SPP plot (short for Sampling Periodicity Plot) is a plot showing the result to apply the Fourier Transform Function to the series of the maximum values of the LSF used in the MTF calculations the plot is a valuable indicator of periodicity sampling reliableness performed by the system because of the slanted position of the edge related with the sensor grid. ESF, LSF and MTF plots are calculated and traced as described in the MTF bibliography. The plugin performs system MTF calculations up to twice the Nyquist frequency over slanted vertical edge images with dark side at left if the picture is taken from a horizontal slanted edge, the image must be rotated 90 degrees before running the plugin.Īt the same time, the plugin run the calculations and shows as a result four plots labeled with the SPP_, ESF_, LSF_ and MTF_ prefixes respectively followed by the file name. The ImageJ plugin SE_MTF (short for Slanted Edge Modulation Transfer Function) has been developed by Carles Mitja, Jaume Escofet, Aura Tacho and Raquel Revuelta at the Image Quality Laboratory (LQI, short for Laboratori de Qualitat de la Imatge) in the Center of the Image and the Multimedia Technology (CITM, short for Centre de la Imatge I la Tecnologia Multimedia) from the Polytechnic University of Catalonia (UPC, Spain). Carles Mitja Jaume Escofet, Aura Tacho and Raquel Revuelta.ĭownload SE_MTF_2xNyquist.jar into the plugins folder, and then restart ImageJ.
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