如何解决ImportError：无法在python中导入名称splitfn

Question

i have write code to calibrate camera in my calibrate.py file,but when i run that file it shows error like, ImportError: cannot import name splitfn ..so how to solve this?...i have run this file using this command:

sudo python calibrate.py image4.jpg calibration.yaml --debug-dir out

so is this right command to execute this script?if any changes then plz suggest me.. my captured image for calibration(which i have gave as input) and output(RMS,camera matrix,distortion coefficient)is stored in calibration.yaml file?i need to make this file or it is automatically created?

Answer 1

Looks like you did not get the rest of the code repository. This line cannot find common.py which is where the splitfn function is defined:

from common import splitfn

You should get all files in Python directory of the repository that this code came from or at least getting common.py should resolve the example error you provided.

https://github.com/Itseez/opencv/tree/master/samples/python

Also, the OpenCv example code documents how to call the code from within it so don't think you will need the .yaml parameter in your call.

usage: calibrate.py [--debug ] [--square_size] []

[--debug ] = path where you want the output image to be written to - defaults to --debug: ./output/ -- if you want image to be written to same path that has calibrate.py you could try --debug ./

Not sure exactly what --square_size does but it defaults to 1 Last input is path or name of image if it is in same directory as the calibrate script - if image4.jpg is your image and you want to write to current path using defaults it would be I think:

sudo python calibrate.py --debug ./ --square_size 1 image4.jpg

Answer 2

The splitfn just provides path, file_name(without ext) and ext of the input file. One can use below implementation for the same.

#from common import splitfn
def splitfn(file_path):

    file_path_parts = file_path.split(sep=os.sep)
    _path = os.path.join(*file_path_parts[:-1])
    file_name = file_path_parts[-1]
    file_name_parts = file_name.split(sep='.')
    return _path, file_name_parts[0], file_name_parts[1]

Answer 3

Go to https://github.com/opencv/opencv/blob/master/samples/python/common.py download this file or you can just copy this code and paste it into calibrate.py

• Here is the code copied from commom.py and paste it in calibrate.py

def splitfn(fn):
    path, fn = os.path.split(fn)
    name, ext = os.path.splitext(fn)
    return path, name, ext