I'm trying to learn how to use opencv in python and having some difficulties, and also I'm a newbie at python too.
Here is my question :
I want to convert a jpg file tp png. Simple and clear. But when I run this code :
from opencv import _cv from opencv.highgui import cvSaveImage, cvLoadImage cvSaveImage("bet.jpg",cvLoadImage("bet.jpg")) if __name__ == '__main__': pass
It gives this error which I don't understand :
Traceback (most recent call last): File "convert.py", line 6, in <module> cvSaveImage("bet.jpg",cvLoadImage("bet.jpg")) File "/usr/lib/pymodules/python2.6/opencv/highgui.py", line 183, in cvSaveImage return _highgui.cvSaveImage(*args) RuntimeError: openCV Error: Status=Null pointer function name=cvGetMat error message=NULL array pointer is passed file_name=cxarray.cpp line=2780
I have my picture with the same folder of source code and the name of the image is bet.jpg
Any idea ??
I solved the problem, the image I took randomly from the Google Images doesn't load. Maybe it's encrypted or something I don't know. I tried it with other images, and worked very well. So watch out while copying images : )
The best choice is pyopencv:
import pyopencv as cv img = cv.imread('01.png') cv.imshow('img-windows',img) cv.waitKey(0) cv.imwrite('01.png',img)