Error when "orb.detectAndCompute" when using opencv (python)

Question

I am trying to use ORB to find the keypoints and descriptors of previously generated spectrograms. I have this code:

start = time.time()
x = 1
img = range(101)
imgname = range(101)

# Directory Images
os.chdir("/home/undead/Documents/TempSongSpectro/") #1,2,3
for file in glob.glob("*.png"):
    img[x] = cv2.imread(file, 0)  # trainImage
    imgname[x] = os.path.splitext(file)[0]
# print "%s: %d " % (os.path.splitext(file)[0],(x))
x = x + 1

# Initiate ORB detector
orb = cv2.ORB_create(3000)

# find the keypoints and descriptors with ORB
a = 1
des = range(101)
kp = range(101)

for a in range(1, 101):
    kp[a], des[a] = orb.detectAndCompute(img[a], None)

end = time.time()
print("Initialize time: %f seconds" % (end - start))

However, I am getting the error:

OpenCV Error: Assertion failed (depth == CV_8U || depth == CV_16U || depth == CV_32F) in cvtColor, file /home/undead/opencv/opencv-3.2.0/modules/imgproc/src/color.cpp, line 9710

Traceback (most recent call last):
  File "/home/undead/PycharmProjects/KavTest/Test3.py", line 37, in <module>
    kp[a], des[a] = orb.detectAndCompute(img[a], None)

cv2.error: /home/undead/opencv/opencv-3.2.0/modules/imgproc/src/color.cpp:9710: error: (-215) depth == CV_8U || depth == CV_16U || depth == CV_32F in function cvtColor

From what i gathered, the error may be related to the datatype of kp, des or img, but I'm not too sure on how to solve it. Can someone offer some assistance?

Kinght 金 · Accepted Answer · 2017-10-01 17:06:35Z

1

I think there is something wrong in your code.

This is my code doing nearly the same.

start = time.time()

imgnames = glob.glob("/home/undead/Documents/TempSongSpectro/*.png")
#imgnames = imgnames[:100]

sz = len(imgnames)
imgs = list(range(sz))

for i, name in enumerate(imgnames, start=0):
    imgs[i] =  cv2.imread(name, 0)

orb = cv2.ORB_create(3000)

# find the keypoints and descriptors with ORB
des = list(range(sz))
kp = list(range(sz))

for i in range(sz):
    kp[i], des[i] = orb.detectAndCompute(img[i], None)

end = time.time()
print("Initialize time: {:.4f} seconds".format(end - start))

answered Oct 1, 2017 at 17:06

Kinght 金

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