First, what is a fisheye camera
The fisheye camera is a camera with a fisheye lens. The fisheye lens is a super wide-angle special lens. Its structure is modeled after fisheye, and it can independently realize a wide range of cameras without dead angle monitoring. We know that fish eyes are similar in structure to human eyes, but the crystals of the fish are spherical and the human eye is oblate. Although the fish can only see objects closer, they have a wider perspective and even the angle of view. Up to 180°; fisheye cameras with the same characteristics are mounted by ceiling, with a visible range of 360° and can monitor all objects in a wide range of scenes, so they are also called panoramic cameras.
Figure 1 Fisheye 
Figure 2 fisheye lens
Second, the fisheye camera technology is difficult
Severe optical distortion: Fisheye cameras are super wide-angle, enabling comprehensive monitoring of a wide range of scenes with a small number of devices. However, the relatively large viewing angle brings more serious optical distortion (the picture is even round), and the image distortion is more serious. After the device needs to correct the original image, the effect will be accepted by the user.
Insufficient detail: large scene monitoring and small focal length and depth of field make the fisheye camera not very clear about the distant scene. To do this, engineers need high-resolution sensors to ensure that the target object has more pixels to represent; while improving the performance of the fisheye lens as much as possible, providing a better depth of field than conventional cameras to enhance the clarity of objects farther away. degree.
Figure 3 Fisheye lens imaging
Third, Hikvision product introduction
Fisheye cameras are generally divided into ordinary guns + fisheye lenses and integrated hemispherical fisheye cameras. Hikvision has independently developed a 12 million hemispherical fisheye camera DS-2CD63C2F-IVS. The device can output real-time images of 3072 X 3072 resolution, IP66 structure, the main technical parameters are as follows:
Figure 4 DS-2CD63C2F-IVS 12 Megapixel Fisheye Camera
Ø Support digital wide dynamic, 3D digital noise reduction
Ø High-efficiency infrared lamp, long service life, 360-degree all-round fill light, illumination distance up to 15 meters
Ø Supports up to 128G Micro SD/SDHC/SDXC card local storage
Ø ICR infrared filter type automatic switching for real day and night monitoring
Ø Built-in microphone and speaker, support two-way voice
Ø Ultra-wide-angle lens for 360° viewing, no blind zone monitoring
Ø Support hardware to correct panoramic or partial images. After correction, the video stream can be directly output for preview or video recording.
Ø Support for correcting panoramic or partial images, supporting three output modes
Ø Support cross-border detection, regional intrusion detection, support alarm linkage ball machine
Ø Support output fisheye heat map
Ø Maximum support for 20 simultaneous access
Ø With a variety of white balance modes, suitable for various scenes
Ø Support backlight compensation, automatic electronic shutter function, adapt to different monitoring environments
Ø IP66, anti-riot: anti-riot level supports IK10
The above parameters have created the unique characteristics of Hikvision's 12 million hemisphere fisheye camera products, as follows:
Two-way intercom: The built-in microphone and speaker can realize two-way voice intercom without external equipment.
Infrared fill light: With three high-efficiency infrared lamps, each lamp is responsible for 120° fill light, achieving 360° all-round infrared fill light.
Output after hardware correction: The traditional fisheye equipment stores the video as the original distortion image. When viewing the video, you need to use the special decoder or related software to correct the video before viewing. The DS-2CD63C2F-IVS fisheye camera can correct the original image. After outputting the data, the user can plan multiple channels and make independent output of the corresponding monitoring area. The stored and transmitted data is the corrected image; thus the user can selectively view the corresponding channel according to the need, without obtaining all the original images, saving Communication bandwidth and storage space.
As shown in Fig. 5, the upper right corner is the original image, and the user can select three areas on the image as independent monitoring areas, and the fisheye device will correct the image distortion and output image data separately; the user can selectively obtain Preview and store images in any specified area.
Figure 5 Fisheye correction example
Rich intelligent functions: DS-2CD63C2F-IVS has intelligent detection functions such as cross-border detection and regional intrusion, and also has a scene heat map display. In this mode, the device can analyze, count, and report on the flow of people in the scene. It is convenient for users to analyze the hottest areas in the scene, and can be applied to shopping malls, supermarkets, museums, counters and other scenes.
In addition, the device can also be linked with the intelligent high-definition network dome camera to achieve "point" and "face" monitoring. “Face†refers to the large picture taken by the panoramic camera. “Point†refers to the detail of the high-speed ball to the large panoramic picture. At the same time, the dome machine can automatically track multiple targets in the panoramic picture, thus achieving “no blind zone, no dead zoneâ€. Uninterrupted monitoring of orientation. As shown in FIG. 6 , when the target pedestrian triggers the detection line, the ball automatically tracks the trigger area to track the target object until the target moves out of the monitoring area to achieve multi-target alarm rotation tracking.
Figure 6 Fisheye-ball machine linkage detection
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