php - process url with filename extension with laravel -

i using laravel 4.2 , nginx, when process request '/img/300/200/dummy.png' laravel controller, seems go files under public folder , , not trig laravel route. how can write controllers process such url?

probably have in nginx config like:

location ~* \.(jpg|jpeg|gif|png)$ {   add_header   pragma public;   add_header   cache-control "public";   expires      max; } 

so nginx serves images directly without requesting php-fpm , laravel.