TensorFlow 实现车牌识别_tensorflow训练车牌识别模型

1：生成训练数据集

#pip install pillow  -i https://pypi.tuna.tsinghua.edu.cn/simple
#pip install opencv-python -i https://pypi.tuna.tsinghua.edu.cn/simple
import PIL
from PIL import ImageFont
from PIL import Image
from PIL import ImageDraw
import cv2;
import numpy as np;
import os;
from math import *
import matplotlib.pyplot as plt

index = {"京": 0, "沪": 1, "津": 2, "渝": 3, "冀": 4, "晋": 5, "蒙": 6, "辽": 7, "吉": 8, "黑": 9, "苏": 10, "浙": 11, "皖": 12,
         "闽": 13, "赣": 14, "鲁": 15, "豫": 16, "鄂": 17, "湘": 18, "粤": 19, "桂": 20, "琼": 21, "川": 22, "贵": 23, "云": 24,
         "藏": 25, "陕": 26, "甘": 27, "青": 28, "宁": 29, "新": 30, "0": 31, "1": 32, "2": 33, "3": 34, "4": 35, "5": 36,
         "6": 37, "7": 38, "8": 39, "9": 40, "A": 41, "B": 42, "C": 43, "D": 44, "E": 45, "F": 46, "G": 47, "H": 48,
         "J": 49, "K": 50, "L": 51, "M": 52, "N": 53, "P": 54, "Q": 55, "R": 56, "S": 57, "T": 58, "U": 59, "V": 60,
         "W": 61, "X": 62, "Y": 63, "Z": 64};

chars = ["京", "沪", "津", "渝", "冀", "晋", "蒙", "辽", "吉", "黑", "苏", "浙", "皖", "闽", "赣", "鲁", "豫", "鄂", "湘", "粤", "桂",
             "琼", "川", "贵", "云", "藏", "陕", "甘", "青", "宁", "新", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",
             "B", "C", "D", "E", "F", "G", "H", "J", "K", "L", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X",
             "Y", "Z"
             ];

def GenCh(f,val):
    # 生成中文字符
    img=Image.new("RGB", (45,70),(255,255,255))
    draw = ImageDraw.Draw(img)
    draw.text((0, 3),val,(0,0,0),font=f)
    img =  img.resize((23,70))
    A = np.array(img)
    return A

def GenCh1(f,val):
    # 生成英文字符
    img=Image.new("RGB", (23,70),(255,255,255))
    draw = ImageDraw.Draw(img)
    draw.text((0, 2),val.encode('utf-8').decode('unicode_escape'),(0,0,0),font=f)
    A = np.array(img)
    return A

def AddSmudginess(img, Smu):
    rows = r(Smu.shape[0] - 50)
    cols = r(Smu.shape[1] - 50)
    adder = Smu[rows:rows + 50, cols:cols + 50];
    adder = cv2.resize(adder, (50, 50));
    img = cv2.resize(img,(50,50))
    img = cv2.bitwise_not(img)
    img = cv2.bitwise_and(adder, img)
    img = cv2.bitwise_not(img)
    return img


def rot(img,angel,shape,max_angel):
    # 添加仿射变。img表示输入图像，factor表示畸变的参数，size表示图片的目标尺寸。
    size_o = [shape[1],shape[0]]
    size = (shape[1]+ int(shape[0]*cos((float(max_angel )/180) * 3.14)),shape[0])
    interval = abs( int( sin((float(angel) /180) * 3.14)* shape[0]));
    pts1 = np.float32([[0,0],[0,size_o[1]],[size_o[0],0],[size_o[0],size_o[1]]])
    if(angel>0):
        pts2 = np.float32([[interval,0],[0,size[1]  ],[size[0],0  ],[size[0]-interval,size_o[1]]])
    else:
        pts2 = np.float32([[0,0],[interval,size[1]  ],[size[0]-interval,0  ],[size[0],size_o[1]]])
    M  = cv2.getPerspectiveTransform(pts1,pts2);
    dst = cv2.warpPerspective(img,M,size);
    return dst

