添加 gem“tesseract-ocr”rails 4 后尝试运行服务器时出错答案

【问题标题】：error while trying to run the server after adding the gem "tesseract-ocr" rails 4添加 gem“tesseract-ocr”rails 4 后尝试运行服务器时出错
【发布时间】：2015-12-07 11:47:34
【问题描述】：

我试图制作一个 OCR 应用程序，在将 gem 添加到运行服务器的 gemfile“tesseract-ocr”后，它显示以下错误：

    /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-1.9.10/lib/ffi/library.rb:133:in `block in ffi_lib': Could not open library '/var/folders/1z/tn3pp1b90fvb5dh_7t2_kt2c0000gn/T/.ffi-inline-501/55a18292181116dcb44d5cd16f74500e379c7f92.dylib': dlopen(/var/folders/1z/tn3pp1b90fvb5dh_7t2_kt2c0000gn/T/.ffi-inline-501/55a18292181116dcb44d5cd16f74500e379c7f92.dylib, 5): Library not loaded: /usr/local/lib/libjpeg.8.dylib (LoadError)
  Referenced from: /usr/local/lib/liblept.4.dylib
  Reason: Incompatible library version: liblept.4.dylib requires version 13.0.0 or later, but libjpeg.8.dylib provides version 12.0.0
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-1.9.10/lib/ffi/library.rb:100:in `map'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-1.9.10/lib/ffi/library.rb:100:in `ffi_lib'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-inline-0.0.4.3/lib/ffi/inline/builders.rb:90:in `block in build'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-inline-0.0.4.3/lib/ffi/inline/builders.rb:87:in `instance_eval'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-inline-0.0.4.3/lib/ffi/inline/builders.rb:87:in `build'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-inline-0.0.4.3/lib/ffi/inline/inline.rb:54:in `singleton_inline'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/ffi-inline-0.0.4.3/lib/ffi/inline/inline.rb:39:in `inline'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract/c.rb:34:in `<module:C>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract/c.rb:31:in `<module:Tesseract>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract/c.rb:29:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract/api.rb:26:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract/api.rb:26:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract-ocr.rb:35:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/tesseract-ocr-0.1.8/lib/tesseract-ocr.rb:35:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `each'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:72:in `block in require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `each'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler/runtime.rb:61:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/bundler-1.10.6/lib/bundler.rb:134:in `require'
    from /Users/brijesh/Desktop/project/nepal-receipt-processing-2/config/application.rb:15:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:79:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:79:in `block in server'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:76:in `tap'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:76:in `server'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/commands/commands_tasks.rb:40:in `run_command!'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/app_rails_loader.rb:43:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/app_rails_loader.rb:43:in `block in exec_app_rails'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/app_rails_loader.rb:32:in `loop'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/app_rails_loader.rb:32:in `exec_app_rails'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/lib/rails/cli.rb:5:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/bin/rails:9:in `require'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/gems/railties-4.1.4/bin/rails:9:in `<top (required)>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/bin/rails:23:in `load'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/bin/rails:23:in `<main>'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `eval'
    from /Users/brijesh/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `<main>'

我在互联网上搜索了很多，但找不到解决方案。非常感谢您的帮助。

【问题讨论】：

你已经在你的电脑上安装了 tesseract lib 吗？ (github.com/tesseract-ocr/tesseract)。这个 gem 是这个库的包装器。
是的，tesseract 已安装在计算机中。我已经尝试卸载并再次安装它，但结果相同。

标签： ruby ruby-on-rails-4 rubygems ocr tesseract

【解决方案1】：

实际上问题是在 mac 上安装了 tesseract，它安装了 tesseract-ocr gem 已经失去兼容性的当前版本。

The solution in this answer 展示了如何安装与当前（截至 2016 年 5 月）tesseract-ocr 0.1.8 gem 兼容的旧版本 tesseract

brew install https://raw.githubusercontent.com/Homebrew/homebrew/8ba134eda537d2cee7daa7ebdd9f728389d9c53e/Library/Formula/tesseract.rb

【讨论】：