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Basic information Chinese name Car mounted camera function The function of presenting videos and audio effect Traffic accident handling provides a more scientific basis catalogue 1 Function 2 Performance 3 lenses 4 Working principle 5 Installation Requirements   function 1 . Provide reliable evidence for the analysis and judgment of traffic accidents 2 . Convenient for drivers and passengers to check the condition inside the car 3 . Provide a basis for handling disputes lost and found items, theft prevention and other issues among passengers in the vehicle 4 . Provide monitoring of the inside and outside environment of the carriage to ensure the safety of vehicle operation fold   performance What kind of car camera is good ? The performance of car mounted cameras can be evaluated from the following aspects 1 、 Chips CCD and CMOS chips are important components of the reverse camera which can be divided into CCD and CMOS according to their different components CMOS is mainly used in products with lower image quality Its advantages are lower manufacturing cost and power consumption compared to CCD but its disadvantage is that CMOS cameras have higher requirements for light sources CCD is a high - end technology component used in photography and videography which also comes with a video capture card CCD and CMOS have a significant difference in technology and performance Generally speaking CCD has better performance but it is also more expensive It is recommended to choose a CCD camera without considering the cost   2 、 Clarity Clarity is one of the important indicators for measuring cameras Generally speaking products with high clarity will have better image quality Products with a clarity of 420 lines have become the mainstream product for reverse cameras while products with a clarity of 380 lines can also be chosen if well tuned There are better chips such as 480 wire 600 wire 700 wire etc However depending on the chip level of each camera the level of photosensitive components including the level of debugging technicians products of the same chip and grade may present different quality effects It also depends on what kind of lens is used, and lenses made of good materials will have much better image presentation effects On the contrary High definition products will have some discounts on night vision effects   3 、 Night vision The night vision effect is related to the clarity of the product The higher the clarity the worse the night vision effect of the product This is because of the chip itself However, high - quality products have night vision function and do not produce image effects on objects Although the color may be slightly different clarity is not a problem If there is infrared night vision fill or LED white light fill night vision will be clearer and more visible   4 、 Waterproofing Most reverse camera products have waterproof function To sum up when choosing a reverse camera we should consider the above aspects and the most important thing is to see and compare the actual effect of the image   5 、 Dedicated reversing camera for special vehicles Many cars have already produced specialized reverse cameras that can be used with over 500 models When choosing be sure to first choose your own model specific reverse camera If not then choose a universal reverse camera   6 、 Universal camera General purpose cameras include 18.5mm perforated cameras small butterfly external cameras license plate frame cameras 28mm perforated cameras bus cameras and other external cameras such as LED night vision color external cameras for car navigators   lens The lens of the car mounted camera is the core component and the four key parameters are as follows Folding focal length The size of the focal length determines the size of the field of view angle When the focal length value is small the field of view angle is large and the observed range is also large but the resolution of distant objects is not very clear The focal length value is large the field of view angle is small and the observation range is small As long as the focal length is selected appropriately even distant objects can be seen clearly Due to the one - to - one correspondence between focal length and field of view angle a determined focal length means a determined field of view angle Therefore when selecting a lens focal length it is important to fully consider whether the observation details are important or whether a large observation range is important If you want to see details choose a long focal length lens If you are watching close - up scenes choose a wide - angle lens with a small focal length   Folding aperture coefficient   The light flux represented by F is measured by the ratio of the lens focal length f to the aperture D Each lens is labeled with a maximum F value for example 6mm / F1 . 4 represents a maximum aperture of 4 . 29 millimeters The luminous flux is inversely proportional to the square of the F - value and the smaller the F - value the greater the luminous flux The scale values of the aperture index sequence on the lens are 1.4 2 2.8 4 5.6 8 11 16 22 etc The pattern is that the exposure amount at the previous scale value is exactly twice that of the corresponding exposure amount at the latter scale value That is to say the aperture of the lens is 1 / 1.4 1 / 2 1 / 2.8 1 / 4 1 / 5.6 1 / 8 1 / 11 1 / 16 1 / 22 respectively The former value is twice the root of the latter value Therefore the smaller the aperture index the larger the aperture and the greater the illumination on the imaging target surface In addition the aperture of the lens can be divided into manual IRIS and automatic IRIS When used in conjunction with a camera manual aperture is suitable for situations where there is not much change in brightness Its light intake is adjusted through the aperture ring on the lens until it is suitable in one go The automatic aperture lens will automatically adjust according to the changes in light and is used in outdoor entrance and other places with large and frequent light changes   Auto iris lens Automatic aperture lenses are divided into two categories : one is called video (VIDEO) drive type and the lens itself contains an amplifier circuit to convert the video amplitude signal transmitted by the camera into control of the aperture motor Another type is called DC drive type which uses the DC voltage on the camera to directly control the aperture This type of lens only includes an ammeter type aperture motor and requires an amplifier circuit inside the camera For various types of automatic aperture lenses there are usually two adjustable knobs One is the ALC adjustment (metering adjustment) which has two options peak metering and average metering based on target lighting conditions Generally the average metering level is taken Another is LEVEL adjustment (sensitivity) which can make the output image bright or dim   Folding zoom lens There are two types of zoom lenses : manual zoom lenses and electric zoom lenses Manual zoom lenses are generally used for scientific research projects rather than in closed - loop monitoring systems When monitoring large scenes the camera usually needs to be used in conjunction with an electric lens and pan tilt The advantage of an electric lens is that it has a large zoom range which allows for viewing a wide range of situations and focusing on certain details In addition the pan tilt can rotate up down left and right resulting in a very large viewing range Electric lenses have multiple magnifications such as 6x 10x 15x 20x etc If you know the reference focal length you can determine the variable range of the lens focal length For example a 6x electric lens with a reference focal length of 8 . 