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Imatest Documentation maximized, and closed at will. Their contents are described in MTF (Sharpness) plot, Chromatic Aberration, Noise, and Shannon Capacity plot, and Multiple ROI (Region of Interest) plot. Two precautions when working with figures Too many open Figures Figures can proliferate if you do a number of runs, especially SFR runs with multiple regions, and system performance suffers if too many Figures are open. You will need to manage them. Figures can be closed individually by clicking X on the upper right of the Figure or by any of the usual Windows techniques. You can close them all by clicking Close figures in the Imatest main window. Save the results At the completion of the SFR calculations the Save SFR results? dialog box appears (unless Express mode has been selected). It allows you to choose which results to save and where to save them. Selections are saved for future runs. The default is subdirectory Results of the data file directory. You can change to another existing directory, but new results directories must first be created outside of Imatest using a utility such as Windows Explorer. (This is a limitation of this version of Matlab.) Figures, CSV, and XML data are saved in files whose names consist of a root file name with a suffix and extension. The root file name defaults to the image file name, but can be changed using the Results root file name box. Be sure to press enter. When multiple ROIs are selected, the Save results? dialog box appears only after the first set of calculations. The remaining calculations use the same Save settings. The first four checkboxes are for the figures. 5-7 are for Excel .CSV results. 8 is for XML output. You can examine the output figures before you check or uncheck the boxes. Checking Close figures after save closes figures after they are saved. This can be useful for large batch runs (Imatest Master only), where too many open figures will degrade the performance of most computers. Details of the output files can be found here. The following table lists figures and Excel-readable CSV files produced by Imatest SFR. Clicking on Figures during calculations can confuse Matlab. Plots can appear on the wrong figure (usually distorted) or disappear altogether. Wait until all calculations are complete— until the Save or Imatest main window appears— before clicking on any Figures. SFR Save dialog box. 260 of 451
Imatest Documentation Figures (.PNG image files) filename_YA17_cpp.png Output files for filename.jpg (Y-channel) (default location: subfolder Results) Plot with x-axis in cycles/pixel (c/p), Y-channel,17% of the way to the corner above the center of the uncropped image. filename_YA17_lwph.png Plot with x-axis in Line Widths per Picture Height (LW/PH). filename_YA17_ca.png Plot of Chromatic Aberration, with noise statistics and Shannon information capacity. Excel .CSV (ASCII text files that can be opened in Excel) SFR_cypx.csv SFR_LWPH.csv filename_YA17_MTF.csv CSV output files are explained in detail below. Click link for detail on individual file. (Database file for appending results: name does not change). Displays 10-90% rise in pixels and MTF in cycles/pixel (C/P). (Database file for appending results: name does not change). Displays 10-90% rise in number/Picture Height (/PH) and MTF in Line Widths per Picture Height (LW/PH). Excel .CSV file of MTF results for this run. All channels (R, G, B, and Y (luminance) ) are displayed.The first row has the headers: cy/pxl, LW/PH, MTF(nchan), MTF(corr), MTF(R), MTF(G), MTF(B), MTF(Y), where nchan is the selected channel. The remaining lines contain the data. Can easily be plotted or combined with data from other files. filename_Y_multi.csv Excel .CSV file of summary results for a multiple ROI run. filename_Y_sfrbatch.csv Excel .CSF file combining the results of batch runs (several files) with multiple ROIs. Particularly useful for generating easily-readable Excel plots. 261 of 451
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