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Optimised Y based deltas.

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git-svn-id: http://svn.zoneminder.com/svn/zm/trunk@499 e3e1d417-86f3-4887-817a-d78f3d33393f
This commit is contained in:
stan
2003-04-16 22:03:08 +00:00
parent 3f68c09b45
commit 9ceca1d524
1 changed files with 9 additions and 16 deletions
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25
src/zm_image.cpp
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@@ -448,18 +448,15 @@ Image *Image::Delta( const Image &image ) const
}
else
{
static int red, green, blue;
static int y_src, y_ref;
static unsigned char red, green, blue;
while( psrc < (buffer+size) )
{
if ( ZM_FAST_RGB_DIFFS )
{
red = ABSDIFF(*psrc, *pref);
psrc++; pref++;
green = ABSDIFF(*psrc, *pref);
psrc++; pref++;
blue = ABSDIFF(*psrc, *pref);
psrc++; pref++;
red = abs(*psrc++ - *pref++);
green = abs(*psrc++ - *pref++);
blue = abs(*psrc++ - *pref++);
// This is uses an RMS function, all floating point and
// rather too slow
//*pdiff++ = (JSAMPLE)sqrt((red*red + green*green + blue*blue)/3);
@@ -469,18 +466,14 @@ Image *Image::Delta( const Image &image ) const
}
else
{
//static int ysrc = ((299*psrc[0])/1000) + ((567*psrc[1])/1000) + ((114*psrc[2])/1000);
//static int yref = ((299*pref[0])/1000) + ((567*pref[1])/1000) + ((114*pref[2])/1000);
y_src = ((19595*psrc[0])>>16) + ((37159*psrc[1])>>16) + ((7471*psrc[2])>>16);
y_ref = ((19595*pref[0])>>16) + ((37159*pref[1])>>16) + ((7471*pref[2])>>16);
red = *psrc++ - *pref++;
green = *psrc++ - *pref++;
blue = *psrc++ - *pref++;
// This is an experimental one which uses the Y part of an RGB
// to YUV conversion. Should still be integer but a bit slower
//*pdiff++ = (JSAMPLE)( abs(ysrc-yref) );
*pdiff++ = (JSAMPLE)ABSDIFF( y_src, y_ref );
psrc += 3;
pref += 3;
*pdiff++ = abs(((19595*red)>>16) + ((37159*green)>>16) + ((7471*blue)>>16));
}
}
}