Fast Blind Restoration of QR Code Images Based on Blurred Imaging Mechanism

QR code symbols	$E d g e B$	$d$	$O_{x}$	$O_{y}$	$S$	$D$	$R$
Original size	81	31	146	147	87	77	10
9/10 times	86	28	146	145	92	82	10
8/10 times	92	23	142	148	98	88	10
7/10 times	98	21	145	141	105	95	10
Upper left	44	23	94	119	50	40	10
Upper right	154	23	204	120	160	150	10
Lower left	49	23	99	183	55	45	10
Lower right	159	23	209	182	165	155	10

Table 2. Analysis of restoration effect

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Table 2. Analysis of restoration effect

Figures	Image quality	Blurred	YAN Y et al ^［23］	BAI Y C et al ^［13］	WEN F et al ^［15］	Ours
Fig. 5（1）	PSNR	60.956 7	61.493 8	61.684 8	61.073 8	61.663 9
Fig. 5（1）	SSIM	0.995 3	0.996 8	0.997 3	0.996 6	0.998 3
Fig. 5（2）	PSNR	60.895 1	66.765 0	64.787 6	62.461 1	64.892 0
Fig. 5（2）	SSIM	0.994 6	0.999 5	0.999 3	0.998 3	0.999 3
Fig. 5（3）	PSNR	60.892 9	61.404 2	61.215 3	61.740 6	62.647 7
Fig. 5（3）	SSIM	0.995 3	0.996 5	0.996 6	0.996 8	0.998 6

Table 3. Analysis of operation time and recognizability

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Table 3. Analysis of operation time and recognizability

Algorithms	Recognition rate			Average operation time T/s
Algorithms	Zxing （v3.4.0）	Wochacha （v10.0.1）	Wechat （v8.0.5）	Average operation time T/s
YAN Y et. al ^［23］	24.62%	72.31%	79%	14.879 6
BAI Y C et. al ^［13］	20.00%	89.23%	90.77%	9.035 5
WEN F et. al ^［15］	6.92%	44.62%	51.51%	9.633 1
Ours	70.77%	86.92%	93.08%	0.329 2

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Rongjun CHEN, Zhijun ZHENG, Huimin ZHAO, Jinchang REN, Hongzhou TAN. Fast Blind Restoration of QR Code Images Based on Blurred Imaging Mechanism[J]. Acta Photonica Sinica, 2021, 50(7): 91

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