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Imatest Documentation when testing lenses. Signal processing (which includes sharpening) should be as consistent as possible. MTF is preferred over edge response parameters (such as the 10-90% rise distance) because system MTF is the product of the MTF of individual components. No such simple formula is available for edge responses. MTF can be displayed in a number of different ways (in detail for a single region or a map of the whole image surface). Additional output parameters, for example MTF at a specified spatial frequency, can be displayed using the Secondary readout. Imatest Rescharts window showing Edge and MTF plot for a single region (near the center) The Rescharts window has some common features for all displays. Zoom turns zoom on and off. For 3D plots it toggles a rotate function. The Whole image or a Crop may be displayed on the upper right. Read image file reads a file of the type specified by Chart type below. Changing the type reads another file. New analysis (same image) lets you reanalyze the same image with the same or different Rescharts module. Imate settings and options opens the Settings window, described above. Display lets you select the display. Several are of interest for lens testing, including 1. Edge and MTF, 2. Chromatic Aberration, 3. SQF, 4. Multi-ROI summary, 12. 3D plots, and 13. Lens style MTF plot. Several will be shown below. The options area below the Display region depends on the Display setting. Details in Using SFRplus Part 3. Save screen saves and optionally displays the Rescharts window. Save data saves several results in CSV and XML files, shown below. Rescharts control area 244 of 451
Imatest Documentation 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 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. Chromatic aberration is best measured on tangential (i.e., vertical) edges near the corners. The plot shows the three channels. A key result is CA (area), which is equal to the area between the highest and lowest value (works because the x-axis is pixels and the y-axis is normalized). It is most valuable as percentage of the distance from the center to the corner. Interpretation: under 0.04; insignificant. 0.04-0.08: minor; 0.08-0.15: moderate; over 0.15: serious. Another useful result is CA (crossing), the maximum difference between center of the edges (where 0.5 is crossed). This is more closely related to lens performance, whereas the area is more closely related to perceptual color fringing (and it strongly affected by the demosaicing algorithm). For more information, see Chromatic Aberration and SFR Results: Chromatic Aberration ... plot. Multiple regions If you selected multiple regions of interest (ROIs) you can select the multi-ROI summary, shown below for 13 regions (center, corners, part-way to corners, left, right, top, and bottom). This plot can get clutterred if too many regions are selected. 245 of 451
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Imatest Documentation © 2009 Imate
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