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====== Hardware: Jak działa autofocus? ======

narzędzia wykorzystane:
  * https://phydemo.app/ray-optics/simulator/
  * https://imagej.net/ij/

====== Wyostrzanie poprzez pomiar odległości (aktywne) ======

{{ :notatki:autofocus1.svg |}}

$$
\frac{1}{f} = \frac{1}{o} + \frac{1}{i}
$$

Gdzie:

  * $f$ — ogniskowa soczewki (w metrach lub centymetrach),
  * $o$ — odległość przedmiotu od soczewki,
  * $i$ — odległość obrazu od soczewki.

====== Wyostrzanie poprzez wykrycie Fazy (pasywne) ======

===== Sytuacja w której obraz jest wyostrzony na matrycy =====


{{.:pasted:20250521-192149.png?700}}

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===== Sytuacja w której obraz jest wyostrzony za matrycą =====



{{.:pasted:20250521-192229.png?700}}

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===== Sytuacja kiedy obraz jest wyostrzony przed matrycą =====


{{.:pasted:20250521-192317.png?700}}


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====== Wyostrzanie poprzez kontrast (pasywne) ======

Skrypt w pythonie obliczający sumę wszystkich różnic pomiędzy parami pikseli w obrazku.

<code python get_diff_pixel.py>
from PIL import Image

def main():
    img = Image.open("greyscale.png").convert("L")
    pixels = list(img.getdata())
    n = len(pixels)

    total = 0
    for i in range(n):
        pi = pixels[i]
        for j in range(i + 1, n):
            total += abs(pi - pixels[j])

    print(f"Pixels read: {n}")
    print(f"Sum of abs diffs over all pairs: {total}")

if __name__ == "__main__":
    main()

</code>

===== Wyniki dla obrazka wyostrzonego =====

{{.:pasted:20250521-204417.png}}

<code>
Pixels read: 11970
Sum of abs diffs over all pairs: 4496510654
</code>

===== Wyniki dla obrazka niewyostrzonego =====

{{.:pasted:20250521-204252.png}}

<code>
Pixels read: 11970
Sum of abs diffs over all pairs: 3223391491
</code>









===== Źródła =====

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