CODEWITHSUNDEEP
androidopencvcamera
Krishna
Krishna

Reputation: 4984

How to make android camera to capture particular area inside the screen?

I want to make a android custom camera to capture particular area like card io. I want to capture the image inside the boundaries. want to show the border in the screen also.I am using opencv for this

Attached the image for reference enter image description here

Upvotes: 4

Views: 5946

Answers (1)

timegalore
timegalore

Reputation: 731

If you are using opencv then I presume you will have a callback called onCameraFrame that gives you a Mat that represents the camera frames using:

mRgba = inputFrame.rgba();

To generate the border you can simply write to mRgba before returning mRgba in the call to onCameraFrame. I do something similar here - in this case I draw a rectangle:

Core.rectangle(mRgba, new Point(w * 1 / 3, h * 1 / 3), new Point(
                w * 2 / 3, h * 2 / 3), Colours.RED);

Now if you only want the content of the rectangle then you can use submat:

 Rect roi = new Rect(new Point(w * 1 / 3 + 1, h * 1 / 3 + 1),
                new Point(w * 2 / 3, h * 2 / 3));
 Mat viewFinder = mRgba.submat(roi);

In this case viewFinder will now contain the image contained in the rectangle.

I hope that answers the question but come back to me if you need any more info.

Upvotes: 2

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