高贵和红宝石 [英] Highgui and ruby

问题描述

我需要编写一个简单的项目，而我正在使用opencv，ruby和mac. 我已经通过brew安装了opencv，并通过gem install安装了rb_webcam.

I need to write one simple project and i'm using opencv, ruby and mac. I've installed opencv through brew and rb_webcam through gem install.

# -*- coding: utf-8 -*-

require "opencv"
require "rb_webcam"

capture = Webcam.new

此代码引发

$ ruby tracking.rb
/Users/evilgeniuz/.rvm/gems/ruby-1.9.3-p125/gems/nice-ffi-0.4/lib/nice-ffi/library.rb:98:in `load_library': Could not load highgui. (LoadError)
    from /Users/evilgeniuz/.rvm/gems/ruby-1.9.3-p125/gems/rb_webcam-0.3.0/lib/rb_webcam.rb:7:in `<module:Highgui>'
    from /Users/evilgeniuz/.rvm/gems/ruby-1.9.3-p125/gems/rb_webcam-0.3.0/lib/rb_webcam.rb:4:in `<top (required)>'
    from /Users/evilgeniuz/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:59:in `require'
    from /Users/evilgeniuz/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:59:in `rescue in require'
    from /Users/evilgeniuz/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/rubygems/custom_require.rb:35:in `require'
    from tracking.rb:4:in `<main>'

我不知道该怎么指向highgui在哪里.

I can't get how can i point where highgui is.

UPD: 通过从此处 https://github.com/TyounanMOTI/rb_webcam 下载gem来解决此问题手动.

UPD: Solved it by downloading gem from here https://github.com/TyounanMOTI/rb_webcam and building and installing it manually.

推荐答案

不确定使用的是哪个包装，但是您应该看一下:

Not sure which wrapper you are using, but you should take a look at this: Ruby/OpenCV - An OpenCV Ruby wrapper.

面部检测样本:

#!/usr/bin/env ruby

require 'opencv'

include OpenCV

# Load an image
img = IplImage.load('sample.jpg')

# Load the cascade for detecting faces
detector = CvHaarClassifierCascade::load('haarcascade_frontalface_alt.xml.gz')

# Detect faces and draw rectangles around them
detector.detect_objects(img) do |rect|
  img.rectangle!(rect.top_left, rect.bottom_right, color: CvColor::Red)
end

# Create a window and show the image
window = GUI::Window.new('Face Detection')
window.show(img)
GUI::wait_key

可以在此处下载分类器.

编辑:

以下代码使用OpenCV，rb_webcam gem和RMagick从网络摄像头捕获图像并将其另存为jpg文件:

The following code uses OpenCV, the rb_webcam gem, and RMagick to capture an image from a webcam and save it as a jpg file:

require 'rb_webcam'
require 'RMagick'

capture = Webcam.new

image = capture.grab
width = image.size[:width]
rows = image.data.unpack("C*").each_slice(3).to_a.each_slice(width).to_a
capture.close

height = rows.length
img = Magick::Image.new width, height

rows.each_with_index do |r, i|
q = r.map {|b, g, r| Magick::Pixel.new r * 256, g * 256, b * 256, 0}
img.store_pixels(0, i, width, 1, q)
end

img.format = 'jpg'
img.write 'webcam.jpg' 

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