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Imatest Documentation Main figure with extreme (simulated) pincushion distortion, illustrating arrows. Here is an example of results from an ISO 12233 test pattern, which contains two lines suitable for measuring distortion. They work but they're not ideal: they would be better if they were thinner and closer to the image boundaries. This camera has a modest amount of pincushion distortion. A zoom of a portion of the selected area is shown above. Decentering (Imatest Master only) Distortion is normally centered around the geometric center of the image, but it may be decentered due to poor lens manufacturing quality or shock (i.e., dropping the lens). Decentering can appear as a shift in the center of distortion symmetry or as asymmetrical 354 of 451
Imatest Documentation MTF (sharpness) measurements in SFR. Distortion calculates decentering if Decentering calculation is checked in the Input dialog box and |k1| > 0.01. (k1 is the third-order coefficient.) If |k1| is smaller, distortion is insignificant (and difficult to see); hence decentering has no meaning. Decentering is reported by the radius (in units of the distance from the image center to the corner) and angle in degrees of the center of distortion symmetry. It is illustrated in the simulated pattern below. The geometrical center of the image is indicated by a pale blue +. The center of the decentered distortion is indicated by bold red X. Severe distortion: Corrected image figure Results showing centering (+ for image; X for distortion center) Images from optical systems with severe distortion (fisheye lenses, etc.) often need to be cropped so Distortion can detect vertical and horizontal lines. (See good/bad images, above.) The figure below illustrates an inexpensive fisheye lens. The crop area, shown in the middle, is displayed with full contrast; the area outside the crop has reduced contrast. 355 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 tilted (about
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Imatest Documentation MTF50 in Line
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Imatest Documentation SQF Subjectiv
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Imatest Documentation RAW converter
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Imatest Documentation CSF( f ) = 2.
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Imatest Documentation Sharpness com
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Imatest Documentation (DPR) Canon E
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Imatest Documentation A Kodak Q-13
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Imatest Documentation P_Rm = O_Rm*A
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Imatest Documentation Split view, s
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Imatest Documentation ISO Sensitivi
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Imatest Documentation σ 2 = Σ (ti
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Imatest Documentation Target size C
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Imatest Documentation Level the tar
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Imatest Documentation Kodak Q-14 St
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Imatest Documentation in the Imates
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Imatest Documentation samples (fold
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Imatest Documentation Using Imatest
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Imatest Documentation About RAW fil
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Imatest Documentation Options I for
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Imatest Documentation Special user
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Imatest Documentation CSV files- Ex
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Imatest Documentation RAW files RAW
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Imatest Documentation dcraw The ori
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Imatest Documentation Targets Chart
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Imatest Documentation Rope trick (f
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Imatest Documentation Distortion ta
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Imatest Documentation If you fail t
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Imatest Documentation Diagnostics r
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Imatest Documentation A horizontal
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Imatest Documentation the edges pri
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Imatest Documentation The camera mu
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Imatest Documentation Epson 2200 Pr
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Imatest Documentation Using SFR Par
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Imatest Documentation ROI fine adju
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Imatest Documentation Two precautio
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Imatest Documentation The PNG files
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Imatest Documentation nroi = 9 nwid
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Imatest Documentation An optional .
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Imatest Documentation SFR results:
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Imatest Documentation Right column
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Imatest Documentation Right: Input
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Imatest Documentation Below the plo
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Imatest Documentation Multi-ROI 2D
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Imatest Documentation The Legend at
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Imatest Documentation MTF50 (Cy/Pxl
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Imatest Documentation Summary plot
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Imatest Documentation SFRplus setup
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Imatest Documentation SFRplus setti
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Imatest Documentation Gamma Gamma i
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Imatest Documentation Weighted MTF5
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Imatest Documentation It's easy to
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Imatest Documentation Using Reschar
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Imatest Documentation Select an ima
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Imatest Documentation MTF contours
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Imatest Documentation SFRplus SFR H
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Imatest Documentation Log F-Contras
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Imatest Documentation Log Frequency
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Imatest Documentation Color moiré
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Imatest Documentation MTF Compare r
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Imatest Documentation Batchview Pos
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Imatest Documentation Rescharts SFR
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Imatest Documentation Running Batch
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Imatest Documentation standard mono
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Imatest Documentation SFRplus setup
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Imatest Documentation SFRplus setti
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Imatest Documentation Additional pa
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Imatest Documentation Output files
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Imatest Documentation Lens-style MT
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Imatest Documentation File formats
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Imatest Documentation Sharpness tar
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Imatest Documentation Proper exposu
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Imatest Documentation If you answer
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Imatest Documentation SFR input dia
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Imatest Documentation Figures (.PNG
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Imatest Documentation contrast imag
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Imatest Documentation Chromatic Abe
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Imatest Documentation QA-61 ISO-160
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Imatest Documentation Stepchart inp
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Imatest Documentation A camera's (o
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Imatest Documentation The total dyn
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Imatest Documentation ISO-15739 Noi
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Imatest Documentation You can enter
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Imatest Documentation Results If RA
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Imatest Documentation Dynamic range
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Imatest Documentation Using Colorch
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Imatest Documentation horizontal fi
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Imatest Documentation Colorcheck in
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Imatest Documentation The first fig
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Imatest Documentation An additional
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Imatest Documentation Instructions
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Imatest Documentation 7. 8. Mask im
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Imatest Documentation 9. Corr Image
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Imatest Documentation Appendix Cros
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Imatest Documentation Sorted by tes
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Imatest Documentation Distortion Un
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Imatest Documentation Create Scalab
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Imatest Documentation Jan. 6, 2007
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Imatest Documentation Sept. 11, 200
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Imatest Documentation XML Changes N
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Imatest Documentation License The I
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