get("#356") -- num2hex get("#348") -- rgb functions function hashImage(img) local hash = 0 local w, h = img.width, img.height for y = 0, h-1 do for x = 0, w-1 do local pix = img.getInt(x, y) local r, g, b = rgb(pix) local p = r+g*33+b*71 local scale = bit32.band(y*w+x, 0xFFFF)+1 --hash = (hash * a + pix) % 0x100000000 --a = (a * b) % 0x100000000 local arg = (p+1)*scale hash = bit32.bxor(hash, arg) --[[if x < 10 then print("scale", scale, "pix", pix, "p", p, "arg", arg, "hash", hash) end]] end --print("y", y, "hash", hash) end return num2hex(hash, 8) end
Probably fairly crappy (might cause hash collisions), but I guess it can be used for now
test run test run with input download show line numbers
Travelled to 12 computer(s): aoiabmzegqzx, bhatertpkbcr, cbybwowwnfue, gwrvuhgaqvyk, ishqpsrjomds, lpdgvwnxivlt, mqqgnosmbjvj, pyentgdyhuwx, pzhvpgtvlbxg, tslmcundralx, tvejysmllsmz, vouqrxazstgt
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Snippet ID: | #380 |
Snippet name: | hashImage (include) |
Eternal ID of this version: | #380/1 |
Text MD5: | 0137480d9879d478d1cbaea509066e51 |
Author: | stefan |
Category: | hash functions |
Type: | Lua code |
Public (visible to everyone): | Yes |
Archived (hidden from active list): | No |
Created/modified: | 2015-02-17 20:35:12 |
Source code size: | 681 bytes / 26 lines |
Pitched / IR pitched: | No / Yes |
Views / Downloads: | 877 / 266 |
Referenced in: | [show references] |