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Imatest Documentation 5. 6. Display of Mask input image Read the Mask input image. This is the image of a plain, unstuctured surface used to create the mask. Create the mask. The light blue box to the right of the image contains the controls for creating the mask. Three sliders control the appearance of the mask. Upper threshold (default 70) is a variable threshold, that changes with the average (lowpass-filtered) image brightness. Increasing it shrinks the light areas of the mask. Lower threshold (default 10) is an absolute threshold, used so that noise in dark areas is not included in the mask. Gamma (default 0.5) is the encoding gamma used for creating the Mask input image file. It should be 0.5 for most standard image files (with color spaces such as sRGB, etc.) designed for display at gamma = 1.8 or 2.2. (It doesn't have to be precise.) It should be set to 1 for linear files, i.e., files created without gamma-encoding. It affects the uniformity of the mask. When you've adjusted these sliders, click Update mask to create the mask, which will appear in the main window. All desired areas should be a part of the mask (i.e., white in the B&W mask image). In this case, we want each fiber to be distinct: we don't want them to be merged. Since the mask calculation is very fast we recommend tryuing out the slider settings to see what they do. Displays can be zoomed in or out if the Zoom box is checked. You can zoom in by clicking on the image or drawing a box with the mouse. You zoom out by double-clicking on the image. A zoomed portion of the mask is shown below. 416 of 451
Imatest Documentation 7. 8. Mask image, zoomed The View filter button displays the lowpass-filtered version of the Mask input image, used for the Upper (variable) threshold. Read the Uncorrected image. This is the image that must be corrected before it can be entered into Imatest. The first image on this page is an example. Correct the image. The cyan box on the lower right contains the correction controls. The only adjustment is the slider that sets the maximum averaging iterations (the number of passes where adjacent pixels inside the mask (white regions) are averaged). For this image there was little improvement for more than two passes. Press the Correct image button to perform the correction. The correction iteratively grows the image in the masked areas (white in the mask image) into adjacent unmasked areas (black in the mask image) until convergence is detected. It can be somewhat slow, but it may be sped up in future releases. The corrected image appears in the window. 417 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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