Fully popularize wide dynamic camera knowledge

Wide dynamic cameras account for a growing share of market share, thanks to the rapid development of today's era. For wide dynamic cameras, many of our friends are not particularly clear about understanding. Today, we will follow the pace of Xiaobian, let us all bathe in detailed knowledge explanations, and have a clearer understanding of wide dynamic cameras.

Wide dynamic cameras mainly use "dynamic range". In the broad sense, "dynamic range" refers to the span that a changed thing may change, that is, the area between the lowest pole and the highest pole of the change value. The description is generally the difference between the highest point and the lowest point. This is a very widely used concept. When talking about the image indicators of a camera product, the general "dynamic range" refers to the ability of the camera to adapt to the illumination of the scene in the scene, specifically the brightness (contrast) and color temperature (contrast). The scope of the change. When a high-luminance area illuminated by a strong light source (daylight, luminaire, or reflective) and a relatively low-intensity area such as a shadow, a monitor-mounted backlight, or the like are present in the image simultaneously, the image output from the camera may appear bright due to overexposure. White, while the dark areas become black due to underexposure, which seriously affects image quality. The camera's performance in the brightest and darker regions in the same scene is limited. This limitation is commonly referred to as the "dynamic range."

In modern life, modern transportation requires modern traffic management. It is necessary to solve the traffic congestion and congestion of major urban sections and intersections, reduce accidents and violations, and establish a modern intelligent traffic command and control system. At the same time, it is also of great significance for improving the image of the city and promoting the civilization and development of the city. The overall goal of the system design is to use road monitoring to implement traffic flow and traffic operation monitoring, real-time traffic control on key road sections, timely detection of various anomalies and emergency measures to ensure high-speed, safe and efficient operation of the road and improve modern life. Traffic level. According to the actual needs of traffic monitoring, wide dynamic cameras are generally installed at key points such as traffic intersections, stations, commercial areas, and highway toll gates. Generally speaking, wide dynamic cameras are more than traditional cameras with only 3:1 dynamic range. Dozens of times. Natural light is arranged from 120,000 Lux to 0.00035 Lux at Starlight Night. When the camera looks out of the window from the inside, the indoor illumination is 100 Lux, and the illumination of the outside scenery may be 10,000 Lux, compared to 10,000/100 = 100:1. This contrast makes it easy for the human eye to see because the human eye can handle a contrast ratio of 1000:1. However, it is a big problem to deal with it with a traditional closed-circuit surveillance camera. The traditional camera has only 3:1 contrast performance. It can only choose to use the 1/60 second electronic shutter to get the correct exposure of the indoor target, but the outdoor image. It will be cleared (all white); or alternatively, the camera will select 1/6000 seconds to get the perfect exposure for the outdoor image, but the indoor image will be cleared (all black). This is a long-standing flaw since the camera was invented.

Through the above understanding, we know that in terms of transportation, the use of wide dynamics is very extensive, which has a lot to do with its performance. I hope the above content will help everyone and truly understand the knowledge of wide dynamic cameras.