C++*********************************************************************
C
C $$ BLOB_Q.FOR
C
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2005  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program is free software; you can redistribute it and/or      *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* This program is distributed in the hope that it will be useful,    *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
C=* General Public License for more details.                           *
C=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C
C IMAGE_PROCESSING_ROUTINE
C
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C--*********************************************************************
C
C $$ BLOB_Q.FOR
C

        SUBROUTINE  BLOB_Q(X,LSD,NSAM,NROW,NR)

         DIMENSION   X(LSD,NROW)
         PI=4.0*DATAN(1.0D0)
         RR=NR*NR
         NO=NROW/2+1
         NS=NSAM/2+1
c$omp parallel do private(j,i,r,r2)
         DO J=1,NROW
            R=(J-NO)*(J-NO)
            DO I=1,LSD
               R2=R+(I-NS)*(I-NS)
               IF(R2.GT.RR)  THEN
                  X(I,J)=0.0
               ELSE
                  X(I,J)=(COS(SQRT(R2/RR)*PI)+1.0)*0.5
               ENDIF
            ENDDO
         ENDDO
         END