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Imatest Documentation 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. Saving ROIs between runs. ROIs may be saved in named files by clicking on the Save settings button on the right of the Imatest main window. To restore the old settings, click on the Retrieve settings button. This allows you to recover old ROIs after runs with different image sizes and ROIs. SFR input dialog box The Imatest SFR input dialog window, shown below, opens after the Region of Interest (ROI) has been selected, except when Express mode has been selected. It appears only once during multiple ROI runs. Succeeding runs use the same settings except for (calculated) Crop location. All input fields are optional. Most of the time you can simply click OK (the button on the lower right) to continue. SFR input dialog box This window is divided into sections: Title and Help on top, then Plot, Options, Settings, Optional parameters, and finally, OK or Cancel . Title defaults to the input file name. You may leave it unchanged, replace it, or add descriptive information for the camera, lens, converter settings, etc.— as you please. Help opens a browser window containing a web page describing the module. The browser window sometimes opens behind other windows; you may need to check if it doesn't pop right up. Plot selects figures to plot. These figures are listed on the left. Plot settings are saved. Only Cycles per (pixel) and Chromatic Aberration are checked by default. The LW/PH (or LP/PH) plot is unchecked (by default) because it is largely redundant. The boxes to the right of "Cycles per" control the x-axis display. 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). 130 of 451
Imatest Documentation Pixel size has an important relationship to image quality. For very small pixels, noise, dynamic range and low light performance suffer. Pixel size is rarely given in spec sheets: it usually takes some math to find it. If the sensor type and the number of horizontal and vertical pixels (H and V) are available, you can find pixel size from the table on the right and the following equations. pixel size in mm = (diagonal in mm) / sqrt(H 2 + V 2 ) pixel size in microns = 1000 (diagonal in mm) / sqrt(H 2 + V 2 ) Pixel size in microns (microns per pixel) can be entered directly into the SFR input dialog box. Example, the cute little 5 megapixel Panasonic Lumix DMC-TZ1 has a 1/2.5 inch sensor and a maximum resolution of 2560x1980 pixels. Guessing that the diagonal is 7 mm, pixel size is 2.1875 (rounded, 2.2) microns.You can find detailed sensor specifications in pages from Sony, Panasonic, and Kodak. Sensor Diagonal Width Height Designation mm. mm. mm. (Type) 1/4" 4.5 1/3.6" 5.0 4.0 3.0 1/3.2" 5.68 4.54 3.42 1/3" 6.0 4.8 3.6 1/2.7" 6.59 5.27 3.96 1/2.5" 6.9 - 7.2 1/2" 8.0 6.4 4.8 1/1.8" 8.93 - 9.1 7.18 5.32 2/3" 11.0 8.8 6.6 1" 16.0 12.8 9.6 4/3" 22.5 18.0 13.5 35mm 44.3 24.0 36.0 For the Multi-ROI plot you can choose between Off, 1D plots (results as a function of center-corner distance with MTF in Cycles/Pxl, LW/PH), 2D image plots (results superimposed on image with MTF in Cycles/Pxl, LW/PH). You can also plot multi-ROI SQF (Subjective Quality Factor), which is explained here. Noise spectrum and Shannon capacity is unchecked by default because the results are difficult for most users to interpret and may not be meaningful, especially when significant noise reduction has been applied. It will not be plotted if the selected region is too small for adequate noise statistics. If both Chromatic Aberration and Noise spectrum and Shannon capacity are checked, the two plots share the same figure: CA on top and Noise/Shannon capacity at the bottom. Display options (to the right of Plot) are settings that affect the plot display. Secondary readout controls the secondary readout display in MTF plots. The primary readout is MTF50 (the half-contrast spatial frequency). Three secondary readouts are available with several options. The first defaults to MTF30 (the spatial frequency where MTF is 30%). The third is used only for SFRplus Lens-style MTF plots. Clicking Change opens the window shown on the right. Secondary readout settings are saved between runs. Choices: The upper radio button (MTF) for each readout selects MTFnn, the spatial frequency where MTF is nn% of its low frequency value. The middle radio button selects MTFnnP, the spatial frequency where MTF is nn% of its peak value: useful with strongly oversharpened edges. The lower radio button (MTF @ ) selects MTF @ nn units, where nn is a spatial frequency in units of Cycles/pixel, LP/mm, or LP/in. If you select this button, the pixel spacing should be specified in the Cycles per... line in the Plot section of the input dialog box, shown above. A reminder message is displayed if the pixel spacing has been omitted. 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. The edge can be cropped (default) or the entire edge can be displayed. Three displays are available. 1. 2. Edge profile (linear) is the edge profile with gamma-encoding removed. The values in this plot are proportional to light intensity. This is the default display. Line spread function (LSF) is the derivative of the linear edge profile. MTF is the fast fourier transform (FFT) of the LSF. 131 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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