Evaluation of Interpolation Effects on Upsampling and Accuracy of Cost Functions-Based Optimized Automatic Image Registration

Table 3

3D PSNR for MR images of 64–512 for interpolations of trilinear, nearest neighbor, B-spline 3rd order, B-spline 4th order, cubic Lagrangian, quintic Lagrangian, heptic Lagrangian, and windowed Sinc.

	PSNR (dB)
	Matrix size
Interpolation	64 × 64	128 × 128	256 × 256	512 × 512
Trilinear	91.95	100.61	111.01	121.76
Nearest neighbor	86.78	95.76	104.47	114.29
B-spline 3rd order	87.62	96.57	106.17	114.73
B-spline 4th order	89.44	96.92	106.60	115.93
Cubic Lagrangian	91.73	98.63	108.14	121.29
Quintic Lagrangian	91.74	100.42	108.16	121.45
Heptic Lagrangian	91.75	100.44	108.19	121.61
Windowed Sinc	91.72	98.49	108.11	121.28