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hist hacking

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This commit is contained in:
John Cupitt 2010-03-24 16:07:54 +00:00
parent 7d170f4ab9
commit 63742489e2
2 changed files with 39 additions and 60 deletions
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20
libvips/histograms_lut/im_histplot.c
View File

@ -1,22 +1,4 @@
/* @(#) im_histplot: plot a 1xany or anyx1 image file as a max x any or
* @(#) any x max graph using these rules:
* @(#)
* @(#) - unsigned char
* @(#) always output 256
* @(#) - other unsigned integer types
* @(#) output 0 - max
* @(#) - signed int types
* @(#) min moved to 0, max moved to max + min.
* @(#) - float types
* @(#) min moved to 0, max moved to any (square output)
* @(#)
* @(#) usage:
* @(#)
* @(#) int
* @(#) im_histplot( hist, histplot )
* @(#) IMAGE *hist, *histplot;
* @(#)
* @(#) Returns non-zero on error
/* draw a histogram
*
* Copyright: 1990, N. Dessipris.
*

79
libvips/histograms_lut/im_histspec.c
View File

@ -1,22 +1,17 @@
/* @(#) Creates a lut for transforming imagein (with histin) according to
* @(#) the pdf of imageref (with histref). The lut should have been set
* @(#) by a call to im_setbuf() or im_openout(). histin and histref
* @(#) should have been set by a call to im_mmapin() or they are buffer images
* @(#)
* @(#) Usage: int im_histspec(in, ref, out)
* @(#) IMAGE *histin, *histref, *out;
* @(#)
* @(#) Returns 0 on success and -1 on error
* @(#)
/* match PDFs
*
* Copyright: 1991, N. Dessipris.
*
* Author: Nicos Dessipris
* Written on: 19/07/1990
* Modified on: 26/03/1991
*
* 1/3/01 JC
* - bleurg! rewritten, now does 16 bits as well, bugs removed, faster,
* smaller
* - bleurg! rewritten, now does 16 bits as well, bugs removed, faster,
* smaller
* 24/3/10
* - gtkdoc
* - small cleanups
*/
/*
@ -86,22 +81,16 @@ match( IMAGE *in, IMAGE *ref, IMAGE *out )
int i, j;
if( im_iocheck( in, out ) || im_iocheck( ref, out ) )
return( -1 );
if( in->Coding != IM_CODING_NONE || ref->Coding != IM_CODING_NONE ) {
im_error( "im_histspec", "%s", _( "not uncoded" ) );
if( im_iocheck( in, out ) ||
im_iocheck( ref, out ) ||
im_check_uncoded( "im_histspec", in ) ||
im_check_format( "im_histspec", in, IM_BANDFMT_UINT ) ||
im_check_coding_same( "im_histspec", in, ref ) ||
im_check_format_same( "im_histspec", in, ref ) ||
im_check_bands_same( "im_histspec", in, ref ) ||
im_check_hist( "im_histspec", in ) ||
im_check_hist( "im_histspec", ref ) )
return( -1 );
}
if( in->BandFmt != IM_BANDFMT_UINT ||
ref->BandFmt != IM_BANDFMT_UINT ) {
im_error( "im_histspec", "%s", _( "bad band format" ) );
return( -1 );
}
if( in->Bands != ref->Bands ) {
im_error( "im_histspec", "%s",
_( "input histograms differ in number of bands" ) );
return( -1 );
}
/* How big?
*/
@ -109,13 +98,9 @@ match( IMAGE *in, IMAGE *ref, IMAGE *out )
px = 256;
else if( inpx <= 65536 && refpx <= 65536 )
px = 65536;
else {
im_error( "im_histspec", "%s", _( "luts too large" ) );
return( -1 );
}
max = px * bands;
/* Unpack to equal sized buffers.
/* Unpack to equal-sized buffers.
*/
inbuf = IM_ARRAY( out, max, unsigned int );
refbuf = IM_ARRAY( out, max, unsigned int );
@ -165,13 +150,29 @@ match( IMAGE *in, IMAGE *ref, IMAGE *out )
out->Xsize = px;
out->Ysize = 1;
out->Type = IM_TYPE_HISTOGRAM;
if( im_setupout( out ) )
return( -1 );
if( im_setupout( out ) || im_writeline( 0, out, (PEL *) outbuf ) )
if( im_writeline( 0, out, (PEL *) outbuf ) )
return( -1 );
return( 0 );
}
/**
* im_histspec:
* @in: input image
* @ref: reference histogram
* @out: output image
*
* Creates a lut which, when applied to the image from which histogram @in was
* formed, will produce an image whose PDF matches that of the image from
* which @ref was formed.
*
* See also: im_histgr(), im_maplut().
*
* Returns: 0 on success, -1 on error
*/
int
im_histspec( IMAGE *in, IMAGE *ref, IMAGE *out )
{
@ -179,18 +180,14 @@ im_histspec( IMAGE *in, IMAGE *ref, IMAGE *out )
int px;
int fmt;
if( im_open_local_array( out, t, 5, "im_histspec", "p" ) )
if( im_check_uint( "im_histspec", in ) ||
im_check_uint( "im_histspec", ref ) )
return( -1 );
if( !vips_bandfmt_isuint( in->BandFmt ) ||
!vips_bandfmt_isuint( ref->BandFmt ) ) {
im_error( "im_histspec", "%s",
_( "input luts are not some unsigned integer type" ) );
return( -1 );
}
/* Match hists.
*/
if( im_histeq( in, t[0] ) ||
if( im_open_local_array( out, t, 5, "im_histspec", "p" ) ||
im_histeq( in, t[0] ) ||
im_clip2fmt( t[0], t[1], IM_BANDFMT_UINT ) ||
im_histeq( ref, t[2] ) ||
im_clip2fmt( t[2], t[3], IM_BANDFMT_UINT ) ||