A lot affect the signal that comes to the DVR or any other recording device, the cameras themselves. Or rather their matrix, pixel resolution and possibilities. Some cameras have the possibility of automatically reducing, increasing and other image optimization for further recording. In some cases, this can significantly help, since the picture is clear regardless of the distance of the shooting. And some cameras allow you to remove only a static image that has high resolution and shooting quality, but the tracking object is removed from only one point. Such cameras can be controlled remotely, if they have the necessary built -in module in the design, they can be tuned in advance by hand.