TensorFlow笔记五：将cifar10数据文件复原成图片格式

一、cifar10数据集

（http://www.cs.toronto.edu/~kriz/cifar-10-python.tar.gz）源格式是数据文件，因为训练需要转换成图片格式

转换代码：

注意文件路径改成自己的文件路径，train文件夹需要自己建，等待转换完成

from scipy.misc import imsave
import numpy as np

# 解压 返回解压后的字典
def unpickle(file):
    import pickle as pk
    fo = open(file, 'rb')
    dict = pk.load(fo,encoding='iso-8859-1')
    fo.close()
    return dict

# 生成训练集图片
for j in range(1, 6):
    dataName = "cifar-10-python/cifar-10-batches-py/data_batch_" + str(j)  # 读取当前目录下的data_batch1~5文件。
    Xtr = unpickle(dataName)
    print (dataName + " is loading...")

    for i in range(0, 10000):
        img = np.reshape(Xtr['data'][i], (3, 32, 32))  # Xtr['data']为图片二进制数据
        img = img.transpose(1, 2, 0)  # 读取image
        picName = 'train/' + str(Xtr['labels'][i]) + '_' + str(i + (j - 1)*10000) + '.jpg'
        # Xtr['labels']为图片的标签，值范围0-9，本文中，train文件夹需要存在，并与脚本文件在同一目录下。
        imsave(picName, img)
    print (dataName + " loaded.")

print ("test_batch is loading...")

# 生成测试集图片
testXtr = unpickle("test_batch")
for i in range(0, 10000):
    img = np.reshape(testXtr['data'][i], (3, 32, 32))
    img = img.transpose(1, 2, 0)
    picName = 'test/' + str(testXtr['labels'][i]) + '_' + str(i) + '.jpg'
    imsave(picName, img)
print ("test_batch loaded.")

二、mnist数据集的转化

1、先解压出二进制文件，再运行

import numpy as np
import struct  

from PIL import Image
import os  

data_file = 'MNIST_data/train-images.idx3-ubyte' #需要修改的路径
# It's 47040016B, but we should set to 47040000B
data_file_size = 47040016
data_file_size = str(data_file_size - 16) + 'B'  

data_buf = open(data_file, 'rb').read()  

magic, numImages, numRows, numColumns = struct.unpack_from(
    '>IIII', data_buf, 0)
datas = struct.unpack_from(
    '>' + data_file_size, data_buf, struct.calcsize('>IIII'))
datas = np.array(datas).astype(np.uint8).reshape(
    numImages, 1, numRows, numColumns)  

label_file = 'MNIST_data/train-labels.idx1-ubyte' #需要修改的路径  

# It's 60008B, but we should set to 60000B
label_file_size = 60008
label_file_size = str(label_file_size - 8) + 'B'  

label_buf = open(label_file, 'rb').read()  

magic, numLabels = struct.unpack_from('>II', label_buf, 0)
labels = struct.unpack_from(
    '>' + label_file_size, label_buf, struct.calcsize('>II'))
labels = np.array(labels).astype(np.int64)  

datas_root = 'MNIST_data/mnist_train' #需要修改的路径
if not os.path.exists(datas_root):
    os.mkdir(datas_root)  

for i in range(10):
    file_name = datas_root + os.sep + str(i)
    if not os.path.exists(file_name):
        os.mkdir(file_name)  

for ii in range(numLabels):
    img = Image.fromarray(datas[ii, 0, 0:28, 0:28])
    label = labels[ii]
    file_name = datas_root + os.sep + str(label) + os.sep + 'mnist_train_' + str(ii) + '.png'
    img.save(file_name)

import numpy as np
import struct  

from PIL import Image
import os  

data_file = 'MNIST_data/t10k-images.idx3-ubyte' #需要修改的路径  

# It's 7840016B, but we should set to 7840000B
data_file_size = 7840016
data_file_size = str(data_file_size - 16) + 'B'  

data_buf = open(data_file, 'rb').read()  

magic, numImages, numRows, numColumns = struct.unpack_from(
    '>IIII', data_buf, 0)
datas = struct.unpack_from(
    '>' + data_file_size, data_buf, struct.calcsize('>IIII'))
datas = np.array(datas).astype(np.uint8).reshape(
    numImages, 1, numRows, numColumns)  

label_file = 'MNIST_data/t10k-labels.idx1-ubyte'#需要修改的路径  

# It's 10008B, but we should set to 10000B
label_file_size = 10008
label_file_size = str(label_file_size - 8) + 'B'  

label_buf = open(label_file, 'rb').read()  

magic, numLabels = struct.unpack_from('>II', label_buf, 0)
labels = struct.unpack_from(
    '>' + label_file_size, label_buf, struct.calcsize('>II'))
labels = np.array(labels).astype(np.int64)  

datas_root = 'MNIST_data/mnist_test' #需要修改的路径  

if not os.path.exists(datas_root):
    os.mkdir(datas_root)  

for i in range(10):
    file_name = datas_root + os.sep + str(i)
    if not os.path.exists(file_name):
        os.mkdir(file_name)  

for ii in range(numLabels):
    img = Image.fromarray(datas[ii, 0, 0:28, 0:28])
    label = labels[ii]
    file_name = datas_root + os.sep + str(label) + os.sep +  'mnist_test_' + str(ii) + '.png'
    img.save(file_name)

