Class: Camera

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

Overview

Focus Inspector - The focus inspection and lens calibration software.

Copyright © 2012 by Chris Schlaeger <[email protected]>

This program is Open Source software; you can redistribute it and/or modify it under the terms of MIT license as shipped with this software.

Instance Method Summary collapse

Constructor Details

#initialize(imageFile) ⇒ Camera 



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# File 'lib/focusinspector/Camera.rb', line 13

def initialize(imageFile)
  @imageFile = imageFile
  @cameras = {
               'NIKON D300' =>
               begin
                 h = {}
                 xSkip = 0.0676
                 ySkip = 0.095
                 # Rows A to E.
                 (-2).upto(2) do |row|
                   # Rows A and E have only 9 points, the others have 11.
                   cols = row.abs == 2 ? 4 : 5
                   (-cols).upto(cols) do |col|
                   h["#{(?A.ord + row + 2).chr}#{col + cols + 1}"] =
                       [ 0.5 + col * xSkip, 0.5 + row * ySkip ]
                   end
                 end
                 h['C6 (Center)'] = h['C6']
                 h
               end,
               'NIKON D5100' =>
               begin
                 x = [ 0.225, 0.330, 0.5 ]
                 y = [ 0.295, 0.385, 0.5 ]
                 x[3] = x[2] + (x[2] - x[1])
                 x[4] = x[2] + (x[2] - x[0])
                 y[3] = y[2] + (y[2] - y[1])
                 y[4] = y[2] + (y[2] - y[0])
                 {
                   'Far Left'    => [ x[0], y[2] ],
                   'Upper-left'  => [ x[1], y[1] ],
                   'Mid-left'    => [ x[1], y[2] ],
                   'Lower-left'  => [ x[1], y[3] ],
                   'Top'         => [ x[2], y[0] ],
                   'Center'      => [ x[2], y[2] ],
                   'Bottom'      => [ x[2], y[4] ],
                   'Upper-right' => [ x[3], y[1] ],
                   'Mid-right'   => [ x[3], y[2] ],
                   'Lower-right' => [ x[3], y[3] ],
                   'Far Right'   => [ x[4], y[2] ]
                 }
               end,
               'NIKON D800' =>
               begin
                 h = {}
                 # Rows A to E.
                 (-2).upto(2) do |row|
                   # Rows A and E have only 9 points, the others have 11.
                   cols = row.abs == 2 ? 4 : 5
                   (-cols).upto(cols) do |col|
                     # The 3 center columns have a wider x and y spread.
                     if col.abs <= 1
                       xSkip = 0.053
                       xOff = 0.0
                       ySkip = 0.075
                     else
                       xSkip = 0.048
                       xOff = 0.011 * (col < 0 ? -1 : 1)
                       ySkip = 0.0659
                     end
                     h["#{(?A.ord + row + 2).chr}#{col + cols + 1}"] =
                       [ 0.5 + xOff + col * xSkip, 0.5 + row * ySkip ]
                   end
                 end
                 h['C6 (Center)'] = h['C6']
                 h
               end
             }
  # Add some aliases for similar cameras. Just a guess right now.
  @cameras['NIKON D300S'] = @cameras['NIKON D300']
  @cameras['NIKON D800E'] = @cameras['NIKON D800']

  unless (@exif = MiniExiftool.new(@imageFile))
    Log.error("Image file #{imageFile} has no EXIF information")
  end
  unless (modelName = @exif['Model'])
    Log.error("No camera model name found in image file #{imageFile}")
  end
  unless (@focusPoints = @cameras[modelName])
    Log.error("Camera #{modelName} is not supported.")
  end
  @width = @exif['ImageWidth'].to_i
  @height = @exif['ImageHeight'].to_i
  @cx = @width / 2
  @cy = @height / 2
end

Instance Method Details

#activeFocusPoints ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 161

def activeFocusPoints
  return [] if @exif['ContrastDetectAF'] == 'On'

  if (fps = @exif['AFPointsUsed']) == "(none)" or fps.nil?
    Log.error("Image has no focus point information")
  end

  allFPs = @focusPoints.keys.join(',')

  coords = []
  fps.split(',').each do |fp|
    unless (xy = fpCoords(fp))
      Log.error("Unknown focus point #{fp}")
    end
    coords << xy
  end
  coords
end

#contrastDetectAF? ⇒ Boolean 



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# File 'lib/focusinspector/Camera.rb', line 114

def contrastDetectAF?
  @exif['ContrastDetectAF'] == 'On'
end

#focusAreaSize ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 100

def focusAreaSize
  if (afW = @exif['AFAreaWidth']) && (afH = @exif['AFAreaHeight'])
    [ afW, afH ]
  else
    # We currently use a 27th of the screen width and height. This might have
    # to be made camera specific.
    [ @width / 27, @height / 27 ]
  end
end

#focusFineTune ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 122

def focusFineTune
  @exif['AFFineTuneAdj']
end

#focusPoint ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 118

def focusPoint
  @exif['Primary_AF_Point']
end

#inactiveFocusPoints ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 180

def inactiveFocusPoints
  return [] if @exif['ContrastDetectAF'] == 'On'

  if (fps = @exif['AFPointsUsed']) == "(none)" or fps.nil?
    Log.error("Image has no focus point information")
  end
  fps = fps.split(',')

  allFPs = @focusPoints.keys

  coords = []
  (allFPs - fps).each do |fp|
    coords << fpCoords(fp)
  end
  coords
end

#orientation ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 110

def orientation
  @exif['Orientation'] || "Horizontal (normal)"
end

#primaryAutoFocusPoint ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 137

def primaryAutoFocusPoint
  if @exif['ContrastDetectAF'] != 'On'
    if (primaryAFP = @exif['Primary_AF_Point']) == "(none)" or primaryAFP.nil?
      Log.error("Image has no primary focus point information")
    end

    unless (coords = fpCoords(primaryAFP))
      Log.error("Unknown focus point #{primaryAFP}")
    end
    return coords
  else
    unless (x = @exif['AFAreaXPosition'])
      Log.error('Contrast detect focus X position not found')
    end
    x = x.to_i
    unless (y = @exif['AFAreaYPosition'])
      Log.error('Contrast detect focus Y position not found')
    end
    y = y.to_i

    return [ x, y ]
  end
end

#printDetails ⇒ Object 



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# File 'lib/focusinspector/Camera.rb', line 126

def printDetails
  puts "Focus Mode:              #{@exif['FocusMode']}"
  puts "Contrast Detection:      #{@exif['ContrastDetectAF']}"
  puts "Phase Detection:         #{@exif['PhaseDetectAF']}"
  puts "AF Fine Tune:            #{@exif['AFFineTune']}"
  puts "AF Fine Tune Adjustment: #{@exif['AFFineTuneAdj']}"
  puts "Focus Distance:          #{@exif['FocusDistance']}"
  puts "Depth Of Field:          #{@exif['DOF']}"
  puts "Hyperfocal Distance:     #{@exif['HyperfocalDistance']}"
end