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Summary
| Description |
English: Illustration of autofocus using phase detection. In each figure, the purple circle represents the object to be focused on, the red and green lines represent light rays passing through apertures at the opposite sides of the lens, the yellow rectangle represents sensor arrays (one for each aperture), and the graph represents the intensity profile as seen by each sensor array. Figures 1 to 4 represent conditions where the lens is focused (1) too near, (2) correctly, (3) too far and (4) way too far. It can be seen from the graphs that the phase difference between the two profiles can be used to determine not just in which direction, but how much to move the lens to achieve optimal focus. Note: The figures are not to scale, and colours are used purely for clarity and do not represent any particular wavelength.
Italiano: Illustrazione di autofocus con rilevazione di fase. In ciascuna figura, il cerchio viola rappresenta l'oggetto da mettere a fuoco, le linee rosse e verdi rappresentano raggi di luce che passano attraverso aperture ai lati opposti della lente, il rettangolo giallo rappresenta la matrice di sensori (uno per ciascuna apertura) ed il grafico rappresenta il profilo di intensità visto da ogni matrice di sensori. Le figure da 1 a 4 rappresentano le condizioni in cui si concentra la lente (1) troppo vicino, (2) correttamente, (3) troppo e (4) troppo lontano. Si può vedere dai grafici che la differenza di fase tra i due profili può essere utilizzato per determinare non solo in quale direzione, ma anche di quanto bisogna spostare l'obiettivo per ottenere il fuoco ottimale. Nota: Le figure non sono in scala, ed i colori vengono utilizzati unicamente per chiarezza e non rappresentano qualsiasi lunghezza d'onda particolare. |
| Source | Own work |
| 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 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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:21, 24 August 2017 | 512 × 341 (7 KB) | Cmglee | Make background opaque. | |
| 21:20, 24 August 2017 | 512 × 341 (7 KB) | Cmglee | Use more realistic profiles. | ||
| 20:35, 16 January 2013 | 512 × 1,280 (5 KB) | Cmglee | Fix lens movement and add decoration. | ||
| 00:09, 1 April 2012 | 512 × 1,024 (5 KB) | Cmglee | {{Information |Description ={{en|1=Illustration of autofocus using phase detection. In each figure, the purple circle represents the object to be focused on, the red and green rays represent light rays passing through apertures at the extreme sides ... |
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