Journal of Beijing University of Aeronautics and A stronautics PCNN, PCNN. Nove l adap tive deno ising m e thod fo r extrem e no ise ba sed on PCNN
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1 Journal of Beijing University of Aeronautics and A stronautics January 2009 Vol. 35 No11 PCNN (, ) : PCNN ( Pulse Coup led Neural Network) ADEN (Adapative Denosing method for Extreme Noise) 2PCNN., ;, PCNN PCNN,,.. : ; ; ( PCNN) ; : TP : A : (2009) Nove l adap tive deno ising m e thod fo r extrem e no ise ba sed on PCNN L iu Yuanm in Q in Shiyin ( School of Automation Science and Electrical Engineering, Beijing University of Aeronautics and A stronautics, Beijing , China) Ab strac t: To imp lement the removal of salt and pepper noise effectively and the conservation of image details and textures, a novel adap tive denoising method for extrem e noise based2on pulse coup led neural net2 work (ADEN2PCNN) was p roposed. A kind of detection mechanism was app lied to discrim inate whether a giv2 en p ixel was corrup ted or not, and only the corrup ted p ixels must be denoised so that the original image infor2 mation could not be damaged and the details as well as the textures of the images clould be conserved effective2 ly. To imp rove the image quality, the self2organization m echanism was introduced into PCNN array framework, thus the neighboring connection modes of neurons in the PCNN could sw itch automatically. Furthermore, an a2 dap tive mechanism was used to automatically select the op timal filtering times based on the estimated noise in2 tensity to enhance adap tability of algortihm. Experiment results indicate that this m ethod p resented is more p reponderant than the conventional m ethods and other congeneric methods in removing noise and conserving image details. Ke y wo rd s: image denoising; noise detection; pulse coup led neural network ( PCNN) ; adap tive filtering,,.,,,,,. PCNN ( Pulse Coup led Neural Network) [ 1-2 ], 3, [ 3 ], [ 4 ] [ 5 ] [ 6 ] [ 7 ] [ 8-9 ]. [ 8 ] PCNN,, : : ( ),,,, liu_yuan_m in@163. com.
2 1 : PCNN 3 3,,. [ 9 ],,,,,. [ 8-9 ],,,,,,. 1 PCNN PCNN 3 :,,, 1. 4 : ij ( k) F ij ( k) = e - F t F ij ( k - 1) + S ij + U ij ( k) Y ij ( k) V F M ijk l Y k l ( k - 1) (1) = F ij ( k) (1 + L ij ( k) ) (2) = e - t ij ( k - 1) + V Y ij ( k - 1) (3) = step (U ij ( k) - ij ( k) ) = 1 U ij > ij 0 (4), ij ( i, j) ; F ij ; S ij ; M ijk l ( k, l) ( i, j) ; L ij, ; U ij ; ij ( dynam ic threshold) ; Y ij ; k k ; ; t. V F, V ; F,., ij (0) = uv ( 0),, x ij, x uv ( ij ( 0) > x ij > x uv )., k = 0, ( 3 ),, ij ( k) = ij (0) exp ( - k t) < x ij, ( i, j) 1,. ( u, v) L uv ( k + 1) 0, ( k + 1 ) ( u, v) U uv = x uv (1 + L uv ( k + 1) ). x uv U uv, U uv = x uv ( 1 + L uv ( k + 1) ) > uv, ( u, v). ( u, v) ( i, j),.,., [ 10 ],., PCNN,,. 2 PCNN 2. 1 PCNN PCNN,,,, :. 2 N ij 3 3, F,, W, (5), L ij (6). 7 7, 2. W pq = ( p, q) V pq ( p, q) (5) 1 PCNN PCNN,,.,. ( i, j), ( u, v) 2 3 3
3 i+1 j+1 L ij = p = i- 1 q = j- 1 W pq Y pq - W ij Y ij (6), V pq ( p, q) ; Y pq ( p, q), Y pq = 1, 0.,.,,.,,, ;, ;, [ 8 ]..,,,., PCNN. 8, 0 255,, , ( i, j) 7 7 W 7 7, ( i, j) 0 255, 0 255,,,,, ,.,,, PCNN. PCNN : 0. 5, 3 3 ; ( 7), 6, : l = 1 0 < < < < < > PCNN (7), ADEN (Adapative Denosing method for Extreme Noise) 2PCNN, PCNN,,,. ADEN2PCNN. 1, m + 6, n + 6, m, n. 2 sum = 0; ( i, j), x ( i, j) = 255 0, x ( p, q) (0, 255), ( p, q) W 7 7, x ( i, j), sum + + ; = sum / (m n) ; ( 7) l, PCNN. 3 PCNN = , N = 5, = 0. 01, V = 0, t = 1,M ijk l = 0, PCNN,. 4 for t = 1 to 2 If t = 1 then = 255 If t = 2 then = 1 for p = 1 ton 1) (2) (5) U ij. 2) (3). 3) (4),. 4) :,,. 5) :. End for End for t.
