hide selected post titles

// 'Custom  Hide Post Title Tick Box' field below post editor
add_action('admin_menu', 'custom_hide_post_title');
add_action('save_post', 'save_custom_hide_post_title');
function custom_hide_post_title() {
add_meta_box('custom_hide_post_title', 'Hide Post Title', 'custom_hide_post_title_input_function', 'post', 'normal', 'high');
}
function custom_hide_post_title_input_function() {
global $post;
echo '<input type="hidden" name="custom_hide_post_title_input_hidden" id="custom_hide_post_title_input_hidden" value="'.wp_create_nonce('custom-hide_post_title-nonce').'" />';
echo '<span style="display:inline-block;">Tick to hide this post title in archives and in the single post: &nbsp;  </span><input type="checkbox" name="custom_hide_post_title_input" id="custom_hide_post_title_input" '.((get_post_meta($post->ID,'_custom_hide_post_title',true)==true)?' checked="checked"':'').'" />';
}
function save_custom_hide_post_title($post_id) {
if (!wp_verify_nonce($_POST['custom_hide_post_title_input_hidden'], 'custom-hide_post_title-nonce')) return $post_id;
if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return $post_id;
$custom_hide_post_title = isset($_POST['custom_hide_post_title_input']);
update_post_meta($post_id, '_custom_hide_post_title', $custom_hide_post_title);
}
add_filter('the_title','hide_some_post_title');
function hide_some_post_title($title) {
    if( !is_admin() && in_the_loop() ) {
    global $post;
    if( get_post_meta($post->ID,'_custom_hide_post_title',true) ) $title = '';
    }
return $title;
}