upload image thumbs can resize as exactly measure ??

Code:
public function do_upload()

             {

                

                  $identifiant_chaussure = $this->input->post('identifiant');

                  

                  

                //  echo ('identifiant '.$identifiant_chaussure) ;  exit ;

                  

                

                $config['upload_path'] = './image/';

                $config['allowed_types'] = 'gif|jpg|png';

                $config['max_size']     = '0';

                $config['max_width']  = '0';

                $config['max_height']  = '0';

                

                $config['encrypt_name'] = true ;

                

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

        

                if ( ! $this->upload->do_upload())

                {

                        $error = array('error' => $this->upload->display_errors());

                        

                        $this->load->view('image_view', $error);

                }       

                else

                {

                        // $data = array('upload_data' => $this->upload->data());

                        

                        $data = $this->upload->data();

                        

                        

                        

                        // print_r($data);exit ;

                        

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

                        

                         $source = element('full_path',$data);

                        

                        

                        $config['image_library'] = 'gd2';

                        $config['source_image'] = $source;

                        $config['new_image'] = './image/thumbs/';

                        $config['create_thumb'] = TRUE;

                        $config['thumb_marker']='';

                        $config['maintain_ratio'] = TRUE;

                        $config['width'] = 350;

                        $config['height'] = 225;



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



                        $this->image_lib->resize();

                        

                        

                        

                        $nom_path = element('file_name',$data);

                        

                       // echo $nom_path ;

                      //  echo ('identifiant '.$identifiant_chaussure) ;  exit ;

                      

                      

                      $this->site_model->ajoutImages($nom_path , $identifiant_chaussure);

       

       

                      

                     // redirect('site');

      

      

        $data['identifiant']=  $identifiant_chaussure ;

                      

                    

                      

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

                        

                        

                            

                        

                        

                        

  }

                

                

                

             }