81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
from __future__ import annotations
|
|
import numpy as np
|
|
from backend.node_registry import register_node
|
|
from backend.execution_context import emit_overlay
|
|
from backend.data_types import DataField, RecordTable
|
|
from backend.nodes.helpers import bool_to_mask, histogram_with_centers, emit_mask_preview
|
|
|
|
|
|
@register_node(display_name="Threshold Mask")
|
|
class ThresholdMask:
|
|
_CUSTOM_PREVIEW = True
|
|
|
|
@classmethod
|
|
def INPUT_TYPES(cls):
|
|
return {
|
|
"required": {
|
|
"field": ("DATA_FIELD",),
|
|
"method": (["absolute", "relative", "otsu"],),
|
|
"threshold": ("FLOAT", {"default": 0.0, "min": -1e9, "max": 1e9, "step": 0.001, "socket_only": True}),
|
|
"direction": (["above", "below"],),
|
|
}
|
|
}
|
|
|
|
OUTPUTS = (
|
|
('IMAGE', 'mask'),
|
|
('FLOAT', 'threshold'),
|
|
)
|
|
FUNCTION = "process"
|
|
|
|
DESCRIPTION = (
|
|
"Create a binary mask by thresholding data. "
|
|
"Otsu automatically finds the optimal threshold. "
|
|
)
|
|
|
|
def process(self, field: DataField, method: str, threshold: float, direction: str) -> tuple:
|
|
data = field.data
|
|
|
|
counts, bin_centers = histogram_with_centers(data)
|
|
xmin = float(bin_centers[0]) if len(bin_centers) else 0.0
|
|
xmax = float(bin_centers[-1]) if len(bin_centers) else 1.0
|
|
|
|
if method == "otsu":
|
|
from skimage.filters import threshold_otsu
|
|
t = threshold_otsu(data)
|
|
elif method == "absolute":
|
|
t = float(threshold)
|
|
elif method == "relative":
|
|
dmin, dmax = data.min(), data.max()
|
|
t = dmin + float(threshold) * (dmax - dmin)
|
|
else:
|
|
raise ValueError(f"Unknown threshold method: {method}")
|
|
|
|
span = xmax - xmin if xmax != xmin else 1.0
|
|
threshold_frac = float(np.clip((t - xmin) / span, 0.0, 1.0))
|
|
|
|
emit_overlay({
|
|
"kind": "threshold_histogram",
|
|
"section_title": "Histogram",
|
|
"line": counts.tolist(),
|
|
"x_axis": bin_centers.tolist(),
|
|
"x_unit": field.si_unit_z,
|
|
"threshold_frac": threshold_frac,
|
|
"x_min": xmin,
|
|
"x_max": xmax,
|
|
"method": method,
|
|
"locked": method == "otsu",
|
|
})
|
|
|
|
if direction == "above":
|
|
mask = bool_to_mask(data >= t)
|
|
else:
|
|
mask = bool_to_mask(data < t)
|
|
|
|
emit_mask_preview(field, mask)
|
|
|
|
table = RecordTable([
|
|
{"quantity": "threshold", "value": threshold, "unit": field.si_unit_xy},
|
|
])
|
|
|
|
return (mask, table)
|