Image Processing Library Performance Specifications

The representative performance specifications that follow are results averaged over many repetitions of each function call. Data is in cache. Results were measured using a 200 MHz Pentium^® processor-based PC, a 200 MHz Pentium processor with MMX™ technology-based PC, a 200 MHz Pentium Pro processor-based PC, and a 233 MHz Pentium II processor-based PC. The tests were run under Windows* 95 and Windows NT. All execution times are expressed in clocks/pixel/plane.

Selected Functions	Execution Times§ for Pentium® Processor	Execution Times§ for Pentium® Processor with MMX™ Technology	Execution Times§ for Pentium® Pro Processor	Execution Times§ for Pentium® II Processor
Add	15.5	4.23	12.9	2.26
Alpha Pre-Multiply	21.5	2.82	5.31	1.94
Alpha Composite	227	10.8	36.8	12.4
Convolve, 2D (5x5 kernel)	375	83.75	104	64.25
Blur	88.0	89.5	101.5	96
2D FFT, Real, 256x256	158	157	136	129
2D FFT, Real, 64x64	131	109	110	86.9
2D DCT, 64x64	265	99.9	215	85.7
Equalize Histogram	12	11.3	3.32	3.57
Color Twist	116	47.2	64.2	58
Rotate, 100 degr., nearest neighbor	72.7	27.1	23.3	14
Rotate, 100 degr., linear interpolation	191	60.2	114	60.5
Zoom by 5/3, nearest neighbor	9.76	9.67	4.48	4.21
Zoom by 5/3, linear interpolation	51.4	27.5	35.6	22.2
Decimate by 3/5, nearest neighbor	12	11	7.42	7.06
Decimate by 3/5, linear interpolation	109	107	29.1	27.6