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Added Desaturation filter and relative functions. 

An ENUM for Desaturation methods has been added too.
Added EQ filter and relative functions. It works just on lighness right now. Comments still to be written. work in progress.
This commit is contained in:
Paolo Cignoni 2008-07-17 10:07:19 +00:00
parent 5082a0cb03
commit ed2a6ce2f8
1 changed files with 93 additions and 2 deletions
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95
vcg/complex/trimesh/update/color.h
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@ -64,7 +64,8 @@ Changed name from plural to singular (normals->normal)
#define __VCG_TRI_UPDATE_COLOR
#include <limits>
#include <math.h>
#include <vcg/space/color4.h>
#include <vcg/space/color4.h>
#include <vcg/math/histogram.h>
namespace vcg {
namespace tri {
@ -574,13 +575,103 @@ static int Colourisation(UpdateMeshType &m, Color4b c, float intensity, const bo
static Color4b ColorApplyDiff(Color4b old_color, Color4b new_color, float intensity)
{
return Color4b( ValueApplyDiff(old_color[0],new_color[0],intensity), ValueApplyDiff(old_color[1],new_color[1],intensity), ValueApplyDiff(old_color[2], new_color[2],intensity), 1);
return Color4b( ValueApplyDiff(old_color[0],new_color[0],intensity), ValueApplyDiff(old_color[1],new_color[1],intensity), ValueApplyDiff(old_color[2], new_color[2],intensity), 255);
}
static int ValueApplyDiff(int old_value, int new_value, float intensity)
{
return math::Clamp<int>((int)(old_value + intensity * (new_value - old_value)), 0, 255);
}
static int Desaturation(UpdateMeshType &m, int method, const bool ProcessSelected=false)
{
int counter=0;
VertexIterator vi;
for(vi=m.vert.begin();vi!=m.vert.end();++vi) //scan all the vertex...
{
if(!(*vi).IsD()) //if it has not been deleted...
{
if(!ProcessSelected || (*vi).IsS()) //if this vertex has been selected, do transormation
{
(*vi).C() = ColorDesaturate((*vi).C(), method);
++counter;
}
}
}
return counter;
}
enum DesaturationMethods {M_LIGHTNESS = 0, M_MEAN = 1};
static Color4b ColorDesaturate(Color4b c, int method)
{
switch(method){
case M_LIGHTNESS:{
int val = (int)ComputeLightness(c);
return Color4b( val, val, val, 255);
}
case M_MEAN:{
int val = (int)ComputeMeanLightness(c);
return Color4b( val, val, val, 255);
}
default: assert(0);
}
}
static float ComputeMeanLightness(Color4b c)
{
return float(c[0]+c[1]+c[2])/3.0f;
}
static int Equalize(UpdateMeshType &m, const bool ProcessSelected=false)
{
int counter=0;
VertexIterator vi;
//FILE *fp;
//fp=fopen("added.txt","a+");
Histogramf H;
H.Clear();
H.SetRange(0, 255, 255);
for(vi=m.vert.begin();vi!=m.vert.end();++vi) //scan all the vertex...
{
if(!(*vi).IsD()) //if it has not been deleted...
{
if(!ProcessSelected || (*vi).IsS()) //if this vertex has been selected, do transormation
{
int v = (int)(ComputeLightness((*vi).C())+0.5);
H.Add(v);
}
}
}
int cdf[256];
cdf[0] = H.BinCount(0);
for(int i=1; i<256; i++){
cdf[i] = H.BinCount(float(i)) + cdf[i-1];
}
for(vi=m.vert.begin();vi!=m.vert.end();++vi) //scan all the vertex...
{
if(!(*vi).IsD()) //if it has not been deleted...
{
if(!ProcessSelected || (*vi).IsS()) //if this vertex has been selected, do transormation
{
(*vi).C()=ColorEqualize((*vi).C(), cdf[(int)(ComputeLightness((*vi).C())+0.5)], cdf[0], cdf[255]);
++counter;
}
}
}
return counter;
}
static Color4b ColorEqualize(Color4b c, int cdfValue, int cdfMin, int cdfMax)
{
//int v = (int)ComputeLightness(c);
float v = float((cdfValue - cdfMin)/float(cdfMax - cdfMin)) * 255.0f;
return Color4b( (int)v, (int)v, (int)v, 255);
}
};