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Imatest Documentation Multiple file selection Several files can be selected in Imatest Master using standard Windows techniques (shift-click or control-click). Depending on your response to the multi-image dialog box you can combine (average) several files or run them sequentially (batch mode). Combined (averaged) files are useful for measuring the effects of image stabilization. The combined file can be saved. Its name will be the same as the first selected file with _comb_n appended, where n is the number of files combined. Batch mode allows several files to be analyzed in sequence. There are three requirements. The files should (1) be in the same folder, (2) have the same pixel size, and (3) be framed identically. 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. RAW files Starting with Imatest Master 2.7 (February 2008) Imatest SFR can analyze Bayer raw files: standard files (TIFF, etc.) that contain undemosaiced data. RAW files are not very useful for measurring MTF because the pixel spacing in each image planes is twice that of the image as a whole; hence MTF is lower than for demosaiced files. But Chromatic aberration can be severely distorted by demosaicing, and is best measured in Bayer RAW files (and corrected during RAW conversion). Details of RAW files can be found here. Selecting the ROI (Region of Interest) If the image has the same pixel dimensions as the image in the previous run, a dialog box shown below asks you if you want to repeat the same ROIs (regions of interest) as the previous image. You can retrieve saved ROIs from past runs by clicking on Retrieve settings in the Imatest main window. If you answer No or if the image has a different size, the coarse selection dialog box shown on the right is displayed with the instructions, Select ROI by clicking and dragging, or clicking outside image. Click on one corner of the intended region, drag the mouse to the other corner, then release the mouse button. Click outside the image to select the entire image. Note: the Zoom feature of Matlab Figures does not work here. Imatest mistakenly assumes you are trying to select the entire image. To enlarge the image (to view the crop area more clearly), maximize it by clicking on the square next to the upper right corner of the Window. After you make your selection the ROI find adjustment dialog box, shown below, appears. You can move the entire ROI or any of the edges in increments of one pixel. You can also enter the ROI boundary locations in the boxes below the image. If you do this, be sure to press return (or move the cursor) to register the ROI selection: ISO 12233 chart change. You can zoom out to view the entire image, then zoom back in. The ROI fine adjustment is particularly valuable for maximizing the size of small regions and excluding interfering detail. 128 of 451
Imatest Documentation ROI fine adjustment When you finish adjusting the ROI, proceed by selecting one of five choices at the bottom of the box. Yes, Continue Yes, Continue in Express mode Yes, select another region The selected ROI is correct; no more ROIs are to be selected. Continue with SFR calculations in normal mode: You will be asked for additional input data, etc. The selected ROI is correct; no more ROIs are to be selected. Continue with SFR calculations in Express mode: You will not be asked for additional input data or for Save options. Saved or default settings will be used. The selected ROI is correct. Select another ROI. For multiple ROIs additional Figures will display performance as a function of distance from the image center. No, try again The selected ROI is not correct. Try again. Cancel Cancel the SFR run. Return to the Imatest main window. If the the height or width of the ROI is under 10 pixels, the ROI is over 250,000 pixels or appears to be inappropriate, you'll be asked to repeat the selection. The ROI is normally checked for validity, but there are some cases (e.g., endoscopes) where valid images may fail the usual tests ROI filtering can be relaxed considerably by opening the Options and Settings... button in the Imatest main window (Pro only) and clicking Light filtering in the first group of controls. This can can lead to errors when regions are selected carelessly. Normal filtering is the default. 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 80 and 500 pixels. Little is gained for lengths over 300 pixels. The absolute minimum and maximum crop dimensions are 10 and 1200 pixels (800 for strong filtering). If possible, the width (height in the image on the right) should be at least 50 pixels. Minimum widths for light and dark zones should be at least 10 pixels, 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. For very small crops (width or length between 10 and 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 results, which may not be as accurate or repeatable as they would be for larger ROIs. 129 of 451
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