How do we interpret the differences between megapixel and HD cameras?
HD cameras can be classified as a sub-group of Megapixel cameras. The HD cameras capture video with the aspect ratio of 16:9 and the standard resolution of 720p, 1280i or 1280p. And these HD cameras usually can record video in frame rate of 15fps, 25fps or even higher. It can ensure the real-time video recording. However, megapixel camera does not have certain standard aspect ratio. The recording frame rate and resolution of different camera models can have a great difference. As the HD cameras capture 16 : 9 video, which cover 33% more area than traditional 4:3 aspect ratio under the same vertical view angle. Hence the HD cameras can provide a wider view to greatly reduce the blind spots in the surveillance system.
