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/* cc -c -Bstatic -Dsun4 -I../c convolve.c */
#include "../c/eus.h"
#pragma init (init_object_module)
pointer convolve();
static void init_object_module()
{ add_module_initializer("convolve", convolve);}
#define is2Dstring(a) (isarray(a) && \
((a)->c.ary.rank==makeint(2)) && \
isstring((a)->c.ary.entity))
pointer CONVOLVE3(ctx,n,argv)
/* (convolve3 convolution_mask divisor image result) */
context *ctx;
int n;
pointer argv[];
{
pointer convp, imgp, resultp;
char *conv;
unsigned char *img, *result, *g;
register int x,y,width,height, v, diviser;
ckarg(4);
convp= argv[0]; imgp=argv[2]; resultp= argv[3];
diviser=ckintval(argv[1]);
if (!is2Dstring(convp) || !is2Dstring(imgp) || !is2Dstring(resultp))
error(E_NOARRAY);
conv=(char *)(convp->c.ary.entity->c.str.chars);
img=imgp->c.ary.entity->c.str.chars;
result=resultp->c.ary.entity->c.str.chars;
width=intval(imgp->c.ary.dim[1]); height=intval(imgp->c.ary.dim[0]);
for (y=1; y<=height-1; y++) {
for (x=1; x<=width-1; x++) {
g= &img[width*y+x];
v= g[-width-1]*conv[0] + g[-width]* conv[1] + g[-width+1]*conv[2] +
g[-1]*conv[3] + g[0]* conv[4] + g[1]*conv[5] +
g[width-1]*conv[6] + g[width]* conv[7] + g[width+1]*conv[8];
result[width*y+x]=v/diviser;}
}
return(resultp);}
pointer LOOK_UP(ctx,n,argv)
/* foreach element indexed i, result[i]=table[src[i]] */
context *ctx;
int n;
pointer argv[];
{ pointer imgp, tablep, resultp;
register unsigned char *img, *ctable, *result;
register long size, i;
register eusinteger_t *itable;
ckarg(3);
imgp=argv[0]; resultp= argv[1]; tablep=argv[2];
if (!isstring(imgp) || !isvector(tablep) || !isstring(resultp))
error(E_NOSTRING);
if (elmtypeof(imgp)==ELM_FOREIGN)
img=(unsigned char *)imgp->c.ivec.iv[0];
else img=imgp->c.str.chars;
if (elmtypeof(resultp)==ELM_FOREIGN)
result=(unsigned char *)resultp->c.ivec.iv[0];
else result=resultp->c.str.chars;
size=vecsize(imgp);
if (elmtypeof(tablep)==ELM_INT) {
itable=tablep->c.ivec.iv;
for (i=0; i<size; i++) result[i]=itable[img[i]];}
else if (elmtypeof(tablep)==ELM_CHAR || elmtypeof(tablep)==ELM_BYTE) {
ctable=tablep->c.str.chars;
for (i=0; i<size; i++) result[i]=ctable[img[i]];}
return(resultp);}
pointer HALVE_IMAGE(ctx,n,argv)
context *ctx;
int n;
pointer argv[];
{ pointer imgp, half_imgp;
register unsigned char *img, *half_img;
register int i, j, base, half_base;
int width, height;
register int half_width, half_height;
ckarg(2);
imgp=argv[0]; half_imgp=argv[1];
if (!is2Dstring(imgp) || !is2Dstring(half_imgp)) error(E_NOARRAY);
width=intval(imgp->c.ary.dim[1]);
height=intval(imgp->c.ary.dim[0]);
half_width=width/2; half_height=height/2;
img= imgp->c.ary.entity->c.str.chars;
half_img= half_imgp->c.ary.entity->c.str.chars;
for (j=0; j<half_height; j++) {
base= width*j*2; half_base=half_width*j;
for (i=0; i<half_width; i++)
half_img[half_base+i]=
