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Wide dynamic surveillance technology has broad prospects by guard summer
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Wide dynamic surveillance technology has broad prospects |
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Electronics,Telecommuting,Science & Technology
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Wide dynamic camera generally use a dedicated DSP circuit, it first bright area in the subject with the most appropriate shutter speed exposure, and then the dark areas of the subject with the most appropriate shutter speed exposure, and finally captured the two images reassembled in an image by DSP digital signal processing chip, it expanded dynamic range that might be addressed, making bright areas of the subject and the dark areas of a subject can be clearly seen. The due to the natural light arranged from 120000Lux to the starlight night of 0.00035Lux, indoor illumination for 100Lux. The outside landscape illumination may be 10000Lux, surveillance cameras from indoor surveillance outside the window, the contrast between the two is 10000/100 = 100 : 1. Contrast the human eye can easily see, because the human eye can handle a 1000:1 contrast ratio, but the traditional security ip camera is not, because it is only a 3:1 contrast performance. Appear light and dark contrasting or backlit scenes security ip camera, the entire image is bright areas overexposed, while the darker areas are underexposed, thus not see the image of the brightest and darkest parts. Bank savings bank, an important place for entrance area, for example, cause difficulties because the incident light from the window, and the soft light from the ceiling fluorescent light may capture indoor and outdoor scene can not be a great contrast indoor outdoor scenes filmed. Surveillance cameras captured images will appear background is too bright prospects too dark, or clear background the prospects too dark and prospects for the background is too bright. The first solution is generally backlight compensation technology or set up two surveillance cameras to adapt to indoor and outdoor light contrast, but the effect is not ideal. Extended dynamic range technology came into being, that is the said today a wide dynamic WDR (WideDynamicRange) technology. CCD wide dynamic technology is the use of special DSP (digital signal processing) circuitry, the bright part of the most appropriate shutter speed exposure, then dark part of the exposure with the most appropriate shutter speed, and then the two images DSP processing re- combinations can see the bright part and the dark part. The 160-fold dynamic range technology with a large wide dynamic gray optimization, but its demanding DSP performance (especially processing speed). Restrictions due to the characteristics of the CCD, even with multiple exposure sampling method, the wide dynamic range of the camera only to 66dB. HD network camera available on the market almost added a wide dynamic range, high-definition CCD camera display high-definition effect only bright pastel environment while watching unclear high-contrast environment, it can only be regarded as pseudo-HD. Wide dynamic camera in a very strong contrast to see the characteristics of the image and the use of a technology, it is a good solution to the problem of image sensor dynamic range narrower than the human eye. It is noteworthy that, although the wide dynamic stage substantially in the era of analog cameras, but it witnessed the whole process of the camera changes by the analog era to the digital age, especially from U.S. rage PiximD2025P program year wide dynamic range in one fell swoop push to 256dB levels has not yet outdated. Fame last year the Exmor back-illuminated CMOS integrated multi-exposure wide dynamic technology and visibility enhancement (VE), Generally wide dynamic open sensitivity is reduced, but turn on this feature, not only wide dynamic range of more than 120dB, achieve wide dynamic amazing effect, and 2 times compared to traditional wide dynamic sensitivity to enhance the contrast increased by 4 times, image effect in low-light and strong chiaroscuro environment has been greatly enhanced and improved . Ip camera to be widely used, must be variety, low light, infrared, high-speed ball, backlight compensation, wide dynamic function, the complete series of products can be better applied to the actual project. HD network camera manufacturers a variety of products is too small, it will greatly hinder the application of high-definition monitor, so the development of the wide dynamic HD network camera is necessary. We know that the core of the surveillance cameras CCD, CCD manufacturers mainly in Japan and South Korea, due to CCD separate the different levels in the production process and manufacturers obtained in different ways, resulting in the acquisition of the CCD effect is different. A simple detection method is not connected to the lens of the camera is powered, then hand to shade the lens interface, there are no bright spots in the image, big snowflakes, and then connected to the lens of the camera at a bright-colored objects, view monitoring the color of the color cast, images without distortions, color and grayscale is smooth. 1997 Panasonic to develop new ultra-dynamic technology and apply it on the camera to the market. Followed by the world's major camera manufacturers are responding with a camera with a wide dynamic technology. All of a sudden, wide dynamic technology rapid development in the past few years, the dynamic range of the camera is also expanding, there have been two-speed CCD + DSP ordinary CCD + two-speed shutter technology. Wide dynamic camera generally use a dedicated DSP circuit, it first bright area in the subject with the most appropriate shutter speed for the exposure, and then the dark areas of the subject with the most appropriate shutter speed for the exposure, and finally the two images with DSP digital signal processing, will capture two images are reassembled in an image, it expanded dynamic range that might be addressed, so that the bright areas of the subject and the dark areas of the subject can be clearly seen. With the emergence and spread of DPS pure digital sensor technology, higher dynamic range and more realistic color will gradually appear in the new generation of wide dynamic camera. WDR IP Camera Apexis using DPS technology, the market response is good and I believe in the future of market testing will gradually manifest its charm. Can be expected in the near future, wide dynamic camera market will face competition in the DSP and DPS sensor technology, the dynamic range is bound to continue to expand and broad prospects.
Related Articles -
wide dynamic, surveillance cameras, security ip camera, HD network camera,
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