4 1 : PCNN 111 5, 4,. 3, , 0. 4, 0. 5, 0. 6, 0. 7, PSNR ( Peak Signal to Noise Ratio) 9. 12, 8. 19, 7. 40, 6. 7 db, 4. 3 ADEN2PCNN a ,,,., PCNN, 0. 6, PCNN ,. 4,,,. 1, PSNR,.,. [ 9 ] : PCNN,, PCNN,. PSNR /db 1 PSNR /db ADEN2PCNN b 0. 5 c 0. 6 d PCNN ADEN2PC2 NN,,. PCNN,,,,., PCNN,,. ( References) [ 1 ] Eckhorn R, Reitboeck H J, A rndt M, et al. Feature linking via synchronization among distributed assemblies: simulation of re2
5 sults from cat cortex [ J ]. Neural Computation, 1990, 2 ( 3 ) : [ 2 ] John J L, R itter D. Observation of periodic waves in a pulse - coup led neural network [ J ]. Op t Lett, 1993, 18 ( 15) : [ 3 ] Johnson J L, PadgettM L. PCNN models and app lications [ J ]. IEEE Trans on Neural Networks, 1999, 10 (3) : [ 4 ] L iu X, W ang D L. Range image segmentation using a relaxation oscillator networks [ J ]. IEEE Trans on Neural Networks, 1999, 10 (3) : [ 5 ] B roussard R P, Rogers S K, OxleyM E, et al. Physiologically motivated image fusion for object detection using a pulse coup led neural network [ J ]. IEEE Trans on Neural Networks, 1999, 10 (3) : [ 6 ],,. PCNN [ J ]., 2008, 35 (1) : Yu Ruixing, Zhu B ing, Zhang Ke. New image fusion algorithm based on PCNN [ J ]. Op to2electronic Engineering, 2008, 35 (1) : ( in Chinese) [ 7 ] Kinser J M. Foveation by a pulse2coupled neural network [ J ]. IEEE Trans on Neural Networks, 1999, 10 (3) : [ 8 ],,. PCNN [ J ]., 2002, 24 (10) : Gu Xiaodong, Guo Shide, Yu Daoheng. A new approach for noise reducing of image based on PCNN [ J ]. Journal of Elec2 tronics & Information Technology, 2002, 24 (10) : ( in Chinese) [ 9 ],,,. [ J ]. E, 2004, 34 (8) : Zhang Junying, Lu Zhijun, Shi L in, et al. Filtering images con2 tam inated with salt and pepper noise with pulse2coupled neural networks [ J ]. Science in China E, 2004, 34 (8) : ( in Chinese) [ 10 ],. [M ]. :, 2003: Yang Xingjun, Zheng Junli. A rtificial neural network and blind signal processing [ M ]. Beijing: Tsinghua University Press, 2003: ( in Chinese) ( : ) ( 64 ) TIG, 1 s [ 6 ]. 1Cr18N i9ti, 2,,,,. 4 1) IGBT TIG, DSP, ; 2) TIG 30 khz, di/dt 50A / s; 3) TIG,,. ( References) [ 1 ]. [M ]. :, 1988: Jiang Huanzhong. Electric arc welding & electroslag welding [M ]. Beijing: China Machine Press, 1988: ( in Chi2 nese) [ 2 ],. [ J ]., 1981 (4) : Zhao Jiarui, Si Shuheng. The research and manufacture of a new transistor welding power source[ J ]. Journal of Tianjin Universi2 ty, 1981 (4) : ( in Chinese) [ 3 ] Jin Onuki, Yoshisa Anazawa, Masayasu N ihei, et al. Develop2 ment of a new high2frequency, high2peak current power source for high constricted arc formation [ J ]. Jpn J App l Phys, 2002 (41) : [ 4 ],. TIG [ J ]., 1989 (3) : Zhao Jiarui, L i Yidan. Control over arc of pulsed high frequency tig welding and high frequency effect [ J ]. Journal of Tianjin U2 niversity, 1989 (3) : ( in Chinese) [ 5 ],,. :, [ P ] Q i Bojin, Xu Haiying, Huang Songtao. U ltra2sonic pulse TIG welding power source: Chinese, [ P ] ( in Chinese) [ 6 ]. [ J ]., 1982, 13 (4) : Ya W encui. A study of high frequency pulsed current helium gas tungsten arc welding of high2strength alum inum alloy[ J ]. Trans2 actions of the ChinaW elding Institution, 1982, 13 (4) : ( in Chinese) ( : )
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