Analysis of megapixels HD IP Camera technology

Analysis of megapixels HD IP Camera technology
With the security monitoring technology continues to evolve, security monitoring market demand is also rapidly change. Due to the demand of the anti-terrorism and other security requirements of intelligent video surveillance system is increasingly urgent, so in recent years, high-definition video surveillance has become more clear direction, which means that the user monitoring requirements more attention in monitor the sharpness of the image, pay attention to the monitor screen in the extent to which the site is consistent, so that it can take advantage of the intelligent analysis technology to accurately identify abnormal target.
Million cameras constitute
Traditional analog camera is unable to meet the demand for high-definition image capture, HD has become the mainstream of the development of today's video surveillance. To achieve high-definition video surveillance, can not be separated from HD cameras, megapixels HD IP Camera products have emerged.
The emergence of million-pixel high-definition camera, laid the foundation for high-definition monitor the implementation of the program So what is a million-pixel high-definition camera?
Here the megapixels HD cameras, HD cameras IP-based network transmission. Constitute an example to introduce a general definition network cameras, lens, IR cut filter, the image sensor, clock synchronization coding compression and image processing motherboard, power supply and I / O network interface board, as shown in Figure 1 comprises, in order from front to back as shown .
In all component parts, the most critical is that the image sensor, excellent indicators not directly affect the high-definition network camera picture effect. Currently on the market most of the high-definition network cameras using CMOS as the photosensitive element, but compared with the CCD sensor, HD IP Camera has the advantage.
HD imaging results
Megapixel camera is just a general term for high-definition network camera industry, refers to a million and more than one million pixel high-definition camera, but the industry has not yet formed the relevant standard to define megapixels and HD. The so-called megapixels, the effective number of pixels of the sensor used in network camera reached more than one million at the same time, this HD camcorder output field screen resolution of at least to 1280 x 720. Today's mainstream 1.3 million pixels, 200 pixels, or even higher 5-megapixel network camera are megapixels level, the output image resolution is generally at least 720P (1280 x 720) or 1080P (1920 x 1080).
Judging from the current industry recognized standards, the video screen resolution of 720P HD is a basic requirement, and even some occasions called HD-ready 1280 x 720 resolution in the strict sense, has not yet reached 100 million pixels. And is generally recognized as the true high-definition images, video screen resolution needed to reach 1920 × 1080, that commonly referred 1080P.
Not difficult to see from the above-mentioned video screen resolution, million-pixel high-definition camera, video screen is the era of traditional analog cameras can not match, the improvement of clarity, the expansion of the field of view of the image, are the most prominent advantages.
On the one hand, from the resolution numerical comparison: resolution comparison from Table 1, we can clearly see that million-pixel high-definition camera screen resolution has several times in the advantages of the traditional camera clarity.
In addition to the video picture clarity level, the practical application there is a very important requirement that the real-time nature of the video screen, the PAL format, up to 25 frames / sec transfer and playback frame rate. Currently the most megapixels cameras on the market in 720P or 1080P resolution format can achieve 25 frames / sec high frame rate transmission and rendering, and the most up to 2560 × 1920 resolution, ultra-high-definition camera can not achieve such definition of real-time rendering.
In actual applications, customers tend to have a very clear monitoring requirements, as well as to achieve the objectives and requirements. Such as bank teller control, need to be able to clearly see the face of every coming for business personnel; traffic road monitoring, need to be able to clearly see the license plate number of the vehicle by each lane. In order to meet these special requirements, the use of traditional non-high-definition monitor, often require a teller, each lane separately to install a video camera, in order to narrow the monitoring perspective, to ensure the clarity of control objectives.
Megapixels HD IP Camera application, you can use the one million-pixel high-definition camera instead of multiple non-HD camera and to meet the need to use multiple traditional cameras in order to achieve the monitoring results.
Three-lane road monitoring, if you use the SD D1 resolution format cameras to monitor For a clear license plate information, you need to install a camera for each lane, 3 cameras to the entire lane is completely monitoring.
Million-pixel high-definition camera, a video camera on a three-lane monitoring can be achieved, and to obtain a clear license plate information.
HD monitoring program can be completed in 3 lanes only need a high-definition camera monitoring the emergence of megapixels HD camera is undoubtedly brought great convenience to the majority of users, but also makes security monitoring quality has been greatly improved, accelerate the exit of existing markets while also continue to make traditional analog cameras. The face of the many advantages of millions of high-definition network camera, if you want to select the higher pixel camera surveillance effect in practical applications the greater good? In actual fact, the million-pixel high-definition certainly bring to enhance the quality of the screen, but it also should see their impact on the increase in network bandwidth, and storage space requirements to enhance, such as 1080P HD screen in five times the clarity SD D1, screen under D1 resolution transmission, only 1M bandwidth is required to transfer and storage, 1080P HD transmission bit rate up to 6M transmission and storage. Million-pixel high-definition camera for HD monitoring program construction, needs to consider the input of the transmission and storage, choose the most suitable high-definition camera, and is not just the choice of five megapixels, even tens of millions of pixels; perhaps 1.3 million, 200-megapixel camera is the most suitable choice.
