camelot

A node wrapper for fswebcam controller providing configurable async frame grabbing. Grab frames, receive frame events!

How it works

Once grabbing starts ( *grab , frames are periodically grabbed off the web cam (/dev/videoX) depending on the provided frequency option. Within Camelot, once a frame is grabbed, an event is emitted ( on (‘frame’, …) ) containing the binary frame. Also, instead of relying on event emission, a callback can also be passed to the grab() function, which will apply the callback upon frame grabbing. As per convensional wisdom, an error event will also be emitted upon Error ( on (‘error’, …) ).

Examples

var Camelot = require('./camelot.js');

var camelot = new Camelot( {
  'rotate' : '180',
  'flip' : 'v'
});

camelot.on('frame', function (image) {
  console.log('frame received!');
});

camelot.on('error', function (err) {
  console.log(err);
});

camelot.grab( {
  'title' : 'Camelot',
  'font' : 'Arial:24',
  'frequency' : 1    
});

Features

• Infinit frame grabbing based on frequency (in sec).
• Banner
• Png/Jpeg
• Rotation
• Resolution

Supported Capture Options

    focus : 'auto',
    brightness : 0,
    contrast : 136,
    saturation : 150,
    hue : 0,
    gamma : 100,
    sharpness : 50

with default values.

ChangeLog

0.0.4

• Port event emitting to v0.8 ** event emitting ** sys v. util ** path v. fs ** travis continuous integration

0.0.3

• Initial public release

Installation

Requirements

This module assumes you have a working binary of fswebcam along with font management library and associated font path definition (e.g. GDFONTPATH). This module has been solely tested on Ubuntu with a Rocketfish 8MP USB HD RF-HDWEB webcam but should work with any webcam supported by the v4l library.

Git Clone

$ git clone git://github.com/pdeschen/camelot.git

Install from npm

$ sudo npm install camelot [-g]

Todos

• Instead of relying on fswebcam binary, implement node native module using v4l.
• Since a webcam is a limited resource, a worker pool (of size 1) should be used to queue grabbing jobs.

License

(MIT license)

Copyright © 2011 Pascal Deschenes [e-mail]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.