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Implement support for "Hung and Berns (1995)" "Constant Hue Loci Data".
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| # -*- coding: utf-8 -*- | ||
| """ | ||
| Constant Hue Loci Data - Hung and Berns (1995) | ||
| ============================================== | ||
| Defines the objects implementing support for *Hung and Berns (1995)* | ||
| *Constant Hue Loci Data* dataset loading: | ||
| - :class:`colour_datasets.loaders.Hung1995DatasetLoader` | ||
| - :func:`colour_datasets.loaders.build_Hung1995` | ||
| References | ||
| ---------- | ||
| - :cite:`Hung1995` : Hung, P.-C., & Berns, R. S. (1995). Determination of | ||
| constant Hue Loci for a CRT gamut and their predictions using color | ||
| appearance spaces. Color Research & Application, 20(5), 285–295. | ||
| doi:10.1002/col.5080200506 | ||
| """ | ||
|
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| from __future__ import division, unicode_literals | ||
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| import numpy as np | ||
| import os | ||
| from collections import OrderedDict, namedtuple | ||
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| from colour import ILLUMINANTS, xy_to_XYZ, xyY_to_XYZ | ||
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| from colour_datasets.records import datasets | ||
| from colour_datasets.loaders import AbstractDatasetLoader | ||
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| __author__ = 'Colour Developers' | ||
| __copyright__ = 'Copyright (C) 2019 - Colour Developers' | ||
| __license__ = 'New BSD License - https://opensource.org/licenses/BSD-3-Clause' | ||
| __maintainer__ = 'Colour Developers' | ||
| __email__ = '[email protected]' | ||
| __status__ = 'Production' | ||
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| __all__ = [ | ||
| 'ConstantPerceivedHueColourMatchesHung1995', 'Hung1995DatasetLoader', | ||
| 'build_Hung1995' | ||
| ] | ||
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| class ConstantPerceivedHueColourMatchesHung1995( | ||
| namedtuple('ConstantPerceivedHueColourMatchesHung1995', | ||
| ('name', 'XYZ_r', 'XYZ_cr', 'XYZ_ct', 'metadata'))): | ||
| """ | ||
| Defines *Hung and Berns (1995)* *Constant Hue Loci Data* | ||
| colour matches data for a given hue angle. | ||
| Parameters | ||
| ---------- | ||
| name : unicode | ||
| *Hung and Berns (1995)* *Constant Hue Loci Data* hue angle or | ||
| name. | ||
| XYZ_r : array_like | ||
| *CIE XYZ* tristimulus values of the reference illuminant. | ||
| XYZ_cr : array_like | ||
| *CIE XYZ* tristimulus values of the reference colour under the | ||
| reference illuminant. | ||
| XYZ_ct : array_like | ||
| *CIE XYZ* tristimulus values of the colour matches under the reference | ||
| illuminant. | ||
| metadata : dict | ||
| Dataset metadata. | ||
| """ | ||
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| class Hung1995DatasetLoader(AbstractDatasetLoader): | ||
| """ | ||
| Defines the *Hung and Berns (1995)* *Constant Hue Loci Data* | ||
| dataset loader. | ||
| Attributes | ||
| ---------- | ||
| ID | ||
| Methods | ||
| ------- | ||
| load | ||
| References | ||
| ---------- | ||
| :cite:`Hung1995` | ||
| """ | ||
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| ID = '3367463' | ||
| """ | ||
| Dataset record id, i.e. the *Zenodo* record number. | ||
| ID : unicode | ||
| """ | ||
|
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| def __init__(self): | ||
| super(Hung1995DatasetLoader, | ||
| self).__init__(datasets()[Hung1995DatasetLoader.ID]) | ||
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| def load(self): | ||
| """ | ||
| Syncs, parses, converts and returns the *Hung and Berns (1995)* | ||
| *Constant Hue Loci Data* dataset content. | ||
| Returns | ||
| ------- | ||
| OrderedDict | ||
| Dataset content as an :class:`OrderedDict` of :class:`OrderedDict` | ||
| of hue and their colour matches data. | ||
| Examples | ||
| -------- | ||
| >>> from colour_datasets.utilities import suppress_stdout | ||
