An Efficient FPGA Implementation of Optimized Anisotropic Diffusion Filtering of Images

Table 5

Runtime comparison in software and hardware for bilateral filtering (BF) and anisotropic diffusion (AD) filtering (note that A = 150 × 150, B = 256 × 256, C = 512 × 512, and D = 1024 × 1024). The processing platform was done on an Intel(R) Core(TM) 2 Duo CPU T6600 3.2 GHz system.

Filtering techniques	AD filtering				BF
Image resolution	A	B	C	D	A	B	C	D
Execution time (software in seconds)	0.101	0.153	0.402	1.1	0.5	1.1	2.5	11.5
Acceleration rate in software for anisotropic over bilateral (approx.)	3x	3x	3x	3x	—	—	—	—
Acceleration rate when executed in hardware with respect to software for BF	—	—	—	—	70x	6x	7x	3x
Acceleration rate when executed in hardware with respect to software for AD	91x	46x	30x	21x	—	—	—	—