like a dome—without the premise of no dome-like mechanical, electrical, and electronic components, it realizes the key observation, image rotation, and magnification functions of any monitoring point in the observation range.
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