Application of Image Enhancement in X-Ray Photography of Cultural Relics

Jiankai Xiang; Meng Wu; Zhan Wang; Gang Zhen; Linyan Ma

doi:10.3788/LOP56.063402

Laser & Optoelectronics Progress, Volume. 56, Issue 6, 063402(2019)

Application of Image Enhancement in X-Ray Photography of Cultural Relics

Jiankai Xiang^1,2、*, Meng Wu³, Zhan Wang^1,2, Gang Zhen^1,2, and Linyan Ma^1,2

¹ Key Scientific Research Base on the Conservation of Stone and Brick Materials, State Administration of Cultural Heritage of China, Xi'an, Shaanxi 710075, China

² Shaanxi Provincial Institute of Cultural Relics Protection, Xi'an, Shaanxi 710075, China

³ School of Information and Control Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055, China

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Figures & Tables(7)

Fig. 1. X-ray image enhancement process of bronze mirror. (a) Original image; (b) result of high-frequency emphasis filtering (D0=200); (c) result of adaptive performing histogram on (b) (D0=200); (d) result of image enhancement (D0=500)

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Fig. 2. X-ray images of ceramic shard before and after image enhancement. (a) Original image; (b) enhanced image

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Fig. 3. X-ray images of clay sculpture (shoulder) before and after image enhancement. (a) Original image; (b) enhanced image

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Fig. 4. Enhancement results of bronze mirror by different algorithms. (a) Histogram equalization; (b) Laplace filter

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Table 1. GMG values of X-ray images before and after enhancement
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Table 1. GMG values of X-ray images before and after enhancement
X-ray image Bronzemirror Ceramicshard Claysculpture
Original image 0.1577 0.1223 0.0788
Enhanced image 0.6619 1.5854 0.8560

Table 2. IE values of X-ray images before and after image enhancement
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Table 2. IE values of X-ray images before and after image enhancement
X-ray image Bronzemirror Ceramicshard Claysculpture
Original image 10.7022 6.2308 6.9654
Enhanced image 11.9847 10.6347 12.9535

Table 3. Comparison of image enhancement effects by three enhancement algorithms
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Table 3. Comparison of image enhancement effects by three enhancement algorithms
Parameter Originalimage Histogramequalization Laplacefilter Proposedalgorithm
GMG 0.1577 0.2133 0.5734 0.6619
IE /(bit·pixel^-1) 10.7022 4.8537 11.4496 11.9847

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Jiankai Xiang, Meng Wu, Zhan Wang, Gang Zhen, Linyan Ma. Application of Image Enhancement in X-Ray Photography of Cultural Relics[J]. Laser & Optoelectronics Progress, 2019, 56(6): 063402

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