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