Method
VipsImagehist_find_indexed
Declaration [src]
int
vips_hist_find_indexed (
VipsImage* in,
VipsImage* index,
VipsImage** out,
...
)
Description [src]
Optional arguments:
combine:VipsCombine, combine bins like this
Make a histogram of in, but use image index to pick the bins. In other
words, element zero in out contains the combination of all the pixels in in
whose corresponding pixel in index is zero.
char and uchar index images are cast to uchar before histogramming, all
other image types are cast to ushort. index must have just one band.
in must be non-complex.
out always has the same size and format as in.
Normally, bins are summed, but you can use combine to set other combine modes.
This operation is useful in conjunction with vips_labelregions(). You can use it to find the centre of gravity of blobs in an image, for example.
See also: vips_hist_find(), vips_labelregions().
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