Speaking of wide dynamics, you may have seen it in the advertising words of major monitoring products. However, what is it? What is the use? Where is it used? In the mixed security monitoring products, what is the wide dynamic? The role of these non-professionals is difficult to say clearly, this is the meaning of this article, do not seek comprehensive coverage, only to clear the truth.
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As we all know, when the wide dynamic technology has not really been applied to the camera, there are technologies such as low illumination, filter, focus adjustment, and backlight compensation to cope with the backlighting environment. However, each technology has its own application limitations, and wide dynamics in a sense, make up for the shortcomings of the previous technology and give better results.
It is understood that there are three broad dynamic forms that are currently on the market:
The first type: Korean DSP digital processing wide dynamic
Korean DSP digital processing is very simple and simple. It is to perform two exposure processing on the image. The camera first performs a quick exposure on the bright area to obtain a clear and normal image of the bright area and stores it in the data buffer memory. A slow exposure is performed in the dark area of ​​the scene, and a clear image of the dark area is also stored in the data buffer memory. After the above exposure is completed, the image-specific algorithm is used to cut the appropriate portions of the two images, and finally the superimposed composite is output and an image with clear light and dark areas is displayed.
Based on the above technology, people in the industry usually call it "false width dynamic". Shenzhen Anweike Electronics Co., Ltd. (hereinafter referred to as Anweike) Zhang Junlin Zhang said: "Wide dynamic technology comes from abroad, and early sold in the form of modules, the price is relatively expensive, and the Korean DSP digital processing wide dynamic price Compared to other technologies, it is 50% lower, so there is still a part of the market."
Second: American Pixim wide dynamic
Based on the technological development of Stanford University in the 1990s, Pixim developed a new image pickup system based on CMOS technology, DPS (Digital Pixel Processing System).
In wide dynamic processing, DPS uses a separate exposure for each pixel and ARM7 control technology, which has a higher dynamic range than DSP double exposure imaging. In numerical terms, the current processing technology of CMOS cameras using DPS technology can reach 95dB or even 120dB. DPS also solves the deficiencies of CCD sensors in processing dynamic range and color authenticity, and its color reproduction is more realistic and can meet the requirements of applications.
However, since DPS is based on a separate processing technique for each pixel, each pixel contains a complete set of processing circuits, which also greatly reduces the photosensitive area of ​​each pixel, that is, the amount of light is reduced, and the result is based on CMOS. The sensitivity of the camera with DPS technology has a significant impact, or is not satisfactory.
Third: Sony Eiffo-P wide dynamic
Anwei Ke Zhang said that compared to the above two wide dynamic technologies, Sony EFFIO series cameras are more popular, and EFFIO-P is the latest wide dynamic technology solution launched by Sony in the past two years.
According to reports, EFFIO-P camera adopts SONY's latest technology sensor, supports and cooperates with CCD dual scanning, can achieve a truly wide dynamic function, and can also display a clear picture under the environment of extreme backlight and brightness contrast.
In addition, it is understood that Sony's subsidiary in the United States has entered into a definitive agreement to acquire Pixim's Silicon Valley company and has a professional technology security camera chipset design.
Sony's official website revealed that Sony will leverage its image sensor technology and engineering expertise to further enhance its global design and support capabilities.
In this regard, it is not difficult to see that Sony is seeing some of the new technologies that can be combined with Pixim, as well as its potential resources, while developing a bright future for new solutions.
No matter who the research group is, no matter who the wide dynamic technology ends up, as a very practical wide dynamic camera, the development of technology will inevitably be better. Only in this way can it be accepted by more users and enter thousands of households.
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