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Imatest Documentation Display options contains settings that affect the display (units, appearance, etc.). MTF plots (individual and summary) selects the spatial frequency scale for MTF plots for for the summary plot. Cycles/pixel (C/P), Cycles/mm (lp/mm), Cycles/inch (lp/in), Line Widths per Picture Height (LW/PH), and Line Pairs per Picture Height (LP/PH) are the choices. (Note that one cycle is the same as one line pair or two line widths.) If you select Cycles per inch or Cycles/mm, you must enter a number for the pixel size— either in pixels per inch, pixels per mm, or microns per pixel. For more detail on pixel size, see the box below. Maximum MTF plot frequency selects the maximum display frequency for MTF plots. The default is 2x Nyquist (1 cycle/pixel). This works well for high quality digital cameras, not for imaging systems where the edge is spread over several pixels. In such cases, a lower maximum frequency produces a more readable plot. 1x Nyquist (0.5 cycle/pixel), 0.5x Nyquist (0.25 cycle/pixel), and 0.2x Nyquist (0.1 cycle/pixel) are available. Chart contrast For a medium or low contrast charts (contrast
Imatest Documentation Additional parameters (all optional) for Excel .CSV output contains a detailed description of the camera, lens, and test conditions. EXIF data is entered, if available, but can be overridden by manual settings. The Reset button clears all entries. When entries are complete, click OK to return control to the SFRplus settings & options window. When all entries are complete, click either Save settings , OK , or Cancel . Save settings saves the settings for use in automated SFRplus runs, which can be initiated from the SFRplus button in the main Imatest window. OK saves the settings then calculates results for interactive viewing. A sequence of Calculating... boxes appear to let you know how calculations are proceeding. When calculations are complete, results are displayed interactively in the Rescharts window, as shown below. Warnings A Clipping warning is issued if more than 0.5% of the pixels are clipped (saturated), i.e., if dark pixels reach level 0 or light pixels reach the maximum level (255 for bit depth = 8). This warning is emphasized if more than 5% of the pixels are clipped. Clipping reduces the accuracy of SFR results. It makes measured sharpness better than reality. The percentage of clipped pixels is not a reliable index of the severity of clipping or of the measurement error. For example, it is possible to just barely clip a large portion of the image with little loss of accuracy. The plot on the right illustrates relatively severe clipping, indicated by the sharp "shoulder" on the black line (the edge without standardized sharpening). The sharp corner makes the MTF look better than reality. The absence of a sharp corner may indicate that there is little MTF error. Clipping can usually be avoided with a correct exposure-- neither too dark Clipping warnings nor light. A low contrast target is recommended for reducing the likelihood of clipping: it increases exposure latitude and reduces the sensitivity of the MTF results to errors in estimating gamma. The following table lists figures and Excel-readable CSV files produced by Imatest SFRplus when the Save data button is pressed. Output files for filename.jpg (Y-channel) (default location: subfolder Results) Excel .CSV (ASCII text files that can be opened in Excel) SFR_cypx.csv SFR_lwph.csv filename_YA17_MTF.csv or filename_nn_MTF.csv (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 region (designated by location (YA17) or sequence (nn = 01,...). All channels (R, G, B, and Y (luminance) ) are displayed. filename_Y_multi.csv Excel .CSV file of summary results for a multiple ROI run. filename_Y_sfrbatch.csv Interpret the results Excel .CSF file combining the results of batch runs (several files) with multiple ROIs. Only for automatic SFRplus (not Rescharts). Used as input to Batchview. Sharpness is the most important (but not the only) lens measurement. To learn more about sharpness measurements, see Sharpness: What is it and how is it measured?, SFR Tour, and SFR Results: MTF (Sharpness) plot. Remember, in evaluating lenses, use the results without standardized sharpening. You should uncheck the Standardized sharpening box. Results with standardized sharpening do, however, have some interest: they indicate what can be achieved after sharpening. But they tend to "flatten" differences between lenses. The illustration below shows the Rescharts SFRplus window with the Edge and MTF plots for a region near the center. (Any region may be selected.) MTF50 (the spatial frequency where MTF drops to half its low frequency value) or MTF50P (the spatial frequency where MTF drops to half its peak value) are the most valuable results for lens testing: they correlate better with perceived image sharpness than any other measurements. They have the same value except when heavy sharpening is applied, in which case MTF50P is a little lower, and also more representative of the system. In general, heavy sharpening should be avoided 243 of 451
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