參數(shù)資料
型號: AT76C453AC-MY19T
廠商: E2V TECHNOLOGIES PLC
元件分類: 圖像傳感器
英文描述: IMAGE SENSOR-CMOS, 708(H) X 494(V) PIXEL, 30fps, SURFACE MOUNT
文件頁數(shù): 40/44頁
文件大?。?/td> 768K
代理商: AT76C453AC-MY19T
5
5446A–IMAGE–02/06
AT76C453AC-MY19T
5.2
Signal Processing
5.2.1
Analog Signal Processing
The Correlated Double Sampling (CDS) output signal is applied to a high performance Analog to
Digital Converter (ADC). The ADC converts the analog CDS output signal into a 12-bit digital
video stream.The input stage of the ADC converts the single ended input signal into a differential
signal. Then a number of quantization stages take care for a high precision quantization.
A black loop is included around the ADC to have the average digital output code of the black ref-
erence pixels on a predefined level. The loop takes care for optimum use of the ADC input range
in all operating conditions and for all production parts.
5.2.2
Raw Data Processing
Behind the ADC three raw data processing circuits are passed before the data is applied to the
embedded Camera Signal Processing (CSP) function.
The first one is the Digital Programmable Gain Amplifier (DPGA). Because of the incorporated
high performance ADC digital amplification is possible. This is justified because the noise of the
analog core up to the output of the ADC is dominated by the pixel reset noise (kT/C noise). This
means that the ADC is nicely quantizing the pixel noise and therefore analog gain is superflu-
ous. The DPGA gain range is 30 dB.
Next step is the on-the-fly Defect Pixel Correction (DPC). The circuit detects and corrects single
white pixels. Neighboring pixels from the same color plane as well as pixels from the other color
planes are used in a quasi two-dimensional way to detect defects. Although tuning options exists
it is believed that the default DPC-settings offer optimum circuit performance.
Finally the data passes a shading correction (anti-vignetting) circuit to correct forshading caused
in the optical path.
5.2.3
RGB Processing
Figure 5-2.
RGB Processing
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