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Imatest Documentation After the run is complete, you can save ROIs for future runs in a named file by clicking on Save settings in the Imatest main window. These settings can be retrieved later by clicking on Retrieve settings . Cropping recommendations For best accuracy the length should be between about 80 and 500 pixels. In most cases little is gained for lengths over 300 pixels. The width (height in the image on the right) should be at least 50 pixels. The light and dark zones should be at least 10 pixels wide, with 20 preferred. Little is gained for minimum dark/light zone widths over 40 pixels or total width over 100 pixels. My typical crops are between around 120x80 and 300x140 pixels. The absolute minimum and maximum crop dimensions are 10 and 1200 pixels (800 for strong ROI filtering). For very small crops (width or length less than about 25 pixels) a warning message may appear in place of the light/dark level display: Zero counts in n bins. Accuracy may be reduced. This indicates that some interpolation was required to obtain the final result, and that you should be aware that results may not be as accurate or repeatable as they would be for larger ROIs. Small crops or noisy images may require weaker error filtering than normal crops/images. Press Options & Settings... in the Imatest main window and set SFR ROI filtering to Light filtering. SFR input dialog box After you select the Region(s) of Interest (ROI(s)) the Imatest SFR input data window appears, unless Express mode has been selected. All input fields are optional. Most of the time you can simply click OK (the box on the lower right) to continue. Selections are saved and can be used for future express runs. The input data window is described fully in SFR instructions, Part 2. It is divided into sections: Title and Help on top, then Plot, Options, Settings, Optional parameters, and finally, OK or Cancel . Here are a few highlights. 258 of 451
Imatest Documentation SFR input dialog box (full version) Plot This area controls which figures to plot. Figures are listed on the left. Plot settings are saved between runs. The boxes adjacent to "Cycles per" control the x-axis display for MTF plots. You can choose between Cycles per pixel (the default), Cycles per inch, or Cycles per mm. If you choose Cycles per inch or mm, you must enter a number for the pixel size— either in pixels per inch, pixels per mm, or microns per pixel. If pixel size is omitted, the x-axis will be displayed in Cycles per pixel. For the second plot you can choose between LW/PH and LP/PH (Line Pairs per Picture Height). Display options affects the appearance of plots. Secondary readout (defaults to MTF30, the spatial frequency for 30% contrast; MTF50 is the primary readout.) Can be set for MTFnn or MTFnnP at any contrast level or to MTF at a specified spatial frequency in cycles/pixel, line pairs/inch or line pairs/mm. For example, you might select MTF at the half-Nyquist frequency, 0.25 cycles/pixel. Details. MTF plot freq selects the maximum display frequency for MTF plots. The default is 2x Nyquist (1 cycle/pixel). This works well for high quality digital cameras, not for imaging systems where the edge is spread over several pixels. In such cases, a lower maximum frequency produces a more readable plot. 1x Nyquist (0.5 cycle/pixel), 0.5x Nyquist (0.25 cycle/pixel), and 0.2x Nyquist (0.1 cycle/pixel) are available. Edge plot selects the contents of the upper (edge) plot. Three displays are available. 1. Edge profile (linear) is the edge profile with gamma-encoding removed (the default). 2. Line spread function (LSF) is the derivative of the linear edge profile. 3. Edge pixel profile is proportional to the edge profile in pixels, which includes the effects of gamma encoding. The edge can be cropped (default) or the entire edge can be displayed. Chart contrast For a medium or low contrast charts (contrast
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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