QCameraImageCapture get QImage without saving

[luca]

Hi all,
I'm on N9.
I can show camera in a viewfinder.

Now I need to get a QImage from camera to manipulate it without saving a file in my phone.

is It possible?

[minimoog77]

Maybe this will help http://harmattan-dev.nokia.com/docs/library/html/fcam/main.html?tab=1

[luca]

Thanks,
I try to explain me better.
In my application I need to get a QImage from phone camera.
This is my code:
@
{
...
...
m_camera = new QCamera("primary");
m_camera->setViewfinder(ui->viewFinder);
m_imageCapture = new QCameraImageCapture(m_camera);
QImageEncoderSettings encoder_setting = m_imageCapture->encodingSettings();
encoder_setting.setCodec("image/jpeg");
encoder_setting.setQuality(QtMultimediaKit::NormalQuality);
encoder_setting.setResolution(800,600);
m_imageCapture->setEncodingSettings(encoder_setting);
connect(m_imageCapture, SIGNAL(imageSaved(int,QString)), this, SLOT(processSavedImage(int,QString)));
...
m_imageCapture->capture();
....
}

void MainWindow::processSavedImage(int requestId, QString str)
{
QImage my_image(str);
...
}
@

This way I get a QImage reading it from phone memory while I'd like to get the QImage without saving to disk before.

[luca]

I have the same problem using QML and Camera Element.

When I call Camera.captureImage() it capture a jpg image and save it.

Is there a way to avoid to save the image?
If not, is there a way to specify a path of the saved image?

[puksec]

Hi, I had this problem a while ago. This is my fix:

@void init_WebCam()
{
cam = new QCamera(0);
connect(&captureTimer, SIGNAL(timeout()),
this, SLOT (frameUpdated()));
videoWidget = new QVideoWidget();
videoWidget->setFixedSize(640,480);
cam->setViewfinder(videoWidget);
}

void MainWindow::frameUpdated()
{
videoWidget->grab().toImage(); // this is your QImage
}@

Note that this is not QML, but c++ gui.

[leon.anavi]

[quote author="puksec" date="1378901986"]Hi, I had this problem a while ago. This is my fix:[/quote]

Thank you for sharing this solution but please wrap the source code with @ to make it easier for reading.

[puksec]

Hm "@". So that's how you all are doing it :). Thanks for the tip.

[ylopes]

QCameraImageCapture::setCaptureDestination(QCameraImageCapture::CaptureToBuffer) is what you need.

Then listen to the QCameraImageCapture::imageAvailable() signal to get notified whenever the buffer is available.
You'll notice that what you get is a QVideoFrame, and you'll have to convert it to a QImage if that's what you need.

[puksec]

I agree that that would be the first choice, but I had a situation where QCameraImageCapture::CaptureToBuffer was not supported on my system (for some unknown reason).

[cnc-bert]

Hi, I am having similar problem and I am quit new to qt programing.
Do you have an example of how to use the CaputureToBuffer ?
I do not know how to listen to QCameraImageCapture::imageAvailable() signal.
Thanks.

[quote author="Yoann Lopes" date="1383734227"]QCameraImageCapture::setCaptureDestination(QCameraImageCapture::CaptureToBuffer) is what you need.

Then listen to the QCameraImageCapture::imageAvailable() signal to get notified whenever the buffer is available.
You'll notice that what you get is a QVideoFrame, and you'll have to convert it to a QImage if that's what you need.[/quote]