[1] [1] MINER R M. Methods and apparatus for testing roundness and straightness of pipes and tubes, United States Patent: 4354379［P］. 1982.

[2] [2] DO H H, MYUNG S C, DEOK H L, et al.. A case study on detection and sizing of defects in steam generator tubes using eddy current testing ［J］.Nuclear Engineering and Design, 2010, 240(1): 204-208.

[3] [3] RAIS A, SOURAV B, TRIBIKRAM K. Cylindrical guided waves for damage in underground pipes using wavelet transforms ［J］. SPIE, 2006, 6174: 767-776.

[4] [4] MORITZ R, CHRISTAN W F. Rotating optical geometry sensor for inner pipe-surface reconstruction ［J］. SPIE, 2010, 7538.

[5] [5] SUN W Y, LI T J, HUANG M, et al.. Crack inspection of pipeline based on image processing ［J］. Manufacturing Automation, 2012, 34(1): 36-39. (in Chinese)

[6] [6] WU J, SMITH J S, LUCAS J. Weld bead placement system for multipass welding ［J］. Science, Measurement & Technology, 1996, 143(2): 85-90.

[7] [7] ZHEN J, XU CH G, JING P ZH, et al.. A study on a detection system based on ring laser used for inner wall of deep hole ［J］.Opto-Electronic Engineering, 2004, 31(1): 32-35. (in Chinese)

[8] [8] XIE ZH D. A special method of real time image processing for circular image transformation ［J］. Computing Techniques for Geophysical and Geochemical Exploration, 2001, 23(3): 286-288. (in Chinese)

[9] [9] TU D W, TAO J. The equipment for optoelectronic spy system for quantitative testing ［J］. Opt. Precision Eng., 1999, 7(5): 129-134. (in Chinese)

[10] [10] ZHU J, LI X F, TAN W B, et al.. Measurement of short arc based on centre constraint least-square circle fitting ［J］. Opt. Precision Eng., 2009, 17(10): 2486-2492. (in Chinese)

[11] [11] ZHANG Z H, LI K J, WU X B, et al.. Research and implementation of the algorithm for unwrapped and distortion correction basing on CORDIC for panoramic image ［J］. SPIE, 2008, 6623: 66231C-66231C-9.

[12] [12] MA Z L, WANG J ZH. Unwrapping and distortion correction of catadioptric panoramic reconnaissance image ［J］. Journal of Projectiles, Rockets, Missiles and Guidance, 2010, 30(5): 173-176. (in Chinese)

[13] [13] LIU H Y, ZHU CH J, LI J. Several calculation methods of time complexity ［J］. Computer Knowledge and Technology, 2011, 7(19): 4636-4638. (in Chinese)

[14] [14] WANG H J, WANG J L, WANG M H, et al.. Efficient image inpainting based on bilinear interpolation downscaling ［J］. Opt. Precision Eng., 2010, 18(5): 1234-1241. (in Chinese)

[15] [15] HAN J Q, HU H ZH, ZHANF X M, et al.. Machine Vision Technology and Applications ［M］. Beijing: Higher Education Press, 2009. (in Chinese)