Panoramic surveillance faces new problems at high speed or into a "savior"

With the wide application of security monitoring in various market segments, traditional network cameras have not been able to fully meet the demand for more personalized and higher quality monitoring in various industries. For example, traditional network cameras are limited by the surveillance field of view and cannot monitor a 360-degree panorama with just one network camera. Industry development has a necessary and strong demand for 360-degree panoramic monitoring. While panoramic monitoring meets a wide range of environmental monitoring, it also faces some technical fisheye lenses that are lenses with a very short focal length and a viewing angle close to or equal to 180°. 16mm or shorter focal length lens. It is an extreme wide-angle lens. Its "fish-eye lens" is its common name. In order to maximize the camera's viewing angle, the front lens of this type of lens has a parabolic shape and protrudes toward the front of the lens, which is quite similar to the fish's eyes. The "fish-eye lens" is thus named. The fisheye lens is a special lens in an ultra-wide-angle lens, and its viewing angle strives to reach or exceed the range that human eyes can see. Therefore, there is a big difference between the fisheye lens and the real world scene in people's eyes, because the scene we see in real life is a regular fixed form, and the effect produced by fisheye lens exceeds this category. .

Generally, the viewing angle of the surveillance camera is in the range of 60 degrees to 90 degrees. If all the monitoring requirements of the monitoring field are large, if only a few cameras are installed to achieve coverage of the surveillance area, the camera cost and installation cost will undoubtedly increase. Display and storage costs will increase correspondingly; even if the dome can achieve 360-degree full-range monitoring through the PTZ, it cannot achieve 360-degree monitoring at the same time. In practical applications, most domes are set by setting presets. Bit-by-bit monitoring of the scene makes it difficult to avoid situations where important events are “leak-controlled”.

Fisheye Panorama Camera is a retrofit and upgrade of existing surveillance systems. In the fisheye panoramic monitoring system, only one fisheye panoramic camera is needed to achieve panoramic blind-free area monitoring. Without any mechanical components, the image captures the panoramic image of the monitoring site through the ultra-wide angle fisheye lens, depending on the installation method. , Can achieve 180 degrees or 360 panoramic picture, and through the embedded or external image processing software to elliptical or circular deformed image corrected to a normal video image.

It can be said that the panoramic camera provides a very perfect technical basis for shooting. However, the panoramic camera must be solved in the work is not only a shooting angle problem. Instead, it is precisely because of the wide range of shooting angles, which has also brought new challenges to the operation of the panoramic camera that are rarely seen in conventional cameras.

1, the wide dynamic bondage In the work of the panoramic camera, a full range of shooting angles to solve the shooting difficulties in various locations. But for the wide dynamics or white balance, exposure, etc. that require special handling, these problems are much more complicated to process in a panoramic camera. Therefore, it is also based on these factors that the panoramic camera has to have better lighting requirements in the shooting environment at work. So, if we solve the problem of wide dynamics, the application of the panoramic camera will be upgraded to a whole level.

2. Resolution Compared to other types of surveillance cameras, the biggest advantage of panoramic surveillance is that it has a large range of compatibility. However, in the role of resolution, if you want to meet the high-quality display of the entire perspective is also really not an easy thing. From a technical point of view, when the monitoring range expands, it takes multiple times of image information to share the same size of an imaging chip with a conventional monitoring lens, which results in a decrease in the screen resolution, and therefore the same pixel will appear. The camera will cause pixel dispersion and degradation when monitoring a larger area. Intuitively, it is difficult for a pixel monitoring device to achieve the same image clarity of an ordinary surveillance camera.

Therefore, this has caused many panoramic surveillance cameras to be used only when the image quality requirements are not so high or high-resolution imaging devices are used.

3. Difficult to popularize low illumination For a long time, low illumination is the main technical support for surveillance cameras in applications, and it is also a technology aspect that many surveillance cameras are proud of. In particular, with the ever-increasing monitoring needs, everyone is increasingly looking for low-light applications. However, it is also subject to the constraints of the angle, and the low illumination in the panorama camera is also easily compromised.

In today's common night-vision surveillance cameras, ICR filter chips are basically used to solve low-light technical problems. However, subject to the visual layout of the panoramic surveillance cameras, many panoramic cameras cannot fully utilize the ICR for night vision functions. Therefore, this results in the poor visibility of the night vision of many panoramic surveillance cameras. Therefore, if the picture is difficult in the night vision demand, the panoramic camera obviously needs to explore a new path.

In fact, for the above-mentioned problems, the lens-type is better than the fish-eye lens. However, for the impact of cost and blind area, to a certain extent, the application of sub-camera panoramic monitoring is also full of many preconditions. Therefore, it also makes many users who are full of panoramic monitoring hearts filled with entanglement.

The panoramic camera is generally a high-definition camera, people have higher expectations for their image quality. However, due to the short focal length of the fish-eye panoramic camera lens, the effective monitoring range is greatly limited, and the human face can be seen within a radius of 5 meters, and if it is farther away, it will become unclear. In other words, although the panoramic camera satisfies the need of “no dead angle monitoring”, due to the problem of lens focal length, it is difficult to meet the need to “see all details”, which is a bottleneck encountered in the promotion of the panoramic camera. The high-speed dome camera has a large zoom, rotatable function, and does a very good job in monitoring the details of presentation, but the single dome camera is still not convenient and fast in terms of quick positioning and judgment of orientation.

It is an “excellent” method to combine a fisheye panorama with a high-speed ball through a combination of hardware and software. On the basis that the panoramic camera can realize large scenes and large visual field monitoring, the high-speed ball enhances the ability of detail monitoring. It is like the higher level unit grasps the events detected in the entire screen, and the fast ball is like subordinates, receiving After the instruction issued by the superior, the target can be zoomed to a resolution of 1080P or more by tracking and monitoring the suspicious target and through the high zoom lens. Users can use the fast dome camera to capture high-quality images in key areas while monitoring the entire environment through fisheye cameras. We have reason to believe that "marriage" with high-speed balls will be one of the fates of the fisheye panorama.