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الموضوع: استفسار ضرورى بشان بعض الاختصارات الخاصة بكاميرات المراقبة

  1. #1
    Junior Engineer
    تاريخ التسجيل
    May 2015
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    استفسار ضرورى بشان بعض الاختصارات الخاصة بكاميرات المراقبة

    السلام عليكم ورحمته وبركاته
    احبتى فى الله
    لو امكن اريد مساعداتكم بخصوص معنى بعض الاختصرات فى تفاصيل كاميرات المراقبة

    1- معنى TDN
    2- معنى WDR
    3- معنى DNR
    3- معنىOSD

    ولكم منى جزيل الشكر

  2. #2
    Junior Engineer
    تاريخ التسجيل
    Apr 2014
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    رد: استفسار ضرورى بشان بعض الاختصارات الخاصة بكاميرات المراقبة

    1- معنى TDN
    True Day and Night

    "True day/night" (TDN) cameras can have self-contained IR illuminators or not. What distinguishes a TDN is the presence of an IR cut filter. CCD sensors are sensitive to both IR radiation and visible light radiation. It is the IR radiation that gives you "night vision". IR radiation is more plentiful in most low visible light situations. Of course, by adding IR illuminators, this adds to the IR radiation that is being seen by the camera.

    So being able to "see " in IR radiation greatly helps the night vision. However, seeing the IR radiation at the same time when there is plenty of visible light tends to wash out the picture. To improve picture quality during the day, the IR cut filter moves in front of the sensor, blocking the IR radiation and allowing only the visible light to pass.

    TDN cameras must have a mechanical mechanism of some type that moves the IR cut filter infront of the sensor during the day, while retracting it at night.
    2- معنى WDR

    Wide Dynamic Range

    Wide dynamic range is a feature in some network cameras that handles a wide range of lighting conditions in a scene. In a scene with extremely bright and dark areas or in backlight situations where a person is in front of a bright window, a typical camera would produce an image where ******s in the dark areas would hardly be visible.
    WDR solves this by applying various techniques to enable ******s in both bright and dark areas to be visible.
    3- معنى DNR

    Digital Noise Reduction

    Image noise is interference in the video signal that shows up as grainy specks. It can be caused by low lighting situations, a nearby power interference, heat, or device algorithms.
    DNR is a technique of removing image noise from a video signal by applying a digital comb filter. It makes images clearer and reduces video file size.
    A 2D filter reduces the noise that can be found in low light images. This type of filter is sometimes confused by motion, resulting in blur trails.
    A 3D filter goes one step farther and effectively reduces the noise in static images and images with movement.
    4- معنىOSD

    On Screen Display

    OSD stands for On-Screen Display. It is an integrated on-screen menu that can be accessed within the camera to change its functions that effect how the camera processes an image. Static cameras without an OSD is more-so a camera which is just a plug and play camera. You can install these cameras and once they’re plugged in, you’re done setting it up. However, if you’re pointing this camera at a window or in an area with lighting that causes issues with how the camera sees, this will be an issue and can render the camera useless. This is where an OSD comes in handy. It’s a group of settings that you can change within the camera’s chipsets to fix many of these types of issues. Once you access a cameras OSD menu you can change functions such as Exposure, ACG, Iris Levels, Shutter Speed, White Balance, Back Light Compensation, and many more.

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