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Imatest Documentation center. This counteracts barrel distortion... The internal unit used for rsrc and rdest is the smaller of the two image lengths divided by 2. This equation drives me nuts! rsrc and rdest are reversed from the equations on this page; it only goes up to fourth power (when you include rdest outside the parentheses; third power if you don't); and it has even order terms (a and c) when the theory implies that distortion can be modeled with odd terms only. Give me a higher order term (h * rdest 4 ) and dump a * rdest 3 and c * rdest. But nonetheless it works pretty well. Mike Collins has posted a technique for finding PTlens parameters on a dpreview.com forum. I haven't checked to verify it. Briefly, 1) take a shot of the grid pattern and run Imatest distortion. Note the k1 (which is the r^3) parameter. 2) divide my magic number = -3.397. This result is now used as the b (r^3) parameter in Ptlens. 3) Edit the profile file used in Ptlens to include this new lens. Use the bodies multiplier, lens name, focal length, a, b, c ( make a and c 0.000000; and b from calculation in 2) ). More details on the post. Modeling distortion of super-wide-angle lenses for architectural and archaeological applications by G. E. Karras, G. Mountrakis, P. Patias, E. Pets Algorithm for calculating correction coefficients. The coefficients of the standard distortion equations are calculated using nonlinear optimization that straightens the lines (minimizes their curvature). The equations are ru = rd + k1 rd 3 (3rd order) rd is the distorted (input) radius; ru is the undistorted (output) radius. ru = rd + h1 rd 3 + h2 rd 5 (5th order) ru = tan(10 p1 rd ) ⁄ (10 p1 ) ; h1 > 0 (arctan/tan; barrel distortion) ru = tan -1 (10 p1 rd ) ⁄ (10 p1 ) ; h1 < 0 (arctan/tan; pincushion distortion) The optimizer finds the average locations of vertical and horizontal lines in the image, scans between the lines to find (x,y) locations on the lines (and if there is room, scans lines that intersect the image boundaries), finds polynomial fit for each line, minimizes the sum of squares of the second order polynomial coefficients, which are the line curvatures. For the 5th order case the optimizer minimizes the sum of squares of the second and fourth order polynomial coefficients— a slightly different error function from the 3rd order and arctan/tan cases. Since optimization is performed only to straighten curved lines, this algorithm is relatively insensitive to perspective distortion and small amounts of camera misalignment. 360 of 451
Imatest Documentation Imatest Instructions -- Miscellaneous modules and utilities Using Test Charts Creates test charts for high quality inkjet printers Test Charts creates test chart files for printing on high quality inkjet printers. Two types of chart can be created: bitmaps and Scalable Vector Graphics (SVG), which can also be sent out for precision printing. A variety of options is available. You can select chart pattern, type (bar or sine), contrast, highlight color, printer gamma, and more. To run Test Charts, run Imatest and click on Test Charts in the Imatest main window. The following dialog box, which contains the initial (default) settings, appears. The available settings change for different patterns. The file pixel size and the dimensions when printed at the specified PPI (bitmap files only) is shown on the lower left. The file may be printed at any desired size. Select the Pattern (the type of chart), the options, and the folder (directory) and file name for the test chart file. When you are ready to create the file, click on Create test chart . You may cancel by clicking on Close . When the calculations are complete a figure showing the chart (not for printing) appears. You can zoom in to see the fine detail. The figure with the image of the chart is for preview only: it shows you what the chart looks like and lets you zoom in if you want. Do not print the chart directly from this figure. Load bitmap Print Test output files (chart_temp.tif in the above example) into an image editor (such as Photoshop, Picture Window Pro, or Irfanview (a great free image viewer that can read and write nearly every known format)) and print it from the editor. SVG (Scalable Vector Graphics) files can be printed from Inkscape (or imported into Adobe Illustrator or Corel Draw). This will allow you to select the size of the print, add annotations, use color management, etc. The best way to print the charts is to convert the TIFF files from black & white into 24-bit color and print them using a color-managed workflow with ICC profiles. Manufacturer-supplied profiles are usually sufficient; custom profiles may be better when tonal values are critical. 361 of 451
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Imatest Documentation Using SFRplus
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