Scaling filter and method thereof

A scaling filtering method comprising:

• buffering a plurality of pixel values corresponding to a plurality of source pixels, respectively;
• multiplexing the pixel values to output (N+1) intermediate values, respectively, wherein N is an integer;
• multiplying N corresponding intermediate values out of the (N+1) intermediate values by specific factors to generate N multiplied values, respectively;
• and
• summing a 1st intermediate value out of the (N+1) intermediate values and the N multiplied values to generate a new pixel value.

A scaling filter comprising:

• two line buffers for buffering a plurality of pixel values corresponding to a plurality of source pixels, respectively;
• (N+1) multiplexers coupled to the line buffers for multiplexing the pixel values to output (N+1) intermediate values, respectively, wherein N is an integer;
• N bit shifters coupled to N corresponding multiplexers out of the (N+1) multiplexers, respectively, each of the bit shifters bit-shifting a specific intermediate value outputted by a specific multiplexer to generate a shifted value;
• and
• a summation circuit coupled to a 1st multiplexer out of the (N+1) multiplexers and the bit shifters for summing the intermediate value generated by the 1st multiplexer and the shifted values generated by the bit shifters to generate a new pixel value.