MTFCalculator – A Mobile Application for Measuring the Modulation Transfer Function of Built-in Cameras of Smartphones Using ISO 12233 Slanted-Edge Method

Asnani, Sorath; Presti, Fabrizio Lo; Amato, Luigi Santamaria; Montrucchio, Bartolomeo

doi:10.1109/icsip52628.2021.9688610

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…The ESF can be viewed as the integral of the LSF, establishing a relationship between differentiation and integration, as illustrated in Equation (4). Furthermore, the onedimensional Fourier transform of the LSF corresponds to the MTF for that specific direction [32], forming the theoretical foundation of the slanted-edge method used in MTF calculation.…”

Section: Measurement Principles and Methodsmentioning

confidence: 99%

Analysis of the Slanted-Edge Measurement Method for the Modulation Transfer Function of Remote Sensing Cameras

Yu,

Zhang,

et al. 2023

Applied Sciences

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The modulation transfer function (MTF) serves as a crucial technical index for assessing the imaging quality of remote sensing cameras, which is integral throughout their entire operational cycle. Currently, the MTF evaluation of remote sensing cameras primarily relies on the slanted-edge method. The factors influencing the slanted-edge method’s effectiveness are broadly classified into two categories: algorithmic factors and image factors. This paper innovatively comprehensively analyzes the influencing factors of the slanted-edge method and proposes an improved slanted-edge method to calculate the MTF testing method of remote sensing cameras, which is applied to the MTF testing of remote sensing cameras. Since the traditional algorithm can only be applied in the small angle situation, this paper proposes a new method of slanted-edge method test calculation based on the optimal oversampling rate (OSR) adaptive model of the slanted edge and uses simulation experiments to verify the reliability of the algorithm model through the deviation of the slanted-edge angle calculation and MTF measurement, and the results show that the algorithm improves the accuracy of the MTF measurement compared with the ISO-cos and OMINI-sine methods. Then, the effects of the slanted-edge angle, image region of interest (ROI), as well as image contrast and signal-to-noise ratio (SNR) on the accuracy of the MTF calculation by the slanted-edge method were quantitatively analyzed as the constraints of the slanted-edge method test. Based on the laboratory target experiment, the algorithm flow and various influencing factors obtained in the simulation stage are verified, and the experimental results are more consistent with the various test results obtained in the simulation stage. Consequently, the slanted-edge method introduced in this paper is applicable for future remote sensing camera MTF testing. This approach offers a valuable reference for on-orbit focusing, satellite operational condition monitoring, lifespan estimation, and image restoration.

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Section: Measurement Principles and Methodsmentioning

confidence: 99%

Analysis of the Slanted-Edge Measurement Method for the Modulation Transfer Function of Remote Sensing Cameras

Yu,

Zhang,

et al. 2023

Applied Sciences

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“…Using the Imatest SFR method [3] and select the slanted-edge (light-to-dark) target to test the MTF of the camera system including camera body and lens [4] . The paper shoots slanted edges in each position, taking the central pattern as an example [5] .…”

Section: Mtfmentioning

confidence: 99%

Imaging quality evaluation and testing process design of ultra-HD cameras

Yuqing

Ye²

2023

AOPC 2022: Optical Sensing, Imaging, and Display Technology

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As far as resolution is concerned, a system with pixels exceeding 4K (3980*2040) or 8K (7680*4320) is called Ultra HD. In this paper, to fill the gap in UHD testing and evaluation, we take a full frame 8K HDR camera equipped with a zoom lens as an example, evaluating the system performance by a comprehensive test. Next, according to the results, a new testing process including three indicators with corresponding criteria is designed to make a supplement to BT.2020 criterion and offers an integrated test for 8K camera lenses.

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MTFCalculator – A Mobile Application for Measuring the Modulation Transfer Function of Built-in Cameras of Smartphones Using ISO 12233 Slanted-Edge Method

Cited by 2 publications

References 16 publications

Analysis of the Slanted-Edge Measurement Method for the Modulation Transfer Function of Remote Sensing Cameras

Analysis of the Slanted-Edge Measurement Method for the Modulation Transfer Function of Remote Sensing Cameras

Imaging quality evaluation and testing process design of ultra-HD cameras

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