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Imatest Documentation SFRplus results in Rescharts window: Multiple region (ROI) summary The multi-ROI (Region of Interest) summary shown in the Rescharts window (above) contains a detailed summary of SFRplus results. (The 3D plots also contain an excellent summary.) It is similar to the SFR Multiple ROI plot. The upper left contains the image in muted gray tones. The selected regions are surrounded by red rectangles and displayed with full contrast. Four results boxes are displayed next to each region. The results depend on the Old/New selection in the Display options area on the right. There is a legend below the image. The table below explains the contents in more detail. N: Ctr-corner distance % MTF50 LW/PH or cycles/pxl MTF20 LW/PH or cycles/pxl Chrom Aberration (pxl area) Distortion statistics are shown in the lower left. Old: MTF50, MTF50, CA New: MTF50, 2ndary readouts Region number (N) and distance from the center as a percentage of center-to-corner distance MTF50 in units specified in the MTF plots entry in Display options in the SFRplus settings and options window. MTF20 in the same units as MTF50. May be replaced by the secondary readout in an upcoming release. Chromatic Aberration in pixel area. % of center-to-corner distance may be an option in a future release. See Chromatic Aberration and Chromatic Aberration ... plots. (same) (same) First Secondary Readout Second Secondary Readout SMIA TV distortion is the simplest overall measure of distortion. it is positive for pincushion distortion and negative for barrel distortion. k1 (the third order distortion coefficient). ru = rd + k1 rd 3 = where ru is the undistorted radius and rd is the distorted radius. r is normalized to the center-to-corner distance. k1 > 0 for barrel distortion and k1 < 0 for pincushion. h1 and h2 (fifth order distortion coefficients). ru = rd + h1 rd 3 + h2 rd 5 A relatively large value of h2 with a different sign from h1 may indicate "wave" or "moustache" distortion, where the predominant distortion goes from barrel to pincushion (or vice-versa) as radius increases. The Picture Window Pro arctangent/tangent coefficients are also calculated and included in the CSV output file. All of these measurements are discussed on the page on Distortion. 174 of 451
Imatest Documentation Weighted MTF50 results are displayed on the upper-right. The weighted sum has weights of 1.0 for ROIs in the central region (inside the inner dotted circle), 0.75 for the middle region (between the two dotted circles), and 0.25 for the outer region (outside the outer dotted circle). The results are independent of the number of ROIs in each region. Plot settings area A small number of options are available in the Plot settings area, on the lower right, below the Display box (fewer than for other Rescharts modules). All displays contain the dropdown menu for selecting the primary channel to analyze. If R, G, B, or Y (Luminance) is selected, all channels are analyzed, but the selected channel is emphasized. There is also an option to analyze any of the channels alone— useful where one of the secondary channels is dark and may cause a run to crash. Luminance (Y) is shown above. If it is changed, results are recalculated. All displays except Multi-ROI summary and Tonal response & gamma allow you to select the ROI for viewing results. The Edge and MTF display has a dropdown window for selecting the maximum MTF display frequency: 2x Nyquist (the default), Nyquist, 0.5x Nyquist, and 0.2x Nyquist. Edge and MTF display Edge and MTF display in Rescharts window This display is identical to the SFR Edge and MTF display. MTF is explained in Sharpness: What is it and how is it measured? The edge (or line spread function) is plotted on the top and the MTF is plotted on the bottom. There are a number of readouts, including 10-90% rise distance, MTF50, MTF50P (the spatial frequency where MTF is 50% of the peak value; differing from MTF50 only for oversharpened pulses), the secondary readout (MTF20 in this case), and the MTF at the Nyquist frequency (0.5 cycles/pixel). An important (and optional) readout in the upper plot is The Chart contrast (entered in the Display options section of the SFRplus settings & options window), The Contrast factor: the ratio between the chart contrast derived from the pixel ratio and the input value of gamma (0.5 in the 175 of 451
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