Imatest Documentation

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Imatest Documentation you'll have a chance to refine it. For Slanted-Edge SFR, select the region you want. Recommended cropping. For Log Frequency (simple), select a narrow strip running from along the direction of increasing spatial frequency. Narrow strips of the Log Frequency-Contrast chart can be used. For Log F-Contrast, select most of the chart image, leaving small margins (1/2 to 1% of the image dimensions) at the edges. After the rough crop has been selected, the fine adjustment box appears, showing the coarse crop as a rectangle. This dialog box can be enlarged or maximized to facilitate the adjustment. It offers numerous options. Crop for the Log Frequency-contrast chart. Leave a small margin (1/2 - 1% of the image height) at the top and bottom. The entire ROI can be moved ( ^ > v < , upper-left). The top, bottom, left, or right sides can be moved ( T^ Tv R> R< B^ Bv L> L< , middle-left). You can choose between Fine, Coarse, and Extra Coarse movement (1, 5, or 25 pixels of movement per click). The display can be zoomed out or in. Pixel values for the four corners can be entered (X(tl), Y(br), ..., where tl = top-left, br = bottom right, etc.). The origin is the upper-left. Be sure to press the Enter key after entering a value. When you have completed the fine adjustment, click one of the buttons on the bottom of the window. If you click Yes, Continue , an additional dialog box may appear. The entries in this dialog box can be changed later by clicking on Image settings & options in the Rescharts window. If you click Yes, Continue in Express mode , it will go directly to the Rescharts window, using saved (recent) values. The Rescharts window After the image file has been entered, calculations are performed and the most recent Chart view is displayed. The MTF/contrast (2D pseudocolor contour) display (actual MTF when a sine chart is used) for Log F-Contrast is shown below. 188 of 451
Imatest Documentation MTF contours for Canon EOS-20D, 24-70mm f/2.8L, 42mm, f/5.6, ISO 100 The main display image is on the upper left. Additional text results may appear below this image. An image of the chart is shown on the upper right. You can choose to display the whole image or the crop (ROI). The remainder of the right side is the control area. The Zoom checkbox turns Zoom on and off. The buttons to the right of Zoom set the display to either the Whole image or a Crop of the image (the selected ROI). Image and Display areas The image area is on the right of the Rescharts window, just below the Whole image and Crop buttons. It includes the the Read image file and Reload buttons, the Chart type dropdown menu (described above), and additional controls. Reload reloads an image from a file or reacquires it from a device or video stream (depending on how the image was originally acquired). It is most valuable for versions of Imatest that can acquire images from devices or streams. Immediately below the Chart type menu is the New crop (same image) menu, which has identical entries. If an item is selected on this menu, the image is recropped for analysis by the selected chart type (which may be the same or different). This menu is useful when several regions of an image need to be analyzed or when the target contains more than one chart type. Image settings & options brings up the input dialog box for the selected chart type. This is the same box that appears when you press Yes, continue (not Express mode) in the ROI repeat or ROI selection window. Display, immediately below the image area, selects the results to display. Choices depend on the chart type. The Display options area is immediately below Display. The contents, which depend on the Display selection, are described below in the sections for the individual displays. 189 of 451
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