A QR Code Secret Hiding Scheme against Contrast Analysis Attack for the Internet of Things

Table 2

Error correction characteristics of Versions 1, 20, and 40.

Version	Total number of codewords	Error correction level	Number of error correction codewords	Number of error correction blocks	Error correction code per block (,,)
1	26	L	7	1	(26,19,2)
		M	10	1	(26,16,4)
		Q	13	1	(26,13,6)
		H	17	1	(26,9,8)
20	1085	L	224	3	(135,107,14)
				5	(136,108,14)
		M	416	3	(67,41,13)
				13	(68,42,13)
		Q	600	15	(54,24,15)
				5	(55,25,15)
		H	700	15	(43,15,14)
				10	(44,16,14)
40	3706	L	750	19	(148,118,15)
				6	(149,119,15)
		M	1372	18	(75,47,14)
				31	(76,48,14)
		Q	2040	34	(54,24,15)
				34	(55,25,15)
		H	2430	20	(45,15,15)
				61	(46,16,15)