Converting OpenCV code snippet from C++ to Python

Question

I'm trying to convert this code to python.
can anyone help me?

    cv::Mat image;
while (image.empty()) 
{
    image = cv::imread("capture.jpg",1);
}
cv::imwrite("result.jpg",image);
`

@IronManMark20 : Initially, there is no image, so i have to wait until the image come. — Ali Dhouib
– Ali Dhouib, Commented May 22, 2015 at 21:31

Glorfindel · Accepted Answer · 2023-01-18 20:03:40Z

1

In Python the Mat of C++ becomes a numpy array and hence the image manipulation becomes as simple as accessing a multi dimensional array. However the methods name are same in both C++ and Python.

import cv2 #importing opencv module

img = cv2.imread("capture.jpg", 1) #Reading the whole image

cv2.imwrite("result.jpg", img) # Creating a new image and copying the contents of img to it

EDIT: If you want to write the contents as soon as the image file is being generated then you can use os.path.isfile() which return a bool value depending upon the presence of a file in the given directory.

import cv2 
import os.path

while not os.path.isfile("capture.jpg"):
    #ignore if no such file is present.
    pass

img = cv2.imread("capture.jpg", 0)

cv2.imwrite("result.jpg", img)

You can also refer to docs for detailed implementation of each method and basic image operations.

edited Jan 18, 2023 at 20:03

Glorfindel

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answered May 22, 2015 at 14:47

ZdaR

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5 Comments

Ali Dhouib Over a year ago

there is no while loop in this code and i need the presence of the while loop in my coding

ZdaR Over a year ago

But why ? @AliDhouib why are you making it complex ? it will serve it's purpose, try running it. please explain me the context ?

Ali Dhouib Over a year ago

I have to wait until the program receive an image, it comes from another process throw a server! so i have to repeat reading the image from the path until it becomes true. And after reading that image, i have another process in this same program.

Ali Dhouib Over a year ago

can you help me? any idea?

IronManMark20 Over a year ago

I will point you to here:stackoverflow.com/questions/23628325/…

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