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code39_reader.py
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code39_reader.py
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from PIL import Image
class Code39BarcodeReader:
CODE39_MAP = {
'1': '110100101011', '2': '101100101011', '3': '110110010101', '4': '101001101011',
'5': '110100110101', '6': '101100110101', '7': '101001011011', '8': '110100101101',
'9': '101100101101', '0': '101001101101', 'A': '110101001011', 'B': '101101001011',
'C': '110110100101', 'D': '101011001011', 'E': '110101100101', 'F': '101101100101',
'G': '101010011011', 'H': '110101001101', 'I': '101101001101', 'J': '101011001101',
'K': '110101010011', 'L': '101101010011', 'M': '110110101001', 'N': '101011010011',
'O': '110101101001', 'P': '101101101001', 'Q': '101010110011', 'R': '110101011001',
'S': '101101011001', 'T': '101011011001', 'U': '110010101011', 'V': '100110101011',
'W': '110011010101', 'X': '100101101011', 'Y': '110010110101', 'Z': '100110110101',
'-': '100101011011', '.': '110010101101', ' ': '100110101101', '*': '100101101101',
}
def __init__(self, filename):
self.filename = filename
self.barcodeImage = Image.open(self.filename)
self.image_width, self.image_height = self.barcodeImage.size
self.vertical_midpoint = self.image_height // 2
self.binary_string = ''
def decode(self):
self._convert_to_binary()
self._transform_binary_string()
self._remove_separator_zeros()
self._decode_binary_string()
return self.decoded_data
def _convert_to_binary(self):
barcodeBinary = []
lastChar = ''
for pixel in range(self.image_width-1):
r, g, b = self.barcodeImage.getpixel((pixel, self.vertical_midpoint))
if (r, g, b) == (255, 255, 255):
currentChar = '0'
elif (r, g, b) == (0, 0, 0):
currentChar = '1'
else:
continue
if currentChar != lastChar:
barcodeBinary.append(' ')
barcodeBinary.append(currentChar)
lastChar = currentChar
self.binary_string = ''.join(barcodeBinary)
def _transform_binary_string(self):
transformd_binary_string = self.binary_string.split(' ')
length_map = [{'length': len(i), 'binary': i} for i in transformd_binary_string]
# Normlaisation de la longueur
average_length = (max(i['length'] for i in length_map) + min(i['length'] for i in length_map)) // 2
length_map = [i for i in length_map if i['length'] >= average_length]
self.new_binary_string = ''.join([i['binary'][0] * (i['length'] // average_length) for i in length_map])
self.new_binary_string += '1'
def _remove_separator_zeros(self):
self.new_binary_string = ''.join([self.new_binary_string[i] for i in range(len(self.new_binary_string)) if (i + 1) % 13 != 0])
def _decode_binary_string(self):
CODE39_MAP_INVERTED = {v: k for k, v in self.CODE39_MAP.items()}
valid_segments = []
for i in range(0, len(self.new_binary_string), 12):
segment = self.new_binary_string[i:i+12]
if segment in CODE39_MAP_INVERTED:
valid_segments.append(segment)
self.decoded_data = ''.join(CODE39_MAP_INVERTED.get(seg, '?') for seg in valid_segments)