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Shenzhen Changhong Microelectronics Co.,Ltd

How To Choose Starlight camera

Starlight camera types: dome camera, gun camera, waterproof integrated machine, anti-riot dome camera.


A star-level camera is a camera that can display a clear color image without any auxiliary light source in the case of low light, usually in a starlight environment. It is different from an ordinary camera and can only display black and white images. This is a favorite star-level camera for engineers. One of the main reasons is that cameras capable of color imaging at night can greatly improve the monitoring effect. At the same time, the Starlight class uses ultra-sensitive image sensors and unique electronic multiplier and noise control technology to greatly improve the sensitivity of the camera, and has 24-hour full-color real-time effects, no smearing of ordinary low-light cameras, Meet the demand for high-quality monitoring at night, and the power consumption is small, the image effect is real, and it is not color cast. According to the definition of standardization, when the illumination range reaches and exceeds 0.0001 Lux, the "star-level" ultra-low illumination camera is reached.

There are three factors that affect the starlight camera.

The first is the choice of sensor. It is well known that for an image sensor of the same photosensitive area, the higher the pixel, the smaller the photosensitive area allocated to each pixel, the smaller the amount of light passing through an exposure period, and the worse the low illumination effect. For example, all 1/3-inch sensors, ordinary analog cameras are about 300,000 pixels, while high-definition cameras are at least 2 million pixels, the pixel points are 8 times that of analog cameras, and the photosensitive area of each pixel is only analog cameras. 1/8, if you do not use high-tech sensors, its high-definition picture quality will be terrible at night.

Followed by the adjustment of the ISP. It is often possible to find the same solution and the same sensor when PK is used in various effects on the market, but the low-light effect of each manufacturer is quite different. In the ISP processing of low-light effect imaging, noise reduction processing and gamma curve adjustment are important image processing processes. Noise will make the image appear unclear, but improper noise reduction will cause serious fog and smear. Loss of details and other phenomena. If the gamma curve value is set too high, the contrast of the picture will increase, the picture will be darker, the picture quality will be transparent, but the details will be lost; if the gamma curve value is set too low, the image will be brighter and the details will increase, but the picture will be drawn. The quality permeability is deteriorated. Therefore, even if based on the same hardware platform, the final effect of the product is different, which reflects the research and development capabilities of different manufacturers.

Finally, the influence of the lens, the maximum aperture value of the lens is one of the most important factors. The larger the aperture is, the larger the amount of light is, and the better the color effect is. Otherwise, the worse the effect is, but the larger the lens aperture is, the shallower the depth of field is, that is, the smaller the range of sharp focus in the scene, so the lens aperture value needs to be based on the actual scene. Adjustment, can not increase the aperture for the amount of light. Another parameter similar to this is the slow shutter speed of the camera. When the shutter is slower, the amount of light entering is higher, the brightness of the picture is increased, but the smear of the relative moving object is more serious, so the shutter value is also a double-edged sword. Set the corresponding value for the application scenario.

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