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Imatest Documentation This plot above compares the results of two SFR runs for the same lens and focal length at two different apertures (f/2.8 and f/8) using the same high contrast edge above the center of the Applied Image QA-77 test chart. The SFR run for f/8 (B, above) is shown greatly reduced on the right. The A/B transfer function (MTF(A)/MTF(B)) is shown as a solid bold black line —— up to the lowest frequency where the denominator (MTF(B)) drops below 0.04. Results above this frequency are unreliable due to noise; hence they are shown as a dashed thin gray line - - - -. In the MTF Compare figure (above) the input file names (csv files saved from SFR runs) are shown in the A. and B. boxes below the plot. The corresponding image file names are shown above the plot. The A and B Nyquist frequencies are shown as short, faint brown and blue lines. Important input data is summarized on the right. Since the input to MTF Compare is saved SFR output, and since no Imatest output can be saved in evaluation mode, MTF Compare is not practical for running in evaluation mode. Instructions Getting started MTF Compare is a post-processor for Imatest SFR and Rescharts Slanted-edge SFR that uses SFR's Excel-readable CSV output files. In order to compare MTFs, these CSV output files must be saved in SFR runs. To do so, make sure Excel .CSV detailed results is checked in the SFR Save dialog box, shown on the right. You may, if you wish, change the Results directory and root file name from their defaults to make them easier to identify and retrieve. Then press Yes on the bottom. The illustration below is similar to the one near the top of the page, except that it is based on the low-contrast edge closer to the center of the image of the QA-77 chart, which has much less in-camera sharpening than the high-contrast edge and the maximum display frequency is 0.5 cycles/pixel. The EOS-20D, like most digital cameras, has significant nonlinear signal processing, i.e., strong sharpening takes place in the vicinity of high contrast features, but little, if any, sharpening takes place in their absence— i.e., sharpening is not applied uniformly throughout the image. But even though the MTFs are much lower than the MTFs of the contrasty edge, the A/B ratio (transfer function) is comparable for spatial frequencies below 0.4 cycles/pixel. Results at higher frequencies (shown as faint dashed lines) are dominated by noise and hence are meaningless. 220 of 451
Imatest Documentation MTF Compare results showing (f/2.8)/(f/8) transfer function To run MTF Compare (Imatest Master only), press MTF Compare in the upper right of the Imatest Main Window, just below SFR: Current file , which is often grayed out. CSV input files are selected by pressing the down arrows on the right of the A and B boxes on the lower left and selecting either Browse... or Recent files, which opens a box containing up to 12 recently used files. The selected files must be CSV output files generated by Imatest SFR. When both A and B contain valid data, a plot appears, using the saved Display and Scale selections. Display options Display controls what is displayed, i.e., the y-axis. A/B Transfer function MTF(A)/MTF(B) is displayed a bold solid black line —— up to the lowest frequency where the denominator (MTF(B)) drops below 0.04, and as a thin dashed gray line - - - - at higher frequencies, where noise makes results unreliable. MTF(A) is displayed as a faint brown line ——, and MTF(B) is displayed as a faint blue line ——. B/A Transfer function Similar to A/B, except that MTF(B)/MTF(A) is displayed. A strong, B faint MTF(A) is displayed as a strong brown line —— ; MTF(B) is displayed as a faint blue line ——. B strong, A faint MTF(B) is displayed as a strong blue line —— ; MTF(A) is displayed as a faint brown line ——. Summary and EXIF data displays a summary of the results and EXIF data (available in JPEG files). A portion of this display is shown on the right. Scale controls the scaling of the display, i.e., the x-axis. Cycles/pixel A maximum of 1 is always displayed. Line Widths/Picture Height (LW/PH) The maximum value displayed is the lower of the maximum values for A and B. Care must be used in interpreting results because sensors have widely varying heights (measured in number of pixels). Cycles/mm Pixel spacing (microns per pixel, pixels per mm, or pixels per inch) must be entered in the SFR input dialog box for 221 of 451
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Imatest Documentation © 2009 Imate
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