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| Black balance ： ウィキペディア英語版 |
Black balance
Video cameras can possess a function called black balance which calibrates the signal for no light, just as they have a "white balance" function which gives reference to true white to the CCDs. Unlike white balance, black balance is not adjusted every time. This function is found in higher end 'professional' cameras rather than in cameras for amateurs.
==Purpose==
The main purpose of black balance is to eliminate any residual current being output from the pixel sites under conditions of complete darkness, often referred to as thermal noise. This is why the camera automatically closes the iris completely when it does the black balance.
Conditions under which black balance are typically done are when the camera experiences a large change in operating temperature, especially from colder to warmer. Otherwise, it is a periodic thing to allow for other minor factors that could come into play.
With CMOS sensor technology, black balancing may not be as necessary as it is with CCD type devices. It is common to talk about how clean and relatively noise free CMOS sensors are by design.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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