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Imatest Documentation for a spot, and -0.1 (-10%), which is the density for a highly visible spot. All values above -0.005 are displayed as white and all values below -0.1 are displayed as black. The color map for the standard pseudocolor plot is variable, based on the minimum and maximum values of the processed image. This approach removes much of the interfering detail from the final plot so that spots are clearly visible. Detail: Simulated spots and Spot detection display 346 of 451
Imatest Documentation Using Distortion Distortion New in Imatest 3.4 Distortion can analyze edges near the image boundary (in addition to lines). New in Imatest 2.7.1 Distortion can analyze square (checkerboard) patterns. measures radial lens distortion, an aberration that causes straight lines to curve, calculates coefficients for removing it using nonlinear optimization, and provides additional information on geometric distortion in digital images. Distortion calculates the coefficient for correcting distortion using Picture Window Pro, which uses a tangent/arctangent distortion model. A procedure for obtaining approximate Ptlens coefficients is described below. Lens distortion has two forms, barrel and pincushion, as illustrated below. None Barrel Pincushion Distortion tends to be most serious in extreme wide angle, telephoto, and zoom lenses. It is most objectionable in architectural photography and photogrammetry — photography used for measurement (metrology). It can be highly visible on tangential lines near the boundaries of the image, but it's not visible on radial lines. In a well-centered lens distortion is symmetrical about the center of the image. But lenses can be decentered due to poor manufacturing quality or shock damage. In the simplest lens distortion model, the undistorted and distorted radii ru and rd (distances from the image center normalized to the center-to-corner distance (half-diagonal) so that r = 1 at the corner) are related by the equation, ru = rd + k1 rd 3 where k1 > 0 for barrel distortion and k1 < 0 for pincushion. This third-order equation is one of the Seidel Aberrations, which are low-order polynomial approximations to lens degradations. Other aberrations include astigmatism, coma, curvature of field, etc. The third order approximation is sufficient for many lenses, but Imatest also calculates the fifth-order coefficients, which can be more accurate for certain lenses, for example, for the Sigma 18-125mm zoom at 18mm and the Zeiss 21mm f/2.8 Distagon. ru = rd + h1 rd 3 + h2 rd 5 The fifth-order equation can quantify "wave" or "moustache" distortion, which might, for example, resemble barrel near the center of the image and pincushion near the corners. Distortion by Paul van Walree is excellent background reading. To measure distortion, you'll need a rectangular or (preferably) a square grid pattern, which you can create using Test Charts. Print the chart, photograph it, and enter the image into the Imatest Distortion module, as described below. Instructions Test chart. You can use any chart with a square or rectangular grid or a square (checkerboard) pattern. You can create your own using the Distortion grid or checkerboard pattern the Imatest Test Charts module, or the Imatest Screen Patterns module (Distortion grid or Squares (checkerboard)). 347 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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