5.20 TV Distortion 2 AA A + = A1 A2 B - Michel Thoby
To measure the TV distortion a box that nearly fills the image is placed in ... of corners and centre of the box's image are measured and the difference gives the ...
SMIA 1.0 Part 5: Camera Characterisation Specification
5.20 TV Distortion 5.20.1 Description TV Distortion is a measure of the perceived distortion in an image. To measure the TV distortion a box that nearly fills the image is placed in object space. A simple grid chart that fulfils this function is attached to this specification (see Appendix B). The difference in height of corners and centre of the box’s image are measured and the difference gives the TV distortion. Note that while it is recommended that the edges of the box should be parallel with the edges of the field of view, it is recognised that this will not always be possible. Mathematically the TV Distortion is given by and the following equation
TV _ Dist (%) = where
A − B 100 × B 1
A=
A1 + A2 2
The reported value is the average distortion of the four corners of the box. Note that pincushion distortion is positive distortion and barrel is negative distortion.
A1
B
A2
Figure 6: Distorted image of a square, showing pincushion distortion To ensure accurate measurements of distortion, the camera module should be placed at the nominal focussed distance and the optical axis of the camera must be perpendicular to the plane of the test chart. See section 4.2.1.
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Tokina 10-17 mm @ 15 mm & f/5,6. -2,5. -2. -1,5. -1. -0,5. 0. 0,5. 0. 5. 10. 15. 20. 25. Distance from the center along the sensor diagonal (mm). Shift of the red and ...
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Angle from the lens axis (degrees) in the object space. Distance fro m center o f the FF senso r (mm) and measured o n the image. Tokina 10-17 mm @ 15 mm.
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14mm Samyang. Ideal 14 mm rectilinear. Focal length (mm) Vs Field Angle. Poly. (Focal length (mm) Vs Field Angle). Variation of the focal length along the field.
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