I need to extract a red laser line on an object from an image with python. I want to use the shape of the line to determine if the object is flat or tapered, and if it's tapered, on which side. In what way can I do it, can you post some example code?
OpenCV has great tools to solve this. Extract the red channel from the color image (2nd image below). Threshold this image with a threshold value of about 220 (3rd image below). Do a couple rounds of dilation to fill in holes left by threshold (4th image below) After this, get the contours and pick out the top one (smallest center y value). Divide this top contour in half to get 2 contours - a left side and a right side. Then look at the aspect ratios of these 2 contours. A flat line will have a larger wd/ht ratio.
Asked: Apr 20 '19
Seen: 2,729 times
Last updated: Apr 24 '19
