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< > BotCompany Repo | #479 - Embeddable border finder (getcrop2)

Lua code

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get("#348") -- rgb functions
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brightnessThreshold = 0.9
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function getcrop2(img)
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  local w, h, g = img.width, img.height, img.getInt
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  local x1, y1, x2, y2 = 0, 0, w, h
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  -- left side
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  while x1 < x2 do
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    for y=y1, y2-1 do
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      if bright(rgb(g(x1, y))) <= brightnessThreshold then goto out0 end
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    end
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    x1=x1+1
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  end
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  ::out0::
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  -- top side
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  while y1 < y2 do
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    for x=x1, x2-1 do
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      if bright(rgb(g(x, y1))) <= brightnessThreshold then goto out1 end
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    end
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    y1=y1+1
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  end
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  ::out1::
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  -- right side
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  while x2 > x1 do
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    for y=y1, y2-1 do
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      if bright(rgb(g(x2-1, y))) <= brightnessThreshold then goto out2 end
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    end
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    x2=x2-1
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  end
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  ::out2::
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  -- bottom side
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  while y2 > y1 do
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    for x=x1, x2-1 do
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      if bright(rgb(g(x, y2-1))) <= brightnessThreshold then goto out3 end
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    end
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    y2=y2-1
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  end
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  ::out3::
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  if x2 <= x1 or y2 <= y1 then -- weird result? return full image
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    x1, y1, x2, y2 = 0, 0, w, h
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  end
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  return x1, y1, x2, y2
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end

Author comment

Began life as a copy of #346

Assumes light background

test run  test run with input  download  show line numbers   

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Snippet ID: #479
Snippet name: Embeddable border finder (getcrop2)
Eternal ID of this version: #479/1
Text MD5: 3e44e068229f1d1ff9a50cbfe2f82e8c
Author: stefan
Category: image recognition
Type: Lua code
Public (visible to everyone): Yes
Archived (hidden from active list): No
Created/modified: 2015-03-08 17:45:03
Source code size: 1062 bytes / 55 lines
Pitched / IR pitched: No / Yes
Views / Downloads: 468 / 86
Referenced in: [show references]

Formerly at http://tinybrain.de/479 & http://479.tinybrain.de