1. 快速建立图片数据集,我们将使用 Bing Image Search API 建立自己的图片数据集。

首先进入 ​​Bing Image Search API​​ 网站:​​点击链接​​

 

深度学习入门之快速建立图片数据集_下载图片

 

 

点击“Get API Key”按钮

深度学习入门之快速建立图片数据集_python_02

 

 

选择7天试用,点击“Get start”按钮

 

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同意微软服务条款和勾选地区,点击“Next”按钮

 

深度学习入门之快速建立图片数据集_python_04

 

 

可以使用你的 Microsoft, Facebook, LinkedIn, 或 GitHub 账号登陆,我使用我的 GitHub 账号登陆。

注册完成,进入​​Your APIs​​ 页面。如下图所示:

 

深度学习入门之快速建立图片数据集_下载图片_05

 

 

向下拖动,可以查看可以使用的API列表和API Keys,注意红框部分,将在后面部分使用到。

 

深度学习入门之快速建立图片数据集_microsoft_06

 

 

至此,你已经有一个Bing Image Search API账号,并可以使用 Bing Image Search API 了。你可以访问:

  • ​​Quickstart: Search for images using the Bing Image Search REST API and Python​​
  • ​​How to page through results from the Bing Web Search API​​

了解更多关于 Bing Image Search API 如何使用的信息。下面将介绍编写Python脚本,使用 Bing Image Search API 下载图片。

2. 编写Python脚本下载图片

首先安装 requests 包,在终端执行命令

$ pip install requests
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新建一个文件,命名为 search_bing_api.py,插入以下代码

# import the necessary packages
from requests import exceptions
import argparse
import requests
import os
import cv2

# construct the argument parser and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-q", "--query", required=True,
help="search query to search Bing Image API for")
args = vars(ap.parse_args())

query = args["query"]
output = "/Users/simon/AI/dataset/" + query

# set your Microsoft Cognitive Services API key along with (1) the
# maximum number of results for a given search and (2) the group size
# for results (maximum of 50 per request)
API_KEY = "YOUR Bing Image Search API Key"
MAX_RESULTS = 250
GROUP_SIZE = 50

# set the endpoint API URL
URL = "https://api.cognitive.microsoft.com/bing/v7.0/images/search"

# when attempting to download images from the web both the Python
# programming language and the requests library have a number of
# exceptions that can be thrown so let's build a list of them now
# so we can filter on them
EXCEPTIONS = set([IOError, FileNotFoundError,exceptions.RequestException, exceptions.HTTPError,exceptions.ConnectionError, exceptions.Timeout])


# store the search term in a convenience variable then set the
# headers and search parameters
term = query
headers = {"Ocp-Apim-Subscription-Key" : API_KEY}
params = {"q": term, "offset": 0, "count": GROUP_SIZE}

# make the search
print("[INFO] searching Bing API for '{}'".format(term))
search = requests.get(URL, headers=headers, params=params)
search.raise_for_status()

# grab the results from the search, including the total number of
# estimated results returned by the Bing API
results = search.json()
estNumResults = min(results["totalEstimatedMatches"], MAX_RESULTS)
print("[INFO] {} total results for '{}'".format(estNumResults,term))

# initialize the total number of images downloaded thus far
total = 0

# loop over the estimated number of results in `GROUP_SIZE` groups
for offset in range(0, estNumResults, GROUP_SIZE):
# update the search parameters using the current offset, then
# make the request to fetch the results
print("[INFO] making request for group {}-{} of {}...".format(
offset, offset + GROUP_SIZE, estNumResults))
params["offset"] = offset
search = requests.get(URL, headers=headers, params=params)
search.raise_for_status()
results = search.json()
print("[INFO] saving images for group {}-{} of {}...".format(
offset, offset + GROUP_SIZE, estNumResults))

# loop over the results
for v in results["value"]:
# try to download the image
try:
# make a request to download the image
print("[INFO] fetching: {}".format(v["contentUrl"]))
r = requests.get(v["contentUrl"], timeout=30)

# build the path to the output image
ext = v["contentUrl"][v["contentUrl"].rfind("."):]
p = os.path.sep.join([output, "{}{}".format(str(total).zfill(8), ext)])

# write the image to disk
f = open(p, "wb")
f.write(r.content)
f.close()
image = cv2.imread(p)

# if the image is `None` then we could not properly load the
# image from disk (so it should be ignored)
if image is None:
print("[INFO] deleting: {}".format(p))
os.remove(p)
continue

# catch any errors that would not unable us to download the
# image
except Exception as e:
# check to see if our exception is in our list of
# exceptions to check for
if type(e) in EXCEPTIONS:
print("[INFO] skipping: {}".format(v["contentUrl"]))
continue

# update the counter
total += 1
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以上为所有的Python下载图片代码,注意以下红框部分替换为自己的文件目录和自己的 Bing Image Search API Key。

 

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3. 运行下载脚本,下载图片

创建图片存储主目录,在终端执行命令

$ mkdir dataset
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创建当前下载内容的存储目录,在终端执行命令

$ mkdir dataset/pikachu
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终端执行命令如下命令,开始下载图片

$ python search_bing_api.py --query "pikachu"
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[INFO] searching Bing API for 'pikachu'
[INFO] 250 total results for 'pikachu'
[INFO] making request for group 0-50 of 250...
[INFO] saving images for group 0-50 of 250...
[INFO] fetching: http://images5.fanpop.com/image/photos/29200000/PIKACHU-pikachu-29274386-861-927.jpg
[INFO] skipping: http://images5.fanpop.com/image/photos/29200000/PIKACHU-pikachu-29274386-861-927.jpg
[INFO] fetching: http://images6.fanpop.com/image/photos/33000000/pikachu-pikachu-33005706-895-1000.png
[INFO] skipping: http://images6.fanpop.com/image/photos/33000000/pikachu-pikachu-33005706-895-1000.png
[INFO] fetching: http://images5.fanpop.com/image/photos/31600000/Pikachu-with-pokeball-pikachu-31615402-2560-2245.jpg
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按照相同的方法下载其他图片:charmander,squirtle,bulbasaur,mewtwo

下载 charmander

$ mkdir dataset/charmander
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$ python search_bing_api.py --query "charmander"
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下载 squirtle

$ mkdir dataset/squirtle
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$ python search_bing_api.py --query "squirtle"
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下载 bulbasaur

$ mkdir dataset/bulbasaur
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$ python search_bing_api.py --query "bulbasaur"
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下载 mewtwo

$ mkdir dataset/mewtwo
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$ python search_bing_api.py --query "mewtwo"
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下载的图片如下图所示

 

深度学习入门之快速建立图片数据集_microsoft_08

 

 

下载全部完成大约需要30多分钟时间,最终五个文件夹下的图片内容如下

深度学习入门之快速建立图片数据集_microsoft_09

 

 

为了更好的训练模型,我们应该进行图片筛选,将不合适的图片删除掉。比如在某一个分类文件夹下,将不属于这个分类的图片删除掉,将包含了其他分类的图片删除等。筛选方法为,打开文件夹,浏览图片,手工进行筛选。