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Image acquisition package: Difference between revisions
formated example session
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(formated example session) |
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Lines starting with $ are commands executed on the octave prompt. | Lines starting with $ are commands executed on the octave prompt. | ||
=== Load the package and list available hardware === | |||
$ pkg load image-acquisition | $ pkg load image-acquisition | ||
$ imaqhwinfo | $ imaqhwinfo | ||
ans = | ans = | ||
scalar structure containing the fields: | scalar structure containing the fields: | ||
driver = uvcvideo | driver = uvcvideo | ||
card = UVC Camera (046d:0825) | card = UVC Camera (046d:0825) | ||
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capabilities = 83886081 | capabilities = 83886081 | ||
device = /dev/video0 | device = /dev/video0 | ||
=== Open the v4l2 device and output the result === | |||
$ obj = videoinput("v4l2", "/dev/video0") | $ obj = videoinput("v4l2", "/dev/video0") | ||
obj = videoinput for v4l2 | obj = videoinput for v4l2 | ||
device = /dev/video0 | device = /dev/video0 | ||
driver = uvcvideo | driver = uvcvideo | ||
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VideoResolution = 320 x 240 px | VideoResolution = 320 x 240 px | ||
VideoFrameInterval = 1/30 s (30.0 fps) | VideoFrameInterval = 1/30 s (30.0 fps) | ||
$ get(obj) | |||
ans = | === Query which properties are available for the used device === | ||
{ | The first 6 ones starting with an upper letter are fixed, the other specific to the used v4l2 device. | ||
$ get(obj) | |||
ans = | |||
{ | |||
[1,1] = SelectedSourceName | [1,1] = SelectedSourceName | ||
[2,1] = DeviceCapabilities | [2,1] = DeviceCapabilities | ||
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[17,1] = exposure_absolute | [17,1] = exposure_absolute | ||
[18,1] = exposure_auto_priority | [18,1] = exposure_auto_priority | ||
} | } | ||
=== Get device capabilities === | |||
$ get(obj, "DeviceCapabilities") | |||
ans = | |||
scalar structure containing the fields: | scalar structure containing the fields: | ||
driver = uvcvideo | driver = uvcvideo | ||
card = UVC Camera (046d:0825) | card = UVC Camera (046d:0825) | ||
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capabilities = 83886081 | capabilities = 83886081 | ||
=== List available video resolutions === | |||
$ set(obj, "VideoResolution") | $ set(obj, "VideoResolution") | ||
ans = | ans = | ||
640 480 | 640 480 | ||
160 120 | 160 120 | ||
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1280 960 | 1280 960 | ||
$ set(obj, "VideoResolution", [320 240]) | === Set the video resolution to 320x240px === | ||
$ get(obj, "brightness") | $ set(obj, "VideoResolution", [320 240]) | ||
ans = 100 | |||
=== Get the current brightness value === | |||
$ get(obj, "brightness") | |||
ans = 100 | |||
=== Query possible range for brightness === | |||
$ set(obj, "brightness") | |||
ans = | |||
scalar structure containing the fields: | scalar structure containing the fields: | ||
min = 0 | min = 0 | ||
max = 255 | max = 255 | ||
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default = 128 | default = 128 | ||
$ set(obj, "brightness", 100) | === Set a new value for brightness === | ||
$ | $ set(obj, "brightness", 100) | ||
$ preview(obj) | $ | ||
=== Start preview === | |||
Close it with CTRL+C or with [X] on the preview window | |||
$ preview(obj) | |||
== Using v4l2loopback for tests == | == Using v4l2loopback for tests == | ||