Using getOptimalPreviewSize() is important, but it does not resolve all stretching on all devices in all layouts. You must be prepared to crop the preview a little bit so that the preview fills the screen without distortion. There are different techniques to force the size of the surface different from the actual screen size, but … Read more
If you want to get the image back in its full glory, pass in a uri to the Intent within the EXTRA_OUTPUT extra. If you’re fine with a smallish bitmap (and you should be), just call the intent as normal. Now you have two options, deal with the uri of the image that is returned … Read more
Solution First, update the photoPickerIntent to use ACTION_GET_CONTENT, and remove the extras related to cropping, since cropping will be handled by another Intent later: Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT); photoPickerIntent.setType(“image/*”); // Do not include the extras related to cropping here; // this Intent is for selecting the image only. startActivityForResult(photoPickerIntent, RESULT_LOAD_IMAGE); Then, onActivityResult() will have … Read more
Looks like we can call the camera using a proper GStreamer pipeline like below: VideoCapture cap(“mfw_v4lsrc ! ffmpegcolorspace ! video/x-raw-rgb ! appsink”) as the camera output is in YUV, we need to convert that to RGB to pass the frames to OpenCV. This is where OpenCV makes sure it gets RGB colorspace.
If you want to use a front-facing camera for barcode scanning you can use TextureView and apply a transformation matrix to it. When the texture is updated you can read the image data and use that. See https://github.com/hadders/camera-reverse Specifically from MainActivity.java mCamera.setDisplayOrientation(90); Matrix matrix = new Matrix(); matrix.setScale(-1, 1); matrix.postTranslate(width, 0); mTextureView.setTransform(matrix);
I found a fix (not my work) that makes it work for Samsung devices. The blog with explanation can be found here. However, using this fix on non-Samsung phones returns the wrong image, so I would use an if(imageURI != null) { // do it the normal way else { // do it the “Samsung” … Read more
The android (at least mine) has 2 camera parameters “rawsave-mode” and “rawfname”, with the default rawsave-mode=0. By setting rawsave-mode=1, the camera will save the raw camera image file, along with performing the other camera functions as usual. Camera.Parameters parameters=preview.camera.getParameters(); parameters.set(“rawsave-mode”, “1”); parameters.set(“rawfname”, “/mnt/sdcard/test.raw”); preview.camera.setParameters(parameters); preview.camera.takePicture(shutterCallback, null, jpegCallback); The actual name of the file produced get … Read more
I modified the CameraSourcePreview (….) constructor to be as follows: public CameraSourcePreview(Context context, AttributeSet attrs) { super(context, attrs); mContext = context; mStartRequested = false; mSurfaceAvailable = false; mSurfaceView = new SurfaceView(context); mSurfaceView.getHolder().addCallback(new SurfaceCallback()); addView(mSurfaceView); mSurfaceView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { cameraFocus(mCameraSource, Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO); } }); } private static boolean cameraFocus(@NonNull CameraSource cameraSource, @NonNull … Read more
You aren’t doing anything wrong. In fact, you are doing everything correct. You are encountering a Device-Specific issue that is very prevalent in the Android world. I have found the following behavioral patterns for FLASH_MODE_TORCH: Works fine in all cases Works fine, but not with autofocus on Doesn’t work at all Frustratingly, getSupportedFlashModes() will return … Read more
How to capture an image using the AVFoundation front-facing camera: Development Caveats: Check your app and image orientation settings carefully AVFoundation and its associated frameworks are nasty behemoths and very difficult to understand/implement. I’ve made my code as lean as possible, but please check out this excellent tutorial for a better explanation (website not available … Read more