Any camera component with image frames?
lazarus / 43-Android

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Michael Collier · 2022-03-16 15:22

I'd like to turn on the phone camera and grab each frame (i.e. 10
frames per second), maybe from some kind of callback event from the
camera.

Ideally I could then copy the frame data to a bitmap so I can process
it, does anything like this exist already?

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Thaddy · 2022-03-16 15:35

libvlc - supported by Freepascal - can do that, but it is complex.
AFAIK there are no easy solutions. And no: no components.
I will see if I can come up with the least complex example. That will
not be today or next week, though....

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jmpessoa · 2022-03-16 16:51

Hi, Michael!

Can you provide any java/android example/link ?

If yes then I can try to build a LAMW wrapper component....

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loaded · 2022-03-16 17:03

Can't the sample be modified for this job?
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
...\lazandroidmodulewizard-master\demos\GUI\AppCustomCameraDemo1

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Michael Collier · 2022-03-17 09:02

Quote from: loaded on March 16, 2022, 06:03:59 pmCan't the sample be
modified for this job?
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
...\lazandroidmodulewizard-master\demos\GUI\AppCustomCameraDemo1
Possibly, thanks.. I tried to get image out of the jCustomCamera1
component and into a jImageView1 that I placed on the form. But
nothing worked for me, and worse case the app crashed. Any help on the
appropriate function calls would be great ( I used things like
ImageView1.SetImage() and jCustomCamera1.GetImage() )..

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loaded · 2022-03-17 10:42

I think you can do what you want by examining other camera samples.
(\AppCameraDemo or AppCameraDemo2)
By the way, I would like to share an experience that came to my mind
on the subject;
A few years ago, I went to the field and wrote an application to take
pictures of the buildings and parcels requested from me with
coordinates from my mobile phone, save them in the database and
associate them with the parcels on which they are located.
I wanted to do this work with LAMW first, but I had serious problems
with resolution and stability. In addition to these, I had to write
the project entirely on Eclips when I had different problems on
different phones in the team.
Maybe it was because of my incompetence. I am not sure.
If you want, you can download and test the related camera application
from the play store.
https://play.google.com/store/apps/details?id=com.cadplugin.fotoemlak&
hl=tr&gl=US

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Michael Collier · 2022-03-17 12:30

On my system AppCameraDemo crashes the IDE and AppCameraDemo2 doesn't
update the image as it is meant to (I guess). But I copied the source
code over to my own test project and tried with jView and jCanvas
components but remains blank.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  
jView1.Canvas.DrawBitmap  (    jCustomCamera1.GetImage    (     
jView1.Width    , jView1.Height    )  , jView1.Width  , jView1.Height 
) ;   
I think the issue is that jCustomCamera1.GetImage isn't returning any
image data?

I can write text to the canvas as per demo, so I'm pretty certain my
components are configured correctly..

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
jView1.Canvas.drawText('Hello People!', 30, 30);
I don't think the camera component / TakePhoto option is any good for
me as I need to grab frames at 10FPS, or maybe even 30FPS later.

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Michael Collier · 2022-03-18 06:37

Quote from: jmpessoa on March 16, 2022, 05:51:54 pmCan you provide any
java/android example/link ?

Maybe this might help?
https://developer.android.com/reference/android/hardware/Camera.Previe
wCallback

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Michael Collier · 2022-03-18 06:40

And this old example kind of explains what I'm already partly doing in
a different set of dev tools.
https://github.com/fyhertz/libstreaming