feat: add QC system for per-FOV metrics and policy checks

software/control/core/multi_point_utils.py

@@ -8,6 +8,7 @@
 from squid.abc import CameraFrame
 
 if TYPE_CHECKING:
+    from control.core.qc import FOVMetrics, PolicyDecision
     from control.slack_notifier import TimepointStats, AcquisitionStats
 
 
@@ -125,3 +126,6 @@ class MultiPointControllerFunctions:
     # Zarr frame written callback - called when subprocess completes writing a frame
     # Args: (fov, time_point, z_index, channel_name, region_idx)
     signal_zarr_frame_written: Callable[[int, int, int, str, int], None] = lambda *a, **kw: None
+    # QC callbacks
+    signal_qc_metrics_updated: Callable[["FOVMetrics"], None] = lambda *a, **kw: None
+    signal_qc_policy_decision: Callable[["PolicyDecision"], None] = lambda *a, **kw: None

software/control/core/multi_point_worker.py

@@ -55,6 +55,7 @@
     ensure_plate_resolution_in_well_resolutions,
 )
 from control.core.backpressure import BackpressureController, BackpressureValues
+from control.core.qc import QCConfig, QCJob, QCPolicy, QCPolicyConfig, QCResult, TimepointMetricsStore
 from squid.config import CameraPixelFormat
 
 # Module-level logger for static methods
@@ -86,6 +87,8 @@ def __init__(
         slack_notifier=None,
         prewarmed_job_runner: Optional[JobRunner] = None,
         prewarmed_bp_values: Optional["BackpressureValues"] = None,
+        qc_config: Optional[QCConfig] = None,
+        qc_policy_config: Optional[QCPolicyConfig] = None,
     ):
         self._log = squid.logging.get_logger(__class__.__name__)
         self._timing = utils.TimingManager("MultiPointWorker Timer Manager")
@@ -161,6 +164,10 @@ def __init__(
         self.num_fovs = 0
         self.total_scans = 0
         self._last_time_point_z_pos = {}
+        self._qc_config = qc_config or QCConfig()
+        self._qc_policy_config = qc_policy_config or QCPolicyConfig()
+        self._qc_policy = QCPolicy(self._qc_policy_config) if self._qc_policy_config.enabled else None
+        self._metrics_store: Optional[TimepointMetricsStore] = None
         self.scan_region_fov_coords_mm = (
             acquisition_parameters.scan_position_information.scan_region_fov_coords_mm.copy()
         )
@@ -370,6 +377,10 @@ def __init__(
                     # Subprocess starts warming up in background - don't block here
 
             self._job_runners.append((job_class, job_runner))
+
+        if self._qc_config.enabled:
+            self._job_runners.append((QCJob, None))
+
         self._abort_on_failed_job = abort_on_failed_jobs
         self._first_job_dispatched = False  # Track if we've waited for subprocess warmup
 
@@ -644,6 +655,8 @@ def run_single_time_point(self):
             self._timepoint_fov_count = 0
             self._laser_af_successes = 0
             self._laser_af_failures = 0
+            if self._qc_config.enabled:
+                self._metrics_store = TimepointMetricsStore(timepoint_index=self.time_point)
             self.microcontroller.enable_joystick(False)
 
             self._log.debug("multipoint acquisition - time point " + str(self.time_point + 1))
@@ -663,6 +676,19 @@ def run_single_time_point(self):
             with self._timing.get_timer("run_coordinate_acquisition"):
                 self.run_coordinate_acquisition(current_path)
 
+            # QC policy check
+            if self._qc_policy is not None and self._qc_policy_config.check_after_timepoint:
+                if self._metrics_store is not None:
+                    try:
+                        decision = self._qc_policy.check_timepoint(self._metrics_store)
+                        self.callbacks.signal_qc_policy_decision(decision)
+                        if decision.should_pause:
+                            # TODO: implement actual pause mechanism — currently advisory only,
+                            # the UI can react via signal_qc_policy_decision callback
+                            self._log.info(f"QC policy flagged {len(decision.flagged_fovs)} FOVs, requesting pause")
+                    except Exception as e:
+                        self._log.error(f"QC policy evaluation failed for timepoint {self.time_point}: {e}")
+
             # Save plate view for this timepoint
             if self._generate_downsampled_views and self._downsampled_view_manager is not None:
                 # Wait for pending downsampled view jobs to complete
@@ -678,6 +704,14 @@ def run_single_time_point(self):
             # finished region scan
             self.coordinates_pd.to_csv(os.path.join(current_path, "coordinates.csv"), index=False, header=True)
 
