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Imatest Documentation Using SFRplus Part 1 The SFRplus chart: features and how to photograph it Imatest SFRplus performs highly automated measurements of several key image quality factors using a speciallydesigned test chart. Unlike other modules, the user does not need 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 chart that contains the optional color pattern, located above the central square. ISO sensitivity (Saturation-based and Standard Output Sensitivity), when incident lux is entered. SFRplus operates in two modes. Interactive/setup mode (run in Rescharts), which allows you to set up region selection and calculation parameters and interactively examine results in detail. Auto mode (run with the SFRplus button in the Imatest main window), which runs automatically with no additional user input. ROIs are selected automatically based on settings saved from the Rescharts interactive/setup mode. This allows images of different sizes and framing to be analyzed with no change of settings. Auto mode is especially useful for automated testing, where framing varies from image to image. This document introduces SFRplus and explains how to obtain and photograph the chart. Part 2 shows how to run SFRplus inside Rescharts and how to save settings for automated runs. Part 3 illustrates the results. New in Imatest 3.5.2 The Lens-style MTF plot is similar to MTF displays on 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.). Here are two displays that illustrate some of the many capabilities of SFRplus. Other displays include MTF, Chromatic Aberration and noise statistics for individudual regions, and image and geometry (including distortion), color error, tonal response and uniformity profiles for the image as a whole. 158 of 451
Imatest Documentation 3D Plot for MTF50 (one of many available results). 3D plots have a great many display options; they can be rotated freely or viewed from the top. The SFRplus test chart The standard SFRplus test chart is illustrated below. Lens-type MTF plot (similar to MTF plots from the Canon, Nikon, and Zeiss websites. Standard SFRplus test chart: 5x9 grid, 10:1 and 2:1 contrasts, 20-step 4x5 stepchart (0.1 density increment), and focus star. Sharpness is derived from light-to-dark slanted edges at the boundaries of the squares, as described in Sharpness: What is it and how is it measured? The new chart enables SFRplus can handle a wide range of camera aspect ratios; the left and right sides of the chat can extend beyond the frame or be inside the frame. The essential features of the SFRplus chart are Bars at the top and bottom used for measuring distortion and facilitating edge detection. A grid of slanted squares with contrasts no greater than 10:1. 4x7, 5x7, 5x9 and 7x11 (row x columns) are the available grid sizes. The square orientation facilitates measurement of Lateral Chromatic Aberration using vertical edges (which are near-tangential) near the corners. This orientation also helps with the Lens-style MTF plots, which are similar to MTF displays on the Canon, Nikon, and Zeiss websites. The squares above and below the middle square are reserved for non-spatial measurements. In the standard chart, the square below the middle is a 4x5 stepchart with density steps of 0.1 used to measure tonal response and gamma, and the square above the middle square contains either a fine star pattern (used as a focusing aid; not for analysis) or a 4x5 color pattern for measuring color accuracy. A small number of low contrast (typically 2:1) squares for measuring the effects of nonlinear signal processing. Charts may optionally have squares of a single contrast. This is helpful for 3D plots that map the performance over the image surface. Grid of squares 5x9 SFRplus chart options (can be selected when ordering) Standard Options & notes 4x7, 5x7, and 7x11 are also available. 5x9 is best suited for HTDV (16:9 aspect ratio) and DSLRs (3:2 aspect ratio). 5x7 is best suited for compact digital cameras and cameraphones (4:3 aspect ratio). Main contrast level 10:1 from 40:1 to 1.1:1, Greater than 10:1 not recommended. Secondary contrast level 2:1 Same as main level or as low as 1.1:1. Shows effects of nonlinear processing. Stepchart Included (below center) Omitted in chrome on opal or glass charts Color chart Omitted Included (above center). L*a*b* values will be sent in a file. Focus star Inluded (above center) May be omitted. Used as a focus aid (not for analysis). Omitted if color chart is included Advantages of the SFRplus chart over the ISO 12233 chart 159 of 451
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