单个文件夹用a=20，多个文件夹用a = 文件夹序号 用于拼接nbarray
def read_directory(directory_name,a = 20,b=0):
u = len(os.listdir(directory_name))
k = 0
if a == 20:
pi = np.zeros((u),dtype=’uint’)
ha = np.zeros((u,1024),dtype=’float’)
for filename in os.listdir(directory_name):
img = cv2.imread(directory_name + “/” + filename)
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
for x in range(32): #图片的像素大小
for y in range(32):
if gray[2*y, 2*x] > 0:
ha[k][x*32 + y] = np.sqrt(gray[2*y, 2*x]/255.0)
pi[k] = 0
k = k + 1
return (ha,pi)
else:
pi = np.zeros((1,u),dtype=’uint’)
ha = np.zeros((u,1024),dtype=’float’)
for filename in os.listdir(directory_name):
img = cv2.imread(directory_name + “/” + filename)
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
for x in range(32):
for y in range(32):
if gray[2*y, 2*x] > 0:
ha[k][x*32 + y] = np.sqrt(gray[2*y, 2*x]/255.0)
pi[0][k] = a
k = k + 1
if a > 0:
ha = np.vstack((b[0], ha))
pi = np.append(b[1],pi)
return (ha,pi)
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