Caméra montée sur voiture

Informations de base
Nom chinois
Caméra montée sur voiture
fonction
La fonction de présentation de vidéos et d'audio
effet
La gestion des accidents de la route fournit une base plus scientifique
Catalogue
1 Fonction
2 Résultats
3 lentilles
4 Principe de fonctionnement
5 Exigences relatives à l'installation

fonction
1. Fournir des preuves fiables pour l'analyse et le jugement des accidents de la route
2. Convient pour les conducteurs et les passagers de vérifier l' état à l' intérieur de la voiture
3) Fournir une base pour traiter les litiges liés aux objets perdus et trouvés, la prévention du vol et d'autres questions entre les passagers dans le véhicule
4. Assurer la surveillance de l'environnement intérieur et extérieur du transport pour assurer la sécurité de l'exploitation du véhicule
déplier

performances
Quel type de caméra de voiture est bon? Les performances des caméras montées sur une voiture peuvent être évaluées à partir des aspects suivants
1 、 Fiches
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 、 Clarté
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, et les lentilles faites de bons matériaux auront des effets de présentation d' image bien meilleurs au contraire Les produits haute définition auront des réductions sur les effets de vision nocturne

3 、 Vision nocturne
L'effet de vision nocturne est lié à la clarté du produit Plus la clarté est élevée, pire est l'effet de vision nocturne du produit. 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 、 Imperméabilisation
La plupart des produits de caméra à l'envers ont une fonction imperméable
Pour résumer lors du choix d'une caméra arrière nous devrions considérer les aspects ci-dessus et le plus important est de voir et de comparer l'effet réel de l'image

5 、 Caméra dédiée à l'arrière pour véhicules spéciaux
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 、 appareil photo universel
Les caméras à usage général comprennent 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

lentille
L'objectif de la caméra montée sur la voiture est le composant principal et les quatre paramètres clés sont les suivants
Distance focale pliable
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

Coefficient d'ouverture de pliage

Le flux lumineux représenté par F est mesuré par le rapport de la distance focale de la lentille f à l' ouverture D Chaque lentille est marquée par une valeur F maximale, par exemple 6 mm / F1.4 représente une ouverture maximale de 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. Je vous en prie.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

Lentille d' iris automatique
Les lentilles à ouverture automatique sont divisées en deux catégories:  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

Objectif zoom pliable
Il existe deux types de zooms:  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 millimètres auraient une plage de zoom réglable en continu de 8,5 à 51 millimètres et un angle de champ de vision de 31,3 à 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
En plus des quatre points ci-dessus, il y a certainement d'autres connaissances mineures, mais la maîtrise de ces quatre coefficients d'indicateur peut être adapté pour la configuration et l'application de la lentille

principe de fonctionnement
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

C' est cinq.  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. Le coût d' installation d' un bus comprend principalement les aspects suivants:  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