Perkin Elmer file reader

MANIFEST.in

@@ -7,6 +7,7 @@ recursive-include orangecontrib/spectroscopy/datasets emsc/*
 recursive-include orangecontrib/spectroscopy/datasets NeaReaderGSF_test/*
 recursive-include orangecontrib/spectroscopy/datasets renishaw_test_files/*
 recursive-include orangecontrib/spectroscopy/datasets photothermal/*
+recursive-include orangecontrib/spectroscopy/datasets perkinelmer/*
 
 global-exclude __pycache__
 

orangecontrib/spectroscopy/io/__init__.py

@@ -17,6 +17,7 @@
 from .opus import OPUSReader
 from .ptir import PTIRFileReader
 from .wire import WiREReaders
+from .perkinelmer import PerkinElmerReader
 
 # Facility-specific readers
 from .diamond import NXS_STXM_Diamond_I08

orangecontrib/spectroscopy/io/perkinelmer.py

@@ -0,0 +1,165 @@
+import os
+
+import numpy as np
+
+from Orange.data import Table, Domain, FileFormat
+
+from orangecontrib.spectroscopy.io.util import SpectralFileFormat, _spectra_from_image_2d
+from orangecontrib.spectroscopy.utils.specio.specio import BlockReader, PerkinElmer
+
+# This code is partially based on software developed in the Diamond synchrotron.
+
+
+class PerkinElmerReader(FileFormat, SpectralFileFormat):
+    EXTENSIONS = (".sp", ".fsm",)
+    DESCRIPTION = "Perkin Elmer"
+
+    def read_sp(self):
+        with open(self.filename, "rb") as f:
+            data = f.read()
+
+        reader = BlockReader(data)
+
+        info = {
+            "signature": reader.read(4, format="utf-8"),
+            "description": reader.read(40, format="utf-8"),
+        }
+
+        decoders = {
+            25739: PerkinElmer.decode25739,
+            35698: PerkinElmer.decode35698,
+            35699: PerkinElmer.decode35699,
+            35700: PerkinElmer.decode35700,
+            35701: PerkinElmer.decode35701,
+            35708: PerkinElmer.decode35708,
+        }
+
+        stops = []
+        spectrum = []
+
+        block_id, block_size = reader.read(6,
+                                           format="<Hi",
+                                           expect_tuple=True)
+
+        stops.append(reader.start + block_size)
+
+        while block_id != 122 and not reader.atEnd(2):
+            next_block_id = reader.peek(2)
+
+            if next_block_id[1] == 117:
+                reader.start = stops[-1]
+                stops = stops[:-1]
+
+                while reader.start >= stops[-1]:
+                    stops = stops[:-1]
+
+            else:
+                block_id, block_size = reader.read(6,
+                                                   format="<Hi",
+                                                   expect_tuple=True)
+
+                stops.append(reader.start + block_size)
+
+        info.update(PerkinElmer.decode5104(reader.read(block_size)))
+
+        reader.start = stops[1]
+
+        while not reader.atEnd():
+            block_id, block_size = reader.read(6,
+                                               format="<Hi",
+                                               expect_tuple=True)
+
+            if block_id in decoders:
+                decoded = decoders[block_id](reader.peek(block_size))
+
+                if isinstance(decoded, dict):
+                    info.update(decoded)
+
+                else:
+                    spectrum = decoded
+
+            reader.start += block_size
+
+        wavenumbers = np.linspace(info['min_wavelength'],
+                                  info['max_wavelength'],
+                                  info['n_points'])
+
+        datavals = np.array(spectrum)[None, ...]
+
+        domain = Domain([], None)
+        meta_data = Table.from_numpy(domain,
+                                     X=np.zeros((len(datavals), 0)))
+
+        meta_data.attributes = info
+
+        return wavenumbers, datavals, meta_data
+
+    def read_fsm(self):
+        with open(self.filename, "rb") as f:
+            data = f.read()
+
+        reader = BlockReader(data)
+
+        meta = {
+            "signature": reader.read(4, format="utf-8"),
+            "description": reader.read(40, format="utf-8"),
+        }
+
+        decoders = {
+            5100: PerkinElmer.decode5100,
+            5104: PerkinElmer.decode5104,
+            5105: PerkinElmer.decode5105,
+        }
+
+        spectrum = []
+
+        while not reader.atEnd(6):
+            block_id, block_size = reader.read(6,
+                                               format="<Hi",
+                                               expect_tuple=True)
+
+            decoded = decoders[block_id](reader.read(block_size))
+
+            if isinstance(decoded, dict):
+                meta.update(decoded)
+            else:
+                spectrum.append(decoded)
+
+        wavenumbers = np.arange(meta['z_start'],
+                                meta['z_end'] + meta['z_delta'],
+                                meta['z_delta'])
+
+        datavals = np.squeeze(spectrum)
+
+        domain = Domain([], None)
+        meta_data = Table.from_numpy(domain,
+                                     X=np.zeros((len(datavals), 0)))
+
+        meta_data.attributes = meta
+
+        return datavals, wavenumbers, meta_data
+
+    def read_spectra(self):
+        if os.path.splitext(self.filename)[1].lower() == ".sp":
+            return self.read_sp()
+
+        elif os.path.splitext(self.filename)[1].lower() == ".fsm":
+            intensities, wn, m = self.read_fsm()
+
+            atts = m.attributes
+            # TODO position calculation should be done by a helper function that accepts units as well
+            xpositions = atts['x_init'] + atts['x_delta'] * np.arange(atts['n_x'])
+            ypositions = atts['y_init'] + atts['y_delta'] * np.arange(atts['n_y'])
+
+            # TODO this is not nice - we need new helpers to build the coordinates
+            y_loc = np.repeat(np.arange(atts['n_y']), atts['n_x'])
+            x_loc = np.tile(np.arange(atts['n_x']), atts['n_y'])
+
+            features, final_data, locs_table = _spectra_from_image_2d(intensities, wn,
+                                                                      xpositions[x_loc],
+                                                                      ypositions[y_loc])
+
+            return features, final_data, locs_table
+
+        else:
+            raise IOError("File can't be read: unsupported file type.")

orangecontrib/spectroscopy/tests/test_readers.py

@@ -224,6 +224,21 @@ def disabled_test_map_reader(self):
         self.assertEqual(max(getx(d)), 2787.509766)
 
 
+class TestPerkinElmerReader(unittest.TestCase):
+
+    def test_single_sp_reader(self):
+        d = Orange.data.Table("perkinelmer/single_PE_spectrum.sp")
+        self.assertEqual(d.X[0][4], 100.65028381347656)
+        self.assertEqual(min(getx(d)), 750.0)
+        self.assertEqual(max(getx(d)), 4000.0)
+
+    def test_map_reader(self):
+        d = Orange.data.Table("perkinelmer/4x4_pixel_PE_image.fsm")
+        self.assertEqual(d.X[3][4], 92.9105453491211)
+        self.assertEqual(min(getx(d)), 750.0)
+        self.assertEqual(max(getx(d)), 4000.0)
+
+
 class TestAgilentReader(unittest.TestCase):
 
     def test_image_read(self):

orangecontrib/spectroscopy/utils/specio/README.txt

@@ -0,0 +1,2 @@
+This code is based on work done in the specio package. The code has been refactored by colleagues at the
+Diamond synchrotron.