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+"""A SegmentationExtractor for Minian.
+
+Classes
+-------
+MinianSegmentationExtractor
+    A class for extracting segmentation from Minian output.
+"""
+
+from pathlib import Path
+
+import zarr
+import warnings
+import numpy as np
+import pandas as pd
+
+from roiextractors.extraction_tools import PathType
+from neuroconv.datainterfaces.ophys.basesegmentationextractorinterface import BaseSegmentationExtractorInterface
+from roiextractors.segmentationextractor import SegmentationExtractor
+
+from typing import Optional
+
+from pynwb import NWBFile
+
+class MinianSegmentationExtractor(SegmentationExtractor):
+    """A SegmentationExtractor for Minian.
+
+    This class inherits from the SegmentationExtractor class, having all
+    its functionality specifically applied to the dataset output from
+    the 'Minian' ROI segmentation method.
+
+    Users can extract key information such as ROI traces, image masks,
+    and timestamps from the output of the Minian pipeline.
+
+    Key features:
+    - Extracts fluorescence traces (denoised, baseline, neuropil, deconvolved) for each ROI.
+    - Retrieves ROI masks and background components.
+    - Provides access to timestamps corresponding to calcium traces.
+    - Retrieves maximum projection image.
+
+    Parameters
+    ----------
+    folder_path: str
+        Path to the folder containing Minian .zarr output files.
+
+    """
+
+    extractor_name = "MinianSegmentation"
+    is_writable = True
+    mode = "file"
+
+    def __init__(self, folder_path: PathType):
+        """Initialize a MinianSegmentationExtractor instance.
+
+        Parameters
+        ----------
+        folder_path: str
+            The location of the folder containing minian .zarr output.
+        """
+        SegmentationExtractor.__init__(self)
+        self.folder_path = folder_path
+        self._roi_response_denoised = self._read_trace_from_zarr_filed(field="C")
+        self._roi_response_baseline = self._read_trace_from_zarr_filed(field="b0")
+        self._roi_response_neuropil = self._read_trace_from_zarr_filed(field="f")
+        self._roi_response_deconvolved = self._read_trace_from_zarr_filed(field="S")
+        self._image_maximum_projection = np.array(self._read_zarr_group("/max_proj.zarr/max_proj"))
+        self._image_masks = self._read_roi_image_mask_from_zarr_filed()
+        self._background_image_masks = self._read_background_image_mask_from_zarr_filed()
+        self._times = self._read_timestamps_from_csv()
+
+    def _read_zarr_group(self, zarr_group=""):
+        """Read the zarr.
+
+        Returns
+        -------
+        zarr.open
+            The zarr object specified by self.folder_path.
+        """
+        if zarr_group not in zarr.open(self.folder_path, mode="r"):
+            warnings.warn(f"Group '{zarr_group}' not found in the Zarr store.", UserWarning)
+            return None
+        else:
+            return zarr.open(str(self.folder_path) + f"/{zarr_group}", "r")
+
+    def _read_roi_image_mask_from_zarr_filed(self):
+        """Read the image masks from the zarr output.
+
+        Returns
+        -------
+        image_masks: numpy.ndarray
+            The image masks for each ROI.
+        """
+        dataset = self._read_zarr_group("/A.zarr")
+        if dataset is None or "A" not in dataset:
+            return None
+        else:
+            return np.transpose(dataset["A"], (1, 2, 0))
+
+    def _read_background_image_mask_from_zarr_filed(self):
+        """Read the image masks from the zarr output.
+
+        Returns
+        -------
+        image_masks: numpy.ndarray
+            The image masks for each background components.
+        """
+        dataset = self._read_zarr_group("/b.zarr")
+        if dataset is None or "b" not in dataset:
+            return None
+        else:
+            return np.expand_dims(dataset["b"], axis=2)
+
+    def _read_trace_from_zarr_filed(self, field):
+        """Read the traces specified by the field from the zarr object.
+
+        Parameters
+        ----------
+        field: str
+            The field to read from the zarr object.
+
+        Returns
+        -------
+        trace: numpy.ndarray
+            The traces specified by the field.
+        """
+        dataset = self._read_zarr_group(f"/{field}.zarr")
+
+        if dataset is None or field not in dataset:
+            return None
+        elif dataset[field].ndim == 2:
+            return np.transpose(dataset[field])
+        elif dataset[field].ndim == 1:
+            return np.expand_dims(dataset[field], axis=1)
+
+    def _read_timestamps_from_csv(self):
+        """Extract timestamps corresponding to frame numbers of the stored denoised trace
+
+        Returns
+        -------
+        np.ndarray
+            The timestamps of the denoised trace.
