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[C]CMOS (Complementary Metal-Oxide Semiconductor)
CMOS traditionally consumes little power. Implementing a sensor in CMOS yields a low-power sensor. CMOS chip can be fabricated on just about any standard silicon production line, so they tend to be extremely inexpensive compared to CCD sensors.
[C]CCD (Charged Coupled Device)
CCDs use a special manufacturing process to create the ability to transport charge across the chip without distortion. This process leads to HQ sensors in terms of fidelity and light sensitivity. CCDs use a process that consumes lots of power. CCD consumes a much as 100times more power than an equivalent CMOS sensor. CCD sensors have been mass produced for a longer period of time, so they are more mature. They tend to have higher quality and more pixels.
[B]BLC (Back Light Compensation)
In images where a bright light source is behind the subject of interest, the subject would normally appear in silhouette. BLC allows the camera to adjust the exposure of the entire image to properly expose the subject in the foreground. However, WDR is a more effective alternative to BLC because it handles multiple exposure zones to give both the highlight and low light areas a proper exposure.