add letters (load data letters froms images) and pnmimage (load pbm/pgm) modules
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13422b8977
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__init__.py
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__init__.py
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letters.py
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letters.py
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import os
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from pnmimage import PnmImage
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class LettersData(object):
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def __init__(self, data_folder="data/", filename_expected_data="list_expected_data.txt", car_filename_fmt="ext_ln{}_car{}.pgm"):
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self.filename_expected_data = filename_expected_data
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self.car_filename_fmt = car_filename_fmt
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self.data_folder = data_folder
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self.expected_data_list = []
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self.expected_letters = []
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self.letter_to_int = {}
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self.letters_classes = {}
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self.extract_vocab = []
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self.vocab = {}
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self._images = []
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self._expected_values = []
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self.nb_vocab = 0
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self.input_image_size = 0
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self.selection_vocab = {}
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self.selection_batch = []
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self.letter_to_vector = {}
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self.vector_to_letter = {}
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def _gen_ext_filenames_list(self):
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for ln in range(100):
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for car in range(100):
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n = self.data_folder + self.car_filename_fmt.format(ln, car)
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if os.path.exists(n) and n.replace(data_folder, '') in self.filenames_list:
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yield(n)
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def _get_expected_letters_list(self):
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"""Get expected letters list from expected data file.
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:return: list of tuples with the letter and the corresponding filename
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"""
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data_list = []
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name = self.filename_expected_data
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with open(name) as f:
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lst = [(line.split(" ")[0], line.split(" ", 1)[1].replace('\n', '')) for line in f.readlines() if line.strip() != '']
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# list of tuples with (letter, filename)
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data_list = [(e[1], e[0]) for e in lst]
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return data_list
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def _extract_data(self):
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"""Extract data.
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Create list of expected letters/filenames, base letters with info, classes.
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"""
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self.expected_data_list = self._get_expected_letters_list()
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"""list of tuples with letter and filename"""
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self.extract_vocab = sorted(set([l[0] for l in self.expected_data_list]))
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"""list of data vocab letters sorted"""
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self.nb_vocab = len(self.extract_vocab)
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self.vocab = {}
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letters_list = [l[0] for l in self.expected_data_list]
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for i, c in enumerate(self.extract_vocab):
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vec = [0] * self.nb_vocab
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vec[i] = 1
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self.vocab[c] = {
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'index': i,
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'count': letters_list.count(c),
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'vector': vec
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}
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self.letter_to_int = {c: i for i, c in enumerate(self.extract_vocab)}
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"""dict of letters with index of each"""
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self.letters_classes = {}
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"""dict of letters with vector representation of each letter"""
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for letter, idx in self.letter_to_int.items():
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cls = [0] * self.nb_vocab
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cls[idx] = 1
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self.letters_classes[letter] = cls
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def get_vocab_with_min_count(self, min_count):
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"""Get the vocab. A dictionary of letters with count, index and vector.
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The index is re-computed and also the vector to match the number of subelements
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"""
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subvocab = {}
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i = 0
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for c, info in self.vocab.items():
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if info['count'] >= min_count:
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subvocab[c] = {
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'count': info['count'],
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'index': i,
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'vector': None
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}
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i += 1
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nb_vocab = len(subvocab)
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self.letter_to_vector = {}
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self.vector_to_letter = {}
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for c in subvocab:
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vec = [0] * nb_vocab
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vec[subvocab[c]['index']] = 1
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subvocab[c]['vector'] = vec
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self.letter_to_vector[c] = vec
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return subvocab
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def get_letter_of_vector(self, vector):
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"""Get the letter corresponding to a given vector.
