How to retrieve contacts from android CWM backup

1) Connect the phone to PC in USB storage mode and get the data.img from the cwm backup
 cp /media/clockworkmod/data.img . 

2) compile and build unyaffs which is need to retrieve the files from data.img 
download unyaffs.c, unyaffs.h from http://code.google.com/p/unyaffs/downloads/list 
wget http://unyaffs.googlecode.com/files/unyaffs.c
wget http://unyaffs.googlecode.com/files/unyaffs.h
gcc -o unyaffs unyaffs.c 
unyaffs data.img 

3) after extracting the image browse the contact database location
cd data/com.android.providers.contacts/databases 

4) use sqlite3 command line client to read the table of contacts 
sqlite3 contacts2.db 
sqlite> select number,name from view_v1_phones;