Analytical clarity of HD IP Camera

Analytical clarity of HD IP Camera
How to determine the merits of a camera ? Most users come to understand the network camera via parameter index and then make a judgment. Users rarely have the opportunity to , or able to devote the time cost to pager test for a new camera. Therefore, the understanding of a product , or start from Specifications . Network camera parameters of concern include : CCD size, horizontal resolution , minimum illumination value , SNR , shutter speed and other basic parameters, automatic white balance, automatic gain power supply, installation, communication interface hardware supporting conditions . How to make a quick judgment on product selection must first clear demand for the corresponding study focused on the demand indicators .
Minimum illumination indicator. This is an important parameter of analog cameras , but the camera parameters can be said that most of mystery index ( no one) . The illumination of the IP Camera , also known as the camera sensitivity. Factors affecting the value of the minimum illumination camera has many , including cameras with the amount of light through the lens parameters ( ie F value ) , certain functional parameters CCT parameters IRE video level amplitude level , and camera settings. First, the amount of light parameters. An aperture of F1.4 lens is twice the amount of light levels F1.2 lens, F1.0 lens F10 was 100 times the amount of light through the lens . Therefore, the use of different lenses F value , determination of minimum illumination will have a decisive impact on the value of the camera . Secondly, the light source color temperature. Color representation is a wavelength of the light source of the content index , a light source of 3200K most wavelengths between 600 nm and 900 nm, and a light source of 9300K most wavelengths between 300-500 nm, so different color temperature will revolutionize test results. On a typical CCD sensor , a 600 nm wavelength light than the wavelength of 900 nm wavelength light source produces 10 times more than electrons . That is why the special mark on the illumination color temperature measurement results of significance. Third, the IRE level . The maximum amplitude of the CCD camera video output is generally set at 100IRE ( or 700 mV ) , a 100IRE said video monitor can completely drive the best performance of a high-quality image brightness and contrast .
50IRE that only half of the video contrast , 30IRE ( or 210 mV ) represents only 30 % of the original amplitude value is generally available image 30IRE lowest performance. So there is no marked IRE minimum illumination level of the measurement results are not comparable with the actual . Finally, there is a special feature of the camera settings. Some cameras have a frame accumulation ( also called sensitivity enhancement ) function, which is to reduce the scanning speed of the way to make the CCD accumulate more electrons in the uptake of each frame , in order to highlight the picture showing a low-light environment. Open this feature allows the illumination measured value exponentially increase. If the camera 512 times sensitivity enhancement can easily reach the next level 0.0001Lux Star level , but the sacrifice is an image of continuity , a sense of animated images presented in full. In summary, a minimum illumination with meaningful indicators should note its F value , color temperature , IRE levels and whether to open the frame accumulation settings, such as 0.5Lux (F1.45600K30IRE, sensitivity enhancement OFF).
In order to better " understand" specification parameters , we need to understand the impact on product performance "mystery" under the larger parameter index . With surveillance cameras , for example, we have a brief analysis of clarity , the illumination of these two indicators focus on the higher degree of concern .
Clarity index . This is the parameter to see the product page color network camera when the first thing would be of concern. In a sense , clarity index of the camera determines its quality. The vast majority of analog products now on the market with more than 500 lines of horizontal resolution , some products are 960H program has reached a level of 700 lines. Pixel digital camera is more of it to reach the performance level of sharpness levels , such as 1.3 million pixels , 2.0 megapixel , roughly corresponding to 700TVL and 1000TVL. However, individual businesses or sweeping case vacuity also exist . If monogram horizontal resolution analog cameras 540TVL, will find little attention and there were the words "central clarity ." This is what you mean? Limited by camera comes with lens, CCD + DSP programs and other factors , some IP Camera can only location near the center of the image showing the highest resolution , but at the edge of this resolution can not be reached , the overall average resolution perhaps only 520TVL, or even lower. Therefore, the need for additional attention to be selected .
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