Source Encoder and Decoder Models Source encoder f(x,y) Mapper Quantizer Symbol encoder Reduce Reduce Reduce interpixel psychovisual coding redundancy redundancy redundancy Source decoder 子(x,y) Inverse mapper Symbol decoder Source Encoder and Decoder Models f (x, y) Mapper Quantizer Symbol encoder Source encoder Inverse mapper Symbol decoder Source decoder ( , ) ˆ f x y Reduce interpixel redundancy Reduce psychovisual redundancy Reduce coding redundancy