+            # Save QC metrics
+            if self._qc_config.enabled and self._metrics_store is not None:
+                qc_csv_path = os.path.join(current_path, "qc_metrics.csv")
+                try:
+                    self._metrics_store.save(qc_csv_path)
+                except OSError as e:
+                    self._log.error(f"Failed to save QC metrics to {qc_csv_path}: {e}")
+
             # Send Slack timepoint notification via callback (allows main thread to capture screenshot)
             if self._slack_notifier is not None:
                 try:
@@ -805,6 +839,18 @@ def _summarize_runner_outputs(self, drain_all: bool = False) -> SummarizeResult:
 
         return SummarizeResult(none_failed=none_failed, had_results=had_results)
 
+    def _handle_qc_result(self, qc_result: QCResult) -> None:
+        """Store QC metrics and emit signal."""
+        if qc_result.error:
+            self._log.error(
+                f"QC metric calculation failed for region={qc_result.metrics.fov_id.region_id} "
+                f"fov={qc_result.metrics.fov_id.fov_index}: {qc_result.error}"
+            )
+        # Always store metrics (positional data is valid even on partial failure)
+        if self._metrics_store is not None:
+            self._metrics_store.add(qc_result.metrics)
+        self.callbacks.signal_qc_metrics_updated(qc_result.metrics)
+
     def _summarize_job_result(self, job_result: JobResult) -> bool:
         """
         Prints a summary, then returns True if the result was successful or False otherwise.
@@ -833,6 +879,9 @@ def _summarize_job_result(self, job_result: JobResult) -> bool:
             elif isinstance(job_result.result, ZarrWriteResult):
                 r = job_result.result
                 self.callbacks.signal_zarr_frame_written(r.fov, r.time_point, r.z_index, r.channel_name, r.region_idx)
+            # Handle QCResult - store metrics and emit signal
+            elif isinstance(job_result.result, QCResult):
+                self._handle_qc_result(job_result.result)
             return True
 
     def _handle_downsampled_view_result(self, result: DownsampledViewResult) -> None:
@@ -888,9 +937,25 @@ def _create_job(self, job_class: Type[Job], info: CaptureInfo, image: np.ndarray
         """
         if job_class == DownsampledViewJob:
             return self._create_downsampled_view_job(info, image)
+        elif job_class == QCJob:
+            return self._create_qc_job(info, image)
         else:
             return job_class(capture_info=info, capture_image=JobImage(image_array=image))
 
+    def _create_qc_job(self, info: CaptureInfo, image: np.ndarray) -> QCJob:
+        """Create a QCJob for the given capture."""
+        previous_z = None
+        if self._qc_config.calculate_z_diff_from_last_timepoint and self.time_point > 0:
+            fov_key = (info.region_id, info.fov)
+            if fov_key in self._last_time_point_z_pos:
+                previous_z = self._last_time_point_z_pos[fov_key] * 1000  # mm -> um
+        return QCJob(
+            capture_info=info,
+            capture_image=JobImage(image_array=image),
+            qc_config=self._qc_config,
+            previous_timepoint_z=previous_z,
+        )
+
     def _create_downsampled_view_job(self, info: CaptureInfo, image: np.ndarray) -> Optional[DownsampledViewJob]:
         """Create a DownsampledViewJob for the given capture.
 
@@ -1424,9 +1489,9 @@ def _image_callback(self, camera_frame: CameraFrame):
                                 return
                         else:
                             try:
-                                # NOTE(imo): We don't have any way of people using results, so for now just
-                                # grab and ignore it.
                                 result = job.run()
+                                if isinstance(result, QCResult):
+                                    self._handle_qc_result(result)
                             except Exception:
                                 self._log.exception("Failed to execute job, abandoning acquisition!")
                                 self.request_abort_fn()