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Imatest Documentation both A and B for the cycles per distance scales to be displayed. The maximum value displayed is the lower of the maximum values for A and B. Care must be used in interpreting results because sensors have widely varying pixel spacings and heights. Cycles/inch A and B-channels determine the color channel used for the analysis. The values are not stored between runs: Default is always displayed when MTF Compare starts. Default uses the default channel setting that was used and stored in the SFR run. This is typically the Y (Luminance) channel, but it can be any of the others. (corr) uses the results for the default channel with Standardized sharpening applied. R Red channel. G Green channel. B Blue channel. Y Luminance channel (not yellow). Approximately 0.3*R + 0.59*G + 0.11*B. Maximum display frequency (located at the bottom of the window between Save data and Exit ) is expressed as a fraction of the Nyquist frequency. The default, 2x Nyquist (1 cycle/pixel) shows all frequencies of interest for high performance digital cameras. But Imatest is sometimesused to measure systems that have much broader or rougher transitions, hence poorer high frequency response (for example, scanned printed paper). In such cases, much of the plot would be wasted. Available settings are 2x Nyquist (1 cycle/pixel) [the default] shows all frequencies of interest. 1x Nyquist (0.50 cycles/pixel) 0.5x Nyquist (0.25 cycles/pixel) 0.2x Nyquist (0.10 cycles/pixel) Other controls Save screen / Display snapshot (shown on the right) saves a snapshot of the screen (the entire MTF Compare GUI window) as a PNG image file. It also allows you to immediately view the snapshot so it can be used a reference for comparing with other results. File name and Directory at the top of the window set the location of the file to save. When you check the Open window in an image viewer... box, the current screen will be opened either the system default viewer (if the box under Image viewer is blank) or a viewer/editor of your choice (if the box contains the path name to the viewer/editor). I recommend using Irfanview, which is fast, compact, free, and supports an amazing number of image file formats. Its normal location in English language installations is C:\Program Files\IrfanView\i_view32.exe. Save data saves MTF Compare calculation results in an Excel-readable CSV file format. Help opens this web page in a browser window. Exit closes MTF Compare. The File dropdown menu has controls that allow you to set the font size (small, normal, or large) and reset the screen size and location to its original values. The Help dropdown menu has controls that allow you to open this web page in a browser window, register Imatest, and obtain version information. Another example 222 of 451
Imatest Documentation Comparison of two very different cameras This screen compares two very different cameras— the 8.3 megapixel Canon EOS-20D DSLR (with a high quality 24-70mm lens @ 70mm, f/8, which is about the optimum aperture) and the little 5 megapixel Panasonic Lumix DMC-TZ1 (a tiny camera that sports a 10x Leica zoom lens at f/3.6, which is about optimum for the TZ1's small (1/2.5 inch ≈ 7 mm diagonal) sensor. The test image for the EOS-20D was taken at the Imatest Lab; the image for the TZ1 was downloaded from the Imaging-resource.com website. Line Widths/Picture Height was chosen for Scale because it best represents total image quality. The picture height (in pixels) is quite similar for the two cameras: 2336 for the EOS-20D; 1920 for the TZ1. MTF Performance of the two cameras is remarkably similar, especially around the 50% level, though the hump in the TZ1's response indicates much stronger sharpening than the EOS-20D (DSLRs tend to use sharpening more conservatively). Indeed, a "halo" is visible near the edge. With additional sharpening the EOS-20D would clearly outperform the TZ1. If Cycles/mm or cycles/inch had been used for Scale, the results would have been harder to interpret because the sensor height is smaller for the TZ1. The pixels are also smaller: 2.2 microns vs. 6.8 microns. (Pixel size does not affect LW/PH mesurements.) Why, apart from the choice of lenses, bother with the heavy, expensive EOS-20D? Because they differ in a number of other image quality factors beyond simple MTF. The tiny 2.2 micron pixels in the TZ1 have more noise and a smaller dynamic range than the 6.8 micron pixels in the EOS-20D. As important as it is, MTF is not the only game in town. These tests were repeated in July 2007. The main difference was that we tested a Panasonic DMC-TZ1 in our own lab under similar conditions to the Canon EOS-20D (same target and lighting and same Canon 24-70 mm f/2.8L lens, f/8, 42 mm focal length). The results are remarkably consistent. 223 of 451
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