Not logged in.  Login/Logout/Register | List snippets | | Create snippet | Upload image | Upload data

47
LINES

< > BotCompany Repo | #339 // Embeddable Signature Maker

Lua code

1  
brightnessThreshold = 0.9

2  
maxSignatureLen = 10

3  


4  
function rgb(i)



5  
  local r = bit32.band(bit32.rshift(i, 16), 255)



6  
    local g = bit32.band(bit32.rshift(i, 8), 255)



7  
    local b = bit32.band(i, 255)



8  
  return r, g, b



9  
end



10  


11  
function bright(r, g, b)



12  
  return (r+g+b)/(255*3)



13  
end



14  


15  
-- from Java class "SegmentCounter"



16  


17  
function countSegments(y, flip)



18  
  local lastPix = 1



19  
  local segments = 0



20  
  for x = 0, (flip and h or w)-1 do



21  
    local pix = bright(rgb(flip and img.getInt(y, x) or img.getInt(x, y)))



22  
    if pix >= brightnessThreshold and lastPix < brightnessThreshold then



23  
      segments = segments+1



24  
    end



25  
    lastPix = pix



26  
  end



27  
  if lastPix < brightnessThreshold then segments = segments+1 end



28  
  return segments



29  
end



30  


31  
function getSegmentSignature(flip)



32  
  local s = ""



33  
  



34  
  local lastN = 0



35  
  for y = 0, (flip and w or h)-1 do



36  
    local n = math.min(countSegments(y, flip), 9)



37  
    if n ~= lastN then



38  
      if #s >= maxSignatureLen then return nil end



39  
      s = s..n



40  
    end



41  
    lastN = n



42  
  end



43  
  if lastN == 0 and #s > 0 then



44  
    s = s:sub(1, #s-1)



45  
  end



46  
  return s



47  
end




        
Author comment

    
Began life as a copy of #334

    
test run  test run with input  download  show line numbers   
Travelled to 12 computer(s): aoiabmzegqzx, bhatertpkbcr, cbybwowwnfue, gwrvuhgaqvyk, ishqpsrjomds, lpdgvwnxivlt, mqqgnosmbjvj, pyentgdyhuwx, pzhvpgtvlbxg, tslmcundralx, tvejysmllsmz, vouqrxazstgt

  
Comments [hide]

	

	ID
	Author/Program
	Comment
	Date
 	

    
559 #1000610 Edit suggestion:
!636
!629

main {
  static Object androidContext;
  static String programID;

  public static void main(String[] args) throws Exception {
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


}}		 2015-08-18 20:25:42  delete  


557 #1000604 (pitcher)  2015-08-18 00:07:22 

 
 
add comment
      
      
  

  

    Snippet ID:
    #339
  

  

    Snippet name:
    Embeddable Signature Maker
  

    

    Eternal ID of this version:
    #339/1
  

  

    Text MD5:
    841909b563987c2791a18ce0639f0773
  

    

    Author:
    stefan
  

  

    Category:
    
  

  

    Type:
    Lua code
  

        

    Public (visible to everyone):
    Yes
  

  

    Archived (hidden from active list):
    No
  

  

    Created/modified:
      2015-01-25 01:56:44
  

  

    Source code size:
    1113 bytes / 47 lines
  

  

    Pitched / IR pitched:
    No / Yes
  

    

    Views / Downloads:
    972 / 156
  

      

    Referenced in:
[show references]