{
"image_path": "testdata/ringgrid.png",
"polarity": "Dark",
"radius_hint": 12.0,
"frst": {
"radii": [8, 10, 12, 14, 16],
"alpha": 2.0,
"gradient_threshold": 2.0,
"smoothing_factor": 0.5
},
"nms": {
"radius": 12,
"threshold": 0.01,
"max_detections": 60
}
}