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Flattening of 3D data

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(1)Flattening of 3D data Robert Acar, Brent W. Seales. To cite this version: Robert Acar, Brent W. Seales. Flattening of 3D data. RR-5048, INRIA. 2003. �inria-00071535�. HAL Id: inria-00071535 https://hal.inria.fr/inria-00071535 Submitted on 23 May 2006. HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés..

(2) INSTITUT NATIONAL DE RECHERCHE EN INFORMATIQUE ET EN AUTOMATIQUE. Flattening of 3D data Robert Acar — Brent W. Seales. N° 5048 Décembre 2003. ISSN 0249-6399. ISRN INRIA/RR--5048--FR+ENG. THÈME 3. apport de recherche.

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(24)  . LN?BDObD]b–B‰ŽL{TR Ob–BJBJ`SŠJB\ ”ObD]lpqDQLbSURD‰Ž‹  ?BDJ 0. + PRJB^ 0 E — TcLN? _\V–BOlD] ]b?BT~LN?BD pB‰ŠPRQDCEDJML TcqLb?BD ]bTV‰U–`LNSUTVJ²[1CPRO ;RD^(yM‹‘LN?BD ?BTR‰Š‰UT~ ^BTRLb][1ObD‰mPgLNSŽVD LNT{LN?BDSUJBSŽLNSŠPR‰\V–BD]b][:CPRO ;RD^ŸyM‹LN?BD `£8D^ŸLbObSŠPRJB\V–B‰ŠPcLbSŠTVJ2— >@?`D pTVSŠJMLTR8LN?BSU]±DY£`PRCEpB‰ŠD SŠ]CEDOlD‰Ž‹LbTkQZ?BDQ ;LN?BD7]bTV–`JB^BJBD]b]•TR8LN?BD PR‰U\VTVOlSULb?BC — œ JE‰ŠPROb\RDO D$£`PRCEpB‰UD][8CPcLb‰mPRyOb–`JB] SŠJMLNTLNOlTV–ByB‰UD> D  DObDj–BJ_PcyB‰ŠD@LbTQPRObOh‹{TV–`LeLb?BD QTVCEpB–`LNPcLNSUTVJŸTVJ™PŸ|¸tcwM} LgX¥JBT8^`D¡ + + ¤§D$£`PRCEpB‰UDR[PRJB^Ÿ D¨TV–BJ`^ŸLb?_PcLjSUL  PR] PR‰ŠOlD/PR^8‹{QTVJ`]bSU^BDObPRyB‰Ž‹E]b‰UT¸ D^(^BT~ J&TVJPEW| LVuVu¸XKJBT"^BD§]l–ByBp_PcLbQZ?&TRLN?`Dj^BPcLZP`[M^`–BD@LNT C(PgLN‰ŠPRy  ]•D$£8QD]b]lSURDkCEDCETVOh‹‘ObD´1–BSŠOlDCEDJMLb]— _–BOlLb?BDOƒLbD]hLNSUJB\TR:LN?BD§CED$LN?BT"^{ TV–`‰Š^ ObD´1–BSUObD–B]lSŠJB\(PRJBTcLN?BDO@?BSŠ\R?8XK‰UDRD‰ ]bQSŠDJ1LbS BQ.‰ŠPRJB\V–_Pc\VD]b–BQZ?WPR]  TVO _TVOhLNObPRJ²—   

