B4A Library [Class] CameraEx - Extends the camera library functionality

Erel · Nov 28, 2012

Example based on B4XPages: https://www.b4x.com/android/forum/threads/b4x-b4xpages-barcode-reader.120417/#content

CameraEx class wraps the Camera object and using reflection and other code it extends its functionality.

CameraEx class requires Android 2.3+ and depends on Camera library v2.20+
CameraEx features:

Easily open the back or front camera
Preview images and saved images orientation will match the device orientation (all orientations are supported)
Gives access to Camera.Parameters native class (flashmode, picture size, effects and other settings)
Includes methods to convert preview images to JPEG and to save the taken pictures.
It should be simple to add more methods to this class

See this page for the constant values and other possible methods:
https://developer.android.com/reference/android/hardware/Camera.Parameters.html

Note that you should call CommitParameters after changing one or more parameters.

CameraExClass module is included in the attached example.

V1.30 is attached - Includes various new methods.

v1.20 - Includes all the various posts in this thread as well as AutoFocusAndTakePicture method which first calls AutoFocus and then takes a picture (if AutoFocus was successful).

Edit (06/2018): A new version was uploaded with targetSdkVersion set to 26.

Erel · Mar 31, 2014

Erel's example is for Portrait mode.

That's not true. This example works in both orientations.

About the Google Glass issue, see this thread: http://stackoverflow.com/questions/...preview-image-scrambled-with-new-xe10-release

It is a bug in these devices.
The workaround is to set the preview FPS setting.

Shadow&Max · Mar 31, 2014

Erel... All I was saying is that in his image, you can see just the top of the picture size button at the bottom of his image...

This is because his "view" is long and short... the button for picture size in your example is too low to show on his device... Your example, while fine for most rectangular formats in portrait or landscape, has too many buttons vertically to show on his shorter screen.

GMan · Mar 31, 2014

i think, the Glass res & ratio is equal to a 16:9 format - and that cant be handled by the "normal" classes and libs 'cause they are developed for another ratio (for smartphones).
MAYBE some time there will be 16:9 smartphones (thinking about how that should look like)

Erel · Mar 31, 2014

i think, the Glass res & ratio is equal to a 16:9 format - and that cant be handled by the "normal" classes and libs 'cause they are developed for another ratio (for smartphones).

No. The camera library is based on the only API in Android. It can support any screen ratio.

This is a known issue in Google Glass: https://code.google.com/p/google-glass-api/issues/detail?id=232

Alberto Iglesias · Mar 31, 2014

Erel,

How can I put this parameters in CameraEX:

params.setPreviewFpsRange(30000, 30000);
params.setPreviewSize(640,360);
camEx.SetParameter(params);

??

I will try in my glass right now

Erel · Apr 1, 2014

Add these two lines to Camera1_Ready (before camEx.CommitParameters):

B4X:

camEx.SetPreviewFpsRange(30000, 30000)
camEx.SetPreviewSize(640, 360)

Alberto Iglesias · Apr 1, 2014

But in this class don´t have this properties
Can I still with a older version?

Erel · Apr 1, 2014

I see. You can find them here: http://www.b4x.com/android/forum/th...ra-preview-process-lighter.28936/#post-167896

Alberto Iglesias · Apr 1, 2014

Erel, WORKS!!! look in glass

Erel · Apr 2, 2014

Nice! The image was taken from the glass? Your app adds the overlay?

Alberto Iglesias · Apr 2, 2014

Yes...

I share with everybody this project....

Works very well with Google Glass, my Samsung Galaxy Tab 7, my Smartwach.

The APP is in Google Play in https://play.google.com/store/apps/details?id=com.visualnet.glasscolor

victormedranop · Apr 2, 2014

One Question. How can i reduce the size of the view of the área i am trying to shoot?

thanks,

Erel · Apr 3, 2014

Try to change the zoom level:

B4X:

Public Sub IsZoomSupported As Boolean
  r.target = parameters
  Return r.RunMethod("isZoomSupported")
End Sub
Public Sub GetMaxZoom As Int
  r.target = parameters
  Return r.RunMethod("getMaxZoom")
End Sub

Public Sub getZoom() As Int
  r.target = parameters
  Return r.RunMethod("getZoom")
End Sub
Public Sub setZoom(ZoomValue As Int)
  r.target = parameters
  r.RunMethod2("setZoom", ZoomValue, "java.lang.int")
End Sub

http://www.b4x.com/android/forum/th...ex-class-zoom-function-to-work.35829/#content

tuhatinhvn · Apr 7, 2014

can you add faceDetection?

Erel · Apr 7, 2014

Yes: http://www.b4x.com/android/forum/th...listener-callback-from-b4a.37963/#post-224514

RAJAN MBA · Apr 12, 2014

Alberto Iglesias said:
Yes...

I share with everybody this project....

Works very well with Google Glass, my Samsung Galaxy Tab 7, my Smartwach.

The APP is in Google Play in https://play.google.com/store/apps/details?id=com.visualnet.glasscolor

This may give inaccurate colors in low light. Is there a way to check if light is low and warn the user? How many colors database are you using (may be 500?)? I was wondering if the colors database could be stored locally in SQlite and used without sacrificing retrieval speed.

Alberto Iglesias · Apr 12, 2014

Yes, I work in a new version to put the database inside a project, not in internet.

and the check if light is low, yes, can be, look the google glass sensors:
The following sensors are supported on Glass:

The following sensors are not supported:

And the quantity of colors is 751, look the attachment

RAJAN MBA · Apr 12, 2014

Alberto Iglesias said:
Yes, I work in a new version to put the database inside a project, not in internet.

and the check if light is low, yes, can be, look the google glass sensors:
The following sensors are supported on Glass:

TYPE_ACCELEROMETER

TYPE_GRAVITY

TYPE_GYROSCOPE

TYPE_LIGHT

TYPE_LINEAR_ACCELERATION

TYPE_MAGNETIC_FIELD

TYPE_ORIENTATION (deprecated)

TYPE_ROTATION_VECTOR

The following sensors are not supported:

TYPE_AMBIENT_TEMPERATURE

TYPE_PRESSURE

TYPE_PROXIMITY

TYPE_RELATIVE_HUMIDITY

TYPE_TEMPERATURE

And the quantity of colors is 751, look the attachment

Thank you for the links. I will study them

Shadow&Max · Apr 16, 2014

Hi Erel...

I'm using this class, but I've got an issue... the flash and the switch camera work fine in Release mode, but don't work at all in Release (Obfuscated).

Any idea why?

Erel · Apr 17, 2014

Does it happen with the example code as well?

See the "pitfalls" section here: http://www.b4x.com/android/forum/threads/android-code-obfuscation.13773/#content

B4A Library [Class] CameraEx - Extends the camera library functionality

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