An improved slanted-edge method for measuring modulation transfer function based on edge-preserving filter

Saisai Nie; Xiukai Ruan; Guihua Cui; Weikuan Lu

doi:10.1117/12.2680433

27 June 2023 An improved slanted-edge method for measuring modulation transfer function based on edge-preserving filter

Saisai Nie, Xiukai Ruan, Guihua Cui, Weikuan Lu

Proceedings Volume 12705, Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022); 1270512 (2023) https://doi.org/10.1117/12.2680433
Event: Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022), 2022, Nanjing, China

Abstract

ISO 12233 provides a method for measuring Modulation Transfer Function (MTF) of digital input devices based on a slanted-edge method. However, the results measured by the method are greatly affected by image processing procedures, especially sharpening, and false MTF is often given. In this article, an improved slanted-edge method is proposed where an edge-preserving filter with optimal parameters is introduced to smooth the image before implementing ISO 12233 method. Particularly, three edge-preserving filters, bilateral filter, guided filter and adaptive weighted least square filter, and one general filter, Gaussian filter, are compared in mitigating the effect of sharpening algorithm on the measurement of digital camera MTF. The experimental results indicate that the effect of sharpening algorithm on the measured MTF can be effectively reduced by using an edge-preserving filter, and significantly improvement on the MTF accuracy at Nyquist frequency is achieved. Especially, the slanted-edge method based on the guided filter and the weighted least squares filter can give more real MTF for a digital camera.

Citation Download Citation

Saisai Nie, Xiukai Ruan, Guihua Cui, and Weikuan Lu "An improved slanted-edge method for measuring modulation transfer function based on edge-preserving filter", Proc. SPIE 12705, Fourteenth International Conference on Graphics and Image Processing (ICGIP 2022), 1270512 (27 June 2023); https://doi.org/10.1117/12.2680433

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