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Imatest Documentation 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 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 Simplified lighting diagram 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, It's the field of view, not the chart-to-camera distance, that counts. A rough rule of thumb: For an inkjet-printed chart the field of view should be at least 22 inches (60 cm) for a 6-megapixel camera; 35 inches (90 cm) for a 16 megapixel camera. Details below. For a high-quality photographically-printed chart (such as the charts from Applied Imaging) you can get quite a bit closer. A letter-sized (8.5x11 inch) chart printed on Premium Luster paper on the Epson 2200 (a high quality pigment-based inkjet photo printer) was analyzed for MTF using the 6.3 megapixel Canon EOS-10D. There was no change when the image field was at least 22 inches (56 cm) wide— twice the length of the chart. Performance fell off slowly for smaller fields. Choose a camera-to-target distance that gives at least this image field width. The actual distance depends on the sensor size and the focal length of the lens. The minimum image field is illustrated on the right. Cameras with more pixels, and hence higher potential resolution, should should have a larger image field width, hence printed chart width. Distance/field width guidelines for high quality inkjet charts (You can get closer with photographically-printed charts.) Image field width (in inches) > 8.8 × sqrt(megapixels) Image field width (in cm) > 22 × sqrt(megapixels) — or — There should be no more than 140 sensor pixels per inch of target or 55 sensor pixels per centimeter of the target. — or — The distance to the target should be at least 40X the focal length of the lens for 6-10 megapixel digital SLRs. (25X is the absolute minimum for 6 megapixel DSLRs; 40X leaves some margin.) For compact digital cameras, which have much smaller sensors, the distance should be at least 100X the actual focal length: the field of view is about the same as an SLR with comparable pixel count. The recommended distance is described in more detail in The camera-to-target distance is not critical as long as it is greater than a reasonable minimum. Sensor sizes Desig- Diagonal Width Height nation mm. mm. mm. 1/3.6" 5.0 4.0 3.0 1/3.2" 5.68 4.54 3.42 1/3" 6.0 4.8 3.6 163 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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