def rotRandrom(img, factor, size):
    # 添加透视变换
    shape = size;
    pts1 = np.float32([[0, 0], [0, shape[0]], [shape[1], 0], [shape[1], shape[0]]])
    pts2 = np.float32([[r(factor), r(factor)], [ r(factor), shape[0] - r(factor)], [shape[1] - r(factor),  r(factor)],
                       [shape[1] - r(factor), shape[0] - r(factor)]])
    M = cv2.getPerspectiveTransform(pts1, pts2);
    dst = cv2.warpPerspective(img, M, size);
    return dst

def tfactor(img):
    # 添加饱和度光照的噪声
    hsv = cv2.cvtColor(img,cv2.COLOR_BGR2HSV);
    hsv[:,:,0] = hsv[:,:,0]*(0.8+ np.random.random()*0.2);
    hsv[:,:,1] = hsv[:,:,1]*(0.3+ np.random.random()*0.7);
    hsv[:,:,2] = hsv[:,:,2]*(0.2+ np.random.random()*0.8);

    img = cv2.cvtColor(hsv,cv2.COLOR_HSV2BGR);
    return img

def random_envirment(img,data_set):
    # 添加自然环境的噪声
    index=r(len(data_set))
    env = cv2.imread(data_set[index])
    env = cv2.resize(env,(img.shape[1],img.shape[0]))
    bak = (img==0);
    bak = bak.astype(np.uint8)*255;
    inv = cv2.bitwise_and(bak,env)
    img = cv2.bitwise_or(inv,img)
    return img

def AddGauss(img, level):
    # 添加高斯模糊
    return cv2.blur(img, (level * 2 + 1, level * 2 + 1));

def r(val):
    return int(np.random.random() * val)

def AddNoiseSingleChannel(single):
    # 添加高斯噪声
    diff = 255-single.max();
    noise = np.random.normal(0,1+r(6),single.shape);
    noise = (noise - noise.min())/(noise.max()-noise.min())
    noise= diff*noise;
    noise= noise.astype(np.uint8)
    dst = single + noise
    return dst

def addNoise(img,sdev = 0.5,avg=10):
    img[:,:,0] =  AddNoiseSingleChannel(img[:,:,0]);
    img[:,:,1] =  AddNoiseSingleChannel(img[:,:,1]);
    img[:,:,2] =  AddNoiseSingleChannel(img[:,:,2]);
    return img

class GenPlate:
    def __init__(self,fontCh,fontEng,NoPlates):
        self.fontC =  ImageFont.truetype(fontCh,43,0);
        self.fontE =  ImageFont.truetype(fontEng,60,0);
        self.img=np.array(Image.new("RGB", (226,70),(255,255,255)))
        self.bg  = cv2.resize(cv2.imread("./images/template.bmp"),(226,70));
        self.smu = cv2.imread("./images/smu2.jpg");
        self.noplates_path = [];
        for parent,parent_folder,filenames in os.walk(NoPlates):
            for filename in filenames:
                path = parent+"/"+filename;
                self.noplates_path.append(path);
    def draw(self,val):
        offset= 2 ;
        self.img[0:70,offset+8:offset+8+23]= GenCh(self.fontC,val[0]);
        self.img[0:70,offset+8+23+6:offset+8+23+6+23]= GenCh1(self.fontE,val[1]);
        for i in range(5):
            base = offset+8+23+6+23+17 +i*23 + i*6 ;
            self.img[0:70, base  : base+23]= GenCh1(self.fontE,val[i+2]);
        return self.img
    def generate(self,text):
        if len(text) == 7:
            fg = self.draw(text.encode('utf-8').decode(encoding="utf-8"));
            fg = cv2.bitwise_not(fg);
            com = cv2.bitwise_or(fg,self.bg);
            com = rot(com,r(60)-30,com.shape,30);
            com = rotRandrom(com,10,(com.shape[1],com.shape[0]));
            com = tfactor(com)
            com = random_envirment(com,self.noplates_path);
            com = AddGauss(com, 1+r(4));
            com = addNoise(com);
            return com
    def genPlateString(self,pos,val):
        # 生成车牌string,将其以图片形式保存
        plateStr = "";
        box = [0,0,0,0,0,0,0];
        if(pos!=-1):
            box[pos]=1;
        for unit,cpos in zip(box,range(len(box))):
            if unit == 1:
                plateStr += val
            else:
                if cpos == 0:
                    plateStr += chars[r(31)]
                elif cpos == 1:
                    plateStr += chars[41+r(24)]
                else:
                    plateStr += chars[31 + r(34)]