(25)  . . . v3 (e8 ). e8. x. ƒSU\V–BOlD|> . ! !E± Q  

(26) .  . v7. u2 u7. u3. y. . v2. SŠ]@Lb?BDš:PcLbLbDJBSUJB\CPRp. œ J`D(TVCESU]b]lSŠTVJ›¨ObTVC LN?BDCEDLN?`T8^”^BD]lQObSUyD^²[•SU]?BT~ LNT LZP;cD&SUJMLNT™PRQQTV–BJML‘SUJ`¨TVOáX C(PgLNSUTVJ&PcyqTV–8L Q–BOlcPcLb–BObDc—•IKJB^BDD^²[`P]l–BOl;PcQDjSŠ]lTVCEDLNOlSŠQ LNTHPš:PcL7ObD\VSŠTRJ(CH–B]lL ?_P/VD DVDOl‹1 ?BDObD HDObT PR–B]b]lSmPcJ™Q–BOlcPcLb–BObDc— D8–`QZ?WSUJ`¨TVObCPcLbSŠTRJŸQPRJŸyqDDCHyqD^B^BD^,SŠJ™P Ob&D BJBDCEDJMLeTcBTV–BOpBOlT8QD^B–BOlD§PR] ¨TV‰U‰ŠT~ K] >\RSURDJ.Lb?BD ]lp_PcLNSŠPR‰1^_PcLNP`[g–B]bD ‰ŠT"Q/PR‰"PRp`pBObT/£1X SŠCPcLbSŠTVJ™LNT(Lb?BD‘Q–BOlcPcLb–BObDHSŠJ,TROb^BDOoLNT&]bD\RCDJMLŒLN?BD.]bp_PcLbSmPc‰±OlD\VSUTVJ,SUJMLNTTVJ`D.p_PROhL  ?BSŠQZ? Q/PRJ”yqDEš:PcLlLNDJ`D^²[ePcJB^ TVJ`D ?BSUQZ?’Q/PcJBJBTRL—>@?BSU]H SU‰Š‰ PRObSU]bDc[±¨TVOSUJB]lLNPRJBQDR[ SŠJ PRJM‹”]lSULb–_PcLbSŠTVJ” ?BDOlDPRJ”SŠJBSŽLNSŠPR‰U‰U‹ š:PgL.TVy"fhDQL.?_PR]HpqTVOhLNSUTVJB] ?BSUQZ?’^BDRD‰UTVpqD^²[ ÏÏ ÁZ [$ÝC\K].

(27) w. =?= . 40 35 30 25 20 110. 190 180. 100 170. 90 160. 80 150. 70. ±SŠ\V–`ObDz >7xkD‰mPR–`J_P/‹LNObSŠPRJB\R–B‰mPgLNSUTVJ TRƒ^BPcLZP 60. 140. . 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. −5. −10. −15. −20. −25. −30. −35. −40. −45 0. 21. 22. 23. ƒSU\V–BOlDHF >eIKJBSULbSmPc‰\V–BD]l]. 5. 10. 15. 20. 25. 30. 25. 24 35. 40. . ͨÎÏͨÐ.

(28)  

(29)   α = 1, no convergence 1. 0. 2. 3. 4. 5. 7. 8. 9. 10. 13. 14. 15. 18. 19. 20. −5. −10 6 −15. −20 11. 12. −25. −30 16. −35. 17. −40. −45. 21. 22. 23. 24 30. 25 40. ƒSU\V–BObDv > njD]b–B‰ŽLo ?`DJ 0 + T¸RDO LNSUCEDR[1§PROlpBSUJB\.TVO yB–`yByB‰USŠJB\`—eI¥L SU]7Lb?BDJ(TR²SUJMLNDObD]hL LbTHCET"^BSU ‹{Lb?BD pBObTRyB‰ŠDC ]bT LN?_PcL[qJ`T¸[LN?BDHš:PcLbLbDJBD^,^_PcLNP&SU]kObDpB‰ŠPRQD^“y1‹™JBDPROb‰Ž‹™š_PcLbLbDJBD^²[²PRJ`^,TVJBDH^BD"SU]bD] P™^B–_Pc‰7 P/‹”LbTW]lLbTVObD&PRJB^ "SUD LN?`D&Q–`OlVD^’p_PROhL/[•–B]lSŠJ`\B[•]NP/‹R[ePW\VObPRpB?BSUQ/PR‰ –B]lDO  ] SŠJMLNDOl;PRQDR— ioJBTRLb?BDOjpB–BOlpqTV]lD¨TROj–`]bSUJB\Q–`OlcPcLN–`ObDSŠJ`¨TRObCPcLNSUTVJŸSŠ] LNTyD.PRy`‰ŠDLNT\VDJ`DONPgLND ^_PcLZP]h‹8JMLb?BDLbSŠQPR‰Š‰Ž‹ESUJ"SUD TcqLbD]lLbSŠJ`\Lb?BSŠ]eTROeTRLN?BDOeCEDLN?`T8^B]"Lb?BD CPcLN?BDCPcLNSUQ] TR LN?BSU]pBObTRyB‰ŠDC PROlD{JBT~¦TR ^BS 2DObDJ1LbSmPc‰ŽX¥\VDTVCED$LNObSUQEJ_PcLb–BObDc—.© D{?BP~RD(]hLZPROhLND^  TVO ; LNT{LN?BSU] DJB^2— 0. 5. 10. 15. 20. 25. 35. . . H E