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:return: the found letter else None
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"""
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ret = None
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for letter, vec in self.letter_to_vector.items():
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if vec == vector:
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ret = letter
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break
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return ret
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def get_batches(self, min_count=0, mini_batch_size=None):
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"""Get the selection data based on min count of letters in the dataset
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:param min_count: minimal count of same letters to be added (default 0 for the whole dataset)
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:param mini_batch_size: size of a mini batch, if None the whole dataset size (default None)
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if whole size is not factor of the mini batch size then the last mini batch
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has a size < mini batch size
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:return: a list of mini batches (at least list of one)
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"""
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if mini_batch_size is None:
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mini_batch_size = len(self.expected_data_list)
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self.selection_vocab = self.get_vocab_with_min_count(min_count)
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self.selection_batch = []
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X = []
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Y = []
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bsize = 0
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for letter, name in self.expected_data_list:
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path = '{}{}'.format(self.data_folder, name)
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if letter in self.selection_vocab:
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img = PnmImage()
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if img.load(path) == False:
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print("ERROR: failed to open '{}'".format(path))
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image_size = img.get_size()
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bsize += 1
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X.append(img.get_data_bin())
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Y.append(self.selection_vocab[letter]['vector'])
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if bsize >= mini_batch_size:
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self.selection_batch.append((X, Y))
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X = []
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Y = []
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bsize = 0
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if bsize > 0:
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self.selection_batch.append((X, Y))
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return self.selection_batch
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def process(self):
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self._extract_data()
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def get_data_with_min_count(self, min_count):
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vocab = self.get_vocab_with_min_count(min_count)
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#todo
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return images, expected_values
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def get_vocab(self):
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"""Get the vocab. A dictionary of letters with count, index and vector"""
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return self.vocab
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def get_classes(self):
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return self.letters_classes
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def get_class_element_size(self):
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return self.nb_vocab
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def get_input_image_size(self):
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return self.input_image_size
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136
pnmimage.py
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pnmimage.py
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import struct
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class PnmImage(object):
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def __init__(self):
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self._filename = None
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self._image = []
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self._version = None
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self._maxval = None
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self._width = 0
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self._height = 0
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def reset(self):
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"""Reset all image data (dims, data,...)"""
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self._filename = None
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self._image = []
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self._version = None
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self._maxval = None
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self._width = 0
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self._height = 0
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def _load_bin_pbm(self, fd):
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"""Load image data from a file of PBM binary format
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:param fd: file descriptor of the file starting to the image data so
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the version and dimensions should have been skipped
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"""
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c = fd.read(1)
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i = 0
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size = self._width * self._height
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while len(c) > 0:
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c = struct.unpack("<B", c)[0]
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# each byte is a bit array of 8 pixels
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for b in range(8):
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if c & 128:
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self._image.append(1)
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else:
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self._image.append(0)
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c <<= 1
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i += 1
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if i >= size:
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break
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if i >= size:
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break
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c = fd.read(1)
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def _load_bin_pgm(self, fd):
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"""Load image data from a file of PGM binary format
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:param fd: file descriptor of the file starting to the image data so
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the version and dimensions should have been skipped
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"""
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maxval = fd.readline().decode("utf-8").strip()
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self._maxval = int(maxval)
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c = fd.read(1)
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while len(c) > 0:
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c = struct.unpack("<B", c)[0]
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self._image.append(c)
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c = fd.read(1)
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def load(self, filename):
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"""Load an image pnm. Managed formats: P4, P5
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:param filename: the image's file name
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:return: False if failed to open the file
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"""
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ret = True
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try:
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fd = open(filename, 'rb')
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except IOError:
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ret = False
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else:
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with fd:
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self.reset()
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self._filename = filename
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self._version = fd.readline().decode("utf-8").strip()
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c = fd.read(1).decode("utf-8")
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if c == "#":
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comment = fd.readline().decode("utf-8").rstrip()
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#print("#{}".format(comment))
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c = ""
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dims = c + fd.readline().decode("utf-8").strip()
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width, height = dims.split(" ")
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self._width = int(width)
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self._height = int(height)
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if self._version == "P5":
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self._load_bin_pgm(fd)
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elif self._version == "P4":
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self._load_bin_pbm(fd)
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return ret
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def get_data(self):
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"""Get the image data in a 1D list"""
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return self._image
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def get_data_bin(self, threshold=125):
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"""Get the image data in a 1D list"""
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return [1 if e < threshold else 0 for e in self._image]
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def get_info(self):
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"""Get the image information
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:return: information in a dict with keys: "version", "dims", "size", "max_value"
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"""
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info = {
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"version": self._version,
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"dims": (self._width, self._height),
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"size": len(self._image),
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"max_value": self._maxval
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}
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return info
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def get_size(self):
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return len(self._image)
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def show_image_info(self):
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print("file: {}".format(self._filename))
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print("version: {}".format(self._version))
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print("dims: {}x{} (={})".format(self._width, self._height, self._width*self._height))
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print("image size: {}".format(len(self._image)))
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print("max val : {}".format(self._maxval))
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print("5 first pixels: {}".format(self._image[:5]))
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print("5 last pixels: {}".format(self._image[-5:]))
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if __name__ == "__main__":
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img = PnmImage()
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img.load("data/ext_ln0_car0.pgm")
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img.show_image_info()
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print()
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img.load("mc_p22.pgm")
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img.show_image_info()
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print()
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img.load("tst.pbm")
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img.show_image_info()
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