AttributeError: 'module' object has no attribute

Question

I am trying to get the depth map of two stereo images. I have taken the code from this documentation.

I get the following error:

Traceback (most recent call last):
  File "depth.py", line 9, in <module>
    stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
AttributeError: 'module' object has no attribute 'createStereoBM'

My code is:

import numpy as np
import cv2
from matplotlib import pyplot as plt

imgL = cv2.imread('tsukuba_l.png',0)
imgR = cv2.imread('tsukuba_r.png',0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL,imgR)
plt.imshow(disparity,'gray')
plt.show()

I entered the Python line interpreter, and wrote the following code:

import cv2
help(cv2)

There is no function called createStereoBM in cv2.

Is the code wrong in the link provided at the top? I am using Python 2.7.3 in Ubuntu 12.04. Is it possible that the code is meant for Python 3 and above?

Please help.

the code you're using is from the opencv master/3.0 branch. (and yes, you have to use cv2.createStereoBM() there instead of cv2.StereoBM() ) for looking at further examples, use the 2.4 branch instead . — berak
– berak, Commented Feb 11, 2014 at 14:21
I had to use cv2.StereoBM_create() for 3.0.0-beta version of OpenCV — fdermishin
– fdermishin, Commented Mar 25, 2015 at 15:03

Abhishek Raj · Accepted Answer · 2017-04-27 14:51:01Z

12

cv2.StereoBM_create(numDisparities=16, blockSize=15)

Try it. My opencv version is 3.2.

If you want to find any function working in opencv, you can try this

import(cv2)

help(cv2)

answered Apr 27, 2017 at 14:51

Abhishek Raj

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Comments

youssefhassan · Accepted Answer · 2014-02-11 14:16:22Z

11

Use this function instead

stereo = cv2.StereoBM(cv2.STEREO_BM_BASIC_PRESET,ndisparities=16, SADWindowSize=15)

You can find documentation for this function here

answered Feb 11, 2014 at 14:16

youssefhassan

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1 Comment

Dzwiedziu-nkg Over a year ago

But not works with >= 3.x. This works: stackoverflow.com/a/43661169/1797782

Francesco B. · Accepted Answer · 2018-04-05 19:47:36Z

2

import numpy as np

import cv2

from matplotlib import pyplot as plt

imgL = cv2.imread('l.png',0)

imgR = cv2.imread('r.png',0)

stereo = cv2.StereoBM_create(numDisparities=16, blockSize=15)

disparity = stereo.compute(imgL,imgR)

plt.imshow(disparity,'gray')

plt.show()

try to use this code is your using the code from open-cv documentation

edited Apr 5, 2018 at 19:47

Francesco B.

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answered Apr 5, 2018 at 19:07

hemant yadav

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Comments

pbacterio · Accepted Answer · 2014-02-11 14:35:09Z

1

You are getting the example from the trunk (aka devel) documentation. if you aren't using trunk version, try to find an example for your correct version.

answered Feb 11, 2014 at 14:35

pbacterio

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