Easy BGR to Grayscale conversion

asked 2014-05-24 16:53:22 -0600

Marsstar
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I want to convert an image to Grayscale using this simple code using the new C++ API --> found on the OpenCV original documentation page.

Link: http://docs.opencv.org/doc/tutorials/introduction/load_save_image/load_save_image.html

I don't know which one is a placeholder and which one is not.

The changes I made are marked by a pink rectangle. -Are those changes correct?

This is the original code, that was online at the documentation page:

image description

This is the changed code by myself:

image description

Do I have to link the cv.h or cv.hpp, because I've heard, that the GCC compiler only takes .hpp files since its made for C++ and not C. Am I correct?

Thanks.

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hi alex,

there is no <opencv/cv.hpp> header, you need <opencv2/core/core.hpp> and <opencv2/imgproc/imgproc.hpp>
if you want to hardcode the image names, skip the 1st line in main (it's wrong anyway).

and the next time, screenshots look nice, but we can't copy/paste your code to correct it

berak ( 2014-05-24 23:19:27 -0600 )edit

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Mat img = imread ("E:\\lena.jpg"); // input image Mat gray_img; // image where result will save cvtColor(img , gray_img ,CV_BGR2GRAY) ; // this line convert your image from BGR2GRAY imwrite("E:\\gray_img.jpg" , gray_img); // is used to save the image in your directory imshow("img" , gray_img) ; // this line show you the gray image as output

Easy BGR to Grayscale conversion

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Easy BGR to Grayscale conversion