2、接着构造出图片集noisy_test和noisy_train

这两个图片集是加了椒盐噪声的集合（可用作图像去噪）

import numpy as np
import struct
import numpy as np
from PIL import Image
import os  

data_file = 'MNIST_data/train-images.idx3-ubyte' #需要修改的路径
# It's 47040016B, but we should set to 47040000B
data_file_size = 47040016
data_file_size = str(data_file_size - 16) + 'B'  

data_buf = open(data_file, 'rb').read()  

magic, numImages, numRows, numColumns = struct.unpack_from(
    '>IIII', data_buf, 0)
datas = struct.unpack_from(
    '>' + data_file_size, data_buf, struct.calcsize('>IIII'))
datas = np.array(datas).astype(np.uint8).reshape(
    numImages, 1, numRows, numColumns)  

label_file = 'MNIST_data/train-labels.idx1-ubyte' #需要修改的路径  

# It's 60008B, but we should set to 60000B
label_file_size = 60008
label_file_size = str(label_file_size - 8) + 'B'  

label_buf = open(label_file, 'rb').read()  

magic, numLabels = struct.unpack_from('>II', label_buf, 0)
labels = struct.unpack_from(
    '>' + label_file_size, label_buf, struct.calcsize('>II'))
labels = np.array(labels).astype(np.int64)  

datas_root = 'MNIST_data/noisy_train' #需要修改的路径
if not os.path.exists(datas_root):
    os.mkdir(datas_root)  

for i in range(10):
    file_name = datas_root + os.sep + str(i)
    if not os.path.exists(file_name):
        os.mkdir(file_name)  

for ii in range(numLabels):
    img = Image.fromarray(datas[ii, 0, 0:28, 0:28])
    label = labels[ii]
    file_name = datas_root + os.sep + str(label) + os.sep + 'mnist_train_' + str(ii) + '.png'
    x_train_noisy = np.array(img)
    noise_factor = 0.5
    x_train_noisy = x_train_noisy.astype('float32') / 255.
    x_train_noisy = x_train_noisy + noise_factor * np.random.normal(loc=0.0, scale=1.0, size=x_train_noisy.shape)
    x_train_noisy = np.clip(x_train_noisy, 0., 1.)
    x_train_noisy = x_train_noisy.astype(np.float)
    x_train_noisy = x_train_noisy.astype('float32') * 255
    x_train_noisy = x_train_noisy.astype(np.uint8)
    #print(x_train_noisy)
    #os._exit(0)
    img=Image.fromarray(x_train_noisy)
    img.save(file_name)

import numpy as np
import struct  

from PIL import Image
import os  

data_file = 'MNIST_data/t10k-images.idx3-ubyte' #需要修改的路径  

# It's 7840016B, but we should set to 7840000B
data_file_size = 7840016
data_file_size = str(data_file_size - 16) + 'B'  

data_buf = open(data_file, 'rb').read()  

magic, numImages, numRows, numColumns = struct.unpack_from(
    '>IIII', data_buf, 0)
datas = struct.unpack_from(
    '>' + data_file_size, data_buf, struct.calcsize('>IIII'))
datas = np.array(datas).astype(np.uint8).reshape(
    numImages, 1, numRows, numColumns)  

label_file = 'MNIST_data/t10k-labels.idx1-ubyte'#需要修改的路径  

# It's 10008B, but we should set to 10000B
label_file_size = 10008
label_file_size = str(label_file_size - 8) + 'B'  

label_buf = open(label_file, 'rb').read()  

magic, numLabels = struct.unpack_from('>II', label_buf, 0)
labels = struct.unpack_from(
    '>' + label_file_size, label_buf, struct.calcsize('>II'))
labels = np.array(labels).astype(np.int64)  

datas_root = 'MNIST_data/noisy_test' #需要修改的路径  

if not os.path.exists(datas_root):
    os.mkdir(datas_root)  

for i in range(10):
    file_name = datas_root + os.sep + str(i)
    if not os.path.exists(file_name):
        os.mkdir(file_name)  

for ii in range(numLabels):
    img = Image.fromarray(datas[ii, 0, 0:28, 0:28])
    label = labels[ii]
    file_name = datas_root + os.sep + str(label) + os.sep + 'mnist_test_' + str(ii) + '.png'
    x_train_noisy = np.array(img)
    noise_factor = 0.5
    x_train_noisy = x_train_noisy.astype('float32') / 255.
    x_train_noisy = x_train_noisy + noise_factor * np.random.normal(loc=0.0, scale=1.0, size=x_train_noisy.shape)
    x_train_noisy = np.clip(x_train_noisy, 0., 1.)
    x_train_noisy = x_train_noisy.astype(np.float)
    x_train_noisy = x_train_noisy.astype('float32') * 255
    x_train_noisy = x_train_noisy.astype(np.uint8)
    #print(x_train_noisy)
    #os._exit(0)
    img=Image.fromarray(x_train_noisy)
    img.save(file_name)