컨트롤러
public function write()
 {
  $this->output->enable_profiler(TRUE);
  $this->load->library('form_validation');

  //폼 검증할 필드와 규칙 사전 정의
  $this->form_validation->set_rules('subject','제목','required');
  $this->form_validation->set_rules('contents','내용','required');

  if( $this->form_validation->run() == FALSE )
  {
   $this->load->view('image/image_write_v');
  }
  else
  {
   $config = array(
   'upload_path' => 'uploads/',
   'allowed_types' => 'gif|jpg|png',
   'encrypt_name' => TRUE,
   'max_size' => '1000'
   );

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

   if(!$this->upload->do_upload())
   {
    $data['error'] = $this->upload->display_errors();

    $this->load->view('image/image_write_v',$data);
   }
   else
   {
    $upload_data = $this->upload->data();

    $upload_data['subject'] = $this->input->post('subject',TRUE);
    $upload_data['contents'] = $this->input->post('contents',TRUE);
    $upload_data['user_name'] = $this->input->post('name');
    $upload_data['user_id'] = $this->input->post('username');

    $result = $this->image_m->insert_image($upload_data);

    redirect('/image'); exit;
   }
  }  
 }

모델
 function insert_image($arrays)
 {
  $detail = array(
   'file_size'=>(int)$arrays['file_size'],
   'image_width'=>$arrays['image_width'],
   'image_height'=>$arrays['image_height'],
   'file_ext'=>$arrays['file_ext']
   );

  $insert_array = array(
   'user_id' => $arrays['user_id'],
   'user_name' => $arrays['user_name'],
   'subject' => $arrays['subject'],
   'contents' => $arrays['contents'],
   'file_path' => $arrays['file_path'],
   'file_name' => $arrays['file_name'],
   'original_name' => $arrays['original_name'],
   'detail_info' => serialize($detail),
   'reg_date' => date("Y-m-d H:i:s")
   );

  $this->db->insert('image',$insert_array);

  $result = $this->db->insert_id();

  return $result;
 }

뷰
<article id="board_area">
 <header>
  <h1></h1>
 </header>
<?php
$attributes = array('class' => 'form-horizontal','id'=>'upload_action');
echo form_open_multipart('/image',$attributes);
?>
 <fieldset>
  <legend>이미지 게시판 글쓰기</legend>
  <div class="control-group">
    <label class="control-label" for="input01">제목</label>
    <div class="controls">
     <input type="text" class="text" id="input01" name="subject">
    <p class="help-block">게시물의 제목을 써주세요</p>
   </div>
   <label class="control-label" for="input02">내용</label>
   <div class="controls">
    <textarea id="input02" cols='100' rows="25" name="contents"></textarea>
    <p class="help-block">게시물의 내용을 써주세요.</p>
   </div>
   <label class="control-label" for="input03">사진 업로드</label>
   <div class="controls">
    <input type="file" class="input-xlarge" id="input03" name="userfile" value="<?php echo set_value('userfile');?>">
    <p class="help-block">파일을 선택해주세요</p>
   </div>   
  <div class="form-actions">
   <button type="button" class="btn btn-primary" id="write_btn">작성</button>
   <input type="button" class="btn" value="취소" onclick="history.back()">
  </div>
  </div>
 </fieldset>
 </form>
</article>