CrackCaptcha/preprocess.py at master · PyVilli/CrackCaptcha · GitHub

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from os.path import join, exists
import pickle
from PIL import Image
from captcha.image import ImageCaptcha
import numpy as np
import random
from os import makedirs
from config import *


def generate_captcha(captcha_text):
    """
    get captcha text and np array
    :param captcha_text: source text
    :return: captcha image and array
    """
    image = ImageCaptcha()
    captcha = image.generate(captcha_text)
    captcha_image = Image.open(captcha)
    captcha_array = np.array(captcha_image)
    return captcha_array


def text2vec(text):
    """
    text to one-hot vector
    :param text: source text
    :return: np array
    """
    if len(text) > CAPTCHA_LENGTH:
        return False
    vector = np.zeros(CAPTCHA_LENGTH * VOCAB_LENGTH)

    for i, c in enumerate(text):
        index = i * VOCAB_LENGTH + VOCAB.index(c)
        vector[index] = 1
    return vector


def vec2text(vector):
    """
    vector to captcha text
    :param vector: np array
    :return: text
    """
    if not isinstance(vector, np.ndarray):
        vector = np.asarray(vector)
    vector = np.reshape(vector, [CAPTCHA_LENGTH, -1])
    text = ''
    for item in vector:
        text += VOCAB[np.argmax(item)]
    return text


def get_random_text():
    text = ''
    for i in range(CAPTCHA_LENGTH):
        text += random.choice(VOCAB)
    return text


def generate_data():
    print('Generating Data...')
    data_x, data_y = [], []

    # generate data x and y
    for i in range(DATA_LENGTH):
        text = get_random_text()
        # get captcha array
        captcha_array = generate_captcha(text)
        # get vector
        vector = text2vec(text)
        data_x.append(captcha_array)
        data_y.append(vector)

    # write data to pickle
    if not exists(DATA_PATH):
        makedirs(DATA_PATH)

    x = np.asarray(data_x, np.float32)
    y = np.asarray(data_y, np.float32)
    with open(join(DATA_PATH, 'data.pkl'), 'wb') as f:
        pickle.dump(x, f)
        pickle.dump(y, f)


if __name__ == '__main__':
    vector = text2vec('1234')
    text = vec2text(vector)
    print(vector, text)