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python多进程读图提取特征存npy

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import multiprocessing
import os, time, random
import numpy as np
import cv2
import os
import sys
from time import ctime
import tensorflow as tf
 
image_dir = r "D:/sxl/处理图片/汉字分类/train10/"  #图像文件夹路径
data_type = 'test'
save_path = r 'E:/sxl_Programs/Python/CNN/npy/'  #存储路径
data_name = 'Img10'        #npy文件名
 
char_set = np.array(os.listdir(image_dir))   #文件夹名称列表
np.save(save_path + 'ImgShuZi10.npy' ,char_set)   #文件夹名称列表
char_set_n = len (char_set)       #文件夹列表长度
 
read_process_n = 1 #进程数
repate_n = 4   #随机移动次数
data_size = 1000000 #1个npy大小
 
shuffled = True  #是否打乱
 
#可以读取带中文路径的图
def cv_imread(file_path, type = 0 ):
  cv_img = cv2.imdecode(np.fromfile(file_path,dtype = np.uint8), - 1 )
  # print(file_path)
  # print(cv_img.shape)
  # print(len(cv_img.shape))
  if ( type = = 0 ):
   if ( len (cv_img.shape) = = 3 ):
    cv_img = cv2.cvtColor(cv_img, cv2.COLOR_BGR2GRAY)
  return cv_img
 
#多个数组按同一规则打乱数据
def ShuffledData(features,labels):
  '''
  @description:随机打乱数据与标签,但保持数据与标签一一对应
  '''
  permutation = np.random.permutation(features.shape[ 0 ])
  shuffled_features = features[permutation,:] #多维
  shuffled_labels = labels[permutation]  #1维
  return shuffled_features,shuffled_labels
 
#函数功能:简单网格
#函数要求:1.无关图像大小;2.输入图像默认为灰度图;3.参数只有输入图像
#返回数据:1x64*64维特征
def GetFeature(image):
 
  #图像大小归一化
  image = cv2.resize(image,( 64 , 64 ))
  img_h = image.shape[ 0 ]
  img_w = image.shape[ 1 ]
 
  #定义特征向量
  feature = np.zeros(img_h * img_w,dtype = np.int16)
 
  for h in range (img_h):
   for w in range (img_w):
    feature[h * img_h + w] = image[h,w]
 
  return feature
 
# 写数据进程执行的代码:
def read_image_to_queue(queue):
  print ( 'Process to write: %s' % os.getpid())
  for j,dirname in enumerate (char_set): # dirname 是文件夹名称
   label = np.where(char_set = = dirname)[ 0 ][ 0 #文件夹名称对应的下标序号
   print ( '序号:' + str (j), '读 ' + dirname + ' 文件夹...时间:' ,ctime() )
   for parent,_,filenames in os.walk(os.path.join(image_dir,dirname)):
    for filename in filenames:
     if (filename[ - 4 :]! = '.jpg' ):
      continue
     image = cv_imread(os.path.join(parent,filename), 0 )
 
     # cv2.imshow(dirname,image)
     # cv2.waitKey(0)
     queue.put((image,label))
 
  for i in range (read_process_n):
   queue.put(( None , - 1 ))
 
  print ( '读图结束!' )
  return True
  
# 读数据进程执行的代码:
def extract_feature(queue,lock,count):
  '''
  @description:从队列中取出图片进行特征提取
  @queue:先进先出队列
   lock:锁,在计数时上锁,防止冲突
   count:计数
  '''
 
  print ( 'Process %s start reading...' % os.getpid())
 
  global data_n
  features = [] #存放提取到的特征
  labels = [] #存放标签
  flag = True #标志着进程是否结束
  while flag:
   image,label = queue.get() #从队列中获取图像和标签
 
   if len (features) > = data_size or label = = - 1 : #特征数组的长度大于指定长度,则开始存储
 
    array_features = np.array(features) #转换成数组
    array_labels = np.array(labels)
 
    array_features,array_labels = ShuffledData(array_features,array_labels) #打乱数据
   
    lock.acquire() # 锁开始
 
    # 拆分数据为训练集,测试集
    split_x = int (array_features.shape[ 0 ] * 0.8 )
    train_data, test_data = np.split(array_features, [split_x], axis = 0 # 拆分特征数据集
    train_labels, test_labels = np.split(array_labels, [split_x], axis = 0 ) # 拆分标签数据集
 
    count.value + = 1 #下标计数加1
    str_features_name_train = data_name + '_features_train_' + str (count.value) + '.npy'
    str_labels_name_train = data_name + '_labels_train_' + str (count.value) + '.npy'
    str_features_name_test = data_name + '_features_test_' + str (count.value) + '.npy'
    str_labels_name_test = data_name + '_labels_test_' + str (count.value) + '.npy'
 
    lock.release() # 锁释放
 
    np.save(save_path + str_features_name_train,train_data)
    np.save(save_path + str_labels_name_train,train_labels)
    np.save(save_path + str_features_name_test,test_data)
    np.save(save_path + str_labels_name_test,test_labels)
    print (os.getpid(), 'save:' ,str_features_name_train)
    print (os.getpid(), 'save:' ,str_labels_name_train)
    print (os.getpid(), 'save:' ,str_features_name_test)
    print (os.getpid(), 'save:' ,str_labels_name_test)
    features.clear()
    labels.clear()
 
   if label = = - 1 :
    break
 
   # 获取特征向量,传入灰度图
   feature = GetFeature(image)
   features.append(feature)
   labels.append(label)
 
   # # 随机移动4次
   # for itime in range(repate_n):
   #  rMovedImage = randomMoveImage(image)
   #  feature = SimpleGridFeature(rMovedImage) # 简单网格
   #  features.append(feature)
   #  labels.append(label)
 
  print ( 'Process %s is done!' % os.getpid())
 
if __name__ = = '__main__' :
  time_start = time.time() # 开始计时
 
  # 父进程创建Queue,并传给各个子进程:
  image_queue = multiprocessing.Queue(maxsize = 1000 ) #队列
  lock = multiprocessing.Lock()      #锁
  count = multiprocessing.Value( 'i' , 0 )    #计数
 
  #将图写入队列进程
  write_sub_process = multiprocessing.Process(target = read_image_to_queue, args = (image_queue,))
 
  read_sub_processes = []       #读图子线程
  for i in range (read_process_n):
   read_sub_processes.append(
    multiprocessing.Process(target = extract_feature, args = (image_queue,lock,count))
   )
 
  # 启动子进程pw,写入:
  write_sub_process.start()
 
  # 启动子进程pr,读取:
  for p in read_sub_processes:
   p.start()
 
  # 等待进程结束:
  write_sub_process.join()
  for p in read_sub_processes:
   p.join()
 
  time_end = time.time()
  time_h = (time_end - time_start) / 3600
  print ( '用时:%.6f 小时' % time_h)
  print ( "读图提取特征存npy,运行结束!" )

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原文链接:https://blog.csdn.net/sxlsxl119/article/details/89340318 。

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