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Sensors 2015, 15(9), 23496-23513; doi:10.3390/s150923496

A Fixed-Pattern Noise Correction Method Based on Gray Value Compensation for TDI CMOS Image Sensor

School of Electronic Information Engineering, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 27 July 2015 / Revised: 8 September 2015 / Accepted: 8 September 2015 / Published: 16 September 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4977 KB, uploaded 18 September 2015]   |  

Abstract

In order to eliminate the fixed-pattern noise (FPN) in the output image of time-delay-integration CMOS image sensor (TDI-CIS), a FPN correction method based on gray value compensation is proposed. One hundred images are first captured under uniform illumination. Then, row FPN (RFPN) and column FPN (CFPN) are estimated based on the row-mean vector and column-mean vector of all collected images, respectively. Finally, RFPN are corrected by adding the estimated RFPN gray value to the original gray values of pixels in the corresponding row, and CFPN are corrected by subtracting the estimated CFPN gray value from the original gray values of pixels in the corresponding column. Experimental results based on a 128-stage TDI-CIS show that, after correcting the FPN in the image captured under uniform illumination with the proposed method, the standard-deviation of row-mean vector decreases from 5.6798 to 0.4214 LSB, and the standard-deviation of column-mean vector decreases from 15.2080 to 13.4623 LSB. Both kinds of FPN in the real images captured by TDI-CIS are eliminated effectively with the proposed method. View Full-Text
Keywords: fixed-pattern noise (FPN); correction method; gray value compensation; CMOS image sensor (CIS); time-delay-integration (TDI) fixed-pattern noise (FPN); correction method; gray value compensation; CMOS image sensor (CIS); time-delay-integration (TDI)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, Z.; Xu, J.; Wang, X.; Nie, K.; Jin, W. A Fixed-Pattern Noise Correction Method Based on Gray Value Compensation for TDI CMOS Image Sensor. Sensors 2015, 15, 23496-23513.

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