KEYWORDS: Modulation transfer functions, Composites, Signal to noise ratio, Point spread functions, Optical filters, Digital filtering, Linear filtering, Error analysis, Imaging systems
The MTF test always suffered from the noises. Unfortunately, it was very difficult to eliminate the co-frequency noise, when the noise located in the sampling frequency region. Based on the previous research on the multi column realignment averaging method, a novel composite processing method was proposed to remove the noises, without losing valid information. By establishing an accurate mathematical model and benchmark, and comparing with each other under the different conditions, the composite processing method can hold the valid information and suppress noise well. The error of this method was less than 0.04, when the signal-to-noise ratio of the slanted slit image was only 10 dB. It was believed that this method would be further improved in the accuracy and robustness.
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