Wide dynamic technology is a very strong contrast to the camera to see the characteristics of the image and the use of a technology. When a high-brightness area such as a bright light source (daylight, lamp, or mirror, etc.), and a region where the relative brightness is low, such as shadows, backlight, etc., exist in the image, the image of the camera will appear in the bright area due to excessive exposure to white, While the dark area due to lack of exposure to become black, seriously affecting the image quality. The camera in the same scene on the brightest areas and dark areas of the performance is limited, this limitation is commonly referred to as the "dynamic range." Wide dynamic camera technology is characterized by the use of wide dynamic main solution to the camera backlight compensation problem.
From the technical realization of the main divided into the following two
The following are the same as the "
1, CCD + DSP technology:
Two - speed CCD with DSP processing. The core of this dual exposure (or dual shutter) technology is for scenes with large contrasts, and the camera first makes a quick exposure to the bright area, resulting in a clear and normal image of the bright area and stored in the data buffer; And then the scene of the dark area for a slow exposure, get a dark area of the screen clear images are also stored in the data buffer memory. After the above exposure, the use of DSP-specific image processing algorithm, the two images of the appropriate part of the brightness were cut down, and finally superimposed synthesis and output a bright and dark areas are clearly visible images. This will avoid the problem of excessive exposure and dark exposure, so that the entire screen is clearly visible to achieve a wide dynamic processing effect. However, if the use of different DSP chips, in the specific details or there are significant differences, such as sensitivity, color reproduction, white balance and other treatment.
2, CMOS + DPS technology:
DPS is used for each pixel alone exposure and control technology, combined with the use of CMOS sensor acquisition of multi-frame picture synthesis of a complete image of the linear superposition, compared to the CCD two exposure imaging has a higher dynamic range. From the numerical point of view, the use of DPS technology CMOS camera on the current processing technology, the dynamic range can reach 120dB. While expanding the dynamic range, DPS also solves the CCD sensor in dealing with dynamic range and color authenticity of the lack of its color reproduction more real, to meet the application requirements. A camera using this technology uses an analog-to-digital converter (ADC) in each pixel of the digital image sensor, which directly converts the digital signal into a digital signal when capturing the optical signal, minimizing the attenuation of the signal in the arrangement And interference.
At present, most of the universal surveillance network cameras use CMOS + DPS wide dynamic technology, the application of a wide range of scenarios, including finance, education, transportation and other fields. Wide dynamic has become a high-definition camera is a function of the market demand is very strong. WDR IP Camera.
With the wide dynamic technology continues to mature, the past two years, wide dynamic camera sales have been rapid growth; At present, wide dynamic has basically become the IP camera standard function. Multi-frame unity of the wide dynamic processing technology trends, wide dynamic effect is more smooth, transparent, wider dynamic range.
Key words: WDR, Wide Dynamic Range, WDR IP Camera
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