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Imatest Documentation SFR results: Multiple ROI (Region of Interest) plot Imatest SFR allows you to select several regions of interest (ROIs) in an image. Display options from the SFR input dialog box are shown below. When one of the Multi-ROI plots (1D or 2D; Cycles/pixel or LW/PH) has been selected, one of the two composite multiple ROI plots shown below is produced. The 1D summary plots, which display MTF, rise distance, and chromatic aberration as a function of the distance from the image center, may be difficult to read for lenses that are poorly centered and hence have asymmetrical response. In such cases the 2D summary plots are far more readable. Starting with Imatest 2.6 (January 2008) a number of new options facilitate editing and refining multiple ROI selections. They are described here. You can also create Excel plots that summarize results from several multi-ROI runs, as shown on the right using the procedure given here. Summary plot 2D summary plot When one of the 2D images (Cy/Pxl or LW/PH) are selected, the image below is displayed. It shows the regions of interest (ROI) and the following parameters for each ROI. N (ROI number): Center-corner distance in % MTF50 Cycles/Pixel or LW/PH (displayed boldface for emphasis) MTF20 Cycles/Piexl or LW/PH Chromatic Aberration (area in pixels) The dotted circles delimit the central region (up to 30% of the center-to-corner distance), the part-way region, and the corner region (over 75% of the center-to-corner distance). The New Weighted MTF50 is the weighted mean of the mean MTFs in the three areas, where the weights are 1 (Central), 0.75 (part-way), and 0.25 (corner). 150 of 451
Imatest Documentation Multi-ROI 2D summary plot, showing Center-corner distance, MTF50, MTF20, and CA superimposed on image. This display can be particularly useful because lenses are not always centered properly. If they were, performance would be a simple function of the distance from image center. You can quickly review the summary results, then look at the detailed results for individual regions. It was developed because about 9 regions (center, 4 - part-way out, 4 - corner) is sufficient to characterize lens performance, but not sufficient for a meaningful 2D or 3D contour plot (which requires about 20 regions). Also, contour plots can only show one parameter (e.g., MTF50), while this display shows several. 1D Summary plot showing results as a function of distance from the center This figure contains two plots: MTF50 (upper left) and 10-90% rise distance (lower left). If Cycles/pixel is selected, units are relative to pixels; if LW/PH is selected, units are relative to image height. These figures show performance (MTF50 and rise distances without and with standardized sharpening). The Cycles/pixel Figure also plots Chromatic Aberration as a function of distance from the center of the image, scaled as the percentage of distance from center to corner (0 = center; 1 = corner). The most important results below are shown in Bold. Illustrations are for the first figure (Cycles per pixel in this case). 151 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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