(30)  !(!  ±QPŸ IKJ ]lDQLbSŠTRJ z8[j D›]b?BT~ D^LN?_PcLŸ–BJ`SŠ´1–BDJBD]l]WTRHLN?BD ]bTR‰Š–`LbSŠTRJ TRLN?`D›QTVJMLNSUJ1–BTV–B] pBObTVy`‰ŠDC PRCETV–BJMLb]kLNT–BJ`SŠ´1–BDJBD]l]HTR"  [²SU]bTVCEDLbObSUQ{]bD‰U X¥C(Pcp›Tc7PpB‰mPcJBD{ObD\VSŠTRJ ‘[ –BJB^BDO•LN?BD PR]l]b–BCEp`LbSŠTRJLb?_PcL (‰UD/P/RD] p_PROhLeTR:LN?BD@yTV–BJ`^_PROl‹`£8D^W¡;SUJ{TRLN?`DO• TVOb^B][ ]b–BQZ? P( QPRJWTVJ`‰U‹ŸyDLb?BD.SU^BDJMLbSULK‹`¤$—oI¥LkSU] ;1JBT~ J,Lb?_PcLjLN?BSU]kSU]oSUJB^BDD^,Lb?BD.QPR]bDHSU TVJBD–B]lD]@LN?BDŒ;PcQL@LN?BPcL@SU]bTVCEDLbOl‹p`ObD]lDOhVD]o‰ŠT"Q/Pc‰e¡ e–BQ‰ŠSU^BDPRJ:¤§^BSU]lLZPcJBQDc— IK]@SŽLjPR‰U]bT . ÏÏ ÁZ [$ÝC\K].  #.

(31) |~u. =?= . α = 0, converges 1. 0. 2. 3. 4. 5. 7. 8. 9. 10. 13. 14. 15. 18. 19. 20. −5. −10 6 −15. −20 11. 12. −25. −30 16. −35. 17. −40. −45. 21. 22. 23. 24 30. 25 40. ƒSU\V–BObDt > njD]b–B‰ŽLo ?`DJ 0 E LN?BDQ/PR]lDHSŽeTVJ`DHOlD´1–BSUObD]oCEDObD‰U‹ Lb?_PcL“p`ObD]lDOhVD]‰UT"Q/PR‰ PROlD/PV >@?BDHPRJB]l DOjLN–BOlJB] TV–`L§LbTyDŒJBT`[_PR]§LN?`DŒ¨TV‰Š‰UT~ SŠJ`\DY£`PRCEpB‰ŠD]l?BT~ ]jSUJ Q/PR]lD ?BDOlD  SU]@LN?BD–BJ`SUL ^BSU]bQ>  D$L  N  yqD Pj¨–BJ`QLNSUTVJ‘^`&D _JBD^{TVJ  E 5 + 5  SŽLN?HLb?BD p`ObTVpDOhLK‹Lb?_PcL]bDJB^B] E PRJB^ ‹ HDObTB—ikJHD$£`PRCEpB‰UD TcB]b–`QZ?‘P SŠ]  N  B N  + : N  [ B + LbT E 5 yB–`LŒSU]±JBTcL±SU^BDJ1LbSŠQPR‰U‰UQ PRJM‹ObD/Pc‰"J1–BCHyqDO—exo&D _JBD7LN?BDJ  [cSUJ.pTV‰ŠPRO QT"TVOb^BSUJ_PcLbD][RyM‹ >   N 5   N 5 /  N C  žQPRJ D/Pc]bSU‰U‹”yqD]bDDJ LbTWpBOlD]bDOlRDLN?BD&PRObDPWCED/PR]l–BObD N

