opencv image encodeing returns array, instead of buffer












0














I am having a problem with converting encoded image to string. I encode as below:



image = cv2.imread(imagePath)
_, buffer = cv2.imencode('.png', image)


When I try to call, buffer.toString(), I get the following error:



AttributeError: 'numpy.ndarray' object has no attribute 'toString'


There are many questions on stackoverflow related to the same functionality that I am doing(Encoding with opencv). The following are few, which has contradicting answers.




  1. https://stackoverflow.com/a/25592959/7621143


In this answer, it is implied that imencode returns a tuple, with 2 elements:



>>> img_str = cv2.imencode('.jpg', img)[1].tostring()
>>> type(img_str)
'str'



  1. https://stackoverflow.com/a/17970817/7621143


Another answer to the same question, implies that the result is one value.



Anyway, in my case, the return value is a tuple with 2 elements, where the 2nd one is an ndarray, which doesn't have toString() method.



FWIW,



$ pip show opencv-python
Name: opencv-python
Version: 3.4.3.18
$ pip show numpy
Name: numpy
Version: 1.15.4


OpenCV documentation for imencode says, the return value is a tuple with 2 elements & the 2nd one is buffer.



Python: cv2.imencode(ext, img[, params]) → retval, buf


Any suggestions are appreciative, to resolve this issue.










share|improve this question





























    0














    I am having a problem with converting encoded image to string. I encode as below:



    image = cv2.imread(imagePath)
    _, buffer = cv2.imencode('.png', image)


    When I try to call, buffer.toString(), I get the following error:



    AttributeError: 'numpy.ndarray' object has no attribute 'toString'


    There are many questions on stackoverflow related to the same functionality that I am doing(Encoding with opencv). The following are few, which has contradicting answers.




    1. https://stackoverflow.com/a/25592959/7621143


    In this answer, it is implied that imencode returns a tuple, with 2 elements:



    >>> img_str = cv2.imencode('.jpg', img)[1].tostring()
    >>> type(img_str)
    'str'



    1. https://stackoverflow.com/a/17970817/7621143


    Another answer to the same question, implies that the result is one value.



    Anyway, in my case, the return value is a tuple with 2 elements, where the 2nd one is an ndarray, which doesn't have toString() method.



    FWIW,



    $ pip show opencv-python
    Name: opencv-python
    Version: 3.4.3.18
    $ pip show numpy
    Name: numpy
    Version: 1.15.4


    OpenCV documentation for imencode says, the return value is a tuple with 2 elements & the 2nd one is buffer.



    Python: cv2.imencode(ext, img[, params]) → retval, buf


    Any suggestions are appreciative, to resolve this issue.










    share|improve this question



























      0












      0








      0







      I am having a problem with converting encoded image to string. I encode as below:



      image = cv2.imread(imagePath)
      _, buffer = cv2.imencode('.png', image)


      When I try to call, buffer.toString(), I get the following error:



      AttributeError: 'numpy.ndarray' object has no attribute 'toString'


      There are many questions on stackoverflow related to the same functionality that I am doing(Encoding with opencv). The following are few, which has contradicting answers.




      1. https://stackoverflow.com/a/25592959/7621143


      In this answer, it is implied that imencode returns a tuple, with 2 elements:



      >>> img_str = cv2.imencode('.jpg', img)[1].tostring()
      >>> type(img_str)
      'str'



      1. https://stackoverflow.com/a/17970817/7621143


      Another answer to the same question, implies that the result is one value.



      Anyway, in my case, the return value is a tuple with 2 elements, where the 2nd one is an ndarray, which doesn't have toString() method.



      FWIW,



      $ pip show opencv-python
      Name: opencv-python
      Version: 3.4.3.18
      $ pip show numpy
      Name: numpy
      Version: 1.15.4


      OpenCV documentation for imencode says, the return value is a tuple with 2 elements & the 2nd one is buffer.



      Python: cv2.imencode(ext, img[, params]) → retval, buf


      Any suggestions are appreciative, to resolve this issue.










      share|improve this question















      I am having a problem with converting encoded image to string. I encode as below:



      image = cv2.imread(imagePath)
      _, buffer = cv2.imencode('.png', image)


      When I try to call, buffer.toString(), I get the following error:



      AttributeError: 'numpy.ndarray' object has no attribute 'toString'


      There are many questions on stackoverflow related to the same functionality that I am doing(Encoding with opencv). The following are few, which has contradicting answers.




      1. https://stackoverflow.com/a/25592959/7621143


      In this answer, it is implied that imencode returns a tuple, with 2 elements:



      >>> img_str = cv2.imencode('.jpg', img)[1].tostring()
      >>> type(img_str)
      'str'



      1. https://stackoverflow.com/a/17970817/7621143


      Another answer to the same question, implies that the result is one value.



      Anyway, in my case, the return value is a tuple with 2 elements, where the 2nd one is an ndarray, which doesn't have toString() method.



      FWIW,



      $ pip show opencv-python
      Name: opencv-python
      Version: 3.4.3.18
      $ pip show numpy
      Name: numpy
      Version: 1.15.4


      OpenCV documentation for imencode says, the return value is a tuple with 2 elements & the 2nd one is buffer.



      Python: cv2.imencode(ext, img[, params]) → retval, buf


      Any suggestions are appreciative, to resolve this issue.







      python numpy opencv






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 23 at 7:05









      petezurich

      3,50581734




      3,50581734










      asked Nov 23 at 6:34









      explorer

      498411




      498411
























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          The error clearly says:




          AttributeError: 'numpy.ndarray' object has no attribute 'toString'




          which means that you have mis-spelled the method. Replace toString with tostring to get the desired results.






          share|improve this answer





















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            1 Answer
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            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            2














            The error clearly says:




            AttributeError: 'numpy.ndarray' object has no attribute 'toString'




            which means that you have mis-spelled the method. Replace toString with tostring to get the desired results.






            share|improve this answer


























              2














              The error clearly says:




              AttributeError: 'numpy.ndarray' object has no attribute 'toString'




              which means that you have mis-spelled the method. Replace toString with tostring to get the desired results.






              share|improve this answer
























                2












                2








                2






                The error clearly says:




                AttributeError: 'numpy.ndarray' object has no attribute 'toString'




                which means that you have mis-spelled the method. Replace toString with tostring to get the desired results.






                share|improve this answer












                The error clearly says:




                AttributeError: 'numpy.ndarray' object has no attribute 'toString'




                which means that you have mis-spelled the method. Replace toString with tostring to get the desired results.







                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 23 at 6:52









                ZdaR

                12.9k33453




                12.9k33453






























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