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--- notatki:autofocus [2025/05/21 19:37] – administrator
+++ notatki:autofocus [2025/05/21 20:44] (aktualna) – administrator
@@ Linia 1: / Linia 1: @@
 ====== Hardware: Jak działa autofocus? ======
+narzędzia wykorzystane:
+  * https://phydemo.app/ray-optics/simulator/
+  * https://imagej.net/ij/
+====== Wyostrzanie poprzez pomiar odległości (aktywne) ======
-====== Wyostrzanie poprzez wykrycie Fazy ======
+{{ :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 =====
@@ Linia 28: / Linia 44: @@
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stroke: light-dark(rgb(0, 0, 0), rgb(255, 255, 255));" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/><path d="M 919.88 73 L 912.88 76.5 L 914.63 73 L 912.88 69.5 Z" fill="#000000" style="fill: light-dark(rgb(0, 0, 0), rgb(255, 255, 255)); stroke: light-dark(rgb(0, 0, 0), rgb(255, 255, 255));" stroke="#000000" stroke-miterlimit="10" pointer-events="all"/></g></g><g data-cell-id="3"><g><path d="M 341 73 Q 641 53 671 23 Q 701 -7 726 23 Q 751 53 841 73" fill="none" stroke="#ff0000" style="stroke: light-dark(rgb(255, 0, 0), rgb(255, 144, 144));" stroke-width="2" stroke-miterlimit="10" pointer-events="stroke"/></g></g><g data-cell-id="4"><g><path d="M 1 73 Q 301 53 331 18 Q 361 -17 386 18 Q 411 53 501 73" fill="none" stroke="#1aff31" style="stroke: light-dark(rgb(26, 255, 49), rgb(0, 127, 0));" stroke-width="2" stroke-miterlimit="10" pointer-events="stroke"/></g></g><g data-cell-id="5"><g><rect x="386" y="73" width="210" height="30" fill="none" stroke="none" pointer-events="all"/></g><g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 208px; height: 1px; padding-top: 88px; margin-left: 387px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; color: #000000; "><div style="display: inline-block; font-size: 12px; font-family: &quot;Helvetica&quot;; color: light-dark(#000000, #ffffff); line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Linear sensor pixels</div></div></div></foreignObject><text x="491" y="92" fill="light-dark(#000000, #ffffff)" font-family="&quot;Helvetica&quot;" font-size="12px" text-anchor="middle">Linear sensor pixels</text></switch></g></g></g><g data-cell-id="6"><g><rect x="401" y="113" width="60" height="30" fill="none" stroke="none" pointer-events="all"/></g><g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 128px; margin-left: 402px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; color: #1AFF31; "><div style="display: inline-block; font-size: 12px; font-family: &quot;Helvetica&quot;; color: light-dark(#1AFF31, #007f00); line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Ray of light A</div></div></div></foreignObject><text x="431" y="132" fill="#1AFF31" font-family="&quot;Helvetica&quot;" font-size="12px" text-anchor="middle">Ray of lig...</text></switch></g></g></g><g data-cell-id="7"><g><rect x="471" y="113" width="60" height="30" fill="none" stroke="none" pointer-events="all"/></g><g><g transform="translate(-0.5 -0.5)"><switch><foreignObject style="overflow: visible; text-align: left;" pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 58px; height: 1px; padding-top: 128px; margin-left: 472px;"><div style="box-sizing: border-box; font-size: 0; text-align: center; color: #FF0000; "><div style="display: inline-block; font-size: 12px; font-family: &quot;Helvetica&quot;; color: light-dark(#FF0000, #ff9090); line-height: 1.2; pointer-events: all; white-space: normal; word-wrap: normal; ">Ray of light A</div></div></div></foreignObject><text x="501" y="132" fill="#FF0000" font-family="&quot;Helvetica&quot;" font-size="12px" text-anchor="middle">Ray of lig...</text></switch></g></g></g></g></g></g></svg></diagram>
+====== 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>

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