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hist hacking

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This commit is contained in:
John Cupitt 2010-03-24 14:20:42 +00:00
parent c692c70b92
commit 29b9747e42
1 changed files with 23 additions and 22 deletions
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45
libvips/histograms_lut/im_histnD.c
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@ -1,18 +1,11 @@
/* @(#) im_histnD: make a one, two or three dimensional histogram of a 1, 2 or
* @(#) 3 band image. Divide each axis into a certain number of bins .. ie.
* @(#) output is 1 x bins, binx x bins, or bins x bins x bins bands.
* @(#) uchar and ushort only.
* @(#)
* @(#) Usage:
* @(#) int im_histnD( image, hist, bins )
* @(#) IMAGE *image, *hist;
* @(#) int bins;
* @(#)
* @(#) Returns 0 on success and -1 on error
/* n-dimensional histogram
*
* Written on: 8/7/03
* 10/11/04
* - oops, was not checking the bandfmt coming in
* 24/3/10
* - gtkdoc
* - small celanups
*/
/*
@ -201,6 +194,21 @@ find_hist( REGION *reg, void *seq, void *a, void *b )
return( 0 );
}
/**
* im_histgr:
* @in: input image
* @out: output image
* @bins: number of bins to make on each axis
*
* Make a one, two or three dimensional histogram of a 1, 2 or
* 3 band image. Divide each axis into a certain number of bins .. ie.
* output is 1 x bins, bins x bins, or bins x bins x bins bands.
* uchar and ushort only.
*
* See also: im_histgr(), im_histindexed().
*
* Returns: 0 on success, -1 on error
*/
int
im_histnD( IMAGE *in, IMAGE *out, int bins )
{
@ -211,18 +219,11 @@ im_histnD( IMAGE *in, IMAGE *out, int bins )
/* Check images. PIO from in, WIO to out.
*/
if( im_pincheck( in ) || im_outcheck( out ) )
if( im_check_uncoded( "im_histnD", in ) ||
im_check_u8or16( "im_histnD", in ) ||
im_pincheck( in ) ||
im_outcheck( out ) )
return( -1 );
if( in->Coding != IM_CODING_NONE ) {
im_error( "im_histnD", "%s", _( " uncoded images only" ) );
return( -1 );
}
if( in->BandFmt != IM_BANDFMT_UCHAR &&
in->BandFmt != IM_BANDFMT_USHORT ) {
im_error( "im_histnD",
"%s", _( " unsigned 8 or 16 bit images only" ) );
return( -1 );
}
max_val = in->BandFmt == IM_BANDFMT_UCHAR ? 256 : 65536;
if( bins < 1 || bins > max_val ) {