5 millimeters would have a continuously adjustable zoom range of 8.5 to 51 millimeters and a field of view angle of 31.3 to 5.5 degrees The control voltage of electric lenses is generally 8V ~ 16V DC with a maximum current of 30mA So when selecting a controller it is important to fully consider the length of the transmission cable If the distance is too far the voltage drop generated by the line will cause the lens to be uncontrollable Therefore it is necessary to increase the input control voltage or replace the video matrix host with a decoder for control In addition to the above four items there are certainly other minor knowledge but mastering these four indicator coefficients can be suitable for the configuration and application of the lens   operational principle The camera power is connected to the reverse taillights When reverse gear is engaged the camera synchronizes power supply and enters the working state The collected video information is sent to the wireless receiver located at the front of the car through the wireless transmitter The receiver transmits the video information to the GPS navigator through the AV IN interface This way when the receiver receives the signal regardless of whether the Gps navigator is in any operating interface We will prioritize providing LCD screens for reverse image videos   The difference between the use of car mounted cameras car mounted displays and car mounted DVD navigation systems as well as portable GPS navigation systems is that when using car mounted displays the car mounted displays do not need to be turned on As long as reverse gear is engaged the car mounted displays will automatically display the image of the car mounted camera The car DVD navigation can only display the car camera image under normal startup conditions When using a portable GPS navigation system it is necessary to turn on the navigation system before displaying the car camera image   5 . Because the industry of in car cameras has just started customers initially did not have high requirements for this color and the price of color is also relatively expensive However with the development of technology color cameras will also become more and more widespread   6 . The installation cost of a bus mainly includes the following aspects : host cost camera cost hard drive cable installation cost The price of different host equipment varies and the price of different camera quantities also varies The host price in the market itself varies greatly  

Installation requirements for on-board cameras system requirements The implementation of urban public transportation vehicle monitoring system requires the following system requirements: 1. Real time monitoring: Monitor the driving situation of public transportation vehicles and record the inside and outside of the vehicle. 2. Safety protection: When a bus accident occurs, the system automatically records relevant information and proactively alarms in case of an emergency. 3. Data analysis: Quickly analyze the driving trajectory and behavior of vehicles to improve driving efficiency. system implementation The following are the specific implementation steps for the urban public transportation vehicle monitoring system: 4. Install the camera Installing cameras is the first step in urban bus monitoring systems, and the location of the camera installation is also an important factor affecting the monitoring effect. Generally speaking, the camera should be installed on the top of the carriage to cover the entire carriage and capture data such as vehicle speed, acceleration, and acceleration changes. At the same time, it is necessary to build the overall framework of the camera to prevent it from loosening during road driving, thereby affecting the transmission of vehicle monitoring signals. 2. Hardware connection After constructing the urban bus monitoring system, it is necessary to establish a platform for data collection and storage. Hardware connections include cables, servers, sensors, cameras, analysis software, and displays. These devices often require the use of multiple different interfaces, and the corresponding data transmission also relies on different transmission protocols. Therefore, it is necessary to ensure that all devices can effectively connect to the central server in order to save data in a timely and effective manner. 3. Software development Software development is one of the most crucial parts of the construction of urban bus monitoring systems. In order to ensure the normal operation of the vehicle monitoring system, it is necessary to develop software applications according to specific functional requirements. Among them, real-time data collection applications can collect data on vehicle location, speed, temperature, and internal safety conditions of the carriage. Data encryption applications can encrypt and transmit sensitive information to prevent information leakage. 4. Data processing Due to the large number of urban public transportation vehicles, it is necessary to process and integrate the collected data. We can use data analysis tools to analyze the collected data, in order to quickly identify abnormal situations or vehicle malfunctions. However, attention should be paid to the issue of vehicle information sharing. It is not allowed to disclose the driving information of vehicles to the public, and it is necessary to fully protect the operating information of vehicles. 5. Information release Finally, for the public, being able to timely understand the real-time location of vehicles means that passengers can take public transportation more conveniently. Therefore, we can set up "real-time vehicle operation monitoring" screens or use vehicle operation software at stations or public places, so that passengers can obtain real-time bus information. summary The construction of urban bus monitoring systems can greatly improve the safety and coordination of bus operations. By analyzing and integrating system data, abnormal situations can be quickly identified, and vehicle information can be analyzed to improve vehicle driving efficiency. Of course, in the implementation process of building an urban public transportation vehicle monitoring system, it is necessary to implement and develop the above plans according to specific needs and conditions