TensorFLow 不同大小图片的TFrecords存取

刚搬到美国，终于有时间搞竞赛了。。

全部存入一个TFrecords文件，然后读取并显示第一张。
不多写了，直接贴代码。

from PIL import Imageimport numpy as npimport matplotlib.pyplot as pltimport tensorflow as tfIMAGE_PATH = 'test/'tfrecord_file = IMAGE_PATH + 'test.tfrecord'writer = tf.python_io.TFRecordWriter(tfrecord_file)def _int64_feature(value):  return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))def _bytes_feature(value):  return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))def get_image_binary(filename):    """ You can read in the image using tensorflow too, but it's a drag        since you have to create graphs. It's much easier using Pillow and NumPy    """    image = Image.open(filename)    image = np.asarray(image, np.uint8)    shape = np.array(image.shape, np.int32)    return shape, image.tobytes() # convert image to raw data bytes in the array.def write_to_tfrecord(label, shape, binary_image, tfrecord_file):    """ This example is to write a sample to TFRecord file. If you want to write    more samples, just use a loop.    """    # write label, shape, and image content to the TFRecord file    example = tf.train.Example(features=tf.train.Features(feature={                'label': _int64_feature(label),                'h': _int64_feature(shape[0]),                'w': _int64_feature(shape[1]),                'c': _int64_feature(shape[2]),                'image': _bytes_feature(binary_image)                }))    writer.write(example.SerializeToString())def write_tfrecord(label, image_file, tfrecord_file):    shape, binary_image = get_image_binary(image_file)    write_to_tfrecord(label, shape, binary_image, tfrecord_file)   # print(shape)def main():    # assume the image has the label Chihuahua, which corresponds to class number 1    label = [1,2]    image_files = [IMAGE_PATH + 'a.jpg', IMAGE_PATH + 'b.jpg']    for i in range(2):        write_tfrecord(label[i], image_files[i], tfrecord_file)    writer.close()    batch_size = 2    filename_queue = tf.train.string_input_producer([tfrecord_file])      reader = tf.TFRecordReader()      _, serialized_example = reader.read(filename_queue)      img_features = tf.parse_single_example(                                          serialized_example,                                          features={                                                 'label': tf.FixedLenFeature([], tf.int64),                                                 'h': tf.FixedLenFeature([], tf.int64),                                               'w': tf.FixedLenFeature([], tf.int64),                                               'c': tf.FixedLenFeature([], tf.int64),                                               'image': tf.FixedLenFeature([], tf.string),                                                 })      h = tf.cast(img_features['h'], tf.int32)    w = tf.cast(img_features['w'], tf.int32)    c = tf.cast(img_features['c'], tf.int32)    image = tf.decode_raw(img_features['image'], tf.uint8)      image = tf.reshape(image, [h, w, c])    label = tf.cast(img_features['label'],tf.int32)     label = tf.reshape(label, [1])  #  image = tf.image.resize_images(image, (500,500))    #image, label = tf.train.batch([image, label],  batch_size= batch_size)      with tf.Session() as sess:        coord = tf.train.Coordinator()        threads = tf.train.start_queue_runners(coord=coord)        image, label=sess.run([image, label])        coord.request_stop()        coord.join(threads)        print(label)        plt.figure()        plt.imshow(image)        plt.show()if __name__ == '__main__':    main()

