Camera Horizon of Car Rearview System
Camera horizon also refers to the camera to reflect the range, or you can say the field of view. There are three elements of the camera horizon in the Industry, namely the distance from the driver's eyes to the rear-view camera; rearview camera size and radius of curvature of the rear-view camera. There is a certain relationship between the three elements, when the car rear view system distance is the same with its size, the smaller the radius of curvature of the camera, the greater the camera reflects the horizon. When the radius of curvature of the camera is the same, the larger the size of the camera, the camera reflects the horizon is greater. But things always have a dual nature, although the larger the field of view, the smaller the radius of curvature of the camera, but the camera reflects objects deformation degree. Industry standards, not be greater than 3% distortion rate of the plane camera, convex camera distortion rate must not be greater than 7%, the requirements do not reflect the crooked-kind images.
Car Rearview Camera Reflectance Index
Meanwhile, car rear view camera also has a reflectivity index. The greater the reflectivity, the clearer the camera reflects the image. The size of the reflectance has something to do with the camera surface reflection film material. The car rearview reflection film for general use of silver and aluminum as the material, they do small reflectance of 80%. High reflectivity in a number of occasions that there will be side effects, such as driving at night under the irradiation of the back car headlights, driving within the rearview camera reflection will produce glare, affecting traffic safety. Therefore, most people generally use the inside rearview camera prism camera. Inside rearview camera there are an automatic discoloration (Auto-Dimming), its electronic photosensitive detector can automatically distinguish impose external natural light the light source, within a few seconds to adjust the camera within the liquid crystal material by the current change, from colorless change to colored in order to adjust the reflectance of the inner rearview camera so as to resolve the glare problem.
Mounting Position of Car Rearview System
The distance from driver's eyes to the rear-view camera is the installation location of the rear-view camera, it has a direct impact on the event horizon of the rear-view camera, clarity and auto contour size, traffic safety is very important. Therefore, the rearview camera mounting position is required to achieve the requirements of industry standard horizon; rearview camera should be as close to the driver's eyes, should be easy for drivers to observe, head and eye movements as small as possible; rearview camera should be installed in the body up and down the position of the minimum vibration. The cars now, for example, the exterior camera is mainly installed on the front door, and the control mode has electric and manual.
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This article is come from:http://www.china-autosupplies.com/index.php/car-rearview-camera-structural-principle.htm
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