How to check if an image contains an element I am searchig for

[Arak Rachael]

Hi guys,

I have an image from google maps to say and I need to check if it has road markings, in order to do that, I believe I need to change the effects on the image so the markings and road can be white or something and the things I don't need like cars, trees and so on to be black.

images should contain only road surface and/or road markings (lines, zebras, stripes.

Can anyone help me on this, I already have the crop code, I just need to check if the cropped part contains what I need.