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OpenCV 2.4.5 front camera preview is upside down?!

asked 2013-04-23 04:36:54 -0500

s4eed gravatar image

I tried to use my device front camera with this code :

<org.opencv.android.JavaCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/tutorial1_activity_java_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="front" />

It worked but the preview is upside down! How to fix it? I use OpenCV 2.4.5.
Here is my user interface file :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:opencv="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="match_parent" >

    <org.opencv.android.JavaCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/tutorial1_activity_java_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="front" />

    <org.opencv.android.NativeCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/tutorial1_activity_native_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="front" />

</LinearLayout>

Both of native camera and java camera have this problem.

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2 answers

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answered 2014-10-11 19:11:02 -0500

spiritinlife gravatar image

Hello in case you are still wondering the flip function that is suggested by the other topics for android is : Core.flip(aInputFrame,aInputFrame,1); //1 is for y-axis

You should put this in the first line of the -> public Mat onCameraFrame(Mat aInputFrame) <-function , to achieve the desired effect.

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My method signature is not same as yours. Mine is public Mat onCameraFrame(CvCameraViewFrame inputFrame). Any idea, please?

song_cr gravatar imagesong_cr ( 2018-04-25 09:04:21 -0500 )edit
1

answered 2013-04-23 09:20:15 -0500

Simply said, this problems has already been answered in this topic.

Next time please use the search button. More tips on how to use this forum can be found here.

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Hi.

The other topic you mention concerns the same issue, but in iOS.

How would it apply to Android phones? I can't say I understand where and what change to make, sorry.

BR, Luís

Luis gravatar imageLuis ( 2013-07-17 13:26:08 -0500 )edit

Use the flip function on the incomming data, it is because of difference between both coördinate systems. Be sure to flip around the correct horizontal axis :)

StevenPuttemans gravatar imageStevenPuttemans ( 2013-07-17 13:59:07 -0500 )edit
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Asked: 2013-04-23 04:36:54 -0500

Seen: 5,499 times

Last updated: Oct 11 '14