apache - How to use Mod_ Headers and Mod_ Expires to cache

I want to cache images and other files on my site, so what I did is made sure mod_headers and mod_expires with :-

/usr/sbin/httpd -l

then edited .htaccess to be:-

ExpiresActive On
ExpiresDefault A0


# Set up caching on media files for 1 year (forever?)
<FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav)$">
ExpiresDefault A29030400
Header append Cache-Control "public"
</FilesMatch>

# Set up caching on media files for 1 week
<FilesMatch "\.(gif|jpg|jpeg|png|swf)$">
ExpiresDefault A604800
Header append Cache-Control "public"
</FilesMatch>

# Set up 2 Hour caching on commonly updated files
<FilesMatch "\.(xml|txt|html|js|css)$">
ExpiresDefault A9200
Header append Cache-Control "proxy-revalidate"
</FilesMatch>

# Force no caching for dynamic files
<FilesMatch "\.(php|htm)$">
ExpiresActive Off
Header set Cache-Control "private, no-cache, no-store, proxy-revalidate, no-transform"
Header set Pragma "no-cache"
</FilesMatch>

<Files 403.shtml>
order allow,deny
allow from all
</Files>

But when I browse the site, every time the images reload and take too much time. Is there anything else I should do?

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