(32) N —  PR‰U]bTW‰ŠDP~RD].Lb?BD yqTV–`JB^_PROh‹“TR Lb?BD–BJBSŽLH^`SŠ]lQ `£8D^ ¡¢PRJ`^”SŽLN]QDJ1LbDO[•PR]SŽLH?BPRpBpDJB]N¤$[•PcJB^  SU]HJ`TRL LN?BDSU^BDJMLNSŽLK‹V— œ JBDQ/PRJ LN?`SŠJ ;&TR% ,Pc]oP{]l?BD/PRO@ SŽLN?™ONPR^BSŠPR‰²]h‹"CCED$LNOl‹R— >@?`SŠ]‰ŠPRQ ;WTc –`JBSŠ´1–BDJBD]l]HQPRJ“LN?BDJ“yqD{DY£"LNDJ`^BD^ LNTPcJ1‹WpqTR‰U‹"\VTVJBPR‰ƒOlD\VSUTVJ > y1‹Lb?BDHnjSUDCPRJBJWC(PcpBpBSUJB\(Lb?BDTVOlDC ¡¨]bDDc[qDc—Ç\`—Š[ $Ç't & ¤Y[ SŠ]jQTVJ8¨TVObCPR‰U‰U‹ D´1–BSUcPR‰UDJML LNT Lb?BD,–BJBSŽL^BSU]bQc— I¥ X SU]P QTRJ`¨TVObCPR‰oCPRp ¨ObTVC  LNT [§Lb?BDJ X  X  5 Lb?BD QTVJcfh–`\MPcLND.TR [²SU]P]bD‰U X¥C(Pcp“TR  ?BSUQZ?”SU]JBTRLkLN?BD‘SU^BDJ1LbSULK‹R[ ?BSŠQZ?›‰UD/P/VD]Lb?BD yqTV–`JB^_PROh‹TR `£8D^²[PRJB^Ÿ ?BSUQZ?WpBOlD]bDOlRD]PROlD/P`[_]lSŠJ`QDSULb] VPRQTVyBSŠPRJ²[_pBOlT8^`–BQLjTR LN?BD VPRQTVyBSŠPRJ TRƒDPRQZ? ;PRQLbTVO[BSU] TVJBDc— ³oTRLbDLb?_PcL ?BDObD DHPcObDJBTRL DY£`p`‰ŠSUQSŽLN‰Ž‹ –B]bSUJB\ LN?BD.;PcQLkLb?_PcL X SU]ŒQTVJ8¨TVObCPR‰;[2TVJ`‰U‹ŸLN?_PgLŒSŽLSŠ]ŒP&^BS 2DTVCETVObpB?`SŠ]lCŸ— ƒSU\V–BOlD] L&PRJB^ }Ÿ?BD‰Šp "SU]b–_Pc‰ŠS HD&Lb?BSU]H]lD‰Ž XKCPRp²— IKJ”Lb?BD]l(D _\V–`ObD][ƒLN?`D(QTVJ`¨TVOlC(Pc‰7CPRp”¨ObTVC Lb?BD 0. 5. 10. 15. 20. 25. 35. . . . ͨÎÏͨÐ.

(33) |V|.  

(34)  . –BJBSŽLe^BSU]bQ§LNToLN?BD§]l´1–_PRObD§ PR]eQTVCEpB–`LND^E–B]bSUJB\>TVyM‹{xkOlSŠ]lQTV‰U‰  ] 8D QZ?M PRO=HYX  ?BOlSŠ]hLNT qD‰ WPcLN‰ŠPRyLNT"TV‰UyqT/£”¡¨]bDD $ v & ¤$— . −1. −0.8. −0.6. −0.4. −0.2. 0. 0.2. 0.4. 0.6. 0.8. 1 −1. −0.8. ƒSŠ\R–BObDQL > jJBSULj]l´"–BPRObD. −0.6. . −0.4. −0.2. 0. 0.2. 0.4. 0.6. 0.8. 1. . 

