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< > BotCompany Repo | #478 - Horizontal split with crop (include)

Lua code

get("#348") -- rgb functions
get("#346") -- getcrop
get("#337") -- map(list, f)
get("#388") -- rectangle functions

brightnessThreshold = 0.9

function horizontalsplit(img)
  local function isEmpty(x)
    for y=0, img.height-1 do
      if bright(rgb(img.getInt(x, y))) <= brightnessThreshold then
        return false
      end
    end
    return true
  end

  local lastEmpty, start = true, nil
  local segments = {}
  
  for x=0, img.width-1 do
    empty = isEmpty(x)
    if empty and not lastEmpty then
      table.insert(segments, {start, x})
    elseif not empty and lastEmpty then
      start = x
    end
    lastEmpty = empty
  end
  
  if not lastEmpty then
    table.insert(segments, {start, img.width})
  end
  
  if #segments <= 1 then -- don't bother with only 1 segment
    return {}
  end
  
  local result = {}
  for _, seg in ipairs(segments) do
    local sx1, sx2 = unpack(seg)
    
    local cropped = {
      width = sx2-sx1,
      height = img.height,
      getInt = function(x, y)
        return img.getInt(x+sx1, y)
      end
    }
    local x1, y1, x2, y2 = getcrop(cropped)
    table.insert(result, newRectangle(x1+sx1, y1, x2-x1, y2-y1))
  end
  return result
end

Author comment

Began life as a copy of #345

test run  test run with input  download  show line numbers   

Travelled to 10 computer(s): aoiabmzegqzx, bhatertpkbcr, cbybwowwnfue, gwrvuhgaqvyk, ishqpsrjomds, lpdgvwnxivlt, mqqgnosmbjvj, pzhvpgtvlbxg, tslmcundralx, tvejysmllsmz

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Snippet ID: #478
Snippet name: Horizontal split with crop (include)
Eternal ID of this version: #478/1
Text MD5: cbc8adaf3de51544d5ca7de9cbeda693
Author: stefan
Category:
Type: Lua code
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2015-02-25 19:25:17
Source code size: 1243 bytes / 54 lines
Pitched / IR pitched: No / Yes
Views / Downloads: 592 / 72
Referenced in: [show references]

Formerly at http://tinybrain.de/478 & http://478.tinybrain.de