(24 and 16 cycles are new in Imatest 5.0, but are not recommended for most applications.
We’ve made several enhancements in Imatest 5.0.Ĭharts with 144, 72, 48, 36, 24, and 16 cycles can be analyzed in 8, 16, or 24 segments around the circle. But we strongly support the Siemens Star, which provides information on angular MTF response and is the only pattern other than the slanted-edge that can reliably analyze MTF response above the Nyquist frequency. For most purposes we recommend the slanted-edge, which provides accurate reliable measurements, runs fast, and can produce highly detailed maps of sharpness over the image surface. Sinusoidally-modulated stars are preferred, but bar (square wave-modulated) Siemens stars can also be analyzed for MTF, with appropriate normalization settings.Ī detailed comparison of Siemens Star and slanted-edge MTF results is presented in Slanted-edge versus Siemens Star – A comparison of sensitivity to signal processing. Star Chart, which can be run in the interactive Rescharts interface or as a fixed (batch-capable) module, measures SFR (Spatial Frequency Response) also known as MTF (Modulation Transfer Function) from Siemens star charts, which are included the ISO 12233:2014 standard. Introduction – Creating, photographing, running – Output – MTF – MTFnn, MTFnnP
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