HD and megapixels are so different in nature, unlike many of us who have understood before - the picture is clear and the concept of HD. The realization of HD is done by many aspects. Among them, there are several applications of technology that are undoubtedly the most important part of high-definition imaging. Below, we will discuss the realization of high-definition effects from four aspects: high-definition format, high-definition equipment, high-definition interface and high-definition video.
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HD format
Although the current high-definition technology has reached a high level, and with the support of digital technology, high-quality video transmission is no longer difficult. However, since HD video is still maintained at a high level of data transmission. Therefore, the requirements for the compression algorithm are also very high. In the current high-definition video formats, H.264, WMA-HD, MPEG2-TS, MPEG4, and VC-1 are all compression technologies we will encounter. Among these formats, H.264 technology is undoubtedly the most widely used technology. Due to the strong compression capability of H.264, and the loss of signal can be maintained at a very low level, compared with other compression technologies, the authenticity of imaging can be guaranteed. Therefore, the current high-definition compression technology mainly relies on the H.264 format.
HD interface
In the working process of the high-definition monitoring system, the main interface of the device is self-evident. Previous article on the development of security monitoring in various areas of the bottleneck "promising prospects but the road to bumpy monitoring development and encounter bottlenecks" has mentioned that in the current situation of the transmission line has been basically solved, many devices have become a barrier to HD Another bottleneck in network transmission. However, if the interface problem is not handled well, HD is basically difficult to implement, so the appropriate device interface is an important prerequisite for high definition.
HD devices and HD video
In current devices, the VGA interface, DVI interface, and HDMI interface are our most common interfaces. In comparison, DVI and VGA are the most commonly used interfaces in PC devices (of course, it does not mean they can not be applied to other interfaces), but compared to VGA, the advanced point of DVI is that it is a fully digital transmission. The interface, so it can better guarantee the uncompressed characteristics in the transmission, so that the image quality will be damaged to a minimum.
For the HDMI interface, its implementation is obviously much later than the previous two ports. Like the DVI interface, it is also a modern port with digital transmission. But more abundant than the DVI function, HDMI can also complete the transmission of audio signals while the video is being transmitted. However, compared with the previous characteristics of wired signal transmission, the HDMI port based on digital transmission can better avoid the interaction between audio and video, thus ensuring more stable audio and video transmission.
HD device
As we mentioned before, the definition of 1080p, 1080i and 720p for HD video standards is considered HD video imaging. However, for equipment, this standard has been upgraded to a higher requirement. From the perspective of monitoring equipment, it is currently believed that only the powerless resolution of the display reaches 1920×1080P, that is, the device with a horizontal resolution of 1920 pixels and a vertical resolution of 1080 scan lines can be called a high-definition device. This is the "Full HD" device we often mention. In the high-definition device configuration, high-quality video capture cards also play a decisive role in the performance of the device.
HD video
Compared to previous requirements for device performance, HD video is more a measure of the results of device work.
The high-definition video mentioned here refers to the full HD (up to 1930*1080p standard) video produced in the HD video format. The implementation of such video quality requires high processing power, advanced video compression format, and more professional video capture and transmission tools. Overall, it is the result of a comprehensive HD technology support. Only in this way can we ensure the clarity and high quality of video imaging and achieve true full HD effect.
Through the above description, I believe that everyone has a more comprehensive understanding of HD. I hope this article can help everyone better identify high-definition products on the market and better protect their rights and interests.
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