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* Cambridge University Press, 1992, Section 8.5, ISBN 0-521-43108-5
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void f_medfilt2(float*,float*,int*,int*);
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void d_medfilt2(double*,double*,int*,int*);
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void b_medfilt2(unsigned char*,unsigned char*,int*,int*);
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void f_medfilt2(float*,float*,intp*,intp*);
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void d_medfilt2(double*,double*,intp*,intp*);
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void b_medfilt2(unsigned char*,unsigned char*,intp*,intp*);
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extern char *check_malloc (int);
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#define ELEM_SWAP(a,b) { register float t=(a);(a)=(b);(b)=t; }