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face-detect with portrait mode and front-camera

asked 2013-11-14 21:17:03 -0600

Zeo gravatar image

I tried to make my own face detect app on Android. The app should be used in portrait display, using front-camera. Firstly, I made it like below:

image description

knowing that I have to rotate the view or the camera, I looked for help in this forum and found the method "mCamera.setDisplayOriention(90)" cannot make sense in Opencv sample's struction. Then I got my way in link text .The result came out like below:

image description

I had successfully added the face-detection by studying the sample. But I want some improvement because the black border is ugly.

Seeking for advise here.

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The link which you mentioned above id not working... please give me a link i am struggling for one week

Face detection gravatar imageFace detection ( 2014-10-22 05:02:49 -0600 )edit

Hi sir, Because I have the same problems, could you give me a big hands or how can i get link text. many thanks!

Ming-Lang Tai gravatar imageMing-Lang Tai ( 2014-11-29 21:43:05 -0600 )edit

Hello! Could u share again the link? it doesn't work:( I have the same problem...Have u solved the problem of the black border?

diegokrk gravatar imagediegokrk ( 2015-07-22 18:23:08 -0600 )edit

Hello! Could you share the link again ? it doesn't work:( I have the same problem...Have you solved the problem of the black border?

diegokrk gravatar imagediegokrk ( 2015-07-22 18:23:37 -0600 )edit

Hi @Zeo and @diegokrk can you please share with us the code to make the rotation of the image to be in portrait mode?? The thing with the black border seems to be a selection of wrong preview size Can you paste the link for the source code on send it to my email [email protected]? Thanks

David C gravatar imageDavid C ( 2017-11-04 12:56:22 -0600 )edit
supra56 gravatar imagesupra56 ( 2017-11-04 15:23:03 -0600 )edit

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answered 2018-04-25 09:25:43 -0600

In your public Mat onCameraFrame(CvCameraViewFrame inputFrame) { }

Add following lines:

    Mat rotImage = Imgproc.getRotationMatrix2D(new Point(mRgba.cols() / 2,
            mRgba.rows() / 2), 90, 1.0);

    Imgproc.warpAffine(mRgba, mRgba, rotImage, mRgba.size());

    Imgproc.warpAffine(mGray, mGray, rotImage, mRgba.size());

Then set your activity to portrait in manifest

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Asked: 2013-11-14 21:17:03 -0600

Seen: 2,628 times

Last updated: Nov 04 '17