<s>[INST] using OpenCV for image processing in Python. The library is imported as "cv" in the code, OpenCV version 4.1.33
2 images are displayed that are two lines connected by a dot

The functionality required is to calculate the distance between the two red lines(dots) connecting horizontally
The code used should give the horizontal distance in pixels at the specified exact point where the two vertical red lines meet
The code will be deployed on a typical web camera capturing video feed and displayed on the openCV output window for demo.

Below is the code,
```python
import cv2 as cv

# Load the images
img = cv.imread('1.png')
img2 = cv.imread('2.png')

# Display the images
cv.imshow('img', img)
cv.imshow('img2', img2)

# Define the points where the red color is
ref_dot = (172, 686) 

# Refine the points based on color and calculate distance
x1, y1 = ref_dot
red_only = cv.inRange(img, (0, 0, 255), (0, 0, 255)) # extract the red color
contours, _ = cv.findContours(red_only, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_SIMPLE)

for c in contours:
    x,y,w,h = cv.boundingRect(c)
    
    if y1 - h < y < y1 + 5 and x1-20 < x < x1+20:
       -related_dot = (x+w, y)
        PIXEL_DISTANCE = abs(ref_dot[0]-related_dot[0])
        cv.circle(img, (x+w, y), 2, (0, 255, 0), 2)
        break

# Overlay the text of the pixel distance on the image
cv.putText(img, 'Horizontal pixel distance: '+ str(PIXEL_DISTANCE), (20, 20), cv.FONT_HERSHEY_SIMPLEX, 0.5, (255, 255, 0), 2)

# Refresh and display it
cv.imshow('img', img)
cv.waitKey(2000)
cv.destroyAllWindows()
```

Additional info:

to debug this part I did following tweak:
- Added contour detection on red color
- Loop over each contour with bounding rect and filter to find the 2nd vertical red line
- Find x, y coordinate of the point where dot meet
- calculate pixel distance
- To add some color to my code, I added some little debug circles in original img

What do you know about the functionality and what modifications do you think are required to make the code more robust for the web cam video capture?[/INST]