Precautions for purchase of HD surveillance front end

1. HD network camera or HD video server

The high-definition network camera is an integrated structure, the product is simple, and it is very convenient to apply. It is currently the subject of application.

High-definition video servers are used to connect high-definition cameras. It is also a good choice when the current high-definition network devices are not very rich, leaving more options for high-definition cameras.

2. CCD or CMOS

Currently, the camera components of high-definition network cameras generally use CMOS or CCD.

CMOS occupies a large proportion in high-definition monitoring due to its extremely high cost performance. CMOS technology is mature, can provide higher-resolution images, leaving a lot of room for the development of network cameras. In terms of application, CMOS also has inherent shortcomings, and its ability to adapt to low illumination is poor. But this will not affect its main force to become high-definition cameras.

CCD high-definition camera can adapt to the low-light environment, and the motion characteristics of the image are also good. As a megapixel network camera, it is a good choice, but the price is generally high. Therefore, the economics of use scenarios and systems should be considered in the selection.

3. H.264 or MPEG4

The improvement of image clarity imposes higher requirements on image processing and transmission. Both MPEG4 and H.264 encoding technologies are used in the current high-definition front-end. The technology is quite mature. The compressed image requires slightly higher bandwidth than the latter, but there are certain differences in product prices. In the application, it is necessary to examine the scale of the system and the network environment, and you can make a choice based on comprehensive economic factors.

4. Front-end storage

The occasions of high-definition monitoring are often more important occasions, which require higher image security, especially to prevent the impact of accidental failures from the network. It is a good measure to have storage on the front end. The image is compressed and encoded on the front end and stored on the local storage medium. Regardless of changes in the network environment, it can effectively ensure the storage safety of the image. But most high-definition front-ends do not have a built-in hard disk, but use a memory card as a medium. Improper measures may cause the media to be scrapped early, and collaboration with the back-end is required.