[Interest] QML Camera: resulting image is rotated

[Alexander Ivash]

Thanks!

But frankly speaking this is not the answer I hoped to get :). Have you tried to extract rotation from exif / metadata? This is what I'm going to do if don't find better way. In my case VideoOutput always shows preview in correct orientation, so looks like Qt knows how to rotate preview frames properly (why doesn't it use this knowledge to rotate saved image or why doesn't it expose it - this is another question). But if Qt knows - there should be some source of information where it gets such a knowledge.
Regards, Alexander
On Dec 9 2018, at 8:17 pm, ekke <ekke at ekkes-corner.org> wrote:
>
> Am 09.12.18 um 16:57 schrieb Alexander Ivash:
> >
> > Is it possible to understand the angle to un-rotate? I've tried to un-rotate based on orientation from VideoOtput but it doesn't work uniformly on all the devices.
> > Regards, Alexander
> >
> >
> > _______________________________________________
> > Interest mailing list
> > Interest at lists.qt-project.org (https://link.getmailspring.com/link/1544403647.local-a741a368-81fb-v1.5.3-420ce003@getmailspring.com/0?redirect=mailto%3AInterest%40lists.qt-project.org&recipient=aW50ZXJlc3RAcXQtcHJvamVjdC5vcmc%3D)https://lists.qt-project.org/listinfo/interest (https://link.getmailspring.com/link/1544403647.local-a741a368-81fb-v1.5.3-420ce003@getmailspring.com/1?redirect=https%3A%2F%2Flists.qt-project.org%2Flistinfo%2Finterest&recipient=aW50ZXJlc3RAcXQtcHJvamVjdC5vcmc%3D)
> Alexander,
>
> from my experiences it's not so easy.
> it depends from device and how the camera module is physically mounted
> so I'm doing it for my customers hardcoded while waiting that QML will handle this
> here's some code from customer app
> it's on my TODO to extract the code and create example app and blog and create all the specific issues - but expect 2019
> To get some ideas:
> // V I D E O O U T P U T
> VideoOutput {
> source: camera
> anchors.fill: parent
> focus : visible
> autoOrientation: true
> rotation: isIos && isFrontFace ? 180:0
> } // Video Output
>
>
> // P R E V I E W I M A G E
> Image {
> id: photoPreview
> fillMode: Image.PreserveAspectFit
> anchors.fill: parent
> property bool isPortraitAtCaptureTime: false
> // i O S BUG
> // on iOS we don't use autoTransform - otherwise orientation would be wrong
> // instead we're calculating rotation of Image
> // we also must calculate rotation 180 for VideoOutput if iOS and FrontFace
> // see also
> // https://bugreports.qt.io/browse/QTBUG-50056 (https://link.getmailspring.com/link/1544403647.local-a741a368-81fb-v1.5.3-420ce003@getmailspring.com/2?redirect=https%3A%2F%2Fbugreports.qt.io%2Fbrowse%2FQTBUG-50056&recipient=aW50ZXJlc3RAcXQtcHJvamVjdC5vcmc%3D)
> // test also front camera bugs https://bugreports.qt.io/browse/QTBUG-37955 (https://link.getmailspring.com/link/1544403647.local-a741a368-81fb-v1.5.3-420ce003@getmailspring.com/3?redirect=https%3A%2F%2Fbugreports.qt.io%2Fbrowse%2FQTBUG-37955&recipient=aW50ZXJlc3RAcXQtcHJvamVjdC5vcmc%3D) and https://bugreports.qt.io/browse/QTBUG-67985 (https://link.getmailspring.com/link/1544403647.local-a741a368-81fb-v1.5.3-420ce003@getmailspring.com/4?redirect=https%3A%2F%2Fbugreports.qt.io%2Fbrowse%2FQTBUG-67985&recipient=aW50ZXJlc3RAcXQtcHJvamVjdC5vcmc%3D)
> autoTransform: isIos? false : true
> rotation: 0
> } // photoPreview
>
> // ROTATE BEFORE CAPTURE
> // iOS rotation calculated in cpp:
> int PhotoUtil::cameraScreenRotation(const bool isBackFace, const int cameraOrientation)
> {
> const int screenAngle = mScreen->angleBetween(mScreen->nativeOrientation(), mScreen->orientation());
> int rotation;
> if (isBackFace) {
> rotation = (360 - cameraOrientation + screenAngle) % 360;
> } else {
> rotation = (cameraOrientation - screenAngle) % 360;
> }
> return rotation;
> }
> if(isIos) {
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, photoPreview.rotation)
> } else {
> // X C O V E R
> if(isSamsungXCover) {
> if(photoPreview.isPortraitAtCaptureTime) {
> if(isBackFace) {
> // PORTRAIT BACK: rotate 90°
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, 90)
> } else {
> // PORTRAIT FRONT: rotate -90°
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, -90)
> }
> } else {
> // LANDSCAPE BACK or FRONT: rotate 180°
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, 180)
> }
> }
> // P I X E L C
> else if(isPixelC) {
> if(photoPreview.isPortraitAtCaptureTime) {
> if(isBackFace) {
> // PORTRAIT BACK: rotate 90°
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, 90)
> } else {
> // PORTRAIT FRONT: rotate -90°
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, -90)
> }
> } else {
> // LANDSCAPE BACK or FRONT: OK
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, 0)
> }
> }
> // NO SPECIAL DEVICE WITH MANAGED ORIENTATION
> else {
> photoUtil.rotateScaleSaveCapturedImage(camera.imageCapture.capturedImagePath, requestId, theEntity, 0)
> }
> }
>
>
> have tried with some devices and also created a Settings Page where customer can enter rotation needed for FrontFace or BackFace camera for a specific model, so I can add this
> ekke
> _______________________________________________
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> Interest at lists.qt-project.org
> https://lists.qt-project.org/listinfo/interest
>

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