How Do I Get The Pixel Value At A Particular Row And Column In C++ Using Opencv

Question

1.00/5 (1 vote)

See more:

So, i have a Mat image and i want to know the BGR value at a specific row and column in the image.
Here is the code that i tried but its not giving me correct values.

int newval[3];

img.at<cv::vec3b xmlns:cv="#unknown">(100,100)[0] = newval[0];
img.at<cv::vec3b>(100,100)[1] = newval[1];
img.at<cv::vec3b>(100,100)[2] = newval[2];

Please can anyone help me out. Thanks

Posted 11-Jul-14 10:21am

Surajit Das

Add a Solution

Comments

[no name] 11-Jul-14 18:30pm

"not giving me correct values"... I am not really surprised. It looks like you are trying to set the values not get the values. And, you are setting the values with garbage values since you did not initialize newval to anything.

2 solutions

Add a Solution

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Member 12270687 · Answer 1 · 2016-01-18T02:19:00

Solution 1

Vec3b intensity = img.at<vec3b>(y, x);
uchar blue = intensity.val[0];
uchar green = intensity.val[1];
uchar red = intensity.val[2];

Try using this.

Posted 18-Jan-16 2:19am

Member 12270687

CPallini · Answer 2 · 2016-01-18T02:15:00

Solution 2

See this Stack Overflow question: "c++ - OpenCV get pixel channel value from Mat image - Stack Overflow"[^].

Posted 18-Jan-16 2:15am

CPallini

How Do I Get The Pixel Value At A Particular Row And Column In C++ Using Opencv

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

How Do I Get The Pixel Value At A Particular Row And Column In C++ Using Opencv

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0

Existing Members

...or Join us