CODEWITHSUNDEEP
opencv
Berkay
Berkay

Reputation: 13

How to use Mat img on all function without calling function?

I want to use image which I used by Mat img=imread("Nature.jpg"); to inside of all functions that are in the program, I think, this can be implemented as Mat img is defined such volatile variable, is this posible?

Upvotes: 0

Views: 129

Answers (1)

Roger Figueroa Quintero
Roger Figueroa Quintero

Reputation: 368

I would not recommend to declare a variable cv :: Mat as volatile, because if you are doing this surely these need to update this variable from different threads, if what you want is to use a type cv :: Mat global then type the following line outside of any function or class

cv::Mat img;

Now if you want to use this variable from another file you must write:

extern cv::Mat img;

Now if you need access multithreaded I recommend you look for a guide on mutex and multithreaded programming, because if two or more functions access the variable img at the same time your program will fail at runtime by segmentation violation.

Upvotes: 1

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