Image acquisition package: Difference between revisions

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== Example session ==
== Example session ==
Lines starting with $ are commands executed on the octave prompt.
Let's load the package and list available hardware
<code>
$ pkg load image-acquisition
$ imaqhwinfo
ans =
  scalar structure containing the fields:
    driver = uvcvideo
    card = UVC Camera (046d:0825)
    bus_info = usb-0000:00:16.2-2
    version = 3.2.51
    capabilities =  83886081
    device = /dev/video0
</code>
$
$ obj = videoinput("v4l2", "/dev/video0")
obj = videoinput for v4l2
      device            = /dev/video0
      driver            = uvcvideo
      card              = UVC Camera (046d:0825)
      VideoInput        = 0
      VideoResolution    = 320 x 240 px
      VideoFrameInterval = 1/30 s (30.0 fps)
$ get(obj)
ans =
{
  [1,1] = SelectedSourceName
  [2,1] = DeviceCapabilities
  [3,1] = VideoInput
  [4,1] = VideoResolution
  [5,1] = VideoFrameInterval
  [6,1] = VideoFormat
  [7,1] = brightness
  [8,1] = contrast
  [9,1] = saturation
  [10,1] = white_balance_temperature_auto
  [11,1] = gain
  [12,1] = power_line_frequency
  [13,1] = white_balance_temperature
  [14,1] = sharpness
  [15,1] = backlight_compensation
  [16,1] = exposure_auto
  [17,1] = exposure_absolute
  [18,1] = exposure_auto_priority
}
$
$ get(obj, "DeviceCapabilities")
ans =
  scalar structure containing the fields:
    driver = uvcvideo
    card = UVC Camera (046d:0825)
    bus_info = usb-0000:00:16.2-2
    version = 3.2.51
    capabilities =  83886081
$
$ set(obj, "VideoResolution")
ans =
    640    480
    160    120
    176    144
    320    176
    320    240
    352    288
    432    240
    544    288
    640    360
    752    416
    800    448
    800    600
    864    480
    960    544
    960    720
  1024    576
  1184    656
  1280    720
  1280    960
$ set(obj, "VideoResolution", [320 240])
$
$ get(obj, "brightness")
ans =  100
$ set(obj, "brightness")
ans =
  scalar structure containing the fields:
    min = 0
    max =  255
    step =  1
    default =  128
$ set(obj, "brightness", 100)
$
$ preview(obj)


== Using v4l2loopback for tests ==
== Using v4l2loopback for tests ==
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