Following is the code which resize the image, but here i am not able to resize the image

function processHome(){  
    $this->load->library('image_lib');

    $img_path =  base_url().'img/image/50X50/ori.jpeg';

    $config['image_library'] = 'gd2';
    $config['source_image'] = $img_path;
    $config['create_thumb'] = TRUE;
    $config['maintain_ratio'] = TRUE;
    $config['width'] = 50;
    $config['height'] = 50;

    $this->load->library('image_lib', $config);  
    $this->image_lib->resize();

    if ( ! $this->image_lib->resize()){
        echo $this->image_lib->display_errors();
    }

    echo "No error";
    exit;

    $this->load->view('index', $data); 
}