Vivotek Supreme IP8151 White Paper page 5

3. Noise Reduction
High quality video and images rely on not only the image sensor, but also
the image signal processing (ISP) technology, which has been the
expertise of VIVOTEK for complete integration of the components of
camera sensor technology.
As the light signals are converted into electrical signals by the photodiode
array, these signals are then sent to the analog-to-digital conversion
(ADC) circuits, located adjacent to the photodiode on the upper portion of
the chip. Electronic noise is generated during the conversion process of
analog signals reaching the A/D converter (Figure 3). Under certain
conditions, even the occurrence of single-electron noise will be visible in
the image.
The new A/D conversion circuit design enables automatic noise
cancellation and reduction to dramatically improve the image quality of
analog signals before A/D conversion. After conversion, the noise is
further reduced for noise-free signals and unparalleled image quality
(Figure 4).
Noise
Noise
Build-up
Reduction
Fig. 3 Signal processing in a conventional CMOS sensor.
5
For Internal Use Only.