        return plateStr;
    # 将生成的车牌图片写入文件夹
    def genBatch(self, batchSize,pos,charRange, outputPath,size):
        if (not os.path.exists(outputPath)):
            os.mkdir(outputPath)
        for i in range(batchSize):
                plateStr = G.genPlateString(-1,-1)
                img =  G.generate(plateStr);
                img = cv2.resize(img,size);
                plt.imshow(img)
                cv2.imwrite(outputPath + "/" + str(i).zfill(2) + ".jpg", img);
G = GenPlate("./font/platech.ttf",'./font/platechar.ttf',"./NoPlates")
G.genBatch(15,2,range(31,65),"./plate",(272,72)) #在每次其他模块运行时，若导入该库，则刷新该函数
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2：数据读取

import numpy as np
import cv2
from genplate import *

#产生用于训练的数据
class OCRIter():
    def __init__(self,batch_size,height,width):
        super(OCRIter, self).__init__()
        self.genplate = GenPlate("./font/platech.ttf",'./font/platechar.ttf','./NoPlates')
        self.batch_size = batch_size
        self.height = height
        self.width = width
        #print("make plate data")

#    def iter(self):
#        for k in range((int)(self.count / self.batch_size)):
#            data = []
#            label = []
#            for i in range(self.batch_size):
#                num, img = gen_sample(self.genplate, self.width, self.height)
#                data.append(img)
#                label.append(num)
#            data_all = data
#            label_all = label
#        return data_all,label_all

    def iter(self):
        data = []
        label = []
        for i in range(self.batch_size):
            num, img = gen_sample(self.genplate, self.width, self.height)
            data.append(img)
            label.append(num)
        data_all = data
        label_all = label
        return data_all,label_all


def rand_range(lo,hi):
    return lo+r(hi-lo);


def gen_rand():
    name = ""
    label=[]
    label.append(rand_range(0,31))  #产生车牌开头32个省的标签
    label.append(rand_range(41,65)) #产生车牌第二个字母的标签
    for i in range(5):
        label.append(rand_range(31,65)) #产生车牌后续5个字母的标签

    name+=chars[label[0]]
    name+=chars[label[1]]
    for i in range(5):
        name+=chars[label[i+2]]
    return name,label

def gen_sample(genplate, width, height):
    num,label =gen_rand()
    img = genplate.generate(num)
    img = cv2.resize(img,(width,height))
    img = np.multiply(img,1/255.0) #[height,width,channel]
    #img = img.transpose(2,0,1)
    #img = img.transpose(1,0,2)
    return label,img        #返回的label为标签，img为深度为3的图像像素
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3：构建神经网络模型

import tensorflow as tf
import numpy as np

def inference (images,keep_prob):
    # 第1层卷积层
    with tf.variable_scope('conv1') as scope:
        weights = tf.get_variable('weights',
                                  shape = [3,3,3,32],
                                  dtype = tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.1,dtype=tf.float32))
        conv = tf.nn.conv2d(images,weights,strides=[1,1,1,1],padding='VALID')
        biases = tf.get_variable('biases',
                                 shape=[32],
                                 dtype=tf.float32,
                                 initializer=tf.constant_initializer(0.1))
        pre_activation = tf.nn.bias_add(conv,biases)
        conv1 = tf.nn.relu(pre_activation,name= scope.name)