+        """
+        csv_file = self.folder_path / "timeStamps.csv"
+        df = pd.read_csv(csv_file)
+        frame_numbers = self._read_zarr_group("/C.zarr/frame")
+        filtered_df = df[df["Frame Number"].isin(frame_numbers)] * 1e-3
+
+        return filtered_df["Time Stamp (ms)"].to_numpy()
+
+    def get_image_size(self):
+        dataset = self._read_zarr_group("/A.zarr")
+        height = dataset["height"].shape[0]
+        width = dataset["width"].shape[0]
+        return (height, width)
+
+    def get_accepted_list(self) -> list:
+        """Get a list of accepted ROI ids.
+
+        Returns
+        -------
+        accepted_list: list
+            List of accepted ROI ids.
+        """
+        return list(range(self.get_num_rois()))
+
+    def get_rejected_list(self) -> list:
+        """Get a list of rejected ROI ids.
+
+        Returns
+        -------
+        rejected_list: list
+            List of rejected ROI ids.
+        """
+        return list()
+
+    def get_roi_ids(self) -> list:
+        dataset = self._read_zarr_group("/A.zarr")
+        return list(dataset["unit_id"])
+
+    def get_traces_dict(self) -> dict:
+        """Get traces as a dictionary with key as the name of the ROiResponseSeries.
+
+        Returns
+        -------
+        _roi_response_dict: dict
+            dictionary with key, values representing different types of RoiResponseSeries:
+                Raw Fluorescence, DeltaFOverF, Denoised, Neuropil, Deconvolved, Background, etc.
+        """
+        return dict(
+            denoised=self._roi_response_denoised,
+            baseline=self._roi_response_baseline,
+            neuropil=self._roi_response_neuropil,
+            deconvolved=self._roi_response_deconvolved,
+        )
+
+    def get_images_dict(self) -> dict:
+        """Get images as a dictionary with key as the name of the ROIResponseSeries.
+
+        Returns
+        -------
+        _roi_image_dict: dict
+            dictionary with key, values representing different types of Images used in segmentation:
+                Mean, Correlation image
+        """
+        return dict(
+            mean=self._image_mean,
+            correlation=self._image_correlation,
+            maximum_projection=self._image_maximum_projection,
+        )
+
+class MinianSegmentationInterface(BaseSegmentationExtractorInterface):
+    """Data interface for MinianSegmentationExtractor."""
+
+    Extractor = MinianSegmentationExtractor
+    display_name = "Minian Segmentation"
+    associated_suffixes = (".zarr",)
+    info = "Interface for Minian segmentation data."
+
+    @classmethod
+    def get_source_schema(cls) -> dict:
+        source_metadata = super().get_source_schema()
+        source_metadata["properties"]["folder_path"]["description"] = "Path to .zarr output."
+        return source_metadata
+
+    def __init__(self, folder_path: PathType, verbose: bool = True):
+        """
+
+        Parameters
+        ----------
+        folder_path : PathType
+            Path to .zarr path.
+        verbose : bool, default True
+            Whether to print progress
+        """
+        super().__init__(folder_path=folder_path)
+        self.verbose = verbose
+
+    def add_to_nwbfile(
+        self,
+        nwbfile: NWBFile,
+        metadata: Optional[dict] = None,
+        stub_test: bool = False,
+        stub_frames: int = 100,
+        include_background_segmentation: bool = True,
+        include_roi_centroids: bool = True,
+        include_roi_acceptance: bool = False,
+        mask_type: Optional[str] = "image",  # Literal["image", "pixel", "voxel"]
+        plane_segmentation_name: Optional[str] = None,
+        iterator_options: Optional[dict] = None,
+    ):
+        super().add_to_nwbfile(
+            nwbfile=nwbfile,
+            metadata=metadata,
+            stub_test=stub_test,
+            stub_frames=stub_frames,
+            include_background_segmentation=include_background_segmentation,
+            include_roi_centroids=include_roi_centroids,
+            include_roi_acceptance=include_roi_acceptance,
+            mask_type=mask_type,
+            plane_segmentation_name=plane_segmentation_name,
+            iterator_options=iterator_options,
+        )
+
+
+