Opencv: three gray algorithms for color images

In order to accelerate the processing speed in the image processing algorithm, color images often need to be converted into gray images. 24 represents each pixel of a color image in three bytes. Each byte corresponds to the brightness of the RGB component.

When the RGB component value is different, it is displayed as a color image. When the RGB component is the same, it is converted into a gray image:

Generally, there are three conversion formulas.

(1) Gray (I, j) = [R (I, j) + g (I, j) + B (I, j)]/3;

(2) Gray (I, j) = 0.299 * R (I, j) + 0.587 * g (I, j) + 0.144 * B (I, j );

(3) Gray (I, j) = g (I, j); // from 2, we can see that G has a large component, so we can directly use it instead.

The following code is used:

1 # include <cv. h> 2 # include 
Original Image:

Grayscale image generated by algorithm 1:

Grayscale image generated by algorithm 2:

Grayscale image generated by algorithm 3: