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Imatest Documentation The signal processing algorithms are proprietary; they are a part of a manufacturer's "secret sauce" for producing pleasing images. Though they vary a great deal, some generalizations can be made. Most cameras do NOT apply noise reduction and sharpening uniformly throughout an image. Contrasty edges tend to have better (more extended) MTF than low contrast edges. For this reason it may be a good idea to photograph both a relatively contrasty edge (though not so high that it causes clipping) as well as a relatively low contrast edge. The SVG charts (above) are excellent choices. Both types of edge can also be produced using Imatest Test Charts. An estimate of chart contrast derived from the average light and dark pixel levels (away from the transition) and gamma is displayed in several places in SFR and Rescharts Slanted-edge SFR. (Estimated chart contrast = (avg. pixel level of light area/avg. pixel level of dark area)^(1/gamma) ). Nonlinearities are analyzed in depth in the Log F-Contrast module. Photograph the chart Framing Frame the chart so that there is white space above and below the bars (used to measure distortion) at the top and bottom of the images. The white areas should be at least 0.5% and no more than 25% of the total image height. Ideally the white space should be 1-6% of the image height. The chart should be vertically centered, but this is not necessary for SFRplus to run successfully. The stepchart pattern is close to the horizontal center of the chart. The sides of the chart may extend beyond the image (as shown below) or be well within the image. The software is designed to accommodate a wide variety of framing and aspect ratios. Edges closest to the left and right boundaries will always be properly located. If the left and right sides of the chart are inside the image, there should be no interfering patterns in the image that could be mistaken for chart features— chart surroundings included within the image should be or light gray. Well-framed SFRplus image The chart should be aligned correctly using techniques and tricks shown in The Imatest Test Lab. Moderate misalignment is tolerated by SFRplus: a tilt of 1-2 degrees, perspective distortion, etc., but every effort should be made to align the chart properly. Moderate barrel or pincushion distortion (
Imatest Documentation Lighting Interfering patterns near borders (Can be cropped in Imatest 3.4+) Same pattern; interfering patterns masked out Missing white space above top distortion bar Some tilt, distortion tolerated The chart below summarizes lighting considerations. The goal is even, glare-free illumination. Lighting angles between 30 and 45 degrees are ideal in most cases. At least two lights (one on each side) is recommended; four or six is better. Avoid lighting behind the camera, which can cause glare. Check for glare and lighting uniformity before you expose. A detailed description of the recommended lighting setup, which uses six high quality (CRI > 98) 4700K (near-daylight) 50W SoLux quartz-halogen lamps, can be found in The Imatest Test Lab. SoLux Task Lamps may also be used. The BK Precision 615 Light meter (Lux meter) is an outstanding low-cost instrument (about $100 USD) for measuring the intensity and uniformity of illumination. Distance Distance and field of view The camera must be far enough from the chart so you are measuring the sharpness of your camera and lens, not the chart. But remember, 235 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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Imatest Documentation Instructions
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