Advantages and Disadvantages of Half HD Camera Applications Analysis
2023-06-14 07:17:05
In recent years, with the increasing demand for security surveillance cameras, the security monitoring industry has developed rapidly. The application of surveillance cameras has evolved from individual industries to the needs of the mass market, from local monitoring to remote monitoring across regions and across provinces, from analog surveillance cameras to IP surveillance cameras with multiple advantages. With the constant pursuit of image clarity, high-definition surveillance has gradually become the industry's development trend.
High-definition monitoring advantages
For surveillance cameras, image clarity is undoubtedly the most critical technical indicator. The clearer the image, the more obvious the details and the better the recognition effect. Its advantages mainly include the following points:
Get more video information by providing high resolution images
High-definition cameras can generally achieve resolutions of 1280x960, 1920x1080, 2048x1536 or even 2560x1920. Under the same environment, HD can provide clear and detailed images, which can better capture details and make the target clear and identifiable.
More video coverage
A megapixel network camera can replace the original 2 or 3 standard definition cameras or even more with the same monitoring coverage area. For wide viewing angles and large-scale surveillance-intensive locations such as airports, transportation, bayonet, banks, and perimeters, only a small number of megapixel network cameras can be deployed to achieve the previous results.
Supports higher frame rates and high image fluency
Both 720p and 1080i/1080p can support 60 frames per second, and its image fluency is double that of standard definition. Support large-screen display, 16:9 widescreen display, can greatly enhance the user's viewing experience.
High-definition picture quality provides favorable conditions for intelligent monitoring
HD surveillance can provide more content, more detailed high-definition picture, thus creating conditions for intelligent monitoring applications.
Analysis of Problems in HD Monitoring Application
HD network cameras have made a qualitative leap in image clarity, but they have also brought a series of real problems to high-definition surveillance systems. The three core issues to be solved by HD monitoring are: bandwidth issues, display problems, and storage problems.
Bandwidth issues
Due to the current limited network bandwidth, the high bit rate brought by high-definition video has become its biggest promotion bottleneck. How to transmit as high quality video as possible with the lowest possible bit rate is the top issue that HD surveillance needs to solve. At the same time, due to the heterogeneity of the network, different networks have different channel characteristics. Different users enjoy different network bandwidths. Even the bandwidth of the same user may change at any time. With the development of the monitoring field, various user terminals have the need to connect to monitoring video. For example, the network bandwidth of the local area network monitoring network is ideal, and users want to browse high-quality video. However, due to the limited bandwidth in the field of mobile phone monitoring, users value the low code. Rate video fluency. How to adapt to these different bandwidth environments is also a problem that HD surveillance devices need to solve.
Display problem
Compared with standard definition video, the amount of high-definition video information is abundant, and the corresponding performance requirements for decoding and display are also greatly improved. For example, currently mainstream PCs can easily achieve 8-channel D1 standard definition video decoding display, but if the front end is 1080P HD video , can barely decode and display 1 way.
For large surveillance camera platforms, if all HD video is used, server decoding pressure will be great.
Storage problem
The increase in image resolution will inevitably consume more storage space. Using H264 encoding algorithm, in order to ensure clarity, the code stream needs to be maintained at 6Mbps or more, which is about 4-8 times of standard definition video. Under standard definition video conditions, a 16-channel DVR built-in 8 fast 2T hard disk can meet the long-term video storage requirements. In high-definition monitoring, this time will be greatly shortened, which will bring about increased storage costs.
High-definition monitoring advantages
For surveillance cameras, image clarity is undoubtedly the most critical technical indicator. The clearer the image, the more obvious the details and the better the recognition effect. Its advantages mainly include the following points:
Get more video information by providing high resolution images
High-definition cameras can generally achieve resolutions of 1280x960, 1920x1080, 2048x1536 or even 2560x1920. Under the same environment, HD can provide clear and detailed images, which can better capture details and make the target clear and identifiable.
More video coverage
A megapixel network camera can replace the original 2 or 3 standard definition cameras or even more with the same monitoring coverage area. For wide viewing angles and large-scale surveillance-intensive locations such as airports, transportation, bayonet, banks, and perimeters, only a small number of megapixel network cameras can be deployed to achieve the previous results.
Supports higher frame rates and high image fluency
Both 720p and 1080i/1080p can support 60 frames per second, and its image fluency is double that of standard definition. Support large-screen display, 16:9 widescreen display, can greatly enhance the user's viewing experience.
High-definition picture quality provides favorable conditions for intelligent monitoring
HD surveillance can provide more content, more detailed high-definition picture, thus creating conditions for intelligent monitoring applications.
Analysis of Problems in HD Monitoring Application
HD network cameras have made a qualitative leap in image clarity, but they have also brought a series of real problems to high-definition surveillance systems. The three core issues to be solved by HD monitoring are: bandwidth issues, display problems, and storage problems.
Bandwidth issues
Due to the current limited network bandwidth, the high bit rate brought by high-definition video has become its biggest promotion bottleneck. How to transmit as high quality video as possible with the lowest possible bit rate is the top issue that HD surveillance needs to solve. At the same time, due to the heterogeneity of the network, different networks have different channel characteristics. Different users enjoy different network bandwidths. Even the bandwidth of the same user may change at any time. With the development of the monitoring field, various user terminals have the need to connect to monitoring video. For example, the network bandwidth of the local area network monitoring network is ideal, and users want to browse high-quality video. However, due to the limited bandwidth in the field of mobile phone monitoring, users value the low code. Rate video fluency. How to adapt to these different bandwidth environments is also a problem that HD surveillance devices need to solve.
Display problem
Compared with standard definition video, the amount of high-definition video information is abundant, and the corresponding performance requirements for decoding and display are also greatly improved. For example, currently mainstream PCs can easily achieve 8-channel D1 standard definition video decoding display, but if the front end is 1080P HD video , can barely decode and display 1 way.
For large surveillance camera platforms, if all HD video is used, server decoding pressure will be great.
Storage problem
The increase in image resolution will inevitably consume more storage space. Using H264 encoding algorithm, in order to ensure clarity, the code stream needs to be maintained at 6Mbps or more, which is about 4-8 times of standard definition video. Under standard definition video conditions, a 16-channel DVR built-in 8 fast 2T hard disk can meet the long-term video storage requirements. In high-definition monitoring, this time will be greatly shortened, which will bring about increased storage costs.
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