    # 第2层卷积层
    with tf.variable_scope('conv2') as scope:
        weights = tf.get_variable('weights',shape=[3,3,32,32],dtype=tf.float32,initializer=tf.truncated_normal_initializer(stddev=0.1,dtype=tf.float32))
        conv = tf.nn.conv2d(conv1,weights,strides=[1,1,1,1],padding='VALID')
        biases = tf.get_variable('biases',
                                 shape=[32],
                                 dtype=tf.float32,
                                 initializer=tf.constant_initializer(0.1))
        pre_activation = tf.nn.bias_add(conv,biases)
        conv2 = tf.nn.relu(pre_activation,name= scope.name)
    # 池化层1，进行最大池化操作
    with tf.variable_scope('max_pooling1') as scope:
        pool1 = tf.nn.max_pool(conv2,ksize = [1,2,2,1],strides= [1,2,2,1],padding='VALID',name='pooling1')

    # 第3层卷积层
    with tf.variable_scope('conv3') as scope:
        weights = tf.get_variable('weights',shape=[3,3,32,64],dtype=tf.float32,initializer=tf.truncated_normal_initializer(stddev=0.1,dtype=tf.float32))
        conv = tf.nn.conv2d(pool1,weights,strides=[1,1,1,1],padding='VALID')
        biases = tf.get_variable('biases',shape=[64],dtype = tf.float32,initializer= tf.constant_initializer(0.1))
        pre_activation = tf.nn.bias_add(conv,biases)
        conv3 = tf.nn.relu(pre_activation,name=scope.name)

    # 第4层卷积层
    with tf.variable_scope('conv4') as scope:
        weights = tf.get_variable('weights',shape=[3,3,64,64],dtype=tf.float32,initializer=tf.truncated_normal_initializer(stddev=0.1,dtype=tf.float32))
        conv =tf.nn.conv2d(conv3,weights,strides=[1,1,1,1],padding='VALID')
        biases = tf.get_variable('biases',shape=[64],dtype=tf.float32,initializer=tf.constant_initializer(0.1))
        pre_activation = tf.nn.bias_add(conv,biases)
        conv4 = tf.nn.relu(pre_activation,name=scope.name)
    # 池化层2，进行最大池化操作
    with tf.variable_scope('max_pooling2') as scope:
        pool2 = tf.nn.max_pool(conv4,ksize=[1,2,2,1],strides=[1,2,2,1],padding='VALID',name='pooling2')

    # 第5层卷积层
    with tf.variable_scope('conv5') as scope:
        weights = tf.get_variable('weights',shape=[3,3,64,128],dtype=tf.float32,initializer=tf.truncated_normal_initializer(stddev=0.1,dtype=tf.float32))
        conv =tf.nn.conv2d(pool2,weights,strides=[1,1,1,1],padding='VALID')
        biases = tf.get_variable('biases',shape=[128],dtype=tf.float32,initializer=tf.constant_initializer(0.1))
        pre_activation = tf.nn.bias_add(conv,biases)
        conv5 = tf.nn.relu(pre_activation,name=scope.name)

    # 第6层卷积层
    with tf.variable_scope('conv6') as scope:
        weights = tf.get_variable('weights',shape=[3,3,128,128],dtype=tf.float32,initializer=tf.truncated_normal_initializer(stddev=0.1,dtype=tf.float32))
        conv =tf.nn.conv2d(conv5,weights,strides=[1,1,1,1],padding='VALID')
        biases = tf.get_variable('biases',shape=[128],dtype=tf.float32,initializer=tf.constant_initializer(0.1))
        pre_activation = tf.nn.bias_add(conv,biases)
        conv6 = tf.nn.relu(pre_activation,name=scope.name)

