PHPExcel : Image is not inserting in excel file - php

Question

This is my code,
Please tell me what am I missing?
// Field names in the first row
$sql1 = "SELECT `COLUMN_NAME`
FROM `INFORMATION_SCHEMA`.`COLUMNS`
WHERE `TABLE_SCHEMA`='test'
AND `TABLE_NAME`='user_tab'";
$res1 = mysql_query($sql1);
while ($row2 = mysql_fetch_assoc($res1)) {
$fields[] = $row2['COLUMN_NAME'];
}
//Data
$sql = "SELECT * FROM user_tab";
$res = mysql_query($sql);
echo date('H:i:s'), " Load from Excel5 template", EOL;
$objReader = PHPExcel_IOFactory::createReader('Excel5');
$objPHPExcel = $objReader->load("mytest.xls");
$logo = new PHPExcel_Worksheet_HeaderFooterDrawing();
$logo->setName('Logo');
$logo->setPath('image.jpg'); //Path is OK & tested under PHP
$logo->setHeight(38); //If image is larger/smaller than that, image will be proportionally resized
$objPHPExcel->getActiveSheet()->getHeaderFooter()->addImage($logo, PHPExcel_Worksheet_HeaderFooter::IMAGE_HEADER_LEFT);
echo date('H:i:s'), " Add new data to the template", EOL;
$col = 0;
foreach ($fields as $key => $value) {
$objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, 1, $value);
$col++;
}
$row = 2;
while ($row_data = mysql_fetch_assoc($res)) {
$col = 0;
foreach ($row_data as $key => $value) {
$objPHPExcel->getActiveSheet()->setCellValueByColumnAndRow($col, $row, $value);
$col++;
}
$row++;
}
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save(str_replace('.php', '.xls', __FILE__));