adding more nodes

backend/nodes/scan_line_reorder.py

@@ -0,0 +1,58 @@
+"""Scan line reordering — fix meander, interlace, and deinterlace artifacts."""
+
+from __future__ import annotations
+
+import numpy as np
+
+from backend.node_registry import register_node
+from backend.data_types import DataField
+
+
+@register_node(display_name="Scan Line Reorder")
+class ScanLineReorder:
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "field": ("DATA_FIELD",),
+                "operation": (["reverse_odd", "reverse_even", "deinterlace_odd",
+                               "deinterlace_even", "flip_vertical"], {"default": "reverse_odd"}),
+            }
+        }
+
+    OUTPUTS = (
+        ('DATA_FIELD', 'result'),
+    )
+    FUNCTION = "process"
+
+    DESCRIPTION = (
+        "Fix scan line ordering artifacts. reverse_odd/even reverses alternate "
+        "rows to correct meander (serpentine) scanning. deinterlace selects only "
+        "odd or even rows and stretches to fill. flip_vertical reverses row order. "
+    )
+
+    def process(self, field: DataField, operation: str) -> tuple:
+        data = np.asarray(field.data, dtype=np.float64).copy()
+        yres, xres = data.shape
+
+        if operation == "reverse_odd":
+            data[1::2, :] = data[1::2, ::-1]
+        elif operation == "reverse_even":
+            data[0::2, :] = data[0::2, ::-1]
+        elif operation == "deinterlace_odd":
+            odd_rows = data[1::2, :]
+            # Stretch back to original height via linear interpolation
+            from scipy.ndimage import zoom
+            scale_y = yres / odd_rows.shape[0]
+            data = zoom(odd_rows, (scale_y, 1.0), order=1)
+        elif operation == "deinterlace_even":
+            even_rows = data[0::2, :]
+            from scipy.ndimage import zoom
+            scale_y = yres / even_rows.shape[0]
+            data = zoom(even_rows, (scale_y, 1.0), order=1)
+        elif operation == "flip_vertical":
+            data = data[::-1, :].copy()
+        else:
+            raise ValueError(f"Unknown operation: {operation!r}")
+
+        return (field.replace(data=data),)