The brightness and contrast needs to be roughly the same as ambient, otherwise having a bright rearview mirror would be a distraction. Getting the screen brightness right could be a problem when driving at night. (CRT screens with analog TV cameras that have no digital in the signal path are pretty much the only way to avoid this, which would be an absurdly bulky system.) An object moving at 60mph shown through a 30fps camera with a latency of 1 frame is 1m away from where it appears to be. Fine for slow moving parking cameras, maybe a problem at speed. It's the same with everything else, it takes years before new technology really reaches the rank and file.ĭigital camera systems with LCD screens impose latency of at least a frame on the images. Technology is there already, we only adapt slowly to the change. You even have active lane tracking already. Followed by acoustic warnings if you still try to change lanes up to point where the car brakes on side to put you back in your original lane. Collision detection features that check your dead angle and if it is unsafe to change lanes a little red triangle lights up in your side mirror. Mercedes Benz for example has some really nice safety features that use cameras already. Many people simply can't afford cars with expensive extras. Price point, conventional mirrors are pretty cheap and cars with cameras are not the basic configuration.Electronics can be manipulated, have a latency etc. The new systems have to match a mirror in terms of reliability and safety. Conventional mirrors are basically fail safe, imagine the camera system turning off on the motor way. State laws require mirrors and would have to change first.In summary the main reasons why we don't have it yet are There is an article that provides information about that. The industry is already going down that path for the exact reasons you mentioned. This is only tangentially relevant because backup cameras are for backing up but mirrors serve many other purposes. They could completely eliminate blind spots, even while allowing for radically different car shapes that might prove more aerodynamic or cheaper to manufacture.ĮTA: Backup cameras haven't stopped drivers from backing into stuff. They could improve night vision by shifting infra-red spectrum into the visible range. They could improve the aerodynamics of the car. They could completely eliminate the glare of headlights or a low sun while still preserving contrast. A camera and screen has a lag on the order of tens of milliseconds, which could conceivably make a difference in an emergency situation.Ĭamera and screens (with good processing) could give many advantages: A camera projects a single-viewpoint onto a screen giving a 2D projection.Ī mirror allows you to see more by slightly shifting your viewing position.Ī mirror has much better contrast, color, and resolution than any camera and screen combo.Ī mirror has effectively zero latency. There are many more failure modes.Ī mirror allows you to observe with binocular vision, preserving 3D clues, like parallax. (Though I have had a center rearview mirror fall once because the adhesive that held it to the windshield failed.) Camera and screens are more expensive, more complex, active devices. Pretty much the only failure mode is it breaking on impact. Does such technology exist? If it exists then why it is not widely used?Ī mirror is cheap, simple, passive technology that works.Why cameras (and obviously displays) are not used instead of mirrors?.Weight of the car will be reduced negligibly assuming electronic circuits will be lighter than mirrors. Since the mirrors will be replaced by cameras, it will reduce the wind resistance for car.Also it will save the hassle of monitoring both the mirrors while driving. in forward direction), I believe it will be helpful for the driver since multiple cameras installed on the rear side of the car will give consolidated view to the driver. If we use this technology while driving the car (i.e. I noticed such technology exists but it is restricted to only when you take the car in the reverse direction. These mirrors can be easily replaced by cameras and monitors (display for the driver). Despite having so much technological advancement, I wonder why cars still uses mirrors (right and left side of the driver) for the rear view.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |