heres my piece of code in the controller

	public function addNewUser() {



    $this->load->helper(array('form','file','url'));

    $config_image = array();
    $config_image['upload_path'] = './assets/uploads';
    $config_image['allowed_types'] = 'gif|jpg|png|jpeg';
    $config_image['max_size'] = '1024';
    $this->load->library('upload', $config_image);


    if (! $this->upload->do_upload('profilepic') ){
    	$upload_data = $this->upload->data();
   		$file_name = $upload_data['file_name'];

   		$data = array(
	    	'success' => 1
	    );
    }else{
    	$upload_data = $this->upload->data();
   		$file_name = $upload_data['file_name'];
   		$this->image_resize($upload_data['full_path'], $file_name);

   		$data = array(
	    	'success' => 1
	    );
    }

$img = array(
    'profilepic' => $file_name
    );
$fname = $this->input->post('txtfname');
$mname = $this->input->post('txtmname');
$lname = $this->input->post('txtlname');
$email = $this->input->post('txtemail');
$user = $this->input->post('txtuser');
$pass = $this->input->post('txtpass');
$position = $this->input->post('txtposition');
$schoolID = $this->input->post('txtschoolID');

$this->model->addNewUser($fname, $mname, $lname, $email, $user, $pass, $position, $schoolID, $img);


generate_json($data);

}

public function image_resize($path, $file){
	$config_resize = array();
	$config_resize['image_library'] = 'gd2';
	$config_resize['source_image'] = $path;

	$config_resize['maintain_ratio'] = TRUE;
	$config_resize['width'] = 75;
	$config_resize['height'] = 50;
	$config_resize['new_image'] =  '../assets/uploads'.$file;
	$this->load->library('image_lib',$config_resize);
	$this->image_lib->resize();

}