| >>> dataset = Hung1995DatasetLoader() | ||
| >>> with suppress_stdout(): | ||
| ... dataset.load() | ||
| >>> len(dataset.data.keys()) | ||
| 6 | ||
| """ | ||
|
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| super(Hung1995DatasetLoader, self).sync() | ||
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| self._data = OrderedDict() | ||
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| filenames = OrderedDict([ | ||
| ('Table I.csv', 'Reference colors.'), | ||
| ('Table II.csv', 'Intra- and interobserver variances for each ' | ||
| 'reference hue expressed in circumferential ' | ||
| 'hue-angle difference.'), | ||
| ('Table III.csv', 'Weight-averaged constant hue loci for the CL ' | ||
| 'experiment.'), | ||
| ('Table IV.csv', 'Weight-averaged constant hue loci for the VL ' | ||
| 'experiment.'), | ||
| ]) | ||
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| for filename in filenames: | ||
| datafile_path = os.path.join(self.record.repository, 'dataset', | ||
| filename) | ||
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| self._data[filename.split('.')[0]] = np.genfromtxt( | ||
| datafile_path, | ||
| delimiter=',', | ||
| names=True, | ||
| dtype=None, | ||
| encoding='utf-8') | ||
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| hues = [ | ||
| 'Red', 'Red-yellow', 'Yellow', 'Yellow-green', 'Green', | ||
| 'Green-cyan', 'Cyan', 'Cyan-blue', 'Blue', 'Blue-magenta', | ||
| 'Magenta', 'Magenta-red' | ||
| ] | ||
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| XYZ_r = xy_to_XYZ( | ||
| ILLUMINANTS['CIE 1931 2 Degree Standard Observer']['C']) | ||
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| for table, experiment in [('Table III', 'CL'), ('Table IV', 'VL')]: | ||
| key = 'Constant Hue Loci - {0}'.format(experiment) | ||
| self._data[key] = OrderedDict() | ||
| for hue in hues: | ||
| for sample_r in self._data['Table I']: | ||
| sample_r = sample_r.tolist() | ||
| if sample_r[0] == hue: | ||
| XYZ_cr = xyY_to_XYZ(sample_r[1:4]) / 100 | ||
| break | ||
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| XYZ_ct = [] | ||
| metadata = { | ||
| 'Color name': [], | ||
| 'C*uv': [], | ||
| } | ||
| for sample_t in self._data[table]: | ||
| sample_t = sample_t.tolist() | ||
| if not sample_t[0] == hue: | ||
| continue | ||
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| XYZ_ct.append(sample_t[2:]) | ||
| metadata['Color name'].append(sample_t[0]) | ||
| metadata['C*uv'].append(sample_t[1]) | ||
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| self._data[key][hue] = ( | ||
| ConstantPerceivedHueColourMatchesHung1995( | ||
| hue, XYZ_r, XYZ_cr, | ||
| np.vstack(XYZ_ct) / 100, metadata)) | ||
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| return self._data | ||
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| _HUNG1995_DATASET_LOADER = None | ||
| """ | ||
| Singleton instance of the *Hung and Berns (1995)* | ||
| *Constant Hue Loci Data* dataset loader. | ||
| _HUNG1995_DATASET_LOADER : Hung1995DatasetLoader | ||
| """ | ||
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| def build_Hung1995(load=True): | ||
| """ | ||
| Singleton factory that builds the *Hung and Berns (1995)* | ||
| *Constant Hue Loci Data* dataset loader. | ||
| Parameters | ||
| ---------- | ||
| load : bool, optional | ||
| Whether to load the dataset upon instantiation. | ||
| Returns | ||
| ------- | ||
| Hung1995DatasetLoader | ||
| Singleton instance of the *Hung and Berns (1995)* | ||
| *Constant Hue Loci Data* dataset loader. | ||
| References | ||
| ---------- | ||
| :cite:`Hung1995` | ||
| """ | ||
|
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| global _HUNG1995_DATASET_LOADER | ||
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| if _HUNG1995_DATASET_LOADER is None: | ||
| _HUNG1995_DATASET_LOADER = Hung1995DatasetLoader() | ||
| if load: | ||
| _HUNG1995_DATASET_LOADER.load() | ||
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| return _HUNG1995_DATASET_LOADER |
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