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Published on: February 27, 2019
Liquid-crystal-display projector-based modulation transfer function measurements of charge-coupled-device video
1The Erik Jonsson School of Engineering and Computer Science, The University of Texas at Dallas, Richardson, Texas 75083, USA.
Applied Optics
|March 14, 2008
Summary
This study presents a novel method for measuring the modulation transfer function (MTF) of video camera systems using a liquid-crystal-display (LCD) projector. This technique offers a convenient and low-cost approach for characterizing camera performance in machine vision and metrology.
Area of Science:
- Optical Engineering
- Image Processing
- Metrology
Background:
- Accurate characterization of video camera systems is crucial for machine vision and metrology.
- Traditional methods for measuring modulation transfer function (MTF) can be complex and costly.
- Liquid-crystal-display (LCD) projectors offer a flexible platform for generating test patterns.
Purpose of the Study:
- To demonstrate a convenient and low-cost method for measuring the system modulation transfer function (MTF) of charge-coupled-device (CCD) video camera systems.
- To evaluate the effectiveness of different test matrices for MTF measurement using an LCD projector.
- To assess the impact of shift-variant effects between LCD and CCD arrays.
Main Methods:
- Utilized an LCD projector to display various test matrices, including random-number generator, sequency-ordered Walsh functions, pseudorandom Hadamard, and uniformly redundant arrays.
- Measured the system MTF of both color and monochrome CCD video camera systems.
- Analyzed the power spectral density (PSD) of the displayed test matrices.
- Quantified shift-variant effects between the LCD and CCD arrays.
Main Results:
- All tested matrices showed agreement with expected filtering, with Walsh and Hadamard matrices demonstrating excellent correlation with the random-number generator matrix.
- Shift-variant effects between the LCD and CCD arrays were found to be minimal.
- The LCD projector method provided convenient MTF measurements for low-cost video systems.
Conclusions:
- The proposed LCD projector-based method is a viable and cost-effective approach for measuring the MTF of CCD video camera systems.
- This technique is well-suited for applications in machine vision and metrology where system characterization is essential.
- The use of specific test matrices, like Walsh and Hadamard, enhances the accuracy and reliability of the MTF measurements.
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