Imatest Documentation

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Imatest Documentation Register . The 30-day trial version will work with an Imatest Studio or Pro password. Path: You should add three folders to the system path if they are not present. In Windows XP, Open the Control Panel. Double-click on System. Click on the Advanced tab in the System Properties window (Advanced system settings in Vista). Click on Environment Variables . If Matlab is installed on your system, see the Path conflicts box, below. Select PATH in the User variables... window. Click on Edit . Check to see if the three folders listed below are included in the Variable value field for Path. ;%ProgramFiles%\Imatest;%ProgramFiles%\Imatest\bin\win32;%ProgramFiles%\Imatest\toolbox\matlab If they are not there, add them to the Variable value field. (You may copy and paste.) %ProgramFiles% is an environment variable that represents the system default program installation folder. It is equivalent to C:\Program Files in English-language installations. This folder has a different name in non-English installations, for example, C:\Programme in Deutsch, but %ProgramFiles% should be consistent for all languages. Alternatively, you may use the actual folder names. ;C:\Program Files\Imatest;C:\Program Files\Imatest\bin\win32;C:\Program Files\Imatest\toolbox\matlab (English-only) After you add the folders, be sure the Path list is well-formed— that it consists of proper folder names separated by semicolons (;). Click on OK , OK , OK to close the System window. Path conflicts If a different version of Matlab from the one used for Imatest (6.5.1) has been installed on your system, you may experience a path conflict that causes an error message similar to the message shown on the right— or Imatest IT/EXE may simply fail to run, without returning an error message. If you receive such a message, you can try two solutions. X The procedure entry point svDoubleSclarRemW could not be located in the dynamic link library libmwservices.dll 1. Alter the Path environment variable in System variables, located below User variables in the Environment Variables window. Be sure that the three folders listed above appear before the similar folders for the installed version of Matlab. This may involve some careful copying and pasting. Be sure to check the path carefully before you click OK . 2. Initiate IT/EXE programs using the second method shown below: call a DOS BAT file, which sets the path and calls the command line. (Do this instead of directly calling the command line.) This often resolves difficult conflicts. Setting up IT/EXE Set up the test system (lights, camera, etc.) and photograph a test chart lighted and framed as it would be in the actual tests. Save the image in a standard file format. It should have the same pixel count as the actual test images. Analyze the image using (GUI-based) Imatest Master. When the settings are correct— when the ROI (region of interest), the calculation details, and the output files and folder locations are what you need for production— press Save settings... (or Settings, Save Settings...) in the Imatest main window. This allows you to save the control information for Imatest IT/EXE in a named .INI file, which can be viewed and edited with any standard text editor. Be sure to save it in a convenient, accessible folder. The contents of .ini files are largely self-explanatory. Here is a sample. [sfr] nht_save = 2052 nroi = 2 nwid_save = 3076 roi_mult = 1606 931 1735 1149;334 1693 466 1912 aper = CA = Min camera = cyclesper = Max 396 of 451
Imatest Documentation cyclesper_value = 1 foclth = gamma = 0.5 The INI file is divided into sections that start with a bracketed name. [sfr], [q13], [colorcheck], [distortion], [uniformity] are the sections for the five programs that comprise IT/EXE. Of the remaining sections, only [api] (described below) affects IT/EXE operation. INI file: more detail General settings Press Settings, IT options in the main Imatest window to open a dialog box that sets options that only affect IT programs— they do not affect regular Imatest operation. These options are written into the INI file. Checking Always save then delete figures makes sure all figures are closed at the end of the run, no matter what the other settings indicate. Checking Never display progress bars and warning messages disables these graphic displays. These settings affect the contents of the following lines in the INI file. [api] nomsg = 1 savedel = 1 These lines can be edited in the INI file using any text editor; the IT Options box is merely a convenience. Certain other options in the [imatest] section may be of interest to IT users. [imatest] readexif = 1 (Reads EXIF data from JPEG images when set to 1; readexif = 0 turns off EXIF read.) Figures The INI control determines which figures are generated and saved. Any figures that aren't needed they should be turned off for speed. Most are set to either Min (figure off) or Max (figure on), but some (noted in the table below), are set to 0 (figure off) or a number >= 1 (figure on, depending on conditions). These parameters can be set using a text editor, but it's usually more convenient to uncheck the appropriate boxes in the input dialog box prior to saving the INI file. [Section] (module) Plot Name Plot or CSV/XML file [sfr] cyclesper MTF in cycles/(pixel or distance) 1 [sqf] (SFR) SQF LWPH MTF in LW/PH 2 CA Chromatic Aberration 3 shannon Shannon capacity 3 CSV output file (detailed results) 6 XML output file (detailed results) 7 SFR_cypx.csv (summary with Cycles/pixel) 4 SFR_lwph.csv (summary with LW/PH) 5 SQF (Subjective Quality Factor) SQF is in its own section, but affects SFR. [q13] (Stepchart) pltpix Patch levels and noise (First figure) 1 pltnoise Density response, noise, Dynamic range (Second figure) 2 pltallch Density response details (all colors) (Third figure) 3 CSV output file (detailed results) 4 XML output file (detailed results) 6 [colorcheck] pltones Grayscale tonal response and noise (First figure) 1 save_file_list index 8 (in [sfr]) 397 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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