Hello, everyone!
I need to get color values(HEX) of specific pixels from live video capture. I have used simpleBlobDetector to get coordinates with Python. How can I do it?
Thanks in advance.
Note: I am kinda new to opencv and forum. If I had ask question in not a proper way, please warn.
it is probably easier, than you thought:
in python, images are just numpy arrays, so you could access a single pixel at x,y like:
color = image[y,x] # row major, like in opencv
given a bgr image (3 channels), you'll recieve a tuple, such as:
(12,156,222)
to get a single hex value from that:
hex = (color[0] << 16) + (color[1] << 8) + (color[2])
If you're using Mat and image is gray
You can use : pixel value = image.at<unsigned char="">(cv::Point(x,y)) ;
if you're dealing with color images
channel1_value = image.at<vec3b>(cv::Point(x, y))[0] ;
Then pass your coordinates to Point(x,y).
Hope it helps.
Asked: 2017-08-08 14:59:49 -0600
Seen: 23,793 times
Last updated: Aug 09 '17
Do you want to find the pixel value with coordinates by clicking on it?
Not by clicking, coordinates come from blob detector as keypoints for x and y axis.