(unsigned long)(img[base+i*2]+img[base+i*2+1]+
img[base+width+i*2]+img[base+i*2+width+1])/4; }
return(half_imgp);}
pointer DOUBLE_IMAGE(ctx,n,argv)
context *ctx;
int n;
pointer argv[];
{ pointer imgp, double_imgp;
register unsigned char *img, *double_img;
register int i, j, base, double_base;
int width, height;
register int double_width, double_height;
ckarg(2);
imgp=argv[0]; double_imgp=argv[1];
if (!is2Dstring(imgp) || !is2Dstring(double_imgp)) error(E_NOARRAY);
width=intval(imgp->c.ary.dim[1]);
height=intval(imgp->c.ary.dim[0]);
double_width=width*2; double_height=height*2;
img= imgp->c.ary.entity->c.str.chars;
double_img= double_imgp->c.ary.entity->c.str.chars;
for (j=0; j<height; j++) {
base= width*j; double_base=double_width*j*2;
for (i=0; i<width; i++)
double_img[double_base+i*2]=
double_img[double_base+i*2+1]=
double_img[double_base+double_width+i*2]=
double_img[double_base+double_width+i*2+1]=
(unsigned long)(img[base+i]);
}
return(double_imgp);}
/* (median img1 grid scale imgr) */
static int median_img(img, width, height, x, y, size)
unsigned char *img;
register int width, height, x, y, size;
{ register int med, p, q, r;
register int i, j, k, v, cindex;
unsigned char seq[100], up[100], down[100];
cindex=size*size/2;
k=0;
for (j=0; j<size; j++)
for (i=0; i<size; i++)
seq[k++]= img[(j+y)*width+(x+i)];
find_med:
med=seq[0];
p=q=r=0;
for (i=0; i<k; i++)
v=seq[i];
if (v==med) r++;
else if (v>med) up[p++]=v;
else down[q++]=v;
if (q<=cindex)
if (q+r>=cindex) return(med);
else { /* find (p-cindex)th in up */
for (i=0; i<p; i++) seq[i]=up[i];
cindex=cindex-(q+r); k=p;
goto find_med; }
else {
for (i=0; i<q; i++) seq[i]=down[i];
k=q;
goto find_med; }
}
pointer MEDIAN_IMAGE(ctx,n,argv)
context *ctx;
int n;
pointer argv[];
{ pointer img1, img2;
register unsigned char *img1p, *img2p;
register int i,j;
int width, height, swidth, sheight;
int hgrid, grid_size, hscale, scale;
ckarg2(2,4);
img1=argv[0];
width=intval(img1->c.ary.dim[1]);
height=intval(img1->c.ary.dim[0]);
grid_size=ckintval(argv[1]);
scale = ckintval(argv[2]);
hgrid=grid_size/2;
hscale=scale/2;
img2=argv[3];
if (!is2Dstring(img1) || !is2Dstring(img2)) error(E_NOARRAY);
img1p=img1->c.ary.entity->c.str.chars;
img2p=img2->c.ary.entity->c.str.chars;
swidth=width/scale;
sheight=height/scale;
for (j=0; j<sheight-1; j++) {
for (i=0; i<swidth-1; i++) {
img2p[j*swidth+i]=
median_img(img1p, width, height, scale*i, scale*j, grid_size);
}}
return(img2);}
pointer convolve(ctx,n,argv)
context *ctx;
int n;
pointer argv[];
{ pointer mod=argv[0];
/* printf("convolve is being initialized. mod=%x\n",mod); */
defun(ctx,"CONVOLVE3",mod,CONVOLVE3,NULL);
defun(ctx,"LOOK-UP",mod,LOOK_UP,NULL);
defun(ctx,"HALVE-IMAGE",mod,HALVE_IMAGE,NULL);
defun(ctx,"DOUBLE-IMAGE",mod,DOUBLE_IMAGE,NULL);
defun(ctx,"MEDIAN-IMAGE",mod,MEDIAN_IMAGE,NULL);
}
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