import?os??
from?PIL?import?Image????
import?matplotlib.pyplot?as?plt??
import?numpy?as?np??
from?scipy.misc?import?imread???
filepath?='/home/JPEGImages'?#?數(shù)據(jù)集目錄??
pathDir?=?os.listdir(filepath)??
R_channel?=0??
G_channel?=0??
B_channel?=0??
for?idx?in?xrange(len(pathDir)):??
????filename?=?pathDir[idx]??
????img?=?imread(os.path.join(filepath,?filename))??
R_channel?=?R_channel?+?np.sum(img[:,:,0])??
G_channel?=?G_channel?+?np.sum(img[:,:,1])??
B_channel?=?B_channel?+?np.sum(img[:,:,2])??
num?=?len(pathDir)?*384?*?512?#?這里（384,512）是每幅圖片的大小，所有圖片尺寸都一樣??
R_mean?=?R_channel?/?num??
G_mean?=?G_channel?/?num??
B_mean?=?B_channel?/?num??
print("R_mean?is?%f,?G_mean?is?%f,?B_mean?is?%f"?%(R_mean,?G_mean,?B_mean))??