    # 池化层3，进行最大池化操作
    with tf.variable_scope('max_pool3') as scope:
         pool3 = tf.nn.max_pool(conv6,ksize=[1,2,2,1],strides=[1,2,2,1],padding='VALID',name='pool3')

    with tf.variable_scope('fc1') as scope:
        shp = pool3.get_shape()
        flattened_shape =shp[1].value*shp[2].value*shp[3].value
        reshape = tf.reshape(pool3,[-1,flattened_shape])
        fc1 = tf.nn.dropout(reshape,keep_prob,name='fc1_dropdot')

    with tf.variable_scope('fc21') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc21 = tf.matmul(fc1,weights)+biases
    with tf.variable_scope('fc22') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc22 = tf.matmul(fc1,weights)+biases
    with tf.variable_scope('fc23') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc23= tf.matmul(fc1,weights)+biases
    with tf.variable_scope('fc24') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc24 = tf.matmul(fc1,weights)+biases
    with tf.variable_scope('fc25') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc25 = tf.matmul(fc1,weights)+biases
    with tf.variable_scope('fc26') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc26 = tf.matmul(fc1,weights)+biases
    with tf.variable_scope('fc27') as scope:
        weights = tf.get_variable('weights',
                                  shape=[flattened_shape,65],
                                  dtype=tf.float32,
                                  initializer=tf.truncated_normal_initializer(stddev=0.005,dtype=tf.float32))

        biases = tf.get_variable('biases',
                                 shape=[65],
                                 dtype=tf.float32,
                                 initializer = tf.truncated_normal_initializer(0.1)
                                 )
        fc27 = tf.matmul(fc1,weights)+biases

    return fc21,fc22,fc23,fc24,fc25,fc26,fc27    

def losses(logits1,logits2,logits3,logits4,logits5,logits6,logits7,labels):
    '''Compute loss from logits and labels
    Args:
        logits: logits tensor, float, [7*batch_size, 65]
        labels: label tensor, tf.int32, [7*batch_size]

    Returns:
        loss tensor of float type
    '''
    labels = tf.convert_to_tensor(labels,tf.int32)

    with tf.variable_scope('loss1') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits1, labels=labels[:,0], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss1 = tf.reduce_mean(cross_entropy, name='loss1')
        tf.summary.scalar(scope.name+'/loss1', loss1)

    with tf.variable_scope('loss2') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits2, labels=labels[:,1], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss2 = tf.reduce_mean(cross_entropy, name='loss2')
        tf.summary.scalar(scope.name+'/loss2', loss2)

    with tf.variable_scope('loss3') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits3, labels=labels[:,2], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss3 = tf.reduce_mean(cross_entropy, name='loss3')
        tf.summary.scalar(scope.name+'/loss3', loss3)

    with tf.variable_scope('loss4') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits4, labels=labels[:,3], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss4 = tf.reduce_mean(cross_entropy, name='loss4')
        tf.summary.scalar(scope.name+'/loss4', loss4)

    with tf.variable_scope('loss5') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits5, labels=labels[:,4], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss5 = tf.reduce_mean(cross_entropy, name='loss5')
        tf.summary.scalar(scope.name+'/loss5', loss5)

    with tf.variable_scope('loss6') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits6, labels=labels[:,5], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss6 = tf.reduce_mean(cross_entropy, name='loss6')
        tf.summary.scalar(scope.name+'/loss6', loss6)

    with tf.variable_scope('loss7') as scope:
        cross_entropy = tf.nn.sparse_softmax_cross_entropy_with_logits(logits=logits7, labels=labels[:,6], name='xentropy_per_example')
        #cross_entropy = tf.nn.softmax_cross_entropy_with_logits(logits=logits,labels=labels,name='xentropy_per_example')
        loss7 = tf.reduce_mean(cross_entropy, name='loss7')
        tf.summary.scalar(scope.name+'/loss7', loss7)

    return loss1,loss2,loss3,loss4,loss5,loss6,loss7

def trainning( loss1,loss2,loss3,loss4,loss5,loss6,loss7, learning_rate):
    '''Training ops, the Op returned by this function is what must be passed to
        'sess.run()' call to cause the model to train.

