Rotate camera preview to Portrait Android OpenCV Camera

Question

I am trying to use OpenCV 2.4.3.2 to create a camera app and do some opencv processing. I would like it to be able to have multiple UI orientations, not just Landscape.

Answer 1

Actually, you can just make width or height match parent (full screen).

if (canvas != null) {
        Bitmap bitmap = Bitmap.createScaledBitmap(mCacheBitmap, canvas.getHeight(), canvas.getWidth(), true);
        canvas.rotate(90,0,0);
        float scale = canvas.getWidth() / (float)bitmap.getHeight();
        float scale2 = canvas.getHeight() / (float)bitmap.getWidth();
        if(scale2 > scale){
            scale = scale2;
        }
        if (scale != 0) {
            canvas.scale(scale, scale,0,0);
        }
        canvas.drawBitmap(bitmap, 0, -bitmap.getHeight(), null);

...

Also, you can make the preview size larger than the screen. Just modify the scale.