What do you mean by the high-definition network surveillance camera specification of 4mm?

"4 mm refers to the specifications of the lens, and the range and distance of the picture that can be seen by lenses with different mm numbers are different. ?” 4MM and 6MM in the parameters refer to the lens focal length of the camera. General camera lens specifications are 4mm, 6mm, 8mm, 16mm, 25mm, etc.

Introduction:

The high-definition megapixel network camera is a professional video surveillance camera introduced by the security industry and applied to the monitoring field. MPEG4-4 coding algorithm is usually adopted, and standard h.264 algorithm is adopted for high-end video. The video resolution reaches 72P(128* 72) or 18P(192*18).

a megapixel network camera based on the standard H.264 Main Profile algorithm generally adopts a 5 megapixel progressive scanning image sensor, which supports high-definition analog output, and the resolution can reach the broadcast image quality of 72TVL. Due to the standard H.264 compression, video files can be decoded by standard decoder, which supports direct playback by common playback software.

at the same bit rate, the image quality is twice that of MPEG-4, and at the same picture quality, the bit rate is only half that of MPEG-4. Because the high-definition megapixel network camera not only has high definition, but also is easy to operate and install, it can greatly reduce the cost of engineering wiring and construction, and make your CCTV network extend indefinitely.