    Args:
        loss: loss tensor, from losses()

    Returns:
        train_op: The op for trainning
    '''
    with tf.name_scope('optimizer1'):
        optimizer1 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op1 = optimizer1.minimize(loss1, global_step= global_step)
    with tf.name_scope('optimizer2'):
        optimizer2 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op2 = optimizer2.minimize(loss2, global_step= global_step)
    with tf.name_scope('optimizer3'):
        optimizer3 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op3 = optimizer3.minimize(loss3, global_step= global_step)
    with tf.name_scope('optimizer4'):
        optimizer4 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op4 = optimizer4.minimize(loss4, global_step= global_step)
    with tf.name_scope('optimizer5'):
        optimizer5 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op5 = optimizer5.minimize(loss5, global_step= global_step)
    with tf.name_scope('optimizer6'):
        optimizer6 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op6 = optimizer6.minimize(loss6, global_step= global_step)
    with tf.name_scope('optimizer7'):
        optimizer7 = tf.train.AdamOptimizer(learning_rate= learning_rate)
        global_step = tf.Variable(0, name='global_step', trainable=False)
        train_op7 = optimizer7.minimize(loss7, global_step= global_step)

    return train_op1,train_op2,train_op3,train_op4,train_op5,train_op6,train_op7

def evaluation(logits1,logits2,logits3,logits4,logits5,logits6,logits7,labels):
  """Evaluate the quality of the logits at predicting the label.
  Args:
    logits: Logits tensor, float - [batch_size, NUM_CLASSES].
    labels: Labels tensor, int32 - [batch_size], with values in the
      range [0, NUM_CLASSES).
  Returns:
    A scalar int32 tensor with the number of examples (out of batch_size)
    that were predicted correctly.
  """
  logits_all = tf.concat([logits1,logits2,logits3,logits4,logits5,logits6,logits7],0)
  labels = tf.convert_to_tensor(labels,tf.int32)
  labels_all = tf.reshape(tf.transpose(labels),[-1])
  with tf.variable_scope('accuracy') as scope:
      correct = tf.nn.in_top_k(logits_all, labels_all, 1)
      correct = tf.cast(correct, tf.float16)
      accuracy = tf.reduce_mean(correct)
      tf.summary.scalar(scope.name+'/accuracy', accuracy)
  return accuracy
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4：开始训练模型

#%%
import os
import numpy as np
import tensorflow as tf
from input_data import OCRIter
import model
import time
import datetime
tf.reset_default_graph()
img_w = 272
img_h = 72
num_label=7
batch_size = 8
count = 30000
learning_rate = 0.0001

#默认参数[N,H,W,C]
image_holder = tf.placeholder(tf.float32,[batch_size,img_h,img_w,3])
label_holder = tf.placeholder(tf.int32,[batch_size,7])
keep_prob = tf.placeholder(tf.float32)

logs_train_dir = (r'.\train_result')

def get_batch():
    data_batch = OCRIter(batch_size,img_h,img_w)
    image_batch,label_batch = data_batch.iter()

    image_batch1 = np.array(image_batch)
    label_batch1 = np.array(label_batch)
    return image_batch1,label_batch1


train_logits1,train_logits2,train_logits3,train_logits4,train_logits5,train_logits6,train_logits7= model.inference(image_holder,keep_prob)

train_loss1,train_loss2,train_loss3,train_loss4,train_loss5,train_loss6,train_loss7 = model.losses(train_logits1,train_logits2,train_logits3,train_logits4,train_logits5,train_logits6,train_logits7,label_holder)
train_op1,train_op2,train_op3,train_op4,train_op5,train_op6,train_op7 = model.trainning(train_loss1,train_loss2,train_loss3,train_loss4,train_loss5,train_loss6,train_loss7,learning_rate)

