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webcam - image grabber and uploader…  more info»


webcam(1)                                                  webcam(1)

       webcam  - capture images and upload them to a webserver using

       webcam [ config file ]

       webcam captures images from a video4linux device  like  bttv,
       annotates  them and and uploads them to a webserver using ftp
       in a endless loop.

       At startup webcam reads the configuration from the given con‐
       fig  file  or ~/.webcamrc if none is specified in the command

       The config file has at least two sections.  The  "grab"  sec‐
       tion   holds  the  capture  parameters.   Any  other  section
       describes where the image should be uploaded.  Older versions
       used  "ftp"  as  name  for that section.  Recently the webcam
       utility got support for multiple connections, thus  any  sec‐
       tion name is accepted and you can have more than one ftp sec‐
       tion (you have to use another name for each section througth,
       name them by upload servers for example).

       Here  is  an  sample  config  file  (the given values are the

       device = /dev/video0
       driver = libv4l
       text = "webcam %Y-%m-%d %H:%M:%S"
       infofile = filename
       fg_red = 255
       fg_green = 255
       fg_blue = 255
       width = 320
       height = 240
       delay = 3
       wait = 0
       input = composite1
       norm = pal
       rotate = 0
       top = 0
       left = 0
       bottom = -1
       right = -1
       quality = 75
       trigger = 0
       once = 0

       host = www
       user = webcam
       pass = xxxxxx
       dir  = public_html/images
       file = webcam.jpeg
       tmp  = uploading.jpeg
       passive = 1
       debug = 0
       auto = 0
       local = 0
       ssh = 0

       The annotation text is processed with  strftime.   Check  the
       strftime(3)  or date(1) manpage to see how you can format the
       timestamps.  The text can also be read  from  a  extern  file
       (use  infofile  for  that).   The  default color for the text
       overlay is white (RGB=255,255,255). Entries in the range of 0
       through  255 for fg_red, fg_green, and fg_blue can be used to
       define a different color.   Likewise  bg_red,  bg_green,  and
       bg_blue  can  be  used  to  set  the  background color (which
       defaults to transparent).

       input is the video source (TV/composite/whatever),  norm  the
       TV  norm.   delay is the delay between two images in seconds.
       wait is the initial delay before the first image  is  grabbed
       (some  cameras need some time for adapting to lightning, thus
       don't return images with reasonable quality within the  first
       few seconds ...).  quality is the JPEG quality for the stored

       top, bottom, left, and right in the grab section allow  crop‐
       ping  the  image  after  it  is grabbed.  They should satisfy
       0<=top<bottom<=height and 0<=left<right<=width.  (0,0 is  the
       top,  left  corner.)  If rotate is positive, the output image
       will be rotated counter-clockwise 90 degrees that  number  of
       times (1, 2, or 3).

       With  trigger  set to a non-zero value webcam will upload the
       image only if the content of the image has changed.  It  just
       looks  for  the  maximum difference between the last uploaded
       and current image and if it is  greater  than  the  specified
       value the image will be uploaded.  If once is set to 1 webcam
       will upload a single frame and quit.

       archive can be used to create a (local) archive of the webcam
       images.  Just specify the filename for the files as argument.
       The filename will be processed with strftime(3), so  you  can
       use  the place the usual time format controls into the string
       to get unique filenames.  Non-existing directories  are  cre‐
       ated if needed.

       If debug in the ftp section is set to 1 the complete communi‐
       cation between webcam and  the  ftp  utility  is  printed  to
       stderr.   auto enables autologin via ~/.netrc (starts the ftp
       utility without the '-n' switch, check the  ftp(1)  man  page
       for  more info about the ~/.netrc file).  If local in the ftp
       section is non-zero, files will be stored locally (using  the
       dir, tmp, and file parameters) rather than ftped.  ssh set to
       non-zero makes webcam use ssh instead of ftp.

       contributed by Frederic Helin, the parameters belong into the
       [grab] section of the config file too.

       distor = 1
              If distor param is set to 1, the correction of distor‐
              tion works.

       distor_k = 700
              This is the coefficient of distortion. This  algorithm
              is  based on the paper "Correcting Distortion of Image
              by Image Registration" of Toru Tamaki, Tsuyoshi  Yama‐
              mura  and Noboru Ahnishi. More your lens has an impor‐
              tant distortion, more 'distor_k' must be neared of  0.
              700  is the default value. Coefficient k of program is
              x100 than article.

       distor_cx = 192

       distor_cy = 144
              Coordinates of the  lens  optical  axis:  width/2  and
              height/2  are  the default values. The axis doesn't go
              through the image center. So, you can change its coor‐
              dinates  around  the center of image to affine correc‐

       distor_zoom = 30
              Zoom parameter is used to cache the distorted  borders
              of  image,  if  you  don't like this. Default value is

       distor_sensorw = 320

       distor_sensorh = 240
              Dimensions of camera sensor. Default  values  are  for
              1/4p  sensor.  This parameters used to have the same k
              coefficient than article.

       Gerd Knorr <>

       Copyright (C) 1997-2002 Gerd Knorr
       This program is distributed in the hope that it will be  use‐
       ful,  but WITHOUT ANY WARRANTY; without even the implied war‐

                      (c) 1998-2000 Gerd Knorr             webcam(1)
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