全部存入一个TFrecords文件，然后按照batch_size读取，注意需要将图片变成一样大才能按照batch_size读取。

from PIL import Imageimport numpy as npimport matplotlib.pyplot as pltimport tensorflow as tfIMAGE_PATH = 'test/'tfrecord_file = IMAGE_PATH + 'test.tfrecord'writer = tf.python_io.TFRecordWriter(tfrecord_file)def _int64_feature(value):  return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))def _bytes_feature(value):  return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))def get_image_binary(filename):    """ You can read in the image using tensorflow too, but it's a drag        since you have to create graphs. It's much easier using Pillow and NumPy    """    image = Image.open(filename)    image = np.asarray(image, np.uint8)    shape = np.array(image.shape, np.int32)    return shape, image.tobytes() # convert image to raw data bytes in the array.def write_to_tfrecord(label, shape, binary_image, tfrecord_file):    """ This example is to write a sample to TFRecord file. If you want to write    more samples, just use a loop.    """    # write label, shape, and image content to the TFRecord file    example = tf.train.Example(features=tf.train.Features(feature={                'label': _int64_feature(label),                'h': _int64_feature(shape[0]),                'w': _int64_feature(shape[1]),                'c': _int64_feature(shape[2]),                'image': _bytes_feature(binary_image)                }))    writer.write(example.SerializeToString())def write_tfrecord(label, image_file, tfrecord_file):    shape, binary_image = get_image_binary(image_file)    write_to_tfrecord(label, shape, binary_image, tfrecord_file)   # print(shape)def main():    # assume the image has the label Chihuahua, which corresponds to class number 1    label = [1,2]    image_files = [IMAGE_PATH + 'a.jpg', IMAGE_PATH + 'b.jpg']    for i in range(2):        write_tfrecord(label[i], image_files[i], tfrecord_file)    writer.close()    batch_size = 2    filename_queue = tf.train.string_input_producer([tfrecord_file])      reader = tf.TFRecordReader()      _, serialized_example = reader.read(filename_queue)      img_features = tf.parse_single_example(                                          serialized_example,                                          features={                                                 'label': tf.FixedLenFeature([], tf.int64),                                                 'h': tf.FixedLenFeature([], tf.int64),                                               'w': tf.FixedLenFeature([], tf.int64),                                               'c': tf.FixedLenFeature([], tf.int64),                                               'image': tf.FixedLenFeature([], tf.string),                                                 })      h = tf.cast(img_features['h'], tf.int32)    w = tf.cast(img_features['w'], tf.int32)    c = tf.cast(img_features['c'], tf.int32)    image = tf.decode_raw(img_features['image'], tf.uint8)      image = tf.reshape(image, [h, w, c])    label = tf.cast(img_features['label'],tf.int32)     label = tf.reshape(label, [1])    image = tf.image.resize_images(image, (224,224))    image = tf.reshape(image, [224, 224, 3])    image, label = tf.train.batch([image, label],  batch_size= batch_size)      with tf.Session() as sess:        coord = tf.train.Coordinator()        threads = tf.train.start_queue_runners(coord=coord)        image, label=sess.run([image, label])        coord.request_stop()        coord.join(threads)        print(image.shape)        print(label)        plt.figure()        plt.imshow(image[0,:,:,0])        plt.show()        plt.figure()        plt.imshow(image[0,:,:,1])        plt.show()        image1 = image[0,:,:,:]        print(image1.shape)        print(image1.dtype)        im = Image.fromarray(np.uint8(image1)) #参考numpy和图片的互转：http://blog.csdn.net/zywvvd/article/details/72810360        im.show()if __name__ == '__main__':    main()

