55 lines
2.2 KiB
Python
55 lines
2.2 KiB
Python
import numpy as np
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from backend.data_types import LineData
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from backend.node_registry import get_node_info
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from tests.node_tests._shared import make_field
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def test_line_correction():
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from backend.nodes.line_correction import LineCorrection
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node = LineCorrection()
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assert get_node_info("LineCorrection")["category"] == "Level & Correct"
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rows = 96
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cols = 128
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y = np.linspace(0.0, 1.0, rows, dtype=np.float64)
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x = np.linspace(-1.0, 1.0, cols, dtype=np.float64)
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signal = (
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0.15 * np.sin(8.0 * np.pi * x)[None, :]
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+ 0.05 * np.cos(4.0 * np.pi * y)[:, None]
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)
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row_offsets = 1.5 * np.sin(3.0 * np.pi * y) + 0.25 * np.cos(7.0 * np.pi * y)
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field = make_field(data=signal + row_offsets[:, None], xreal=2.5e-6, yreal=1.5e-6)
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corrected, background, shifts = node.process(
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field, method="median", direction="horizontal", masking="ignore",
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trim_fraction=0.05, polynomial_degree=1,
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)
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expected_shifts = row_offsets - row_offsets.mean()
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assert corrected.data.shape == field.data.shape
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assert background.data.shape == field.data.shape
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assert np.allclose(corrected.data + background.data, field.data)
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assert isinstance(shifts, LineData)
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assert shifts.x_unit == field.si_unit_xy
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assert shifts.y_unit == field.si_unit_z
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assert np.isclose(shifts.x_axis[0], 0.0)
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assert np.isclose(shifts.x_axis[-1], field.yreal)
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assert np.corrcoef(shifts.data, expected_shifts)[0, 1] > 0.999
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assert corrected.data.mean(axis=1).std() < field.data.mean(axis=1).std() * 0.03
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poly_background = (
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row_offsets[:, None]
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+ (0.35 * y - 0.15)[:, None] * x[None, :]
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+ (0.10 + 0.05 * y)[:, None] * (x[None, :] ** 2)
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)
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poly_signal = 0.08 * np.sin(10.0 * np.pi * x)[None, :] * (1.0 + 0.15 * np.cos(2.0 * np.pi * y)[:, None])
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poly_field = make_field(data=poly_signal + poly_background)
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leveled, poly_bg, poly_shifts = node.process(
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poly_field, method="polynomial", direction="horizontal", masking="ignore",
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trim_fraction=0.05, polynomial_degree=2,
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)
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assert np.allclose(leveled.data + poly_bg.data, poly_field.data)
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assert np.corrcoef(leveled.data.ravel(), poly_signal.ravel())[0, 1] > 0.995
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assert len(poly_shifts) == rows
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