1 | --[[ |
2 | -- returns a value between 0 and 1 |
3 | function iconDiff_arrays(i1, i2) |
4 | local w, h = #i1[1], #i1 |
5 | if w ~= #i2[1] or h ~= #i2 then |
6 | error("iconDiff: Icon size mismatch")
|
7 | end |
8 | |
9 | local count, sum = w*h, 0 |
10 | for y = 1, h do |
11 | local l1, l2 = i1[y], i2[y] |
12 | for x = 1, w do |
13 | local diff = math.abs(string.byte(l1, x)-string.byte(l2, x)) |
14 | sum = sum+diff |
15 | end |
16 | end |
17 | |
18 | return sum/count |
19 | end |
20 | ]] |
21 | |
22 | function iconDiff(i1, i2) |
23 | local l = #i1 |
24 | if l ~= #i2 then |
25 | error("iconDiff: Icon size mismatch ("..#i1.."/"..#i2..")")
|
26 | end |
27 | |
28 | local count, sum = 0, 0 |
29 | for i = 1, l do |
30 | local c1, c2 = string.byte(i1, i), string.byte(i2, i) |
31 | if (c1 == 46) ~= (c2 == 46) then |
32 | error("iconDiff: Icon size mismatch")
|
33 | end |
34 | if c1 ~= 46 then |
35 | sum, count = sum+math.abs(c1-c2), count+1 |
36 | end |
37 | end |
38 | |
39 | return sum/25/count |
40 | end |
41 | |
42 | -- limit = the maximum diff we are interested in |
43 | -- (nil is returned when diff is equal or greater than the limit) |
44 | -- w = width and height of the icons |
45 | function iconDiffWithLimit_verbose(i1, i2, limit, w, h, verbose) |
46 | assert(type(limit) == 'number') |
47 | assert(type(w) == 'number') |
48 | assert(type(h) == 'number') |
49 | |
50 | if limit == 0 then return nil end |
51 | local l = #i1 |
52 | if l ~= #i2 then |
53 | error("iconDiff: Icon size mismatch")
|
54 | end |
55 | |
56 | local count, sum = w*h, 0 |
57 | limit = limit*count*25 |
58 | for i = 1, l do |
59 | local c1, c2 = string.sub(i1, i, i), string.sub(i2, i, i) |
60 | if verbose then |
61 | print("c1", c1, "c2", c2, "sum", sum)
|
62 | end |
63 | if (c1 == '.') ~= (c2 == '.') then |
64 | error("iconDiff: Icon size mismatch")
|
65 | end |
66 | if c1 ~= '.' then |
67 | local diff = math.abs(string.byte(c1)-string.byte(c2)) |
68 | sum = sum+diff |
69 | if sum >= limit then return nil end |
70 | end |
71 | end |
72 | |
73 | return sum/25/count |
74 | end |
75 | |
76 | -- limit = the maximum diff we are interested in |
77 | -- (nil is returned when diff is equal or greater than the limit) |
78 | -- w = width and height of the icons |
79 | function iconDiffWithLimit(i1, i2, limit, w, h) |
80 | assert(type(limit) == 'number') |
81 | assert(type(w) == 'number') |
82 | assert(type(h) == 'number') |
83 | |
84 | if limit == 0 then return nil end |
85 | local l = #i1 |
86 | if l ~= #i2 then |
87 | error("iconDiff: Icon size mismatch")
|
88 | end |
89 | |
90 | local count, sum = w*h, 0 |
91 | limit = limit*count*25 |
92 | for i = 1, l do |
93 | local c1, c2 = string.byte(i1, i), string.byte(i2, i) |
94 | if (c1 == 46) ~= (c2 == 46) then -- 46 is '.' |
95 | error("iconDiff: Icon size mismatch")
|
96 | end |
97 | if c1 ~= 46 then |
98 | sum = sum+math.abs(c1-c2) |
99 | if sum >= limit then return nil end |
100 | end |
101 | end |
102 | |
103 | return sum/25/count |
104 | end |
test run test run with input download show line numbers
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| Snippet ID: | #433 |
| Snippet name: | iconDiff |
| Eternal ID of this version: | #433/1 |
| Text MD5: | 4ef7f1b4e5ce02d7e844fc8db8842acf |
| Author: | stefan |
| Category: | image recognition |
| Type: | Lua code |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2015-02-09 15:28:34 |
| Source code size: | 2665 bytes / 104 lines |
| Pitched / IR pitched: | No / Yes |
| Views / Downloads: | 772 / 245 |
| Referenced in: | [show references] |