CODEWITHSUNDEEP
opencv
user1482031
user1482031

Reputation: 71

Pixel Intensity in opencv#

I am a beginner in both Image Processing and Opencv. I am trying to find out the individual pixel intensities of an image, using OPENCV#. There is assistance here: http://docs.opencv.org/doc/user_guide/ug_mat.html?highlight=pixel%20intensity for the same issue. But I am not sure how to use it in OPENCV#. I know this is a very basic query. Please try to help out. Thanks in advance.

Upvotes: 4

Views: 16202

Answers (2)

tkefauver
tkefauver

Reputation: 518

Pixel intensity is the same thing as that pixel's grayscale value. To get a grayscale (pixel intensity) version of an BGR image you can do this:

cv::cvtColor(bgr_mat,gray_mat,CV_BGR2GRAY);

Now the 3 channel BGR image has been converted to a 1 channel GRAYSCALE image. To find the intensity of pixel (x,y) in the gray image you can do this:

//NOTE: in OpenCV pixels are accessed in (row,col) format
int intensity = (int)gray_mat.at<uchar>(y,x);

Since each grayscale pixel is stored as uchar, the value of intensity will range from (0-255) where 255 is maximum intensity (seen as a completely white pixel).

Upvotes: 4

plan9assembler
plan9assembler

Reputation: 2974

in emgu cv, you can do it like this.

//Color
//Red 
byte Red_val = My_Image.Data[y,x,0];
//Green 
byte Green_val = My_Image.Data[y,x,1];
//Blue 
byte Blue_val = My_Image.Data[y,x,2];

//Greyscale
byte Gray_val = My_Image.Data[y,x,0];

Upvotes: 1

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