For video surveillance, image clarity is undoubtedly the most critical feature. The clearer the image, the more obvious the details, the better the viewing experience, and the higher the accuracy of application services such as intelligence. Therefore, image clarity is the eternal pursuit of video surveillance. The author talks about the big misunderstandings of HD surveillance images:
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High-definition monitoring changeable concept misunderstanding
Speaking of high-definition surveillance, in fact, as early as 2010, the industry has been classifying what is HD and what is SD. It doesn't make sense for such a dispute. The number is just a standard for measuring images. If I tell you that I am HD, you will agree with the image when there is no contrast. Therefore, the concept of high-definition monitoring is not in value, but in reality. At this point, the author wants to tell friends who want to buy monitoring products, because the virtual standard in the store is very serious.
HD lens = HD quality? I have also fallen into this formula misunderstanding. Indeed, we should understand the truth of a good horse with a good saddle, but we cannot ignore the truth of the door. If you only pay attention to the image function, the principle of the surveillance camera and the SLR camera is the same. There are also CCD/CMOS sensors, zoom lenses, and image processors, but the surveillance camera imaging pixels are slightly lower.
According to reports, surveillance cameras have good imaging effects and bad lenses only account for a part of the factors, more important is the core technology of the product body. In the case of IP surveillance cameras, the DSP processing technology capabilities of different manufacturers may also result in different image effects. The sharpness of the surveillance image is determined by the resolution of the surveillance camera. Of course, the minimum illumination, signal-to-noise ratio and even wide dynamics also affect the imaging quality.
But then again, a million HD surveillance cameras can't be equipped with low-end lenses. Millions of lenses with millions of HD cameras seem to be the most perfect. If you are not against the trend, I am afraid you will follow the picture below. The key to the standard is very important!
Who depends on DVR imaging?
After talking about the misunderstanding of the front-end HD image, let's talk about the back end. The front-end HD surveillance imaging backend can only be SD, who? Maybe many people have such doubts, the front-end monitoring is obviously a megapixel HD surveillance camera, how can the backend show a D1 effect? ​​You know Is this depending on your DVR.
Let's take the DVR as an example. Many people only care about how many cameras can be used when purchasing DVRs. Is it H.264 codec format and whether the video is smooth? In fact, DVR also has image quality comparison. Do you know the ability of different DVRs to process images? Similarly, the current mainstream DVR imaging quality is D1 effect. If the D1 image resolution is 720x576 according to the pixel ratio, D1 basically meets the standard requirement with 720p image.
Two small details that cannot be ignored: the “accessories†of sensors and sensors
The same way that the lens is matched with the camera, as long as the front camera can surpass the D1 effect, the quality of the DVR can reach your standard. For the NVR, in terms of the author's understanding of current products and performance, this does not apply to small security projects. The complicated combination of IPC+NVR+ switches must be too price-consuming.
Looking at it now, the basics of the relationship with HD surveillance imaging are also detailed. As the industry has said, whether it is a common network camera or a megapixel camera product, the most basic and core is the breakthrough of sensor technology and the innovation of codec technology. Image effect and lightness are the eternal theme. It is also critical for assistive technology.
ISP has evolved from high-definition camera-assisted technology to a key core technology. Not only that, in order to meet the needs of alternative HD monitoring, some manufacturers replaced CCD sensors with CMOS; covering gain control, white balance, noise control, exposure control and other technologies. As a non-mobile video device, it is not impossible to have a sensor built-in image signal processor. The integration of the module further enhances the image quality and has a perfect performance in exposure, auto white balance and color saturation.
The 3D digital noise reduction function enables CMOS HD cameras to obtain the same or even better quality images than the same size CCD in low illumination environments. In addition, CMOS has a high dynamic range, and the image display will be clearer in harsh environments. The color reproduction will be higher.
The author helps you analyze several common small misunderstandings for high-definition imaging. Obviously, for image imaging, whether it is surveillance lens, surveillance camera, DVR, sensor and ISP, HD image generation is not a one-step process, nor is it unilateral. It can be achieved that the generation of a high-definition image requires multiple parts to work together. This is also the most amazing place for surveillance cameras.
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