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import numpy as np
def _make_frame(r, g, b, motion=0.0, luminance=140.0):
return {
"rois": {
"forehead": {"r": r, "g": g, "b": b},
"left_cheek": {"r": r + 0.5, "g": g + 0.3, "b": b + 0.2},
"right_cheek": {"r": r - 0.3, "g": g - 0.2, "b": b - 0.1},
},
"motion": motion,
"luminance": luminance,
}
def _run_synthetic_session(
hr_bpm,
drift_bpm=48.0,
drift_amp=0.0,
pulse_amp=2.0,
fps=30,
duration=20,
include_background=False,
):
sp = SignalProcessor(fps=fps)
rng = np.random.default_rng(1)
result = None
for i in range(fps * duration):
t = i / fps
pulse = np.sin(2 * np.pi * (hr_bpm / 60.0) * t)
drift = drift_amp * np.sin(2 * np.pi * (drift_bpm / 60.0) * t + 0.5)
r = 140.0 + drift + 0.8 * pulse_amp * pulse + 0.2 * rng.normal()
g = (
142.0
+ drift
+ pulse_amp * np.sin(2 * np.pi * (hr_bpm / 60.0) * t + 0.3)
+ 0.2 * rng.normal()
)
b = (
138.0
+ drift
+ 0.4 * pulse_amp * np.sin(2 * np.pi * (hr_bpm / 60.0) * t + 0.6)
+ 0.2 * rng.normal()
)
frame = _make_frame(r, g, b, motion=0.1, luminance=(r + g + b) / 3.0)
if include_background:
frame["background"] = {
"r": 100.0 + drift + 0.2 * rng.normal(),
"g": 102.0 + drift + 0.2 * rng.normal(),
"b": 98.0 + drift + 0.2 * rng.normal(),
}
sp.last_compute_time = -999
result = sp.process(frame)
return result
def test_buffering_status_before_enough_samples():
sp = SignalProcessor(fps=30)
for i in range(100):
result = sp.process(_make_frame(140.0, 142.0, 138.0))
assert result["status"] == "buffering"
assert result["bpm"] == 0
def test_bpm_detection_72bpm(sine_wave_72bpm):
sp = SignalProcessor(fps=30)
result = None
for r, g, b in sine_wave_72bpm:
sp.last_compute_time = -999
res = sp.process(_make_frame(float(r), float(g), float(b)))
result = res
assert result is not None
assert 65 <= result["bpm"] <= 80
def test_bpm_detection_90bpm(sine_wave_90bpm):
sp = SignalProcessor(fps=30)
result = None
for r, g, b in sine_wave_90bpm:
sp.last_compute_time = -999
res = sp.process(_make_frame(float(r), float(g), float(b)))
result = res
assert result is not None
assert 83 <= result["bpm"] <= 100
def test_bpm_detection_resists_common_illumination_drift():
result = _run_synthetic_session(hr_bpm=90.0, drift_amp=4.0)
assert result is not None
assert result["status"] == "measuring"
assert 83 <= result["bpm"] <= 100
def test_bpm_detection_resists_moderate_drift_across_common_heart_rates():
for hr_bpm in (80.0, 90.0, 100.0):
result = _run_synthetic_session(hr_bpm=hr_bpm, drift_amp=4.0)
assert result is not None
assert result["status"] == "measuring"
assert hr_bpm - 7 <= result["bpm"] <= hr_bpm + 7
def test_extreme_drift_returns_poor_signal_instead_of_false_low_bpm():
result = _run_synthetic_session(hr_bpm=90.0, drift_amp=8.0)
assert result is not None
assert result["status"] == "poor_signal"
assert result["bpm"] == 0
def test_background_reference_cancels_extreme_common_drift():
result = _run_synthetic_session(hr_bpm=90.0, drift_amp=8.0, include_background=True)
assert result is not None
assert result["status"] == "measuring"
assert 83 <= result["bpm"] <= 100
def test_response_includes_methods_dict():
sp = SignalProcessor(fps=30)
fps = 30
t = np.linspace(0, 15, fps * 15)
freq = 72.0 / 60.0
for i in range(fps * 15):
r = 140.0 + 2.0 * np.sin(2 * np.pi * freq * t[i])
g = 142.0 + 4.0 * np.sin(2 * np.pi * freq * t[i] + 0.3)
b = 138.0 + 1.0 * np.sin(2 * np.pi * freq * t[i] + 0.6)
sp.last_compute_time = -999
result = sp.process(_make_frame(r, g, b))
assert "methods" in result
for method_name in ("green", "chrom", "pos", "gr", "grgb"):
assert method_name in result["methods"]
assert "bpm" in result["methods"][method_name]
assert "snr" in result["methods"][method_name]
def test_response_includes_best_method():
sp = SignalProcessor(fps=30)
fps = 30
t = np.linspace(0, 15, fps * 15)
freq = 72.0 / 60.0
for i in range(fps * 15):
r = 140.0 + 2.0 * np.sin(2 * np.pi * freq * t[i])
g = 142.0 + 4.0 * np.sin(2 * np.pi * freq * t[i] + 0.3)
b = 138.0 + 1.0 * np.sin(2 * np.pi * freq * t[i] + 0.6)
sp.last_compute_time = -999
result = sp.process(_make_frame(r, g, b))
assert "best_method" in result
assert result["best_method"] in ("green", "chrom", "pos", "gr", "grgb")
def test_response_includes_diagnostics():
result = _run_synthetic_session(hr_bpm=90.0, drift_amp=4.0)
assert result is not None
assert "diagnostics" in result
assert result["diagnostics"]["effective_fps"] > 0
assert result["diagnostics"]["artifact_bpm"] >= 0
assert result["diagnostics"]["artifact_score"] >= 0
assert result["diagnostics"]["usable_methods"] >= 0
def test_response_includes_motion():
sp = SignalProcessor(fps=30)
sp.last_compute_time = -999
result = sp.process(_make_frame(140.0, 142.0, 138.0, motion=0.5))
assert "motion" in result
def test_high_motion_suppresses_reading():
sp = SignalProcessor(fps=30)
fps = 30
t = np.linspace(0, 15, fps * 15)
freq = 72.0 / 60.0
for i in range(fps * 15):
r = 140.0 + 2.0 * np.sin(2 * np.pi * freq * t[i])
g = 142.0 + 4.0 * np.sin(2 * np.pi * freq * t[i] + 0.3)
b = 138.0 + 1.0 * np.sin(2 * np.pi * freq * t[i] + 0.6)
motion = 5.0 if i > fps * 10 else 0.1
sp.last_compute_time = -999
result = sp.process(_make_frame(r, g, b, motion=motion))
assert result["confidence"] < 0.3 or result["status"] == "poor_signal"
def test_waveform_length_capped():
sp = SignalProcessor(fps=30)
fps = 30
t = np.linspace(0, 20, fps * 20)
freq = 72.0 / 60.0
for i in range(fps * 20):
r = 140.0 + 2.0 * np.sin(2 * np.pi * freq * t[i])
g = 142.0 + 4.0 * np.sin(2 * np.pi * freq * t[i] + 0.3)
b = 138.0 + 1.0 * np.sin(2 * np.pi * freq * t[i] + 0.6)
sp.last_compute_time = -999
sp.process(_make_frame(r, g, b))
sp.last_compute_time = -999
last = sp.process(_make_frame(r, g, b))
assert len(last["waveform"]) <= 450
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