Million-pixel high-definition camera, you must also choose the right camera lens, you first need to choose to use high-definition lens, still use ordinary non-HD lens, then you will not be able to showing megapixels ultra-high resolution HD camera effect. In addition, according to the environment and to monitor different objectives and requirements, but also to choose the right focal length lens, is to choose to meet the objectives and requirements of monitoring vision lens. Such as wide-angle lens, viewing angle, generally more than 90 degrees, suitable for monitoring large-scale, short-range establishments; choose a telephoto lens, viewing angle less than 20 degrees, is mainly used for a wide range of ultra-long-range environmental monitoring, such as the altitude of the forest, stadiums, harbors hope surveillance.
Intelligent application
Throughout million-pixel high-definition IP Camera on the market, there are many models of all kinds of different characteristics, with high-definition camera with features than the integration of intelligent video analysis technology, to become one of the highlights in the development of high-definition camera, such as smart-definition network camera, intelligent video analysis technology megapixels HD organic fusion.
Intelligent video analysis technology has become the development direction of the mainstream of today's technology, continue to be widely used here does not make a specific analysis of this technology, and focuses on the application of intelligence and high-definition two-pronged approach.
Megapixels brings a high-definition picture quality, the video surveillance into the era of high-definition monitor, but did not change the traditional passive monitoring mode.
Live images of high-definition display of course, bring to the monitoring of the high quality visual experience, but still can not change many key observation of the monitoring site, easy to miss the passive situation. And then clear the screen, if not alarm occurs when the first time to the monitoring personnel receive alerts, the effective value will be greatly reduced. Warning efficacy of intelligent video analysis, the first time the police intelligence high-definition screen pop-up, will greatly enhance the efficiency of its monitoring.
In the era of traditional analog cameras monitoring camera itself does not have video processing DSP chip can not be intelligent video analysis algorithms embedded into the camera, in order to achieve the intelligent monitoring, additional intelligent video analysis equipment, cost and maintenance effort are larger. Million-pixel high-definition camera with video processing DSP chip motherboard, so you can achieve the intelligent video analysis algorithms embedded in megapixels HD IP camera. Intelligent video analysis algorithms will take up the processing power of the DSP, in order not to affect the video compression, to ensure the quality of the video screen, as well as intelligent video analysis algorithms to ensure sufficient computing resources in order to achieve higher performance, dual DSP chip manufacturers to adopt , on the one hand, to ensure that millions of high-definition picture quality, on the other hand, to ensure the performance of the intelligent video analysis.
Based megapixel camera, which laid the foundation for the realization of intelligent video analysis capabilities. As we all know, the intelligent video analysis is based on image analysis of events, the premise is the image, the image is clear or not directly determine the accuracy of the analysis of the event. Megapixels the emergence of intelligent analysis provide a high-definition image sources, intelligent video analysis accuracy is also increased dramatically, there are already manufacturers intelligent video analysis accuracy accurate to 3 × 3 pixels in size, if not a high-definition do to ensure that the video source, this accuracy is difficult to achieve. The emergence of megapixels HD IP Camera, not only for our naked monitoring high-definition images, as well as equipment intelligent analysis provides a high-resolution analysis of the source, easy to control intelligent.
Applications, as described previously megapixels HD IP Camera require high bandwidth to carry high-definition image transmission, if all high-definition images are transmitted to the monitoring center for check-in staff monitoring, will no doubt take up a lot of network bandwidth resources, The integration of high-definition video camera with smart technology, making the front of the camera can automatically filter high-risk event, warning the filtered image selected transmission monitoring center, so that will greatly reduce the dependence of HD monitoring solution for network bandwidth resources, dramatically reducing the HD overall solution cost.
Megapixels and smart analysis is undoubtedly the two most popular theme of today's surveillance market, the two combined, I believe that it shall, regardless of the form of products or from the program practical point of view, are the most efficient and practical combination will be the future direction of development.
Epilogue
With the development of video compression technology, chip technology to enhance video compression ratio rising network bandwidth consumed in the same picture quality as well as the storage space will be reduced when more megapixels HD IP Camera The popularity of the 5 million or even 10 million-pixel high-definition camera is bound to gradually gained popularity applications.
From:http://www.vstarcam.com/channel/Analysis-of-megapixels-HD-IP-Camera-technology-91.html