get("#137") -- split

get("#349") -- table functions

get("#350") -- RecogUtil 2

function make_sig2letter()

  -- first, signatures from alphabet (#1000080), then additional

  -- signatures for slightly varying instances, e.g. from #1000082

  sigs = "121-1212 1321-12121 121-12121 121-121 1321-1 12-1 12321-12121 1-212 1-1 121-121 121-212 1-1 1-2343 1-232 121-121 121-121 12321-12121 12321-1212 12321-12121 1-1 1-21 12121-56787865 1-21 12321-1 12121-212 132321-12121"

  letters = {"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "VWX", "Y", "Z",

    "X", "B"}

  sigs = split(sigs, " ")

  sig2letter = {}

  for i=1, #sigs do

    sig = sigs[i]

    if sig2letter[sig] == nil then sig2letter[sig] = {} end

    table.insert(sig2letter[sig], letters[i])

  end

end

-- [ILT][ILT]N[UY]?RA[ILT]NCANREA[DPOJ] :)

function fix(segidx, letters)

  local w, h = x2-x1, y2-y1

  local let = valuestokeys(letters)

  local cropped = {

    width = w,

    height = h,

    getInt = function(x, y)

      return img.getInt(x+x1, y+y1)

    end

  }

  -- distinguish I and T by width

  if let["I"] and let["T"] then

    local ratio = w/h

    let[ratio >= 0.5 and "I" or "T"] = nil

  end

  if let["T"] and let["L"] then

    let[upperToLowerWidth(cropped) < 1 and "T" or "L"] = nil

  end

  if let["I"] and let["L"] then

    let[upperToLowerWidth(cropped) <= 0.5 and "I" or "L"] = nil

  end

  if let["U"] and let["Y"] then

    local middleY = math.ceil(h/2)

    local middleWidth = getWidth(cropped, middleY)

    --[[local _x2 = getRightmostPoint(cropped, middleY)

    local _x1 = getLeftmostPoint(cropped, middleY)

    print("crop: ", x1, y1, x2, y2)

    print("middleWidth: "..middleWidth..", w: "..w..", middleY: "..middleY..", _x2: ".._x2..", _x1: ".._x1)

    for x=0, cropped.width-1 do

      print(cropped.getInt(x, middleY))

    end]]

    let[middleWidth/w <= 0.5 and "U" or "Y"] = nil

  end

  if let["D"] and let["P"] then

    local upper = upperMaxWidth(cropped)

    local lower = lowerMaxWidth(cropped)

    print("upper", upper, "lower", lower)

    let[upper/lower >= 2 and "D" or "P"] = nil

  end

  if let["O"] and let["P"] then

    let[upperMaxWidth(cropped)/lowerMaxWidth(cropped) >= 2 and "O" or "P"] = nil

  end

  if let["D"] and let["O"] then

    --local gx, gy = getCenterOfGravity(cropped)

    --print("gx", gx, "w", w)

    --let[gx >= w*0.4 and "D" or "O"] = nil

    local avgLeft = getAverageLeft(cropped)

    print("D/O: avgLeft/w", avgLeft/w)

    let[avgLeft/w >= 0.05 and "D" or "O"] = nil

  end

  if (let["D"] or let["O"] or let["P"]) and let["J"] then

    local avgLeft = getAverageLeft(cropped, math.floor(h*0.33), math.floor(h*0.6))

    --print("D/O vs J: avgLeft/w", avgLeft/w)

    if avgLeft/w >= 0.5 then

      let["D"], let["O"], let["P"] = nil, nil, nil

    else

      let["J"] = nil

    end

  end

  if (let["G"] or let["S"]) and let["Q"] then

    local yo, threshold = 8/9, 0.4

    local yy = math.floor(h*yo)

    local avgLeft = getAverageLeft(cropped, yy, h)

    print("G vs Q: avgLeft/w", avgLeft/w, "h", h, "yo", yo, "yy", yy)

    if avgLeft/w >= threshold then

      let["G"], let["S"] = nil, nil

    else

      let["Q"] = nil

    end

  end

  if let["G"] and let["S"] then

    local middleY = math.floor(h/2)

    local left = getLeftmostPoint(cropped, middleY)/w

    print("G vs S: left", left)

    let[left >= 0.15 and "G" or "S"] = nil

  end

  letters = keystolist(let)

  return letters

end

-- works on x1, lastX2

function isSpace()

  if lastX2 == nil then return false end

  local d = (x1-lastX2)/(y2-y1)

  --print("space dist", d)

  return d >= 0.3

end

make_sig2letter()

result = otherresults["#345"] or error("Need result of #345")

_, _, s = string.find(result, ": (.+)")

if s == nil then return end

parts = split(s, "|")

-- could also recalc this from parts

sigs = otherresults["#340"] or error("Need result of #340")

sigs = split(sigs, " ")

result = {}

for i=1, #sigs do

  sig = sigs[i]

  letters = sig2letter[sig]

  part = parts[i]

  lastX2 = x2

  x1, y1, x2, y2 = unpack(split(part, ", "))

  x1, y1, x2, y2 = tonumber(x1), tonumber(y1), tonumber(x2), tonumber(y2)

  if isSpace() then table.insert(result, " ") end

  s = ""

  if letters == nil then

    print("Unknown signature: "..sig)

    s = "?"

  else

    if #letters > 1 then

      letters = fix(i, letters)

    end

    if #letters == 1 then

      s = letters[1]

    else

      s = "["..table.concat(letters, "").."]"

    end

  end

  table.insert(result, s)

end

return table.concat(result, "")