Extending a line till start and impose over an image

I have points

x1, y1 , x2, y2 for both left and right side lanes. However I want to extend these points so that it shows like the second image.

I can find slope and b however I am not sure how can i impose my lane like second image

Answer 1

[Abdul Rehman]

Bro ask question clearly..!

According my understanding simply convert image into gray(0 to 255) image and then at that white line pixels having high values (255),then you have to apply box filter and then apply thresholding,then you get what you want.

if true %RGB image is input image I = rgb2gray(RGB) %filter for Smoothness & Removing finner detail. %Thresholding end

gray Image: https://in.mathworks.com/help/matlab/ref/rgb2gray.html

thresholding: https://in.mathworks.com/discovery/image-thresholding.html

filter: https://in.mathworks.com/help/images/ref/imboxfilt.html