| 3 | Camera | Q. What are ICR, TDN, and DDN? | 2013-04-28 |
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A.
ICR ICR (Infrared Cut Filter) is used with color CCD or CMOS image sensors to produce accurate color images. During the day, the camera uses an ICR to reflect or block mid-infrared wavelengths while passing visible lights. However, as light diminishes below a certain level, some cameras can automatically turn off ICR functionality to deliver high-quality, black and white image using infrared light.
TDN TDN (True Day/Night) technology supports night vision capability by implementing a physical ICR that is removed by a mechanical motor.
DDN DDN (Digital Day/Night) technology allows for viewing in both day and night conditions, without the use of an ICR. As light diminishes below a certain level, DDN technology switches color image to black and white image to offer similar benefits to TDN at a lower cost. At night, the captured image depends on the lighting and infrared waves off objects. |
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| 2 | Camera | Q. What is DOF? And, What is difference between deep DOF and shallow DOF? | 2013-04-28 |
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A.
DOF (Depth of Field) refers to the range of distance that the subject appears acceptably sharp. DOF is determined by several factors such as aperture size, a lens to subject distance, lens focal length, and image sensor size. |
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| 1 | Camera | Q. What are the main differences between indoor and outdoor cameras? | 2013-04-28 |
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A.
Surveillance cameras can be classified as indoor and outdoor models according to the installation place. The main difference between the two models is whether the camera is weather-proof or not. That is, the outdoor camera does completely protect the inner material from weather like wind, rain, moisture, dust, snow, and humidity. Some outdoor cameras should have a heater or blowers for temperature resistance. On the other hand, indoor cameras do not require weather-proof or temperature resistance except critical places which get high humidity or high/low temperature. |
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