File:Cross ratio metrology example.svg
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Size of this PNG preview of this SVG file: 512 × 341 pixels. Other resolutions: 320 × 213 pixels | 640 × 426 pixels | 1,024 × 682 pixels | 1,280 × 853 pixels | 2,560 × 1,705 pixels.
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Summary
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English: Use of cross ratios to measure real-world dimensions of features shown in a rectilinear image (pinhole camera model) by CMG Lee. In (1), the width of the side street, W is computed from the known widths of the adjacent shops. In (2), the width of only one shop is needed as a vanishing point, V is visible. A, B, C, D and V are points on the image, their separation given in pixels; A', B', C' and D' are points in the real world, their separation given in metres.
The pixel measurements are correct when the thumbnail width is 217.656 pixels. Wolfram|Alpha gives small integer values of A'B', B'C' and C'D' for the values (7, 5, 2 and 7) given by the user at 109.190.80.46. |
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Own work,
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| Author | Cmglee |
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I, the copyright holder of this work, hereby publish it under the following licenses:
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:37, 7 August 2024 | | 512 × 341 (94 KB) | Cmglee (talk | contribs) | Make 7:5:2:7 ratio exact |
| 00:47, 7 August 2024 |  | 512 × 341 (94 KB) | Cmglee (talk | contribs) | Reduce glow intensity | |
| 00:45, 7 August 2024 |  | 512 × 341 (94 KB) | Cmglee (talk | contribs) | Address http://commons.wikimedia.org/w/index.php?title=User_talk%3ACmglee&diff=907205587&oldid=905930588 | |
| 23:53, 23 February 2018 |  | 512 × 341 (179 KB) | Cmglee (talk | contribs) | Fix numbering and mnemonic. | |
| 23:25, 23 February 2018 |  | 512 × 341 (179 KB) | Cmglee (talk | contribs) | {{Information |description ={{en|1=Use of cross ratios to measure real-world dimensions of features shown in a rectilinear image (pinhole camera model) by CMG Lee. In (1), the width of the side street, W is computed from the known widths of the adjacent shops. In (2), the width of only one shop is needed as a vanishing point, V is visible. A, B, C, D and V are points on the image, their separation given in pixels; A', B', C' and D' are points in the real world, their separation given in metres.}} |source ={{own}} |author =User:Cmglee |date = }} Category:Homography |
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