We added IsImageSimilar() to ImageMagick 6.2.8-4 Beta if anyone wants to
take a look at the solution to locating coordinates of a sub-image within
another image. It works in all colorspaces and accounts for image masks.
Below a test program for IsImageSimilar(). Compile with:
cc `Magick-config --cflags --cppflags` -o similar similar.c \
`Magick-config --ldflags --libs`
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <magick/MagickCore.h>
int main(int argc,char **argv)
{
ExceptionInfo
*exception;
Image
*crop_image,
*image;
ImageInfo
*image_info;
long
x,
y;
RectangleInfo
region;
if (argc != 2)
{
(void) fprintf(stdout,"Usage: %s image\n",argv[0]);
exit(0);
}
InitializeMagick(*argv);
exception=AcquireExceptionInfo();
image_info=CloneImageInfo((ImageInfo *) NULL);
(void) strcpy(image_info->filename,argv[1]);
image=ReadImage(image_info,exception);
if (exception->severity != UndefinedException)
CatchException(exception);
if (image == (Image *) NULL)
exit(1);
region.width=100;
region.height=100;
region.x=100;
region.y=100;
crop_image=CropImage(image,®ion,exception);
x=0;
y=0;
IsImageSimilar(image,crop_image,&x,&y,exception);
printf("%ld %ld\n",x,y);
image=DestroyImageList(image);
image_info=DestroyImageInfo(image_info);
exception=DestroyExceptionInfo(exception);
DestroyMagick();
return(0);
}
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