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Registered Member #2140
Joined: Tue May 26 2009, 09:16PM
Location:
Posts: 53
Ok, so i have been thinking about this for awhile and i have absolutely no idea how to implement it. The way i am seeing it, i would have to have huge multi-dimensional arrays in order to store the differences of smaller matches, which can be added for bigger patches. Any hints?
EDIT: More questions Until now, to find the difference of the blocks, i have been doing
diff = 0;
for (int i = 0; i < x; i++) {
for (int d = 0; d < y; d++) {
int bdiff = Math.abs(block.getBlue(i, d) - block2.getBlue(i, d));
int rdiff = Math.abs(block.getRed(i, d) - block2.getRed(i, d));
int gdiff = Math.abs(block.getGreen(i, d) - block2.getGreen(i, d));
diff += (rdiff + gdiff + bdiff);
}
}
where block and block2 are the blocks being compared, and x and y are the width and height of the blocks.
I just tried this:
diff = 0;
for (int i = 0; i < x; i++) {
for (int d = 0; d < y; d++) {
int s1 = block.getBlue(i, d) + block.getRed(i, d) + block.getGreen(i, d);
int s2 = block2.getBlue(i, d) + block2.getRed(i, d) + block2.getGreen(i, d);
diff += Math.abs(s2-s1);
}
}
and although the results are different, they are very close. Which one should i use? One compares the R,G, and B values individually, and the second compares them as a whole.
If the second one is fine, than caching the sums becomes much much easier.
EDIT: Is one comparing brightness and the other colors?
EDIT EDIT: I did some more expirimenting with gray scale images, and they are almost exactly the same results (very minor insignificant differences). I need to make sure with different pictures, but i am fairly sure i can stay with gray scale. On a 34 minute scan i previously did with a color image, it took 24 minutes with gray scale. This is the color result: and the grey-scale looks the same at first glance. Both same filters.
This should make it significantly easier to store previous sums, further increasing speed.
Registered Member #2140
Joined: Tue May 26 2009, 09:16PM
Location:
Posts: 53
Do you think it will be fine to compare the whole sums of each patch rather than each pixel? This would negate the effect of the pixel's position, and compares it as a whole. This would be easier to cache the sums
EDIT: Nevermind. Did some testing, doesn't work well
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