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Imatest Documentation Maskfill Removes features that interfere with Imatest measurements Introduction to Maskfill Imatest Maskfill (mask and fill) is a standalone program for removing features in test images that interfere with Imatest analysis. A typical image is shown below: it has passed through a fiber optic bundle that adds a "honeycomb" interfering pattern. Imatest modules such as SFR will often fail with this pattern. Maskfill removes the honeycomb pattern so that Imatest modules can run properly and produce correct results. Please contact us if you are interested in purchasing Maskfill. SFR slanted-edge test image with interference: used as the Uncorrected image To run Maskfill, you'll need an image of a uniform, featureless surface (white or gray preferred) taken with the same interfering pattern as the test image(s). This pattern, called the Mask input, is used for creating a mask (the first step in Maskfill). Image of plain surface: used as the Mask input. Must be the same pixel size and alignment as the uncorrected image. 414 of 451
Imatest Documentation Instructions 1. 2. 3. 4. Install Maskfill by double-clicking on the install file, which has a name like Maskfill-1.n.exe (where n is a number). Imatest Master should be installed first. Maskfill is installed into the Imatest program file (C:\program files\Imatest in English language installations). Acquire one or more test target images and one image of a plain, unstructured surface (the mask input). The image of the plain surface is used for making the mask: it should have the same interfering pattern as the test images. Save the images in standard file formats (TIFF, PNG, JPEG (high quality), etc.). The mask input image and the test target images must have the same alignment and the same pixel size. Open Maskfill by clicking on the icon on the Windows wallpaper (background) that is installed with the program, or by opening Windows Explorer and clicking on Maskfill in the Imatest program file. The following screen (shown reduced to 75% of the original size) appears. This window can be maximized to enhance the resolution of the images. Maskfill: initial display The Maskfill window. Most of the left side is reserved for the main image. The lower-left contains the Display/Read/Save area for the four images processed by Maskfill. The four file names (the long white boxes) are all Untitled when Maskfill is started. The Mask input: the image of a plain, unstuctured surface used to create the mask: the second of the images above. The Mask, which can be read in or created using controls in the blue area on the right. Shown below. The Uncorrected image, i.e., with interference: The first of the images above. The Corrected image, i.e., with interference removed. Shown below. The Read buttons above all files but Corrected image open dialog boxes for reading the files, which will be displayed after they are read. The Save buttons above Mask file and Corrected image save the files calculated by Maskfill. The file names replace "Untitled" in the long white boxes. The buttons on the upper right ( M-in , Mask , Img-U, Img-C )can be used to display one of these four images on the upper right. The large buttons above all four file boxes display the files. If Mask input or Uncorrected image files have not been read in, the dialog box for reading them will be displayed. If Mask file hasn't been calculated or read, it will be calculated if the Mask input file has been read in. Here is the display after Mask input (the image of the plain, unstructured surface) has been read. The long file name box for the displayed image is highlighted in yellow. 415 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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