Get image url from model good practice?

it was never intended to (ab)use Data Objects to load Views
you should pass your prepared data array from a model to a controller
and in your controller load the view - as described by many many users here

if you want to follow my approach it is a bad practice to load views in a data Object like you do in your Proprietati_Object
The purpose of a data object is to clean up your models and let the objects do all the work which are related to the Objects Data

a simple example would be:
if your database contains 2 columns discount and price and you want the calculated price - than your object can do the work

PHP Code:

class Proprietati_Object
{

    public $discount = 10;
    public $price = 20;

    public function __construct(){

            $this->_ci = get_instance();
    }
    
    public function getPrice()
    {
        return ($this->price * ((100 - $this->discount) / 100));
    }
} 


and i don't quite get your adaption of the autoloader function

PHP Code:

   public function autoloadCoreObjects($class)
    {
        $path = array(
            'objects/',
        );

        $class = explode('_', $class);
        foreach($path as $dir) {
            if (file_exists(APPPATH.$dir.$class[0]."_Object".'.php'))
                require_once(APPPATH.$dir.$class[0]."_Object".'.php');
        }
    } 


this does the same as my posted function except the fact that you use for some weird reason explode to split the name in 2 partials.