Feature Image Cannot showing Title of Image

This is my theme code

<?php if ( has_post_thumbnail() ) {
				the_post_thumbnail('thumb-large');
				$caption = get_post(get_post_thumbnail_id())->post_excerpt;
				if ( isset($caption) && $caption ) echo '<div class="image-caption">'.$caption.'</div>';
			} ?>
		</div>
	</div>

<?php endif; ?>

i cannot add title image, how to insert (title) of image for this code…?
Thanks be4, sorry for bad English…