Method for the measurement of the modulation transfer function of sampled imaging systems from bar-target patterns

Area of Science:

• Optics and Imaging Science
• Signal Processing
• Metrology

Background:

• Accurate characterization of imaging system performance is crucial for scientific and industrial applications.
• The modulation transfer function (MTF) is a key metric for evaluating image quality and spatial resolution.
• Existing methods for MTF determination can be complex or prone to errors, particularly in sampled systems.

Purpose of the Study:

• To present a rigorous and simple method for determining the modulation transfer function (MTF) of sampled imaging systems.
• To derive an optimal set of bar pattern frequencies that minimize errors caused by aliased frequency components.
• To validate the proposed method with both theoretical and experimental data.

Main Methods:

• Imaging standard bar patterns with varying spatial frequencies using the system under test.
• Calculating the MTF by measuring the amplitude reduction of the fundamental frequency components in the system's output.
• Deriving a set of optimal bar pattern frequencies to mitigate aliasing artifacts.

Main Results:

• The proposed method provides a straightforward approach to MTF determination.
• The derived optimal frequencies effectively reduce errors from aliased frequency components.
• Both theoretical calculations and experimental results demonstrate the accuracy and reliability of the method.

Conclusions:

• The presented method offers a practical and accurate solution for MTF measurement in sampled imaging systems.
• The optimization of bar pattern frequencies enhances the reliability of MTF analysis.
• This technique is valuable for quality control and performance evaluation of imaging devices.