I’m pretty new to swift (SwiftUI) and making a easy face and card detection app utilizing Imaginative and prescient. Mainly it’s only a digicam preview layer and upon face/card detection, it crops the picture and shows it on the view. I’m having some issues understanding how picture orientation works.
That is my understanding, right me if I’m unsuitable:
In iOS gadgets, after we maintain the digicam in portrait orientation, the native sensor nonetheless captures the picture in panorama left (so we have now to rotate the picture 90 deg proper for meant orientation) for the again digicam. For entrance digicam, it nonetheless captures in panorama left however moreover it’s mirrored too.
Suppose this pattern picture from internet
I attempted two approaches:
I-) Within the VNImageRequestHandler, I set the orientation to .proper so the captured buffers would rotate to proper however they didn’t. I believed this is able to work.
II-) Within the digicam configuration, I set the videoOrientation to AVCaptureVideoOrientation.portrait, this corrected the seize orientation of the buffers.
Now acc to my understanding, if I set the orientation to .up(default) in VNImageRequestHandler, it ought to work proper? The captured buffer was in right orientation however the crop was not making use of accurately.
However once I set the orientation to .downMirrored in request handler, it labored accurately, the buffers have been in right orientation and the crop was good too.
Why does .downMirrored (the wrong way up and horizontal flip) work and never the Ist strategy?