(35)  # §

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(37) H. >@?BD ]bTV‰U–`LNSUTVJTRoLb?BDš:PcLlLNDJ`SŠJB\›pBOlTVyB‰UDC5SU]QPR]lL(PR]_J`^BSŠJ`\›Lb?BD CSUJBSUC.–BC TRkP QDOhLZPRSUJ,QObSŽLNDOlSŠTRJ [S;—ÇDc—Š[2PR]ŒP(cPROlSmPgLNSUTVJ_PR‰ pBOlTVyB‰UDC —k>@?BSU]Œ^BSU]bQObD$LNS H/PcLbSŠTVJ“‹"SUD‰U^B]P ¨–BJBQLbSŠTRJŸTc _J`SULbD‰Ž‹ C(PcJ1‹&RPcObSŠPRyB‰UD]H¡;J_PcCD‰U‹R[BLN?BDpTV]bSŽLNSUTVJB] TRLN?`+D @K¨ObD D BŒJBT8^`D]Z¤Y S¢— DR—U[8Lb?BDk]hLZPcLbDŒ]bp_PcQDŒSU"] _J`SULbD$XK^`SŠCEDJ`]bSUTVJ_PR‰;— œ ²Lb?BSU] cPRObSŠPcLNSUTVJ_Pc‰p`ObTVyB‰UDC [` DŒJBDD^ LNTPRJB]h DOjLb?BD¨TV‰Š‰UT~ SŠJ`\(´1–BD]lLNSUTVJBK] > X xoT8D] Lb?BD]bTV‰U–`LbSŠTVJŸD$£8SU]lL V X7IK]@Lb?BD]bTV‰U–`LNSUTVJŸ–BJBSU´1–BWD V X FjT~ ]bDJB]bSŽLNSŽVDHSŠ]@Lb?BD]bTV‰U–`LNSUTVJ LNTpqDOlLb–BOby_PgLNSUTVJB] SŠJLb?BD^_PcLZGP V A X D8SUJBQDHLN?`DHcPRObSŠPcLbSŠTVJBPR‰pBObTRyB‰ŠDC SŠ]oSŠJ`?BDOlDJMLN‰Ž‹,PE^BSU]bQObDLbIS HPcLNSUTVJ²[ DH^BTVJ  LoD$£1X pqDQLSŽLŒLNTyD‘LN?`D‘]NPRCEDEPR]oLN?BD{]lTV‰Š–8LNSUTVJ“TR LN?BD‘š_PcLbLbDJBSUJB\pBOlTVyB‰UDC —  –`L^BT"D]SŽL PRpBpBOlT~£8SUCPcLNDSŽCL VWIKJ  ?BSŠQZ?™]bDJB]bD V ÏÏ ÁZ [$ÝC\K].

