The pixel readout circuits of CMOS image sensors are largely noise reducing correlated double sampling
(CDS) circuits, along with a programmable gain amplifier (PGA) and an analog to digital converter (ADC).
Other methods have been used: double sampling
, ratio, and regression estimator approaches to improve precision (Eberhardt and Simmons, 1987; Hanselman and Quinn, 2004; Fujioka et al.
POSDATA's POS-Watch line fully leverage Tvia CyberPro's extensive features including three independent video ports, programmable video scaler, enhanced on-chip encoder, six 10-bit video DACs with a double sampling
clock for broadcast TV display, 24-bit digital RGB output, direct output to all worldwide TV standards, multiple composite video and S-Video outputs, component YPrPb outputs, multiple or simultaneous TV outputs, and the 64-bit graphics accelerator with alpha blending.
The chip includes an on-chip, nine-bit analog-to-digital converter (ADC) performing correlated double sampling
to improve image quality.
Calculated percentages were analyzed by using a confidence interval based on double sampling
error ([+ or -] [2m.
33 for low, medium, and high density strata, respectively) using standard double sampling
methods, and obtained a population estimate about 15% lower than calculated using the mark-recapture based SCF of 1.
The double sampling
was used to assess the reproducibility of the measurements, and the average value of the two samples was used to assess the effect of time (immediate assessment vs 1 h) and temperature (room temperature vs refrigeration).
Figure 1 depicts a double sampling
scheme for which [alpha] = x + 1, [beta] = y + 1 and v = t + 1 yields a likelihood of the form given by density (1).
Although data output is in raw RGB format, the chip integrates auto-white balance, auto-exposure, auto-gain control and performs correlated double sampling
The sensor also works in a rolling shutter mode with Correlated Double Sampling
(CDS) to reduce noise and increase dynamic range.
These features include correlated double sampling
(CDS), programmable gain, automatic or programmable black levels and offset calibrations, and a serial interface for register configuration.
One of the unique features of CMV12000 is the novel pixel structure, which combines pipelined global shutter operation with correlated double sampling