1 | ###########################################################################
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2 | #
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3 | # AdvImagePlugin.pm -- extends the standard ImagePlugin with feature
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4 | # extraction using the OpenSIFT program. SIFT, in
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5 | # turn, requires the OpenCV libraries.
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6 | #
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7 | # A component of the Greenstone digital library software from the New
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8 | # Zealand Digital Library Project at the University of Waikato, New
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9 | # Zealand.
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10 | #
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11 | # Copyright (C) 1999 New Zealand Digital Library Project
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12 | #
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13 | # This program is free software; you can redistribute it and/or modify
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14 | # it under the terms of the GNU General Public License as published by
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15 | # the Free Software Foundation; either version 2 of the License, or
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16 | # (at your option) any later version.
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17 | #
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18 | # This program is distributed in the hope that it will be useful,
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19 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 | # GNU General Public License for more details.
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22 | #
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23 | # You should have received a copy of the GNU General Public License
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24 | # along with this program; if not, write to the Free Software
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25 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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26 | #
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27 | ###########################################################################
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28 |
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29 | package AdvImagePlugin;
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30 |
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31 | use ImagePlugin;
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32 |
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33 | use strict;
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34 | no strict 'refs'; # allow filehandles to be variables and viceversa
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35 | no strict 'subs';
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36 |
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37 | use gsprintf 'gsprintf';
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38 |
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39 | sub BEGIN {
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40 | @AdvImagePlugin::ISA = ('ImagePlugin');
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41 | }
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42 |
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43 | my $arguments =
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44 | [ { 'name' => "process_exp",
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45 | 'desc' => "{BasePlugin.process_exp}",
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46 | 'type' => "regexp",
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47 | 'deft' => &get_default_process_exp(),
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48 | 'reqd' => "no" },
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49 | ];
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50 |
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51 | my $options = { 'name' => "AdvImagePlugin",
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52 | 'desc' => "{ImagePlugin.desc}",
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53 | 'abstract' => "no",
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54 | 'inherits' => "yes",
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55 | 'args' => $arguments };
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56 |
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57 |
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58 | ## @function
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59 | #
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60 | sub new {
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61 | my ($class) = shift (@_);
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62 | my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
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63 | push(@$pluginlist, $class);
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64 | push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
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65 | push(@{$hashArgOptLists->{"OptList"}},$options);
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66 | my $self = new ImagePlugin($pluginlist, $inputargs, $hashArgOptLists);
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67 | $self->{'sift_available'} = 0;
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68 | return bless $self, $class;
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69 | }
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70 | ##
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71 |
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72 |
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73 | ## @function
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74 | #
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75 | sub init {
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76 | my $self = shift (@_);
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77 | my ($verbosity, $outhandle, $failhandle) = @_;
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78 | $self->SUPER::init(@_);
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79 | # Test that OpenSIFT is available... otherwise nothing else is going to work
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80 | my $sift_version = `siftfeat -h 2>&1`;
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81 | if ($sift_version =~ /siftfeat version \d+\.\d+\.\d+/)
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82 | {
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83 | $self->{'sift_available'} = 1;
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84 | }
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85 | }
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86 | ##
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87 |
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88 |
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89 | ## @function
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90 | # - for now we'll restrict to JPGs because I know OpenSIFT likes them
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91 | sub get_default_process_exp {
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92 | my $self = shift (@_);
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93 | return q^(?i)\.(jpe?g)$^;
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94 | }
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95 | ##
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96 |
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97 |
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98 | ## @function
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99 | # do plugin specific processing of doc_obj
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100 | sub process {
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101 | my $self = shift (@_);
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102 | my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;
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103 |
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104 | $self->SUPER::process($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli);
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105 |
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106 | my $outhandle = $self->{'outhandle'};
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107 | my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);
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108 |
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109 |
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110 | if ($self->{'sift_available'} == 1)
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111 | {
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112 | # we call SIFT on the image, and then read the Oxford formatted features
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113 | # from STDOUT
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114 | # any other messages on STDERR are sent to nullsville
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115 | my $sift_command = 'siftfeat -x "' . $filename_full_path . '" 2>/dev/null';
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116 | my $oxfd_features = `$sift_command`;
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117 | $doc_obj->add_metadata ($doc_obj->get_top_section(), "SIFTOXFDFeatures", $oxfd_features);
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118 | }
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119 | else
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120 | {
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121 | print STDERR 'Warning! SIFT features cannot be extracted: ' . $file . "\n";
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122 | }
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123 | return 1;
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124 | }
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125 |
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126 | 1;
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127 |
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128 |
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129 |
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130 |
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131 |
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132 |
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133 |
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134 |
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135 |
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136 |
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137 |
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