The advent of wide dynamic camera

When it comes to professional monitor USES the camera, its history can be traced back to 1957. From the perspective of the history of previous surveillance cameras technology to promote mainly depends on the improvement of three basic performance indicators, namely, image resolution, sensitivity and [wide dynamic range. The image resolution and the intensity of illumination, they are as the first half of the 1980 s the CCD camera and the advent of rapid development. In order to more close to the human eye observation target, many vendors continuously carrying on the research and development work, and finally in 1997, panasonic can successfully developed a sharp rise in the wide dynamic range of the technology, and the super wide dynamic series (the first generation of the super dynamic series/WV - CP450 series and WV - CS650 series) into the market.

When people are in place for illumination difference is very apparent during the use of surveillance cameras, for example in a indoor with outdoor light into the film, and so on and so forth, is unable to see the dark, or some such bright place to present all white. And solve the problem it is super wide dynamic camera series. This type of camera can provide more natural quality, therefore, to launch soon become the standard of the industry camera.

The development of the wide dynamic camera

Since then, according to customer demand, and represented by panasonic some vendors of super wide dynamic camera to further improvements. Panasonic in 1999 launched the second generation of super wide dynamic camera (SDII/WV - CP460 series/WV - CS850 series). SDII makes the advent of wide dynamic range have been improved, and extended the product lineup, wide dynamic range has reached 2 times before the camera, and in the lineup, in addition to machine gun camera and indoor integrated camera, and outdoor dedicated integrated camera, prevent PoHuaiXing camera, network camera SDII technology is adopted. Then, in 2001, panasonic is introduced which has the function of color/black and white conversion camera (WV - CP470).

WV - CP470 development as a starting point, the second generation of panasonic super wide dynamic camera series of r&d in strive to further improve the dynamic range at the same time, also to the improvement of the performance of the other basic took a big step and intelligent direction. In April 2005, the third generation of the super dynamic camera (SDIII/WV - CP480 series/WVPCS950 series) came out, it not only greatly improves the basic performance, but also by panasonic unique figure yi technology, realize the intelligent function of the camera?

Technology development

Super wide dynamic camera was able to improve the dynamic range, mainly due to the development of CCD and DSP core technology, 貱 CD development, made by a single CCD can just 1/50 of 1/50 of a second, and high-speed two shutter speed signal and sent to the DSP. Panasonic unique super dynamic DSP, after the short and long signals to synthesis, transport more natural quality. Mentioned the shutter speed, when the first generation of 1/2000 of a second, the second generation for 1/4000 of a second, the third generation is up to 1/8000 of a second. Moreover compared with does not have the super dynamic function of the camera, dynamic range by the first generation of 40 times quickly ascended to 160 times of the third generation.

When we mentioned the wide dynamic, in addition to using 80 times, 160 times the expression, also use 48 db, 54 db. Conclusion although is the expression for the same meaning, but if the simple explanation, are as follows:

When the 100 IRE ((IRE (the units of said TV signal amplitude, 100 IRE (= 700 mv) as the standard, the ordinary camera (called V1) wide dynamic range is 10 db. Such as the second generation of super wide dynamic camera (called V2) wide dynamic range is 48 db, and the difference between ordinary camera for 38 db.

Use "N dB = 20 log/V1, V2" this formula, the N = 38 dB, V2 / V1 = 80. That is to say, with ordinary camera is 80 times better. By analogy, the third generation of super dynamic range is 54 db, to paraphrase the formula can be concluded that the results for 160 times.

Advanced features

As described earlier, last year started selling the third generation of the super dynamic camera, its and the improvement of the performance of the basic function of intelligent made great achievements in both the two direction of technology development. In particular has the following three points.

Based on 160 times each pixel wide dynamic range

Area a is divided into four previous calculation of gray level in the third generation of the super dynamic camera, is developed to correspond to any super dynamic in the field of technology, namely according to the bright degree of the object to be taken for each pixel gray grade calculation, and to optimize the image synthesis, and the whole area.

With functions of automatic back focal adjustment (ABF)

By using ABF function, solved the focus slightly offset in color/black and white conversion problem.

Intelligent image processing

In the third generation of the super dynamic camera, intelligent image processing technology has been applied on the DSP, realize the function of automatic tracking, camera interference detection, intelligent functions such as automatic image stabilization function.