Image Orientation in ActionSnap

billynyh 2011-10-24

Transcript

1. Image Orientation in ActionSnap
2. Camera Support API 7 • Fixed app orientation • No orientation related method, must call camera in landscape mode
3. OrientationEventListener • Helper class for receiving notifications from the SensorManager when the orientation of the device has changed. • call onOrientationChanged(int) when the device orientation changes. • return degree 0-359 • (deg >= 225 && deg <= 315) considered as portrait photo
4. OrientationEventListener 0 degree 270 degree
5. Galaxy Tab 0 degree 0 degree
6. Display http://developer.android.com/reference/android/view/Display.html • Provides information about the display size and density. • getOrientation() - API 7 (deprecated) • getRotation() - API 8 • Returns the rotation of the screen from its "natural" orientation. • For example, if a device has a naturally tall screen, and the user has turned it on its side to go into a landscape orientation, the value returned here may be either Surface. ROTATION_90 or Surface.ROTATION_270 depending on the direction it was turned.
7. Combine sensor and display orientation (in landscape mode) if displayOrientation == 0 // device with landscape orientation - Galaxy Tab 10.1 (deg >= 45 && deg <= 135) considered as portrait photo else // normal phone (deg >= 225 && deg <= 315) considered as portrait photo
8. Front camera preview display of front-facing cameras is flipped horizontally before the rotation. Landscape image - no problem Portrait image - ?
9. what you see on the screen result image
10. preview result
11. Solution • special handle front camera
12. Front camera of Galaxy Tab 7 • android 2.2 • no front camera API • no information about number of cameras • current solution: hard code device model • done?
13. preview orientation != screen orientation solution: hard code for galaxy tab 7
14. Conclusion dont support all device