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Imatest Documentation bottom right of the "Bad" image above is caused Distortion to terminate in Imatest versions earlier than 2.3.6, but is very likely to work will with 2.3.6+. Three cropping (ROI selection) options are available by clicking Settings, Options and Settings... in the Imatest main window. These include Never crop. Select crop by dragging cursor. Ask to repeat crop for same sized image. Select crop by dragging cursor. Do not ask to repeat crop. Although the first option (Never crop...) was the default in early version of Distortion, the second option (Select crop by dragging cursor. Ask to repeat crop for same sized image), which is similar to the ROI selection in SFR, may be preferred in many cases. The input dialog box, shown below, appears. Title defaults to the file name; you may change it if needed. The most important choice is the algorithm that detects pattern location. Figures can be selected in the Plot box on the right. Plot intersection points, Plot radius correction, and Display corrected image appear in Imatest Master only. Pattern For grid patterns, choose Grid. Distortion input dialog box For lines, choose Single line (some interference). This is the appropriate choice for the usable lines in the ISO-12233 pattern. "Interference" refers to extra detail that may be present near the line (lettering, etc.) This choice will work for lines near the boundaries of a grid pattern. An example from an ISO-12233 chart is shown below. For square/checkerboard patterns, choose Squares (checkerboard). This pattern, introduced with Imatest 2.7.1, may be slightly more robust than the grid. Calculate line display using selects the formula for plotting the corrected lines. Useful for comparing the different algorithms. Choices are 3rd order (coefficient k1 , below), 5th order (coefficients h1 and h2 , below), and PW Pro (Picture Window Pro) tan/arctan (coefficient p1 , below). Decentering calculation is described below. It is optional because it takes extra time. It can only be selected for the Grid pattern. It the box is unchecked, distortion is assumed to be symmetrical around the geometric center of the image. ROI filtering When set to Strong, this setting filters out ROIs that might cause Distortion to crash — in Imatest versions earlier than 2.3.6. We recommend setting ROI filtering to Weak since many boundary conditions that formerly crashed Imatest now work well. Plot area. Selects which plots to produce. 350 of 451
Imatest Documentation Plot distortion figure selects the main distortion figure. The Plot intersection points and Detect points outside crop checkboxes are described below. If the first of them is checked, another figure is produced. They only work with the Grid pattern. Plot radius correction is described below. Display corrected image creates an additional figure with the corrected image calculated with the algorithm selected in Calculate line display using, above. It is most valuable for highly distorted lenses where the input image has been cropped. Choices are never, crop only (the default), and always. An example is shown below in the section on Severe distortion. Click OK . The calculations are performed, and the results figure(s) described in Results appears. You can zoom in by clicking on (and highlighting) the magnifier icon , then clicking on portions of the image of interest, as shown below. The detected points on the image are shown as red squares. The straightened line is drawn in magenta. Double-clicking restores the entire image. An enlarged portion of the results figure. When the calculations are complete the Save dialog box appears. The default directory is subdirectory Results in the data file directory. You can change to another existing directory, but new results directories must be created outside of Imatest— using a utility such as Windows Explorer. (This is a limitation of this version of Matlab.) The selections are saved between runs. You can examine the output figures before you check or uncheck the boxes. Select the items you wish to save, then click Yes or No . File names (where filename is the input file name): [filename]_distortion.png [filename]_corrected.png (only if displayed) [filename]_intersections.png [filename]_radius_corr.png [filename]_summary.csv [filename].xml The root file name ([filename], above) defaults to the image file name, but can be changed using the Results root file name box. Be sure to press enter. Checking Close figures after save is recommended for preventing a buildup of figures (which slows down most systems) in batch runs. The CSV and XML files contain EXIF data, which is image file metadata that contains important camera, lens, and exposure settings. By default, Save results dialog box Imatest uses a small program, jhead.exe, which works only with JPEG files, to read EXIF data. To read detailed EXIF data from all image file formats, we recommend downloading, installing, and selecting Phil Harvey's ExifTool, as described here. Results Main figure An example of Distortion output is shown below for the Sigma 18-125 mm f/3.5-5.6 DC lens (designed for APS-C-sized sensors, such as the Canon EOS-10D, 20D, Digital Rebel, Nikon D100, D70, etc. The Sigma is an excellent lens — a bargain — 351 of 451
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