There are two types of image sensors used in cameras, namely CCD (charged coupled device) and CMOS (complimentary metal oxide semi-conductor). Type image sensor in a reverse camera you use will be an important factor in determining image quality.
In addition to the overall resolution, a camera that uses a CCD image sensor can provide a significantly better under conditions of very low light or very bright.
All products, except the cheapest digital photos and videos, are already utilizing the CCD image sensor. All photos and professional video equipment utilizing the CCD image sensor.
Although there are some pictures CMOS image quality is high enough, no CMOS image sensors that provide equivalent image quality results given by the CCD image sensor.
Many reverse camera system that cost less and some more valuable still quite expensive which uses a CMOS image sensor.
If you are given a choice, you should choose a rear view camera system that uses high-quality CCD image sensor of well-known manufacturers and choose the type of reverse camera which is suitable for use in your car.