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Imatest Documentation Run date mm/dd/yyyy hh:mm of run. (blank line) Tables (blank line) Additional data (blank line) EXIF data Separated by blank lines if more than one. Two tables are produced. The first table contains MTF. The columns are Spatial frequency in Cy/mm, LW/PH, MTF (selected channel), MTF (Red), MTF (Green), MTF (Blue), MTF (Luminance = Y). (...) represent rows omitted for brevity. The second table contains the edge. Columns are x (location in pixels), Red edge, Green edge, Blue edge, Luminance (Y) edge, and Chromatic Aberration (the difference between the maximum and minimum). The first entry is the name of the data; the second (and additional) entries contain the value. Names are generally self-explanatory (similar to the figures). Displayed if available. EXIF data is image file metadata that contains important camera, lens, and exposure settings. By default, Imatest uses a small program, jhead.exe, which works only with JPEG files, to read EXIF data. To read detailed EXIF data from all image file formats, we recommend downloading, installing, and selecting Phil Harvey's ExifTool, as described here. This format is similar for all modules. Data is largely self-explanatory. Enhancements to .CSV files will be listed in the Change Log. The optional XML output file contains results similar to the .CSV file. Its contents are largely self-explanatory. It is stored in [root name].xml. XML output will be used for extensions to Imatest, such as databases, to be written by Imatest and third parties. Contact us if you have questions or suggestions. An optional .CSV file is also produced for multiple ROI runs. Its name is [root name]_multi.csv. 184 of 451
Imatest Documentation Using Rescharts Analysis of resolution-related charts Introduction Imatest Rescharts analyzes images of several test charts for resolution-related parameters such as sharpness (i.e., spatial frequency response; MTF), color moiré, and fine detail lost to software noise reduction, using a highly interactive user interface is similar to Multicharts. The following chart types are supported by Rescharts. Applied Image QA-77 chart SVG SFR chart: m x n grid SFRplus chart Slanted-edge SFR Duplicates SFR, but with a far more interactive interface. It calculates and displays the average edge, SFR (Spatial Frequency Response or MTF), and Lateral Chromatic Aberration. Includes one figure not in SFR: a histogram with noise analysis. It supports all charts that contain slanted edge patterns, including the ISO 12233 chart and its derivatives. Charts may be purchased from sources such as Applied Image or created with Test Charts (SVG charts are especially recommended) and printed on a high quality inkjet. SFRplus Highly automated analysis of SFR (MTF), Lateral Chromatic Aberration, distortion, and tonal response. Introduced in Imatest 3.2. Uses a special test chart, shown on the left. Unlike other Rescharts modules, SFRplus does not require manual region (ROI) selection: it is performed automatically. Running SFRplus in Rescharts saves settings for fully automated runs. SFRplus instructions 185 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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