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Imatest Documentation MTF contours (rectangular) MTF contours (polar) Display MTF contours in a rectangular plot with linear or logarithmic frequency display. Similar to the MTFnn rectangular plot. Display MTF contours in a polar plot whose geometry duplicates that of the target. EXIF data Show EXIF data if available. The displays on the right show MTF contours and MTF70 through MTF10 (spatial frequencies where MTF = 70 through 10% of the low frequency level). Spatial frequency is displayed in cycles per pixel, but Line Widths per Picture Height (LW/PH), cycles/inch, or cycles/mm can be selected by pressing Image settings & options . MTF70 – MTF10: Polar coordinates, Linear frequency on radius. 194 of 451
Imatest Documentation Log Frequency Analysis of log frequency-varying charts Introduction Log frequency, which uses the Rescharts interface, measures the contrast of narrow bar or sine charts that increase logarithmically in spatial frequency. It also measures color moiré (Imatest Master only). When the image pattern is sinusoidal (rather than a bar chart), contrast is equivalent to SFR or MTF. This method is more direct than the slanted-edge method, but less accurate and more susceptible to noise. A chart can be created by Test Charts and printed on a high quality inkjet printer. Log Frequency image (complete and cropped) The image above used to illustrate the Log frequency module and to compare results with Slanted-edge SFR. It was captured with a Canon EOS-20D camera, 24-70mm f/2.8L lens set at 42mm, f/5.6, ISO 100. It includes Log Frequency-Contrast charts and slanted-edges with high and low contrast (20:1 and 2:1). Log frequency was run using a narrow strip of the Log f-contrast chart, as shown above. Creating and photographing the chart and running the program Create the test chart, which may not be commercially available, using Imatest Test Charts, then print the chart on a high quality inkjet printer. Test Charts has a number of options. The dialog box and recommended settings are shown in Log F-Contrast. In Imatest Studio, Type (bar or sine) should be set to Bar, sine (4x). Mount the chart on a flat dark board— 1/2 inch foam board works well; thinner board warps more easily. Depending on the number of horizontal pixels in the chart to be analyzed, the chart should occupy 1/3 to 1/4 of the horizontal frame. Other charts can be mounted along with it. Orientation. The pattern may be rotated by multiples of 90 degrees from the orientation shown: it may be have portrait as well as landscape orientation. Photograph the chart using the sort of lighting described in Imatest Lab or How to test lenses, taking care to avoid glare. Save the image in any one of several high quality formats, but beware of JPEGs with high compression (low quality), which will show degraded quality, unless, of course, you are testing JPEG degradations. (Unlike the slanted-edge, the Log f-contrast pattern reveals JPEG losses quite clearly). Open Imatest, then click on Rescharts . The Rescharts window is described in the Rescharts page. Select a pattern to analyze (in this case, Log frequency (simple) ) by clicking on one of the entries in the popup menu below Chart type or by clicking on Read image file if Log frequency (simple) is displayed. The Read image file button and popup menu (shown on the right) are highlighted (yellow background) when Rescharts starts. Select the image to read. If the pixel size is the same as the previous Log frequency run, you'll be asked if you want to use the previous ROI, adjust the previous ROI, or crop anew. If the folder contains meaningless camera-generated file names such as IMG_3734.jpg, IMG_3735.jpg, etc., you can change them to meaningful names that include focal length, aperture, etc., with the View/Rename Files utility, which takes advantage of EXIF data stored in each file. Cropping The pattern should be cropped to a narrow strip, as shown in the ROI fine adjustment window, below. 10 to 25 pixels is a typical strip width, though more pixels may work if the chart is well-aligned. The ROI fine adjustment window may be maximized 195 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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