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Imatest Documentation Spot detection (Imatest Master only) Noise detail, illustrating aliasing. (The actual noise is not as bad as it looks.) When Spot detection w / threshold (pseudocolor) is selected in the Noise detail popup menu, the pseudocolor display emphasizes dark spots (the type that result from dust on the sensor) and minimizes noise, light spots, and long range density variations. The following webcam image (originally 1600 pixels wide) has two rows of five simulated spots (added by an image editor). Other irregulatities are from the sensor itself.. Webcam image with 10 simulated spots (5 in each of 2 rows) With the standard Pseudocolor contours with colorbar display, the darker spots are clearly visible, but the lighter spots are lost in the overall density variations. 344 of 451
Imatest Documentation Image with spots: standard pseudocolor display But they stand out in the Spot detection display. The differences in the algorithms are described below. Image with spots: Spot detection display When Pseudocolor contours with colorbar is selected, the image is normalized to its average level. Then the local variations are calculated by subtracting a highly smoothed version of the image from a moderately smoothed version of the image. This is the same data used for the contours in the Local noise with added contours display, described above. When Spot detection w / threshold (pseudocolor) is selected, there are several differences. The "highly" smoothed version of the image is less aggressively smoothed. This emphasizes local variations more strongly. The contour plot has a fixed color map, showing only values between = -0.005 (-0.5%), which is about the threshold of visibility 345 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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