Only keep the White shoulder marking and erase everything else

I used edge detection to find the shoulder marking . A threshold of 0.6 but the surrounding trees are also included. How to Threshold in such a way that objects between 0.6 and 0.7 are only retained in the output image.

Answer 1

[Image Analyst]

Your algorithm is way too simplistic. It won't be robust at all. The algorithms you need will be listed in papers here: http://www.visionbib.com/bibliography/contentsactive.html#Active%20Vision,%20Camera%20Calibration,%20Mobile%20Robots,%20Navigation,%20Road%20Following

[MJ Thangaraj]

It's lane detection,but I want to get those lanes as lines and then Find the end co-ordinates of those lines.

[Image Analyst]

Yes. My answer still applies.