中国激光, 2018, 45 (1): 0104004, 网络出版: 2018-01-24
激光超声可视化图像处理研究 
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Research on Laser Ultrasonic Visual Image Processing
图 & 表
图 1. 激光超声可视化无损检测系统。(a)原理图;(b)实物图
Fig. 1. Laser ultrasonic visualization nondestructive testing system. (a) Principle diagram; (b) physical map
图 2. 具有模拟缺陷和扫描面积的焊接试验样品。(a)实物图;(b)尺寸
Fig. 2. Welding test sample with simulated defect and scanning area. (a) Physical map; (b) size
图 3. 基于声场互易原理的激光超声可视化
Fig. 3. Laser ultrasonic visualization based on the reciprocity theorem of acoustic wave fields
图 4. 局部统计滤波前后第57帧超声传播图像的比较。(a)含噪声图像;(b)降噪后图像
Fig. 4. Comparison of ultrasonic wave propagation image of 57th frame before and after local statistic filtering. (a) Noisy image; (b) denoised image
图 5. 局部统计滤波前后不同帧间(a)熵和(b)平均梯度的比较
Fig. 5. Comparison of (a) entropy and (b) average gradient under different frames before and after local statistic filtering
图 6. 利用微分算子去噪后的图像增强。(a)第346帧降噪图像;(b)图像增强后的第346帧降噪图像
Fig. 6. Denoised image enhancement by differential operator. (a) Denoised image of 346th frame; (b) denoised image of 346th frame after image enhancement
图 7. (a)第246帧降噪图像;利用二阶微分算子(b) Od1、(c) Od2、(d) Od3进行图像增强后的第246帧降噪图像
Fig. 7. (a) Denoised image of 246th frame; denoised images of 246th frame after image enhancement with two order differential operators of (b) Od1, (c) Od2 and (d) Od3
图 8. (a)第346帧降噪图像;利用二阶微分算子(b) Od1、(c) Od2、(d) Od3进行图像增强后的第346帧降噪图像
Fig. 8. (a) Denoised image of 346th frame; denoised images of 346th frame after image enhancement with the two order differential operators of (b) Od1, (c) Od2 and (d) Od3
图 9. 入射波(a)抑制前和(b)抑制后的第346帧降噪图像
Fig. 9. Denoised images of 346th frame (a) before and (b) after incident wave suppression
图 10. (a)权重因子ω、正则化系数λ与平均梯度的等值线;(b)权重因子ω、正则化系数λ与熵的等值线;(c)权重因子ω、正则化系数λ与峰值信噪比的等值线;(d)权重因子ω、正则化系数λ与结构相似性的等值线
Fig. 10. (a) Contour lines of weighting factor ω, regularization coefficient λ and average gradient; (b) contour lines of weighting factor ω, regularization coefficient λ and entropy; (c) contour lines of weighting factor ω, regularization coefficient λ and PSNR; (d) contour lines of weighting factor ω, regularization coefficient λ and SSIM
图 11. (a)罚函数法和(b)相邻波相减法对第346帧图像进行入射波抑制的结果;(c)罚函数法和(d)相邻波相减法对第376帧图像进行入射波抑制的结果
Fig. 11. Effect of (a) penalty function and (b) adjacent wave subtraction on incident wave suppression on 346th frame images; effect of (c) penalty function and (d) adjacent wave subtraction on incident wave suppression on 376th frame images
朱洪玲, 刘畅, 张博, 蔡桂喜. 激光超声可视化图像处理研究[J]. 中国激光, 2018, 45(1): 0104004. Zhu Hongling, Liu Chang, Zhang Bo, Cai Guixi. Research on Laser Ultrasonic Visual Image Processing[J]. Chinese Journal of Lasers, 2018, 45(1): 0104004.
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