File:Cross ratio metrology example.svg
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editDescriptionCross ratio metrology example.svg |
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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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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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Short title | cross ratio metrology example |
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Image title | 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 because 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. |
Width | 100% |
Height | 100% |