Difference between revisions of "Video API Extensions legacy"

From ElphelWiki
Jump to: navigation, search
(→‎Obtaining static and dynamic images)
 
(4 intermediate revisions by 3 users not shown)
Line 1: Line 1:
 +
{{Manual legacy_pages}}
 +
 
{{en|ru=Video_API_Extensions.Ru|cn=Video_API_Extensions.cn}}
 
{{en|ru=Video_API_Extensions.Ru|cn=Video_API_Extensions.cn}}
  
−
The current implementation of the Video API has a number of features which are absent from the standard Axis Video API.
+
The current implementation of the [[Video API]] has a number of features which are absent from the [[AxisAPI|standard Axis Video API]].
  
  
Line 37: Line 39:
 
|-
 
|-
 
|e_flipv ||-|| flip (mirror) image vertically (uses in-sensor capabilities)
 
|e_flipv ||-|| flip (mirror) image vertically (uses in-sensor capabilities)
−
|-
 
−
|e_quality ||-|| JPEG Quality (%)
 
 
|-
 
|-
 
|e_exp_time ||-|| exposure time (0.1 msec step)
 
|e_exp_time ||-|| exposure time (0.1 msec step)
Line 116: Line 116:
  
 
Window settings:
 
Window settings:
−
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_Exposure.E_WinWidth=30&ImageSource.I0.Sensor.E_Exposure.E_WinHeight=45&ImageSource.I0.Sensor.E_Exposure.E_WinLeft=10&ImageSource.I0.Sensor.E_Exposure.E_WinTop=20</nowiki>
+
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_Exposure.WinWidth=30&ImageSource.I0.Sensor.E_Exposure.WinHeight=45&ImageSource.I0.Sensor.E_Exposure.WinLeft=10&ImageSource.I0.Sensor.E_Exposure.WinTop=20</nowiki>
  
 
Exposure max.values:
 
Exposure max.values:
−
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_Exposure.E_Max=3000&ImageSource.I0.Sensor.E_Exposure.E_OverMax=30</nowiki>
+
  <nowiki>http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.MaxExposureTime=3000&ImageSource.I0.Sensor.E_Exposure.OverMax=30</nowiki>

Latest revision as of 15:43, 24 August 2008

This is a legacy page. The information bellow is not compatible with Elphel 393 or 353/363 series cameras.

in English | [[{{{de}}}|deutsch]] | [[{{{fr}}}|français]] | по-русски | автоперевод | 中文版 | 机械翻译


The current implementation of the Video API has a number of features which are absent from the standard Axis Video API.


Enabling extensions

By default the Video API extensions are blocked. To unblock them it is necessary to set a corresponding variable: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ElphelExtensions.Enabled=yes


Obtaining static and dynamic images

The standard interface for obtaining static and dynamic images in JPEG and MJPG formats has a few additional parameters.

e_dcm_hor - horizontal decimation (resolution/image size reduction)
e_dcm_vert - vertical decimation (resolution/image size reduction)
e_bin_hor - horizontal binning (sensitivity for lower resolution)
e_bin_vert - vertical binning (sensitivity for lower resolution)
e_woi_width - sensor active window width (before decimation)
e_woi_height - sensor active window height (before decimation)
e_woi_left - sensor active window left margin (before decimation)
e_woi_top - sensor active window top margin (before decimation)
e_virt_width - virtual frame width
e_virt_height - virtual frame height
e_fliph - flip (mirror) image horizontally (uses in-sensor capabilities)
e_flipv - flip (mirror) image vertically (uses in-sensor capabilities)
e_exp_time - exposure time (0.1 msec step)
e_gamma - gamma correction value (%)
e_pixel_low - black level
e_pixel_high - white level
e_saturation_blue - color Saturation (%), Blue
e_saturation_red - color Saturation (%), Red
e_gain_r - analog gain RED (or mono)
e_gain_g - analog gain GREEN (or green in "red" line)
e_gain_b - analog gain BLUE
e_gain_gb - analog gain GREEN in "blue" line)
e_spec_kac_gga - Kodak KAC1310 analog gain Y (all colors)
e_spec_kac_ggb - Kodak KAC1310 analog gain ? (all colors)
e_spec_kac_ggm - Kodak KAC1310 mode

Examples

Example of obtaining a static image - use the following parameters: 

http://192.168.0.9/axis-cgi/jpg/image.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600

Example of obtaining a dynamic image (MPJPG) - use the following parameters: 

http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600

You can play this videostream, for example, by using MPlayer (for a more detailed description see Using Mplayer With Video API): 

$mplayer -demuxer lavf "http://192.168.0.9/axis-cgi/mjpg/video.cgi?e_dcm_hor=2&e_dcm_vert=2&e_woi_width=1000&e_woi_height=900&e_woi_left=600&bogus.mjpg"

If any of the parameters are not specified, the default values are used. You can find these values at the address: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.Sensor

Note: All API extensions have the prefix "E_".

You can change the default value in the standard way for the Axis Video API. For example: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_DcmHor=1

Obtaining information about the system status and default values

To obtain information about the system status variable you must use the following path: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState

In an addition to the standard "rfc" format there is also the possibility to use XML format. You must use the responseformat parameter for this. For example: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState&responseformat=xml

Note. If the responseformat is not specified or specified incorrectly, the default value of "rfc" will be used.


Video streaming: RTP/MJPG and RTP/Theora

The Elphel cameras can transfer the video stream by RTP protocol.

RTP/MJPG

RTP/Theora

Exposure control

The Elphel cameras support the standard and advanced exposure control interface. For the standard settings see Video_API

To enable autoexposure it is necessary to use the following command: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.Exposure=auto

Enabling the manual control of exposure: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.Exposure=manual

Obtaining the exposure state: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=list&group=ImageSource.I0.E_CurrentState.E_Exposure

Window settings: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.E_Exposure.WinWidth=30&ImageSource.I0.Sensor.E_Exposure.WinHeight=45&ImageSource.I0.Sensor.E_Exposure.WinLeft=10&ImageSource.I0.Sensor.E_Exposure.WinTop=20

Exposure max.values: 

http://192.168.0.9/axis-cgi/admin/param.cgi?action=update&ImageSource.I0.Sensor.MaxExposureTime=3000&ImageSource.I0.Sensor.E_Exposure.OverMax=30
Retrieved from "https://wiki.elphel.com/index.php?title=Video_API_Extensions_legacy&oldid=5176"