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brightnessThreshold = 0.9
maxSignatureLen = 10
function rgb(i)
local r = bit32.band(bit32.rshift(i, 16), 255)
local g = bit32.band(bit32.rshift(i, 8), 255)
local b = bit32.band(i, 255)
return r, g, b
end
function bright(r, g, b)
return (r+g+b)/(255*3)
end
-- from Java class "SegmentCounter"
function countSegments(y, flip)
local lastPix = 1
local segments = 0
for x = 0, (flip and h or w)-1 do
local pix = bright(rgb(flip and img.getInt(y, x) or img.getInt(x, y)))
if pix >= brightnessThreshold and lastPix < brightnessThreshold then
segments = segments+1
end
lastPix = pix
end
if lastPix < brightnessThreshold then segments = segments+1 end
return segments
end
function getSegmentSignature(flip)
local s = ""
local lastN = 0
for y = 0, (flip and w or h)-1 do
local n = math.min(countSegments(y, flip), 9)
if n ~= lastN then
if #s >= maxSignatureLen then return nil end
s = s..n
end
lastN = n
end
if lastN == 0 and #s > 0 then
s = s:sub(1, #s-1)
end
return s
end