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Imatest Documentation Targets Charts are mounted on 40x60 inch (100x150 cm) or 30x40 inch (75x100 cm) 1/2 inch (1.25 cm) thick foam board, which is lightweight, rigid (unlikely to warp), and easy to find at art supply shops. The images below show entire targets. Framing would normally be tighter for test images (much tighter for the Q-14, ColorChecker, and OECF targets). In some cases, the charts are mounted on neutral, middle gray (~18% reflectance) mat board, which is attached to foam board, to ensure correct exposure in cameraphones and webcams with autoexposure. Charts are mounted using permanent double-sided tape or spray adhesive, available from hardware and art supply stores. We have used 3M 45 and 3M Photo Mount sprays, both of which are "Photo safe." 3M Super 77 is not labeled "Photo safe," (and can't be sold in California), but it should be OK for attaching gray mat board to foam board. Sharpness targets The SFRplus chart, introduced with Imatest 3.2, features automated region detection for sharpness and other measurements. It offers numerous advantages over the well-known ISO 12233 chart, particularly more accurate measurements due to reduced contrast, sufficient regions to produce a good lens response map, and compatibility with automatic region detection. SFRplus also measures distortion, tonal response, gamma (contrast), and color accuracy (with the optional color chart shown below). It is especially useful for automated testing. SFRplus charts are available for purchase. SFRplus color chart Two additional sharpness targets are also used in the Imatest lab, though less frequently than the SFRplus chart. Both consist of several charts printed on Epson Enhanced Matte (Ultra Premium Presentation - Matte) paper, which resolves detail as well as semigloss and glossy inkjet papers, but is much less susceptible to glare. These charts support SFR as well as several Rescharts modules (SFR, Log F-Contrast, Log Frequency, and Star Chart). 72 of 451
Imatest Documentation Target size Chart location Sharpness target (30x40 inch) for cameras up to about 16 megapixels Sharpness target (40x60 inch), for cameras over about 16 megapixels (recommended for cameras over 8 megapixels) 40x60 inches (100x150 cm) 30x40 inches (75x100 cm) For images over 13 megapixels; Recommended for images over 8 megapixels Center 1x2 SVG SFR chart, 20:1 and 2:1 contrast, trimmed. Right of center Standard 144-cycle sinusoidal Siemens Star chart, printed 30 cm (11.81 inches) high on 13x19 inch paper, trimmed on left and right. For images up to 13 megapixels 2 – 1x2 SVG SFR charts, 20:1 and 2:1 contrast, trimmed. Standard 144-cycle sinusoidal Siemens Star chart, printed 20 cm (7.87 inches) high on US letter-size paper 73 of 451
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Imatest Documentation © 2009 Imate
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