簡單的Tensorflow驗證碼識別應用，供大家參考，具體內容如下

1.Tensorflow的安裝方式簡單,在此就不贅述了.

2.訓練集訓練集以及測試及如下(純手工打造,所以數量不多):

3.實現代碼部分(參考了網上的一些實現來完成的)

main.py(主要的神經網絡代碼)

from gen_check_code import gen_captcha_text_and_image_new,gen_captcha_text_and_imagefrom gen_check_code import numberfrom test_check_code import get_test_captcha_text_and_imageimport numpy as npimport tensorflow as tftext, image = gen_captcha_text_and_image_new()print("驗證碼圖像channel:", image.shape) # (60, 160, 3) # 圖像大小 IMAGE_HEIGHT = image.shape[0]IMAGE_WIDTH = image.shape[1]image_shape = image.shapeMAX_CAPTCHA = len(text)print("驗證碼文本最長字符數", MAX_CAPTCHA) # 驗證碼最長4字符; 我全部固定為4,可以不固定. 如果驗證碼長度小于4，用'_'補齊# 把彩色圖像轉為灰度圖像（色彩對識別驗證碼沒有什么用）# 度化是將三分量轉化成一樣數值的過程def convert2gray(img): if len(img.shape) > 2:  gray = np.mean(img, -1)  # 上面的轉法較快，正規轉法如下   # r, g, b = img[:,:,0], img[:,:,1], img[:,:,2]   # gray = 0.2989 * r + 0.5870 * g + 0.1140 * b  # int gray = (int) (0.3 * r + 0.59 * g + 0.11 * b);  return gray else:  return img""" cnn在圖像大小是2的倍數時性能最高, 如果你用的圖像大小不是2的倍數，可以在圖像邊緣補無用像素。 np.pad(image,((2,3),(2,2)), 'constant', constant_values=(255,)) # 在圖像上補2行，下補3行，左補2行，右補2行 """char_set = number # 如果驗證碼長度小于4, '_'用來補齊CHAR_SET_LEN = len(char_set)# 文本轉向量def text2vec(text): text_len = len(text) if text_len > MAX_CAPTCHA:  raise ValueError('驗證碼最長4個字符') vector = np.zeros(MAX_CAPTCHA * CHAR_SET_LEN) def char2pos(c):  try:   k = ord(c)-ord('0')  except:   raise ValueError('No Map')  return k for i, c in enumerate(text):  idx = i * CHAR_SET_LEN + char2pos(c)  vector[idx] = 1 return vector# 向量轉回文本def vec2text(vec): char_pos = vec.nonzero()[0] text = [] for i, c in enumerate(char_pos):  char_at_pos = i # c/63  char_idx = c % CHAR_SET_LEN  if char_idx < 10:   char_code = char_idx + ord('0')  elif char_idx < 36:   char_code = char_idx - 10 + ord('A')  elif char_idx < 62:   char_code = char_idx - 36 + ord('a')  elif char_idx == 62:   char_code = ord('_')  else:   raise ValueError('error')  text.append(chr(char_code)) return "".join(text)# 生成一個訓練batchdef get_next_batch(batch_size=128): batch_x = np.zeros([batch_size, IMAGE_HEIGHT * IMAGE_WIDTH]) batch_y = np.zeros([batch_size, MAX_CAPTCHA * CHAR_SET_LEN]) # 有時生成圖像大小不是(60, 160, 3)  def wrap_gen_captcha_text_and_image():  while True:   text, image = gen_captcha_text_and_image_new()   if image.shape == image_shape:    return text, image for i in range(batch_size):  text, image = wrap_gen_captcha_text_and_image()  image = convert2gray(image)  batch_x[i, :] = image.flatten() / 255 # (image.flatten()-128)/128 mean為0  batch_y[i, :] = text2vec(text) return batch_x, batch_y####################################################################X = tf.placeholder(tf.float32, [None, IMAGE_HEIGHT * IMAGE_WIDTH])Y = tf.placeholder(tf.float32, [None, MAX_CAPTCHA * CHAR_SET_LEN])keep_prob = tf.placeholder(tf.float32) # dropout# 定義CNNdef crack_captcha_cnn(w_alpha=0.01, b_alpha=0.1): x = tf.reshape(X, shape=[-1, IMAGE_HEIGHT, IMAGE_WIDTH, 1]) # w_c1_alpha = np.sqrt(2.0/(IMAGE_HEIGHT*IMAGE_WIDTH)) # # w_c2_alpha = np.sqrt(2.0/(3*3*32)) # w_c3_alpha = np.sqrt(2.0/(3*3*64)) # w_d1_alpha = np.sqrt(2.0/(8*32*64)) # out_alpha = np.sqrt(2.0/1024) # 定義三層的卷積神經網絡 # 定義第一層的卷積神經網絡 # 定義第一層權重 w_c1 = tf.Variable(w_alpha * tf.random_normal([3, 3, 1, 32])) # 定義第一層的偏置 b_c1 = tf.Variable(b_alpha * tf.random_normal([32])) # 定義第一層的激勵函數 conv1 = tf.nn.relu(tf.nn.bias_add(tf.nn.conv2d(x, w_c1, strides=[1, 1, 1, 1], padding='SAME'), b_c1)) # conv1 為輸入 ksize 表示使用2*2池化，即將2*2的色塊轉化成1*1的色塊 conv1 = tf.nn.max_pool(conv1, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME') # dropout防止過擬合。 