train_acc = model.evaluation(train_logits1,train_logits2,train_logits3,train_logits4,train_logits5,train_logits6,train_logits7,label_holder)

input_image=tf.summary.image('input',image_holder)
#tf.summary.histogram('label',label_holder) #label的histogram,测试训练代码时用，参考:http://geek.csdn.net/news/detail/197155

summary_op = tf.summary.merge(tf.get_collection(tf.GraphKeys.SUMMARIES))
#sess = tf.Session(config=tf.ConfigProto(log_device_placement=True))  #运行日志
sess = tf.Session()
train_writer = tf.summary.FileWriter(logs_train_dir,sess.graph)
saver = tf.train.Saver()

sess.run(tf.global_variables_initializer())

start_time1 = time.time()

for step in range(count):

    x_batch,y_batch = get_batch()

    start_time2 = time.time()
    time_str = datetime.datetime.now().isoformat()

    feed_dict = {image_holder:x_batch,label_holder:y_batch,keep_prob:0.5}
    _,_,_,_,_,_,_,tra_loss1,tra_loss2,tra_loss3,tra_loss4,tra_loss5,tra_loss6,tra_loss7,acc,summary_str= sess.run([train_op1,train_op2,train_op3,train_op4,train_op5,train_op6,train_op7,train_loss1,train_loss2,train_loss3,train_loss4,train_loss5,train_loss6,train_loss7,train_acc,summary_op],feed_dict)
    train_writer.add_summary(summary_str,step)
    duration = time.time()-start_time2
    tra_all_loss =tra_loss1+tra_loss2+tra_loss3+tra_loss4+tra_loss5+tra_loss6+tra_loss7

    #print(y_batch)  #仅测试代码训练实际样本与标签是否一致

    if step % 10== 0:
        sec_per_batch = float(duration)
        print('%s : Step %d,train_loss = %.2f,acc= %.2f,sec/batch=%.3f' %(time_str,step,tra_all_loss,acc,sec_per_batch))

    if step % 10000==0 or (step+1) == count:
        checkpoint_path = os.path.join(logs_train_dir,'model.ckpt')
        saver = tf.train.Saver()
        saver.save(sess,checkpoint_path,global_step=step)
sess.close()
print(time.time()-start_time1)
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因为测试数据过大，所以运行了一整天才出结果，调试可以把数据量改为30

5：测试模型准确度

import tensorflow as tf
import numpy as np
import os
from PIL import Image
import cv2
import matplotlib.pyplot as plt
import model
import genplate
tf.reset_default_graph()
index = {"京": 0, "沪": 1, "津": 2, "渝": 3, "冀": 4, "晋": 5, "蒙": 6, "辽": 7, "吉": 8, "黑": 9, "苏": 10, "浙": 11, "皖": 12,
         "闽": 13, "赣": 14, "鲁": 15, "豫": 16, "鄂": 17, "湘": 18, "粤": 19, "桂": 20, "琼": 21, "川": 22, "贵": 23, "云": 24,
         "藏": 25, "陕": 26, "甘": 27, "青": 28, "宁": 29, "新": 30, "0": 31, "1": 32, "2": 33, "3": 34, "4": 35, "5": 36,
         "6": 37, "7": 38, "8": 39, "9": 40, "A": 41, "B": 42, "C": 43, "D": 44, "E": 45, "F": 46, "G": 47, "H": 48,
         "J": 49, "K": 50, "L": 51, "M": 52, "N": 53, "P": 54, "Q": 55, "R": 56, "S": 57, "T": 58, "U": 59, "V": 60,
         "W": 61, "X": 62, "Y": 63, "Z": 64};

