scholarly journals Using Polynomials to Simplify Fixed Pattern Noise and Photometric Correction of Logarithmic CMOS Image Sensors

Sensors ◽  
2015 ◽  
Vol 15 (10) ◽  
pp. 26331-26352 ◽  
Author(s):  
Jing Li ◽  
Alireza Mahmoodi ◽  
Dileepan Joseph
Keyword(s):  
Image Sensors ◽  
Cmos Image Sensors ◽  
Pattern Noise ◽  
Fixed Pattern Noise

scholarly journals Fixed Pattern Noise Reduction and Linearity Improvement in Time-Mode CMOS Image Sensors

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5921
Author(s):  
Miron Kłosowski ◽  
Yichuang Sun
Keyword(s):  
Image Sensors ◽  
Analog To Digital ◽  
Cmos Imager ◽  
Cmos Image Sensors ◽  
Pattern Noise ◽  
Offset Correction ◽  
Linearity Improvement ◽  
Photo Response ◽  
Fixed Pattern Noise ◽  
Dark Signal

In the paper, a digital clock stopping technique for gain and offset correction in time-mode analog-to-digital converters (ADCs) has been proposed. The technique is dedicated to imagers with massively parallel image acquisition working in the time mode where compensation of dark signal non-uniformity (DSNU) as well as photo-response non-uniformity (PRNU) is critical. Fixed pattern noise (FPN) reduction has been experimentally validated using 128-pixel CMOS imager. The reduction of the PRNU to about 0.5 LSB has been achieved. Linearity improvement technique has also been proposed, which allows for integral nonlinearity (INL) reduction to about 0.5 LSB. Measurements confirm the proposed approach.

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