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Imatest Documentation Multi-Region summary plot, showing Center-corner distances, MTF50, MTF20, and Chromatic Aberration (in center-corner %) superimposed on image. Distortion measurements (SMIA TV Distortion, etc.) are shown on the lower-left. With This display you can quickly scan the summary results, then look at the detailed results for the individual region. The legend explains the four results boxes next to each ROI. The boxes contain (1) The ROI number (N) and the center-to-corner distance expressed in %, (2) MTF50 in either cycles/pixels or LW/PH, in boldface for emphasis, (3) MTF20, and (4) Chromatic Aberration (area as % of center-to-corner distance). 3D display (shown on right) provides the most visual detail of the results. Several options are available: a multi-region summary may be shown between the 3D plot. This display is particularly useful for locating decentering or other irregularities in the system response. MTF50 is shown, but a great many parameters may be displayed with the 3D plot. More details here. The region selection was 13. All squares, inner & bdry except low contrast (good 3D map). SQF— Subjective Quality Factor (not shown on this page) is the best measurement of perceived print sharpness because it includes the contrast sensitivity of the human visual system, print size, and estimated viewing distance, in addition to MTF. Its importance will grow as it becomes more familiar. SQF is strongly affected by sharpening. 246 of 451
Imatest Documentation Lens-style MTF plot (Introduced in Imatest 3.5.2) This plot was designed to produce similar results to MTF plots in the Canon (explanation), Nikon (explanation), and Zeiss websites. Plot parameters are selected by the Secondary readout: up to 3 may be selected. Typical values are 10, 20, and 40 lp/mm (used by Zeiss) or 10 and 30 lp/mm (used by Canon and Nikon). A minimum of 13 regions is required. Recommended region selections are 10. All squares, inner & boundary edges (best 3D map) (for single-tone charts) or 13. All squares, inner & bdry except low contrast (good 3D map) (for two-tone charts). V&H edges (both) should be selected. Though these plots are similar to the website plots, there are several significant differences. Imatest calculates he system MTF, including the sensor and signalprocessing. The websites display the optically-measured MTF for the lens-only. If you recognize this difference, the two sets of curves are comparable (but never identical). The horizontal (H) MTF curves, derived from vertical edges, are mostly radial (sagittal) near the edges (at large distances from the image center). The SFRplus chart was designed for this purpose. The Vertical (V) MTF curves, derived from horizontal edges, are mostly tangential (meridional) near the edges. Lens-style MTF plot The published curves assume perfect centering. Some manufacturers, like Canon, obtain their results from design calculations, not from measured test results (no centering issues!). Real lenses almost always exhibit some decentering, primarily due to manufacturing, which is more visible in other displays, particularly the 3D plots. In the lens-style MTF plot, decentering shows up as a spread in the individual readings (x for Horizontal MTF from vertical edges, • for Vertical MTF from horizontal edges). Combining runs in batches Once parameters have been set and saved in Rescharts SFRplus, you can run the fully automated version of SFRplus by pressing the SFRplus button in the Imatest main window. If you select a batches of files (instead of a single file), an output file with a name of the form input_filename_chan_sfrbatch.csv will be created for the Batchview program, which allows combined results to be viewed. Here is an example for six files with different apertures (f/4.5-f/22). 247 of 451
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Imatest Documentation Using SFRplus
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