输出是

(2, 224, 224, 3)[[1] [2]]第一张图片的三种显示（略）

封装成函数：

# -*- coding: utf-8 -*-"""Created on Fri Sep  8 14:38:15 2017@author: wayne"""'''本文参考了以下代码，在多个不同大小图片存取方面做了重新开发：https://github.com/chiphuyen/stanford-tensorflow-tutorials/blob/master/examples/09_tfrecord_example.pyhttp://blog.csdn.net/hjxu2016/article/details/76165559https://stackoverflow.com/questions/41921746/tensorflow-varlenfeature-vs-fixedlenfeaturehttps://github.com/tensorflow/tensorflow/issues/10492后续：-存入多个TFrecords文件的例子见http://blog.csdn.net/xierhacker/article/details/72357651-如何作shuffle和数据增强string_input_producer (需要理解tf的数据流，标签队列的工作方式等等)http://blog.csdn.net/liuchonge/article/details/73649251'''from PIL import Imageimport numpy as npimport matplotlib.pyplot as pltimport tensorflow as tfIMAGE_PATH = 'test/'tfrecord_file = IMAGE_PATH + 'test.tfrecord'writer = tf.python_io.TFRecordWriter(tfrecord_file)def _int64_feature(value):  return tf.train.Feature(int64_list=tf.train.Int64List(value=[value]))def _bytes_feature(value):  return tf.train.Feature(bytes_list=tf.train.BytesList(value=[value]))def get_image_binary(filename):    """ You can read in the image using tensorflow too, but it's a drag        since you have to create graphs. It's much easier using Pillow and NumPy    """    image = Image.open(filename)    image = np.asarray(image, np.uint8)    shape = np.array(image.shape, np.int32)    return shape, image.tobytes() # convert image to raw data bytes in the array.def write_to_tfrecord(label, shape, binary_image, tfrecord_file):    """ This example is to write a sample to TFRecord file. If you want to write    more samples, just use a loop.    """    # write label, shape, and image content to the TFRecord file    example = tf.train.Example(features=tf.train.Features(feature={                'label': _int64_feature(label),                'h': _int64_feature(shape[0]),                'w': _int64_feature(shape[1]),                'c': _int64_feature(shape[2]),                'image': _bytes_feature(binary_image)                }))    writer.write(example.SerializeToString())def write_tfrecord(label, image_file, tfrecord_file):    shape, binary_image = get_image_binary(image_file)    write_to_tfrecord(label, shape, binary_image, tfrecord_file)def read_and_decode(tfrecords_file, batch_size):      '''''read and decode tfrecord file, generate (image, label) batches     Args:         tfrecords_file: the directory of tfrecord file         batch_size: number of images in each batch     Returns:         image: 4D tensor - [batch_size, width, height, channel]         label: 1D tensor - [batch_size]     '''      # make an input queue from the tfrecord file      filename_queue = tf.train.string_input_producer([tfrecord_file])      reader = tf.TFRecordReader()      _, serialized_example = reader.read(filename_queue)      img_features = tf.parse_single_example(                                          serialized_example,                                          features={                                                 'label': tf.FixedLenFeature([], tf.int64),                                                 'h': tf.FixedLenFeature([], tf.int64),                                               'w': tf.FixedLenFeature([], tf.int64),                                               'c': tf.FixedLenFeature([], tf.int64),                                               'image': tf.FixedLenFeature([], tf.string),                                                 })      h = tf.cast(img_features['h'], tf.int32)    w = tf.cast(img_features['w'], tf.int32)    c = tf.cast(img_features['c'], tf.int32)    image = tf.decode_raw(img_features['image'], tf.uint8)      image = tf.reshape(image, [h, w, c])    label = tf.cast(img_features['label'],tf.int32)     label = tf.reshape(label, [1])    ##########################################################      # you can put data augmentation here   #    distorted_image = tf.random_crop(images, [530, 530, img_channel])#    distorted_image = tf.image.random_flip_left_right(distorted_image)#    distorted_image = tf.image.random_brightness(distorted_image, max_delta=63)#    distorted_image = tf.image.random_contrast(distorted_image, lower=0.2, upper=1.8)#    distorted_image = tf.image.resize_images(distorted_image, (imagesize,imagesize))#    float_image = tf.image.per_image_standardization(distorted_image)    image = tf.image.resize_images(image, (224,224))    image = tf.reshape(image, [224, 224, 3])    #image, label = tf.train.batch([image, label],  batch_size= batch_size)      image_batch, label_batch = tf.train.batch([image, label],                                                  batch_size= batch_size,                                                  num_threads= 64,                                                   capacity = 2000)      return image_batch, tf.reshape(label_batch, [batch_size])  def read_tfrecord2(tfrecord_file, batch_size):    train_batch, train_label_batch = read_and_decode(tfrecord_file, batch_size)    with tf.Session() as sess:        coord = tf.train.Coordinator()        threads = tf.train.start_queue_runners(coord=coord)        train_batch, train_label_batch = sess.run([train_batch, train_label_batch])        coord.request_stop()        coord.join(threads)    return train_batch, train_label_batchdef main():    # assume the image has the label Chihuahua, which corresponds to class number 1    label = [1,2]    image_files = [IMAGE_PATH + 'a.jpg', IMAGE_PATH + 'b.jpg']    for i in range(2):        write_tfrecord(label[i], image_files[i], tfrecord_file)    writer.close()    batch_size = 2   # read_tfrecord(tfrecord_file) # 读取一个图    train_batch, train_label_batch = read_tfrecord2(tfrecord_file, batch_size)    print(train_batch.shape)    print(train_label_batch)    plt.figure()    plt.imshow(train_batch[0,:,:,0])    plt.show()    plt.figure()    plt.imshow(train_batch[0,:,:,1])    plt.show()    train_batch1 = train_batch[0,:,:,:]    print(train_batch.shape)    print(train_batch1.dtype)    im = Image.fromarray(np.uint8(train_batch1)) #参考numpy和图片的互转：http://blog.csdn.net/zywvvd/article/details/72810360    im.show()if __name__ == '__main__':    main()