conv1 = tf.nn.dropout(conv1, keep_prob) # 定義第二層的卷積神經網絡 w_c2 = tf.Variable(w_alpha * tf.random_normal([3, 3, 32, 64])) b_c2 = tf.Variable(b_alpha * tf.random_normal([64])) conv2 = tf.nn.relu(tf.nn.bias_add(tf.nn.conv2d(conv1, w_c2, strides=[1, 1, 1, 1], padding='SAME'), b_c2)) conv2 = tf.nn.max_pool(conv2, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME') conv2 = tf.nn.dropout(conv2, keep_prob) # 定義第三層的卷積神經網絡 w_c3 = tf.Variable(w_alpha * tf.random_normal([3, 3, 64, 64])) b_c3 = tf.Variable(b_alpha * tf.random_normal([64])) conv3 = tf.nn.relu(tf.nn.bias_add(tf.nn.conv2d(conv2, w_c3, strides=[1, 1, 1, 1], padding='SAME'), b_c3)) conv3 = tf.nn.max_pool(conv3, ksize=[1, 2, 2, 1], strides=[1, 2, 2, 1], padding='SAME') conv3 = tf.nn.dropout(conv3, keep_prob) # Fully connected layer # 隨機生成權重 w_d = tf.Variable(w_alpha * tf.random_normal([1536, 1024])) # 隨機生成偏置 b_d = tf.Variable(b_alpha * tf.random_normal([1024])) dense = tf.reshape(conv3, [-1, w_d.get_shape().as_list()[0]]) dense = tf.nn.relu(tf.add(tf.matmul(dense, w_d), b_d)) dense = tf.nn.dropout(dense, keep_prob) w_out = tf.Variable(w_alpha * tf.random_normal([1024, MAX_CAPTCHA * CHAR_SET_LEN])) b_out = tf.Variable(b_alpha * tf.random_normal([MAX_CAPTCHA * CHAR_SET_LEN])) out = tf.add(tf.matmul(dense, w_out), b_out) # out = tf.nn.softmax(out) return out# 訓練def train_crack_captcha_cnn(): # X = tf.placeholder(tf.float32, [None, IMAGE_HEIGHT * IMAGE_WIDTH]) # Y = tf.placeholder(tf.float32, [None, MAX_CAPTCHA * CHAR_SET_LEN]) # keep_prob = tf.placeholder(tf.float32) # dropout output = crack_captcha_cnn() # loss  # loss = tf.reduce_mean(tf.nn.softmax_cross_entropy_with_logits(output, Y)) loss = tf.reduce_mean(tf.nn.sigmoid_cross_entropy_with_logits(output, Y)) # 最后一層用來分類的softmax和sigmoid有什么不同？ # optimizer 為了加快訓練 learning_rate應該開始大，然后慢慢衰  optimizer = tf.train.AdamOptimizer(learning_rate=0.001).minimize(loss) predict = tf.reshape(output, [-1, MAX_CAPTCHA, CHAR_SET_LEN]) max_idx_p = tf.argmax(predict, 2) max_idx_l = tf.argmax(tf.reshape(Y, [-1, MAX_CAPTCHA, CHAR_SET_LEN]), 2) correct_pred = tf.equal(max_idx_p, max_idx_l) accuracy = tf.reduce_mean(tf.cast(correct_pred, tf.float32)) saver = tf.train.Saver() with tf.Session() as sess:   sess.run(tf.global_variables_initializer())   step = 0   while True:    batch_x, batch_y = get_next_batch(64)    _, loss_ = sess.run([optimizer, loss], feed_dict={X: batch_x, Y: batch_y, keep_prob: 0.75})    print(step, loss_)    # 每100 step計算一次準確率    if step % 100 == 0:     batch_x_test, batch_y_test = get_next_batch(100)     acc = sess.run(accuracy, feed_dict={X: batch_x_test, Y: batch_y_test, keep_prob: 1.})     print(step, acc)     # 如果準確率大于50%,保存模型,完成訓練     if acc > 0.99:      saver.save(sess, "./crack_capcha.model", global_step=step)      break    step += 1## 訓練(如果要訓練則去掉下面一行的注釋)train_crack_captcha_cnn()def crack_captcha(): output = crack_captcha_cnn() saver = tf.train.Saver() with tf.Session() as sess:  saver.restore(sess, tf.train.latest_checkpoint('.'))  predict = tf.argmax(tf.reshape(output, [-1, MAX_CAPTCHA, CHAR_SET_LEN]), 2)  count = 0  # 因為測試集共40個...寫的很草率  for i in range(40):   text, image = get_test_captcha_text_and_image(i)   image = convert2gray(image)   captcha_image = image.flatten() / 255   text_list = sess.run(predict, feed_dict={X: [captcha_image], keep_prob: 1})   predict_text = text_list[0].tolist()   predict_text = str(predict_text)   predict_text = predict_text.replace("[", "").replace("]", "").replace(",", "").replace(" ","")   if text == predict_text:    count += 1    check_result = "，預測結果正確"   else:    check_result = "，預測結果不正確"    print("正確: {} 預測: {}".format(text, predict_text) + check_result)  print("正確率:" + str(count) + "/40")# 測試(如果要測試則去掉下面一行的注釋)# crack_captcha()