Detailed video camera three wide dynamic technology forms

Speaking of wide dynamics, everyone may have seen it in advertising words in major monitoring products. However, what exactly is it? What's the use? Where is it used in? Roles? These non-professionals estimate that it is difficult for someone to speak clearly. This is also the meaning of this article. It does not seek comprehensive coverage. It only seeks to clarify Dao Ming.

As we all know, when the wide dynamic technology has not been truly applied to the camera, there are low illuminance, filter, focusing, backlight compensation and other technologies to deal with the environment of the backlight. However, each technology has its own application limitations, and wide dynamics, in a sense, well compensate for the deficiencies of previous technologies and give better results.

It is understood that there are three types of wide dynamic formats that are currently on the market:

The first type: Korean DSP digital processing wide dynamic

Korean DSP digital processing is simple and broad. It means that the image is processed twice. The camera first performs a quick exposure of 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 with a dark area is also stored in the data buffer memory. After the above exposure is completed, using the DSP-specific image processing algorithm, the brightness of the two images is properly cut off, and finally a superimposed synthesis and output of an image clearly visible in light and dark areas.

Based on the above techniques, people in the industry often call it "false dynamics." Shenzhen Anweike Electronics Co., Ltd. (hereinafter referred to as Anweike) Zhang Junlin Zhang said: "Wide dynamic technology comes from abroad, and early in the form of modules sold, the price is relatively expensive, and Korean DSP digital processing wide dynamic price Compared to other technologies, it is 50% lower, so there is still a part of the market."

The second: American Pixim wide dynamic

Based on the technological development of Stanford University in the 1990s, Pixim Corporation developed a new image pickup system based on CMOS technology, DPS (Digital Pixel Processing System).

In wide dynamic processing, DPS uses a single exposure and ARM7 control technology for each pixel, which has a higher dynamic range than DSP double exposure imaging. Numerically speaking, the CMOS camera with DPS technology can achieve 95dB dynamic range or even 120dB with current processing technology. 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 application requirements.

However, since DPS is based on a separate processing technology for each pixel, each pixel contains a complete set of processing circuits, which also greatly reduces the photosensitive area per pixel, that is, the reduction in the amount of light, and the result is based on CMOS. The sensitivity of the DPS camera is significantly affected or not very satisfactory.

The third type: Sony Eiffo-P wide dynamic

Anweike Zhang said that compared to the above two wide dynamic technology, Sony EFFIO series cameras are more popular, and EFFIO-P is the latest wide dynamic technology program launched by Sony in the past two years.

According to reports, the EFFIO-P camera uses SONY's latest technology sensors to support and cooperate with CCD dual scan, and can achieve true wide dynamic function, and can also display clear images in the environment with extremely high 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 chipset design for professional security cameras. Sony Information revealed that Sony will use its image sensor technology and engineering design expertise to further strengthen its global design and support capabilities.

In this regard, it is not difficult for us to see that Sony is seeing some new technologies that can combine Pixim's technology, as well as its potential resources, while developing a bright future for new solutions.

Regardless of who the research group is, regardless of who the wide dynamic technology will eventually end up being, as a very practical wide dynamic camera, the development at the technical level will inevitably strive for excellence. Only in this way can it be accepted by more users and thus enter millions of households.

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