A Systematic Hardware Sharing Method for Unified Architecture Design of H.264 Transforms

Table 1

The input and output bit-widths for each transform of H.264.

	4 × 4 forward transform		4 × 4 inverse transform		8 × 8 forward transform		8 × 8 inverse transform
	In	Out	In	Out	In	Out	In	Out
Row transform	9	12	16	16	9	12, 13	16	16
Column transform	12	15	16	16	13	16	16	16
	4 × 4 forward Hadamard		4 × 4 inverse Hadamard		2 × 2 forward Hadamard		2 × 2 inverse Hadamard
	In	Out	In	Out	In	Out	In	Out
Row transform	16	16	16	16	16	16	16	16
Column transform	16	16	16	16	16	16	16	16