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Imatest Documentation Pattern (original and linearized) MTF & Moire (Linear frequency scale) MTF & Moire (log frequency scale) Show pattern: normalized pixel levels (max contrast) on top; linearized (max contrast and selected row) on bottom Display MTF for several contrast levels (rows 1-22 in steps of 3, where the chart is divided into 25 rows for analysis) with a linear frequency scale. Display MTF for several contrast levels (rows 1-22 in steps of 3) with a log frequency scale. A thumbnail of the pattern is also displayed on the same scale. EXIF data Show EXIF data if available. In addition to the displays, two buttons allow you to save results. Save screen Saves an image of the Starchart window as a PNG file. If you check Display screen in the Save screen dialog box, the image will be opened in the editor/viewer of your choice. (Irfanview works well, and it's free.) Save data Saves detailed results in a CSV file that can be opened by Excel and also in an XML file. The spatial frequency is automatically calculated from the image, under the assumption that log frequency increases linearly with distance. Pattern (original and linearized) Pattern: original and linearized The entire Rescharts window is shown. The upper plot is the normalized pixel level (pixel level/255 for bit depth of 8). The lower plot is the linearized levels. MTF 198 of 451
Imatest Documentation The display on the right shows MTF on a logarithmic frequency scale. A vertically squeezed version of the image with exaggerated color (chroma) is shown just above the plot. The dark line had been strongly smoothed. The pale dashed lines are the unsmoothed results: the fine detail is a calculation artifact caused by phase variations and noise; it is not significant. The lower plot shows color moiré (in Imatest Master only) , which is discussed above. The selected moiré measurement is the Red-Blue channel (R-B). Options that affect this plot include Moire (the moiré measurement) and Correct for color density (which is normally checked). The printed results beneath the plot shows the image dimensions and crop locations, MTFnn and MTFnnP (the spatial frequencies where response falls to nn% of the low frequency and peak values, respectively) for nn = 50, 20, and 10%, and The total moiré spread, which is the maximum - minimum value of the selected moiré measurement (in this case, R-B). The display on the right shows the same MTF results plotted on a linear frequency scale with a maximum spatial frequency of 1 cycle/pixel. (Color moiré has been omitted.) The maximum display frequency, the display scale (cycles/pixel, cycles/mm, cycles/in, or LW/PH (Line Widths per Picture Height, where 2 Line Widths = 1 cycle or line pair)), and gamma can be set to any of several options by pressing the Image settings & options button. Comparison with other measurements An obvious question is, how do Log Frequency results compare with Slanted-edge SFR (identical to the standard SFR module)? The comparison is easy to make because the test target contains low and high contrast slanted-edge charts as well as Log Frequency-Contrast charts. Some divergence is expected because of nonlinear signal processing, which is widespread in digital cameras: most digital cameras, especially compacts, process the signal differently in the presence or absence of contrasty edges. In the presence of a contrasty edge the image is sharpened: high spatial frequencies are boosted. In the absence of a contrasty edge noise reduction is applied, i.e., the image is blurred; high spatial frequencies are attenuated. Since the Log Frequency pattern doesn't resemble an edge it's difficult to predict exactly how the different methods will compare. But we have a clue from Log F-Contrast. The MTFnn values for the EOS-20D at ISO 100 (shown on the right) change relatively little with chart contrast, in strong distinction to the compact Panasonic TZ1, especially at ISO 800, which shows considerable nonlinear processing. MTF: Log frequency scale MTF: Linear frequency scale MTFnn from Log F-Contrast: shows little change with chart contrast 199 of 451
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