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24 LINES
Lua code
1 get("#356 ") -- num2hex
2 get("#348 ") -- rgb functions
3
4 function roughHashImage(img)
5 local hash = 0
6 local w, h = img.width, img.height
7
8 for y = 0, h-1 do
9 for x = 0, w-1 do
10 local pix = img.getInt(x, y)
11 local b = math.floor(bright(rgb(pix))*25+0.5)
12 local p = b
13 local scale = bit32.band(y*w+x, 0xFFFF)+1
14 local arg = ((p+1)*scale*7) % 1234567
15 hash = bit32.bxor(hash, arg)
16 --[[if x < 10 then
17 print("scale", scale, "pix", pix, "p", p, "arg", arg, "hash", hash)
18 end]]
19 end
20 --print("y", y, "hash", hash)
21 end
22
23 return num2hex(hash, 8)
24 end
Author comment
Began life as a copy of #380 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
ID
Author/Program
Comment
Date
965 #1000604 (pitcher)2015-08-20 15:28:24 964 #1000610 (pitcher)2015-08-18 00:07:07
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Snippet ID:
#415
Snippet name:
Rough-Hash Function
Eternal ID of this version:
#415/1
Text MD5:
7e158c2267faa430c6f33a04342096ef
Author:
stefan
Category:
hash functions
Type:
Lua code
Public (visible to everyone):
Yes
Archived (hidden from active list):
No
Created/modified:
2015-02-06 13:46:44
Source code size:
629 bytes / 24 lines
Pitched / IR pitched:
No / Yes
Views / Downloads:
1577 / 270
Referenced in:
[show references]