Class: DetectFaces

Inherits:
Object
  • Object
show all
Defined in:
lib/detectfaces.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(fname = nil, haar_xml_file: File.join(File.dirname(__FILE__),\ 'haarcascade_frontalface_alt.xml')) ⇒ DetectFaces

Returns a new instance of DetectFaces.



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# File 'lib/detectfaces.rb', line 14

def initialize(fname=nil, haar_xml_file: File.join(File.dirname(__FILE__),\
     'haarcascade_frontalface_alt.xml'))

  @detector = OpenCV::CvHaarClassifierCascade::load haar_xml_file

  read(fname) if fname 

end

Instance Attribute Details

#faces ⇒ Object

Returns the value of attribute faces.



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# File 'lib/detectfaces.rb', line 12

def faces
  @faces
end

Instance Method Details

#read(fname) ⇒ Object 



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# File 'lib/detectfaces.rb', line 23

def read(fname)

  @fname = fname
  @faces = detect_faces(fname)

  self

end

#to_html ⇒ Object 



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# File 'lib/detectfaces.rb', line 32

def to_html()
  
  s = Base64.strict_encode64(File.open(@fname, "rb").read)
 
  style_faces = @faces.map.with_index do |detail, i|
    "#face%s { left: %spx; top: %spx; width: %spx; height: %spx; }" % \
        [i, *detail]
  end
  
  div_faces = @faces.map.with_index do |detail, i|
    "<div id='face%s'></div>" % i
  end    
  

"<!DOCTYPE html>\n<html>\n<head>\n  <style type=\"text/css\">\n    body {\n      margin: 0;\n      background: url(data:image/jpg;base64,\#{s}) \n      no-repeat top left;\n    }\n    \n    #faces div {position: absolute; border: 3px solid #1c1}\n    \#{style_faces.join(\"\\n      \")}\n  </style>\n</head>\n<body>\n  <div id='faces'>\n    \#{div_faces.join(\"\\n      \")}\n  </div>\n</body>\n</html>\n  HTML\n\nend\n"