## 5 Recommended Configuration of Parameters with a High Failure Rate
### Recommendation of Parameter Configuration of Video Surveillance Equipment  
The slight and general failure performance analysis and parameter recommendations of all kinds of cameras for video surveillance equipment in the operating environment are as follows. Under high temperatures, the lens of the toll plaza camera may be deformed due to thermal expansion and contraction, which will accelerate the degradation process of the internal electronic components, lead to image distortion, and then reduce its imaging quality and stability. Therefore, this kind of camera should have good high-temperature resistance. In northern Xinjiang, the low temperature in winter has a significant impact on the equipment. If moisture is inside the camera shield, the icing phenomenon may damage the equipment. In addition, the electronic components inside the equipment may be unstable at low temperatures, resulting in a decline in the performance of the equipment and maybe even causing difficulties in starting or sudden shutdown. Based on this, it is recommended that the working temperature and humidity supported by the camera be between \(-40\)\({}^{\circ}\)C and \(70\)\({}^{\circ}\)C, and there should be no condensation when the humidity is less than 95%. Windblown sand particles in Xinjiang may be attached to the surface of the HD camera lens, resulting in visual field obstruction, which will reduce the image's resolution. At the same time, the wind sand may also cause wear and tear on the coating and lens, affecting its optical performance. Therefore, it is recommended that \begin{table}
\begin{tabular}{c l} \hline
**Related Parameters** & **Chinese National Standard: GB/T 36480\(-\)2018; GB/T 15412-2017** \\ \hline Visual resolution & 1. Products with a total number of nominal pixels less than 20 million pixels should not be less than 65\% of the theoretical limit resolution; 2.Products with a total number of nominal pixels greater than or equal to 20 million pixels should not be less than 60\% of the theoretical limit resolution. \\ \hline Operating temperature range & \(-10\)\({}^{\circ}\)C\(-\)55 \({}^{\circ}\)C \\ \hline Working humidity range & 30–85\% \\ \hline Geometric distortion & 1. For products with more than 2 million nominal total pixels, the absolute value of pillow or barrel geometric distortion around the captured image is less than 3\%; 2. The difference between the absolute value and the nominal value of geometric distortion is less than 5\%. \\ \hline Reliability parameters & 1. After working continuously for 1000 h, the illuminance value of the lighting device should not be less than 90\% of the initial illumination value; 2. The average time between failures (MTBF) of the head should not be less than 5000 h. \\ \hline Head rotation angle & 1. If the product stipulates that the horizontal (or vertical) rotation angle of the head is less than 360\({}^{\circ}\), then under the condition of GB/T 15412.5.5.1, first rotate the head left (upward) to the limit position in the horizontal (or vertical) direction, and take this position as the starting point, and then rotate the head in the opposite direction to the limit position, and take this position as the terminating end, and the rotation angle between the starting end and the ending end is the rotation angle range. 2. If the product stipulates that the horizontal (or re-straightening) rotation angle of the head is greater than 360\({}^{\circ}\), then under the condition of GB/T 15412.5.5.1, take a rest position of the head as the starting point, and then rotate the head horizontally (or vertically). If the head rotates to 360\({}^{\circ}\), it can still return to the beginning; that is, the rotation angle range of the head is 360\({}^{\circ}\). \\ \hline \end{tabular}
\end{table} 
Table 6: _Cont._the protection level of the outdoor camera is not lower than that of IP66. According to the above general specifications for outdoor cameras, the main technical parameters of cameras in different locations can be obtained.