chars = ["京", "沪", "津", "渝", "冀", "晋", "蒙", "辽", "吉", "黑", "苏", "浙", "皖", "闽", "赣", "鲁", "豫", "鄂", "湘", "粤", "桂",
             "琼", "川", "贵", "云", "藏", "陕", "甘", "青", "宁", "新", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",
             "B", "C", "D", "E", "F", "G", "H", "J", "K", "L", "M", "N", "P", "Q", "R", "S", "T", "U", "V", "W", "X",
             "Y", "Z"
             ];
'''
Test one image against the saved models and parameters
'''
global pic
def get_one_image(test):
    '''
    Randomly pick one image from training data
    Return: ndarry
    '''
    G = genplate.GenPlate("./font/platech.ttf", './font/platechar.ttf', "./NoPlates")

    G.genBatch(15, 2, range(31, 65), "./plate", (272, 72))  # 注释原因为每次其他模块运行，若导入该库，都会刷性该函数
    n = len(test)
    ind =np.random.randint(0,n)
    img_dir = test[ind]

    image_show = Image.open(img_dir)
    plt.imshow(image_show)
    #image = image.resize([120,30])
    image = cv2.imread(img_dir)
    global  pic
    pic = image
    # cv2.imshow('image', image)
    # cv2.waitKey(0)
    img = np.multiply(image,1/255.0)
    #image = np.array(img)
    #image = img.transpose(1,0,2)
    image = np.array([img])
    print(image.shape)

    return image

batch_size = 1
x = tf.placeholder(tf.float32,[batch_size,72,272,3])
keep_prob =tf.placeholder(tf.float32)

test_dir = (r'.\plate/')
test_image = []
for file in os.listdir(test_dir):
    test_image.append(test_dir + file)
test_image = list(test_image)

image_array = get_one_image(test_image)

#logit = model.inference(x,keep_prob)
logit1,logit2,logit3,logit4,logit5,logit6,logit7 = model.inference(x,keep_prob)

#logit1 = tf.nn.softmax(logit1)
#logit2 = tf.nn.softmax(logit2)
#logit3 = tf.nn.softmax(logit3)
#logit4 = tf.nn.softmax(logit4)
#logit5 = tf.nn.softmax(logit5)
#logit6 = tf.nn.softmax(logit6)
#logit7 = tf.nn.softmax(logit7)

# logs_train_dir = '/home/llc/TF_test/Chinese_plate_recognition/Plate_recognition/train_logs_50000/'
logs_train_dir = (r'.\train_result/')
saver = tf.train.Saver()

with tf.Session() as sess:
    tf.get_variable_scope().reuse_variables()
    print ("Reading checkpoint...")
    ckpt = tf.train.get_checkpoint_state(logs_train_dir)
    if ckpt and ckpt.model_checkpoint_path:
        global_step = ckpt.model_checkpoint_path.split('/')[-1].split('-')[-1]
        saver.restore(sess, ckpt.model_checkpoint_path)
        print('Loading success, global_step is %s' % global_step)
    else:
        print('No checkpoint file found')

    pre1,pre2,pre3,pre4,pre5,pre6,pre7 = sess.run([logit1,logit2,logit3,logit4,logit5,logit6,logit7], feed_dict={x: image_array,keep_prob:1.0})
    prediction = np.reshape(np.array([pre1,pre2,pre3,pre4,pre5,pre6,pre7]),[-1,65])
    #prediction = np.array([[pre1],[pre2],[pre3],[pre4],[pre5],[pre6],[pre7]])
    #print(prediction)

    max_index = np.argmax(prediction,axis=1)
    print(max_index)
    line = ''
    for i in range(prediction.shape[0]):
        if i == 0:
            result = np.argmax(prediction[i][0:31])
        if i == 1:
            result = np.argmax(prediction[i][41:65])+41
        if i > 1:
            result = np.argmax(prediction[i][31:65])+31

        line += chars[result]+" "
    print ('predicted: ' + line)

cv2.imshow('pic',pic)
cv2.waitKeyEx(0)
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