File:Cross ratio metrology example.svg
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Original file (SVG file, nominally 512 × 341 pixels, file size: 94 KB)
Summary
| Description |
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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| Source |
Own work,
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| Author | Cmglee |
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation Licence, 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 licence is included in the section entitled GNU Free Documentation Licence. |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:07, 7 August 2024 | | 512 × 341 (94 KB) | wikimediacommons>Cmglee | Make 7:5:2:7 ratio exact |
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