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Imatest Documentation The percentage of clipped pixels is not a reliable index of the severity of clipping or of the measurement error. For example, it is possible to just barely clip a large portion of the image with little loss of accuracy. The plot on the right illustrates relatively severe clipping, indicated by the sharp "shoulder" on the black line (the edge without standardized sharpening). The sharp corner makes the MTF look better than reality. The absence of a sharp corner may indicate that there is little MTF error. low contrast target is recommended for reducing the likelihood of clipping: it increases exposure latitude and reduces the sensitivity of the MTF results to errors in estimating gamma. SFRplus summary Clipping warnings SFRplus analyzes images of the SFRplus test chart, framed so that there is white space above and below the horizontal bars in the chart, i.e., so neither bar runs off the image. The bars may, however, run off the sides of the image. The white space should be between 0.5% and 25% of the image height. There should be few or no interfering patterns (bars, etc.) outside the image of the chart itself. Lighting should be even and glare-free. Lighting and alignment recommendations are given in The Imatest test lab. The first time SFRplus is run, it should be run through Rescharts. This allows parameters to be adjusted and saved for later use in the automatic version of SFRplus, which is opened with the SFRplus button in the Imatest main window. results (listed above) to be examined interactively in the Rescharts window. The SFRplus button on the main Imatest window runs SFRplus in full automatic mode using settings saved from the most Rescharts run. Next: Using SFRplus Part 3: Results Pixel size 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. Sensor Diagonal Width Height Designation mm. mm. mm. (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 36.0 172 of 451
Imatest Documentation Using SFRplus Part 3 Imatest SFRplus results Imatest SFRplus performs highly automated measurements of several key image quality factors using a speciallydesigned test chart. Unlike other modules, the user never has to manually select Regions of Interest (ROIs). Image quality factors include Sharpness, expressed as Spatial Frequency Response (SFR), also known as the Modulation Transfer Function (MTF), Noise, Lateral Chromatic Aberration, Distortion (with less detailed output than the Distortion module), and Tonal response (again, with less detail than Stepchart; no noise statistics) Color accuracy, when used with an SFRplus that contains the optional color pattern, located above the central square. ISO sensitivity (Saturation-based and Standard Output Sensitivity), when incident lux is entered. This document illustrates SFRplus results. Part 1 introduced SFRplus and explained how to obtain and photograph the chart. Part 2 showed how to run SFRplus inside Rescharts and how to save settings for automated runs. SFRplus results New in Imatest 3.5.2 The Lens-style MTF plot is similar to MTF displays in the Canon, Nikon, and Zeiss websites. New in Imatest 3.5.1 Several geometrical alignment results are displayed in the Image & geometry plot. New in Imatest 3.5 ISO sensitivity is calculated when the incident lux level is entered. New in Imatest 3.4.1 Calculations are now much faster. A Speedup checkbox has been added to the SFRplus setup window to further increase speed by eliminating some calculations that most users don't need (SQF, noise histograms, clipping check, etc.). When calculations are complete, results are displayed in the Rescharts window, which allows a number of displays (shown on the right) to be selected. A general description can be found on Using Rescharts. Multi-ROI summary display 173 of 451
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