TABLE 1

Mean Squared Errors for Different Combinations of Prediction Region and Block Size When Degree of Overlap Is 50%

	Prediction region
	Low count level			Intermediate count level			High count level
Block size	3 × 3*	3 × 3	5 × 5	3 × 3*	3 × 3	5 × 5	3 × 3*	3 × 3	5 × 5
4 × 4	2.09	1.73	—	8.83	3.17	—	19.12	6.29	—
5 × 5	1.31	1.23	—	3.93	3.11	—	13.32	10.50	—
6 × 6	1.30	1.19	8.41	3.95	3.29	19.17	13.72	11.70	110.07
7 × 7	1.26	1.04	1.28	3.93	3.06	3.65	13.60	10.76	14.12
8 × 8	1.28	1.07	1.17	3.97	3.21	3.53	13.99	11.31	11.92
9 × 9	1.28	1.06	1.06	3.95	3.12	3.16	14.00	11.17	11.25
10 × 10	1.25	1.09	1.15	3.95	3.32	3.38	14.01	11.78	11.81
11 × 11	1.25	1.06	1.06	3.94	3.28	3.22	14.05	11.80	11.56
12 × 12	1.26	1.09	1.08	3.98	3.46	3.48	14.17	12.30	12.51

3 × 3* = prediction region of 4 orthogonal neighbors of predicted pixel; — = modeling not possible because prediction region ≥ block size.
Block sizes and other prediction regions are squares in pixels.