Algorithm 1 Frei-Chen compression technique
 1: Input: Image I⁠, Frei Chen basis (⁠w1⁠,…,w9⁠) 
 2: For every 3×3 block in image I do 
 3: project every block with w1⁠,…,w9 
 4: If w9 project is the largest then 
 5: replace the block by the average value 
 6: else 
 7: keep the block unchanged 
 8: end if 
 9: end for 

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