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Javascript - control webcam - capabilities issue
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I am trying to control my webcam focus in Chrome Web browser (electron) running on Ubuntu desktop.
Basically, what I want is just to take picture of an object placed on a precise location. I need to read strings on this object and my autofocus webcam is sometimes not very good, that is why I want to control it.
I am trying to adjust the focus via the GetUserMedia api, but seems that it is not supported on my webcam(Logitech c920), here is what I get from getCapability():
aspectRatio
brightness
colorTemperature
contrast
deviceId
exposureCompensation
exposureMode
facingMode
focusMode
frameRate
groupId
height
saturation
sharpness
whiteBalanceMode
width
zoom
As you can notice, my device does not list FocusDistance or pointOfInterests as constraints, hence I can not manually set the focus.
Reference to the doc here
1) Why does FocusMode option is available? In the documentation I can only set this contraint as 'auto' or 'manual', but as I can not control the FocusDistance, seems it is useless.
2) Does it exist a list of webcam supporting these contraints?
3) As an alternative, would it be possible to set the contraint directly with Linux command line but still get the result in chrome?
Many Thanks,
Matt
javascript
google-chrome webcam asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
add a comment |
I am trying to control my webcam focus in Chrome Web browser (electron) running on Ubuntu desktop.
Basically, what I want is just to take picture of an object placed on a precise location. I need to read strings on this object and my autofocus webcam is sometimes not very good, that is why I want to control it.
I am trying to adjust the focus via the GetUserMedia api, but seems that it is not supported on my webcam(Logitech c920), here is what I get from getCapability():
aspectRatio
brightness
colorTemperature
contrast
deviceId
exposureCompensation
exposureMode
facingMode
focusMode
frameRate
groupId
height
saturation
sharpness
whiteBalanceMode
width
zoom
As you can notice, my device does not list FocusDistance or pointOfInterests as constraints, hence I can not manually set the focus.
Reference to the doc here
1) Why does FocusMode option is available? In the documentation I can only set this contraint as 'auto' or 'manual', but as I can not control the FocusDistance, seems it is useless.
2) Does it exist a list of webcam supporting these contraints?
3) As an alternative, would it be possible to set the contraint directly with Linux command line but still get the result in chrome?
Many Thanks,
Matt
javascript
google-chrome webcam asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
add a comment |
I am trying to control my webcam focus in Chrome Web browser (electron) running on Ubuntu desktop.
Basically, what I want is just to take picture of an object placed on a precise location. I need to read strings on this object and my autofocus webcam is sometimes not very good, that is why I want to control it.
I am trying to adjust the focus via the GetUserMedia api, but seems that it is not supported on my webcam(Logitech c920), here is what I get from getCapability():
aspectRatio
brightness
colorTemperature
contrast
deviceId
exposureCompensation
exposureMode
facingMode
focusMode
frameRate
groupId
height
saturation
sharpness
whiteBalanceMode
width
zoom
As you can notice, my device does not list FocusDistance or pointOfInterests as constraints, hence I can not manually set the focus.
Reference to the doc here
1) Why does FocusMode option is available? In the documentation I can only set this contraint as 'auto' or 'manual', but as I can not control the FocusDistance, seems it is useless.
2) Does it exist a list of webcam supporting these contraints?
3) As an alternative, would it be possible to set the contraint directly with Linux command line but still get the result in chrome?
Many Thanks,
Matt
javascript
google-chrome webcam asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
I am trying to control my webcam focus in Chrome Web browser (electron) running on Ubuntu desktop.
Basically, what I want is just to take picture of an object placed on a precise location. I need to read strings on this object and my autofocus webcam is sometimes not very good, that is why I want to control it.
I am trying to adjust the focus via the GetUserMedia api, but seems that it is not supported on my webcam(Logitech c920), here is what I get from getCapability():
aspectRatio
brightness
colorTemperature
contrast
deviceId
exposureCompensation
exposureMode
facingMode
focusMode
frameRate
groupId
height
saturation
sharpness
whiteBalanceMode
width
zoom
As you can notice, my device does not list FocusDistance or pointOfInterests as constraints, hence I can not manually set the focus.
Reference to the doc here
1) Why does FocusMode option is available? In the documentation I can only set this contraint as 'auto' or 'manual', but as I can not control the FocusDistance, seems it is useless.
2) Does it exist a list of webcam supporting these contraints?
3) As an alternative, would it be possible to set the contraint directly with Linux command line but still get the result in chrome?
Many Thanks,
Matt
javascript
google-chrome webcam javascript
google-chrome webcam asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
edited Jan 3 at 20:56
Matt Dillon
asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
asked Jan 3 at 16:08
Matt DillonMatt Dillon
234
234
add a comment |
add a comment |
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