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Image acquisition package: Difference between revisions
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replaced $ with octave>, added start & stop streaming, getsnapshot
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(replaced $ with octave>, added start & stop streaming, getsnapshot) |
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$ tar czf image-acquisition.tar.gz octave-image-acquisition | $ tar czf image-acquisition.tar.gz octave-image-acquisition | ||
octave:>> pkg install image-acquisition.tar.gz | octave:>> pkg install image-acquisition.tar.gz | ||
If you want to report a bug see [[Image_acquisition_package#Reporting_bugs]] | |||
== Example session == | == Example session == | ||
Lines starting with | Lines starting with octave> are executed on the octave prompt. | ||
=== Load the package and list available hardware === | === Load the package and list available hardware === | ||
octave> pkg load image-acquisition | |||
octave> imaqhwinfo | |||
ans = | ans = | ||
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=== Open the v4l2 device and output the result === | === Open the v4l2 device and output the result === | ||
octave> obj = videoinput("v4l2", "/dev/video0") | |||
obj = videoinput for v4l2 | obj = videoinput for v4l2 | ||
device = /dev/video0 | device = /dev/video0 | ||
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=== Query which properties are available for the used device === | === 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. | The first 6 ones, starting with an upper letter are fixed, the other specific to the used v4l2 device. | ||
octave> get(obj) | |||
ans = | ans = | ||
{ | { | ||
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=== Get device capabilities === | === Get device capabilities === | ||
octave> get(obj, "DeviceCapabilities") | |||
ans = | ans = | ||
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=== List available video resolutions === | === List available video resolutions === | ||
octave> set(obj, "VideoResolution") | |||
ans = | ans = | ||
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=== Set the video resolution to 320x240px === | === Set the video resolution to 320x240px === | ||
octave> set(obj, "VideoResolution", [320 240]) | |||
=== Get the current brightness value === | === Get the current brightness value === | ||
octave> get(obj, "brightness") | |||
ans = 100 | ans = 100 | ||
=== Query possible range for brightness === | === Query possible range for brightness === | ||
octave> set(obj, "brightness") | |||
ans = | ans = | ||
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=== Set a new value for brightness === | === Set a new value for brightness === | ||
octave> set(obj, "brightness", 100) | |||
=== Start preview === | === Start preview === | ||
octave> preview(obj) | |||
Close it with CTRL+C or with [X] on the preview window | Close it with CTRL+C or with [X] on the preview window | ||
=== Use higher resolution and start streaming with 2 buffers === | |||
octave> set(obj, "VideoResolution", [640 480]); | |||
octave> start(obj, 2) | |||
=== Get an image from the buffers, view and save it === | |||
octave> img = getsnapshot(obj); | |||
octave> image(img) | |||
octave> imwrite(img, "ex1_a.png") | |||
octave> [img, seq, t] = getsnapshot(obj); | |||
octave> seq | |||
seq = 1 | |||
octave> t | |||
t = | |||
scalar structure containing the fields: | |||
tv_sec = 19618 | |||
tv_usec = 346553 | |||
=== Stop streaming === | |||
octave> stop(obj) | |||
== Using v4l2loopback for tests == | == Using v4l2loopback for tests == | ||
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Consider running the included tests: | Consider running the included tests: | ||
test @videoinput/videoinput | octave> test @videoinput/videoinput | ||
test @videoinput/get | octave> test @videoinput/get | ||
test @videoinput/set | octave> test @videoinput/set | ||
test @videoinput/getsnapshot | octave> test @videoinput/getsnapshot | ||