(38) |¸z. =?= . −1. −0.8. −0.6. −0.4. −0.2. 0. 0.2. 0.4. 0.6. 0.8. 1 −1. ƒSU\V–BOlD} > ikObDPgXKp`ObD]lDOh8SUJB\(pqDOlLN–`Oby_PcLbSŠTRJ ©”D{Q/PcJ PRJB]l DOLb?BD _Ol]lL´1–BD]hLNSUTVJ›y1‹™LN?BD‘PUObCPcLNSŽVD>kLN?`D{\VObT~@LN?“p`ObTVpDOhLK‹ TR SUJ,LN?BD{‰ŠPROl\VD‘\V–_PcONPRJMLNDD]ŒLb?_PcLŒLb?BDOlD‘D$£8SU]lLyqTR–BJB^BD^ ¡¨?BDJ`QD{QTRCpBPRQLZ¤k‰ŠT~ DO ‰ŠD$VD‰:]lDLN][8]lTLb?_PcL P\V‰ŠTRy_PR‰BCESUJBSŠCH–BC D$£8SU]lLN]—e>@?BDoPRJB]l DO LNTLN?`Dj]lDQTVJB^&´1–BD]lLbSŠTVJ  TV–`‰Š^™yqD‹VD][SU  DObDH]lLNOlSŠQ$LN‰Ž‹ QTVJMRD$£q2yB–8#L SU]jJBTRLjDRDJWQTVJMVDY£ž¡¨]bDDyD‰UT¸o¤Y— FoT~ D$VDO[@TV–BOEDY£`pDOlSŠCEDJ1Lb]]bDDC5LNT›SUJB^BSUQ/PcLbDŸLb?_Pc L ¦SU](]hLNObSUQLb‰U‹ QTVJMVD$£SUJ Lb?BD JBDSU\V?1yqTR–BOb?BT"T"^ TR LN?BD(CSUJBSUCP`[± ?BSUQZ?  TV–B‰U^ SŠCEpB‰Ž‹ LN?_PgLHCESUJBSUC(PWPRObDSŠ]lTV‰ŠPcLND^²[ ?BDJBQD ‰ŠT"Q/PR‰U‰Ž‹’–BJBSU´1–BDR—’©”DŸ^`T›J`TRLE?_P/VD‹VD$LP“pBOlT8TcoTcoLb?BD–BJBSU´1–BDJBD]b]TcjLb?BD \V‰ŠTRy_PR‰•CESUJBSŠCH–BC —&³jTRLND{Lb?_PcL]bSUJBQDELN?`D^BPcLZPSU][ SŠJ”P ]bDJ`]bDR[±PRpBp`ObT/£8SŠCPcLbDR[]bSUJBQD LN?BD7^BSU]lLZPcJBQD]•PRJB^.PRObDPR]±PRObSU]bD ¨ObTVC PopBSUDQD SU]bD š:PgLƒPcpBpBObT/£8SUC(PgLNSUTVJ‘TR8LN?BD7]b–BOh;PRQDc[  D^BTJBTRL DY£`pDQ$LoLb?BDcPR‰Š–`DHPgL@LN?BDQTRCp`–`LND^WCESŠJ`SŠCH–BC LNTEyDDY£`PRQLb‰U"‹ HDObT`— ©”D]lDDyM‹ J`T¸ Lb?_PcL/[ƒ‰mPRQ ;1SUJB\“QTRJ1RD$£8SŽLK‹V[§P™pBObT"QD^B–BObD(LNT,]lTV‰URDJ1–BCEDObSUQ/Pc‰Š‰Ž‹ LN?BD cPROlSmPgLNSUTVJ_PR‰8pBObTVy`‰ŠDC  SU‰Š‰BJ`DD^{LbTŒ?_P/VD ObDPR]bTRJ_PRyB‰Ž‹‘OlTVyB–B]hL \V‰ŠTRy_PR‰"QTVJMVDOb\VDJBQD pBObTVpDOhLNSUD]—>@?BD{PRJB]h DOb]ŒLbT&LN?BDHLN?BSUOb^ PRJ`^,¨TV–BOlLb?,´1–BD]hLNSUTVJ›PRObDHyqTcLN?,OlD‰ŠPcLND^,LNT LN?BD,^`D\VOlDD“TRQTRJ1RD$£8SŽLK‹˜TR SUJ LN?BD,J`DSU\V?1yqTV–`Ob?BT"T8^ TcLb?BD,\V‰UTVy_Pc‰kCESŠJ`SŠCH–BC ¡¨ ?BSUQZ?WSU]jPR‰Š]lTP‰UT8QPR‰²CESUJBSŠCH–BC(¤jPcJB^WP/ PRSŽLj¨–`OlLN?`DOjPRJ_PR‰Ž‹"]bSU]— −0.8. −0.6. −0.4. −0.2. 0. 0.2. 0.4. 0.6. 0.8. 1. . ͨÎÏͨÐ.

(39) |~F.  

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(51) Unité de recherche INRIA Sophia Antipolis 2004, route des Lucioles - BP 93 - 06902 Sophia Antipolis Cedex (France) Unité de recherche INRIA Futurs : Parc Club Orsay Université - ZAC des Vignes 4, rue Jacques Monod - 91893 ORSAY Cedex (France) Unité de recherche INRIA Lorraine : LORIA, Technopôle de Nancy-Brabois - Campus scientifique 615, rue du Jardin Botanique - BP 101 - 54602 Villers-lès-Nancy Cedex (France) Unité de recherche INRIA Rennes : IRISA, Campus universitaire de Beaulieu - 35042 Rennes Cedex (France) Unité de recherche INRIA Rhône-Alpes : 655, avenue de l’Europe - 38334 Montbonnot Saint-Ismier (France) Unité de recherche INRIA Rocquencourt : Domaine de Voluceau - Rocquencourt - BP 105 - 78153 Le Chesnay Cedex (France). Éditeur INRIA - Domaine de Voluceau - Rocquencourt, BP 105 - 78153 Le Chesnay Cedex (France).   

(52).   . ISSN 0249-6399.

(53)

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