How to write image to catalog using imwrite OpenCV 3.1?

Question

I have to write an image to subdirectory "pat" using OpenCV. The subdirectory is located in project folder. I tried:

imwrite("../../pat/Gray_Image.jpg", image_source);
imwrite("../pat/Gray_Image.jpg", image_source);
imwrite("/pat/Gray_Image.jpg", image_source);
imwrite("\\pat\\Gray_Image.jpg", image_source);
imwrite("//pat//Gray_Image.jpg", image_source);
imwrite("\pat\Gray_Image.jpg", image_source);

I do not understand why i am wrong.

Answer 1

Solution found. OpenCV using only full path.