EURASIP Journal on Image and Video Processing

Table 5 Confusion matrices of various JPEG compression.

From: Screenshot identification by analysis of directional inequality of interlaced video

		out				out				out
	NS	SS	UN		NS	SS	UN		NS	SS	UN
in				in				in
NS	97.80	0.50	1.70	NS	97.53	0.70	1.77	NS	97.33	0.77	1.90
CS	0.07	98.43	1.50	CS	0.07	98.53	1.40	CS	0.27	97.50	2.23
	JPEG quality: 100				JPEG quality: 90				JPEG quality: 80
		out				out				out
	NS	SS	UN		NS	SS	UN		NS	SS	UN
in				in				in
NS	97.73	0.60	1.67	NS	97.90	0.87	1.23	NS	98.13	0.97	0.90
CS	0.03	98.77	1.20	CS	0.13	98.93	0.93	CS	0.17	98.83	1.00
	JPEG quality: 70				JPEG quality: 60				JPEG quality: 50
		out				out				out
	NS	SS	UN		NS	SS	UN		NS	SS	UN
in				in				in
NS	98.90	0.77	0.33	NS	99.17	0.50	0.33	NS	99.37	0.10	0.53
CS	1.30	95.43	3.10	CS	1.17	95.73	3.10	CS	2.43	93.93	3.63
	JPEG quality: 40				JPEG quality: 30				JPEG quality: 20

(UN: Undetermined, unit: %, Dark gray cell: identification accuracy is larger than 95%, Light gray cell: identification accuracy is smaller than or equal to 95%)

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