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Imatest Documentation The input dialog box for the first run is the same as for standard non-batch runs. Additional runs use the same settings. Since no user input is required they can run extremely fast. If the order of the files in a batch runs is different from the selection order, click Settings, Options and Settings... (in the Imatest main window) and change the setting in Batch run order. The sequence may be affected by Windows Explorer settings. One caution: Imatest can slow dramatically on most computers when more than about twenty figures are open. For this reason we recommend checking the Close figures after save checkbox, and saving the results. This allows a large number of image files to be run in batch mode without danger of bogging down the computer. Crop the image to minimize edge effects. Typical crops (for automatic zone detection) are shown below, indicated by red rectangles. Click outside the image for no crop. The orientation does not need to be correct; Imatest will rotate the image to the correct orientation. To display the exposure error correctly (for reflective targets only), select the entire chart, including any clipped highlight patches that may be present. If the aspect ratio (length:width) of the crop is less than 4:1, the selection will be rejected (Imatest Studio) or a dialog box for one of the Applied Image/ISO charts will appear (Imatest Master). If you plan to use manual Zone detection (selected in the Stepchart input dialog box, below), the selection can be approximate: a fine selection window will enable you to refine the crop. Crop of a Kodak Q-13 chart . Crop of a Stouffer T4110 chart (better without the tilt). This is an image processed by Stepchart, after cropping. Make any needed changes to the Stepchart input dialog box. Chart type A reflective target with density steps of 0.10 (the Kodak Q-13/Q-14) is selected by default. If you are using a transmission target, be sure to choose the correct target type. In Imatest Master you can enter a table of densities from an ASCII file (one density per line). Automatic (default) must be unchecked to enable Veiling glare measurements. (See Dynamic range, below.) Click OK to continue. 268 of 451
Imatest Documentation Stepchart input dialog box Zone detection You can toggle between Automatic (the default) and Manual Zone detection with the Automatic (default) checkbox. If it is unchecked, a fixed number of patches (6-41) can be selected with the slider for Stepchart analysis, and a fine ROI adjustment box appears after OK is pressed. This option is useful when high noise in dark regions confuses the automatic ROI detection, or when veiling glare is to be calculated. (Zone detection can also be set from Options & Settings in the Imatest main window.) Fine ROI selection (dialog box detail): Details here. Scaling You can select the minimum value of the x-axis for figures 2 and 3. This setting defaults to Auto. Setting it manually allows several successive runs to be scaled identically, which can clarify comparisons between different cameras. Results (Fig. 1), Lower plot: Pixel noise Three noise displays are available for the lower-left plot in first figure. Noise (%) normalized to image density range = 1.5 Noise (%) normalized to 255 pixels Noise in pixels (maximum of 255) Values 0-255. Values 0-1. Useful because it references the noise to the scene: noise performance is not affected by camera contrast. Values 0-1. Noise will be worse for higher contrast cameras (affected by the gamma encoding) Noise Detail (Fig. 2), Middle plot: f-stop noise or SNR Two types of display are available for the middle-left plot of the second figure. The effects of gradual illumination nonuniformities have been removed from the results. f-stop noise Scene-referenced noise, based on f-stops (factors of 2 in exposure or illumination) SNR (based on f-stops) Scene-references Signal-to-Noise Ratio, based on f-stops. Note that there are many ways of defining SNR. Most are image (or pixel)-referenced. Results are different from S/N in the lower plot (which is more standard). The scaling (minimum and maximum values) can be set in the dropdown menus to the right of the radio buttons. Most of the time these should be left at Auto. The values are inverted when the display is toggled between F-stop 269 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation Instructions
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