[Header Already sent Problem For Images]

Hi, Before listing my problem I would excuse for my English... because i am not a native english speaker
I am trying to read an image from the client side and read the contents of the images through

[COLOR=blue]
<?php
$picture =  $_FILES["picture"]["tmp_name"];
$fp = fopen($picture,"r");
$content = fread( $fp,filesize($picture) );
?>
[/COLOR]

Now I am trying to display Image inside a table like
  [COLOR=seagreen]<table>
    <tr>
        <td>[COLOR=red]<?php
            header("Content-type:image/jpeg");
            echo($content);
            ?>[/COLOR]
        </td>
    </tr>
  </table>[/COLOR]
When I try put the header("Content-type:image/jpeg"); line then it says that header already sent error message.

When I try to avoid this i use ob_start() and ob_flush() to display the image, but it only prints the URL from the address bar of the browser. But if I send header("Location:someotherpage.php"); It works well
So Is there any solution for this problem to display the Images header inside the html page