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        Technical support

        Industrial CCD camera functions and parameter settings

        2014-05-10

        1, synchronous mode selection
        On a single industrial CCD cameras, main modes of synchronization: internal synchronization, synchronization and external synchronization, power supply etc.Its specific function is as follows:
        Synchronization: camera built-in synchronous signal generator produces synchronization signals to synchronize signal controls;
        External synchronization: through an external sync signal generator-specific synchronization signal will be fed into the external synchronous input terminal of your camera, completed meet the needs of special control of the camera;
        Power supply synchronization (line lock, line lock): AC power supply complete the vertical synchronization with the camera.
        Made up of multiple CCD camera image capture system, hoping that all the vertical sync of input signal is video, to avoid picture distortion transforms the camera output.At this point, can be used with an external sync signal synchronous signal generator to produce multiple cameras to achieve synchronization of multiple camera image capture.

         

        2. automatic gain control
        CCD to CCD cameras usually have a video amplifier with amplification of the signals, the magnification is called gain.If the gain of the amplifier remains unchanged, in high light environments will enable video signal is saturated.Using the camera's automatic gain control (AGC) circuit as the environment changes in the internal and external illumination automatically adjust the amplifier gain, allowing the camera to be able to work within in a larger light.


        3. backlight compensation
        In General, CCD camera's AGC operating point is determined by averages the signal to the entire field of view.When a field contains a background area is very bright and a very dark future goals, as determined by AGC is not perfectly suited to vision.When you start the backlight compensation, child regions only for vision CCD camera is average to determine the AGC, resulting in improved image quality.


        4. electronic shutter
        CCD cameras are generally equipped with electronic shutter features, electronic shutter requires no mechanical parts.Cumulative time of CCD camera with CCD electronic shutter control.When opening electronic shutter, and CCD electronic shutter camera output is only turned on when charge light signals, signals were venting the remaining charge.At present, the CCD camera's shortest shutter time is generally 1/10,000 of a second;When electronic shutter is closed, the NTSC format camera, the cumulative time of the CCD is 1/60 seconds;For PAL system camera, is one-fiftieth seconds.
        Watch high shutter speeds for moving image will produce a "standstill" effect, thus greatly increasing the camera's dynamic resolution.At the same time, when electronic shutter speed increases, in CCD integral time, focused on the CCD of the luminous flux reduction will reduce the sensitivity of the camera.


        5. the γ (gamma) correction
        In the entire Visual system requires two conversions: CCD sensor converts the image to the light signals, known as PV;After transmission, the signals concerning the reception of returning the electrical signals to optical image duanyou display device, the so-called electro-optical conversion.In order for the receiver to reproduce an image consistent with the output to the original image must ensure the comprehensive characteristic of two conversions with linear characteristic.

         

        6. white balance
        White balance feature is only for color CCD camera whose main feature is the camera image to accurately reflect the actual phenomena.Is generally divided into two ways, manual white balance, and auto white balance.
        CCD camera's auto white balance function is generally divided into continuous and button modes.In continuous mode, camera's white balance setting is continuous with the view to identify changes in temperature adjustment range is generally 2800~6000K.This way is suitable for color temperature of the scene in changing situations during imaging, make colors more natural.But when little or no white in the scene, continuous white balance feature does not generate the best color effects;When it is in button mode, you can set the camera on a white target, then set the automatic switch, and remains in this position for a few seconds or until the image white.After performing a white balance, automatic reset switch to lock the white balance settings, white balance setting will be stored in the camera's memory, its scope is generally 2300~10000K.To set the white balance button * and most accurate, suitable for most applications.
        When the CCD camera is open the manual white balance, you can manually change the image of the Red or blue status, up to 107 for adjustments.Such as increasing or decreasing a red level, increasing or decreasing the blue one level, and so on.

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