Home » U++ Library support » U++ Library : Other (not classified elsewhere) » tif image 16 bit. autolevel
Re: tif image 16 bit. autolevel [message #32236 is a reply to message #32233] |
Mon, 02 May 2011 16:21 |
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I thing this is what I look for:
http://en.wikipedia.org/wiki/Histogram_equalisation
I did a variant of autolevel, but I intend to modify by wikipedia specification.
Image ImageAutolevel(const Image& img){
uint64 histogram[256];
for(int i=0;i<256;++i)
histogram[i]=0;
const RGBA *start = img;
const RGBA *s = start;
const RGBA *e = s + img.GetLength();
while(s < e){
histogram[(s->r+s->g+s->b)/3]++;
s++;
}
int v_lower = -1;
int v_upper = -1;
for(int i=0;i<256&&(v_lower==-1||v_upper==-1);++i){
if(v_lower==-1&&histogram[i]!=0)
v_lower = i;
if(v_upper==-1&&histogram[255-i]!=0)
v_upper = 255-i;
}
// return if not sense to autolevel
//if(v_lower==v_upper==-1)
if(v_lower==-1)
v_lower = 0;
if(v_upper==-1)
v_upper = 255;
s = start;
ImageBuffer w(img.GetSize());
Unmultiply(w);
RGBA *t = w;
while(s < e) {
t->r = s->r*255/v_upper;
t->g = s->g*255/v_upper;
t->b = s->b*255/v_upper;
t->a = s->a;
t++;
s++;
}
Premultiply(w);
w.SetHotSpots(img);
return w;
}
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tif image 16 bit. autolevel
By: tojocky on Fri, 29 April 2011 08:54
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Re: tif image 16 bit. autolevel
By: koldo on Fri, 29 April 2011 10:12
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Re: tif image 16 bit. autolevel
By: tojocky on Fri, 29 April 2011 11:28
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Re: tif image 16 bit. autolevel
By: tojocky on Fri, 29 April 2011 11:52
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Re: tif image 16 bit. autolevel
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Re: tif image 16 bit. autolevel
By: tojocky on Fri, 29 April 2011 11:35
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Re: tif image 16 bit. autolevel
By: mirek on Fri, 29 April 2011 20:13
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Re: tif image 16 bit. autolevel
By: koldo on Sat, 30 April 2011 09:33
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Re: tif image 16 bit. autolevel
By: tojocky on Sat, 30 April 2011 18:07
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Re: tif image 16 bit. autolevel
By: tojocky on Sat, 30 April 2011 18:21
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Re: tif image 16 bit. autolevel
By: koldo on Sun, 01 May 2011 15:50
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Re: tif image 16 bit. autolevel
By: tojocky on Mon, 02 May 2011 09:30
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Re: tif image 16 bit. autolevel
By: koldo on Mon, 02 May 2011 10:17
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Re: tif image 16 bit. autolevel
By: tojocky on Mon, 02 May 2011 10:30
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Re: tif image 16 bit. autolevel
By: tojocky on Mon, 02 May 2011 12:03
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Re: tif image 16 bit. autolevel
By: koldo on Mon, 02 May 2011 14:02
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Re: tif image 16 bit. autolevel
By: tojocky on Mon, 02 May 2011 16:21
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Re: tif image 16 bit. autolevel
By: koldo on Mon, 02 May 2011 17:37
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Re: tif image 16 bit. autolevel
By: tojocky on Thu, 05 May 2011 20:10
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Re: tif image 16 bit. autolevel
By: tojocky on Thu, 05 May 2011 20:15
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Re: tif image 16 bit. autolevel
By: koldo on Thu, 05 May 2011 21:28
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Re: tif image 16 bit. autolevel
By: tojocky on Fri, 06 May 2011 13:25
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