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Imatest Documentation Pixel size has an important relationship to image quality. For very small pixels, noise, dynamic range and low light performance suffer. Pixel size is rarely given in spec sheets: it usually takes some math to find it. If the sensor type and the number of horizontal and vertical pixels (H and V) are available, you can find pixel size from the table on the right and the following equations. pixel size in mm = (diagonal in mm) / sqrt(H 2 + V 2 ) pixel size in microns = 1000 (diagonal in mm) / sqrt(H 2 + V 2 ) Pixel size in microns (microns per pixel) can be entered directly into the SFR input dialog box. Example, the cute little 5 megapixel Panasonic Lumix DMC-TZ1 has a 1/2.5 inch sensor and a maximum resolution of 2560x1980 pixels. Guessing that the diagonal is 7 mm, pixel size is 2.1875 (rounded, 2.2) microns.You can find detailed sensor specifications in pages from Sony, Panasonic, and Kodak. (Type) 1/4" 4.5 1/3.6" 5.0 4.0 3.0 1/3.2" 5.68 4.54 3.42 1/3" 6.0 4.8 3.6 1/2.7" 6.59 5.27 3.96 1/2.5" 6.9 - 7.2 1/2" 8.0 6.4 4.8 1/1.8" 8.93 - 9.1 7.18 5.32 2/3" 11.0 8.8 6.6 1" 16.0 12.8 9.6 4/3" 22.5 18.0 13.5 35mm 44.3 24.0 36.0 142 of 451
Imatest Documentation SFR results: MTF (Sharpness) plot If you entered Imatest on this page, you may want to explore the background information in these links. Sharpness introduces sharpness measurements and MTF. Sharpening describes Standardized sharpening. How to test Lenses with Imatest contains conscise instructions on testing lenses. Image quality factors lists the factors measured by Imatest. Imatest SFR displays Edge profiles and SFR (Spatial frequency response) plots with spatial frequency labelled in Cycles per Pixel (C/P) or Cycles per distance (inches or mm), and/or Line widths per picture height (LW/PH; shown below), depending on the checkbox settings of the first two lines of the Plot section of the SFR input dialog box , shown below. The LW/PH box is unchecked by default. Note that one cycle (or line pair) is equivalent to two line widths. 143 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation Image Quality
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