Calibration of Imaging Sensor and Fiber Optic Taper-Caused Distortion in an X-Ray Intensified CMOS Camera

Calibration of Imaging Sensor and Fiber Optic Taper-Caused Distortion in an X-Ray Intensified CMOS Camera

Citation

The specific journal where the article "Calibration of Imaging Sensor and Fiber Optic Taper-Caused Distortion in an X-Ray Intensified CMOS Camera" was published is not provided. However, the article was assigned the Digital Object Identifier 10.1109/ACCESS.2019.2960259 on December 17, 2019.

Keywords

  • Distortion correction
  • X-ray image sensor
  • CMOS
  • Fiber optic taper
  • RANSAC

Brief

The article presents a method for calibrating imaging sensors and correcting distortions caused by fiber optic tapers in X-ray intensified CMOS cameras.

Summary

The article presents a calibration method for an X-ray intensified CMOS camera used to capture images in applications such as medical diagnoses, industrial inspections, and nuclear security surveillance. The method involves correcting distortions from the CMOS sensor and fiber optic taper, including column noise, inconsistent and nonlinear pixel intensity response, and geometry distortion.

Calibration Method:

  • Column Noise Correction: Capture multiple images in a dark field under the same exposure time. An average of these images is used to estimate a standard column noise image. This process is repeated multiple times, and the results are processed to determine the column noise estimation formula.
  • Pixel Intensity Response Correction: A two-step technique is used. First, an ideal intensity response line is computed for all pixels. Then, the correction error for each pixel is estimated and compensated using a polynomial function.
  • Geometry Distortion Correction: Polynomial fitting, assisted by the RANdom SAmple Consensus (RANSAC) method, is used to rectify geometry distortion.

The calibration method considers the optical properties of the fiber optic taper and camera to select key parameters, aiming to improve calibration precision and efficiency. The article includes experimental results and discussion about the method's effectiveness and limitations.

The provided text does not explicitly name the journal where this article was published.

Origin: https://ieeexplore.ieee.org/ielx7/6287639/8600701/08935227.pdf

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