zad14 error-approx

aprox-error/aprox-error.py

@@ -0,0 +1,42 @@
+import networkx as nx
+
+from typing import Tuple
+
+# Zad14
+# Author: Michał Pluta
+
+class AproxError:
+    def __init__(self, BITMAP_R, BITMAP_G, BITMAP_B):
+        for px in [x1, x2]:
+            for py in [y1, y2]:
+                self.DIFF_R[px][py] = BITMAP_R[px][py];
+                self.DIFF_G[px][py] = BITMAP_G[px][py];
+                self.DIFF_B[px][py] = BITMAP_B[px][py];
+
+    def aprox_err(self, x1: int, y1: int, x2: int, y2: int, rgb1: Tuple[int, int, int], rgb2: Tuple[int, int, int], rgb3: Tuple[int, int, int], rgb4: Tuple[int, int, int]):
+        def update_diffs(x: int, y: int, mul: float, rgb: Tuple[int, int, int]):
+            self.DIFF_R[x][y] -= rgb[0] * mul
+            self.DIFF_G[x][y] -= rgb[1] * mul
+            self.DIFF_B[x][y] -= rgb[2] * mul
+
+        for px in [x1, x2]:
+            for py in [y1, y2]:
+                px1 = (px - x1) / (x2 - x1)
+                py1 = (py - y1) / (y2 - y1)
+
+                mul1 = (1.0 - px1) * py1
+                update_diffs(px, py, mul1, rgb1)
+
+                mul2 = px1 * py1
+                update_diffs(px, py, mul2, rgb2)
+
+                mul3 = (1.0 - px1) * (1.0 - py1)
+                update_diffs(px, py, mul3, rgb3)
+
+                mul4 = px1 * (1.0 - py1)
+                update_diffs(px, py, mul4, rgb4)
+
+        self.ERROR = 0
+        for px in [x1, x2]
+            for py in [y1, y2]
+                self.ERROR += 0.5*(DIFF_R[px][py])^2+0.3*(DIFF_G[px][py])^2+0.2*(DIFF_B[px][py])^2