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Imatest Documentation To turn off the probe, click outside the image (in the current version, you need to ckickon the text below the image. This should be fixed in a future version.) When the Probe is off the mean and maximum values of ∆E*ab, ∆C*ab, ∆E*94, ∆C*94, ∆E*00 and ∆C*00 are displayed. 3D Plots (Master-only) Three-dimensional display of the results selected by Plot options, shown on the right . The display can be rotated for enhanced visualization. Region selection should include at least 13 regions. A 5x5 grid (23 regions) was chosen for the analysis on the right because it's the largest grid that avoids the low contrast edges, which tend to have lower MTFs in typical consumer/DSLR cameras with nonlinear signal processing. Single-contrast charts (without the low contrast regions) are often the best choice for 3D plots (for example, in equipment reviews). The rather strangely shaped surface (center has lower MTF than part way region) may be the result of autofocus issues. Several Display options are available. The Pseudocolor shaded plot with image and text shown on the right is the most generally useful. Other options include no shading, colored contour lines-only, and 3D plots only (displayed larger, but without the summary image and text shown below the 3D plot). Display area. Details on right The Z-axis of the image (which contains the results) can be inverted to reveal detail obscured in a normal display. The background color can be varied from white to black using the Backgnd slider. The default is light gray (0.9). Manual or automatic scaling may be selected using the Scaling button. Automatic is the default. When Scaling is pressed, the Manual scaling Split view, showing Probe results MTF50 3D plot Plot options Display options 180 of 451
Imatest Documentation window, shown on the right, lets you set the scaling for the parameter selected in the Plot menu (MTF50P in this case). Minimum and Maximum only apply for manual scaling, i.e., when Auto scaling is unchecked. 6, 11, 16, 21, or 26 contour lines may be selected. The Top button sets a top (pseudo-2D) view. It toggles between Top and Default . You can rotate the image starting from either setting. 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 Scaling window 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). The lines are calculated using third-order polynomial regression. With higher-order regression the lines displayed irregularities caused by scatter due to lens decentering (visible in the 3D plots)— a limitation of real-world lenses, which are rarely perfectly centered in practice, unlike the ideal (or "cherry-picked") lenses on manufacturer's web pages. SFRplus summary SFRplus analyzes images of the SFRplus test chart, framed so that there is white space above and below the horizontal bars in the chart, i.e., the bars must not run off the top or bottom of the image. They may, however, run off the sides of the image. The white space should be between 0.5% and 25% of the image height. There should be few or no interfering patterns (bars, etc.) outside the image of the chart itself. Lighting should be even and glare-free. Lighting and alignment recommendations are given in Building a test lab. The first time SFRplus is run, it should be run through Rescharts. This allows parameters to be adjusted and saved for later use in the automatic version of SFRplus, which is opened with the 181 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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