FacialRecognitionFragment.java 文件源码

/**
 * lazily initialize ImageReader and select preview size
 */
private void setupPreviewSizeAndImageReader() {
    if (previewSize == null) {
        previewSize = cameraHelper.selectPreviewSize(openCamera);
    }

    if (imageReader == null) {
        int maxImages = 2;  // should be at least 2 according to ImageReader.acquireLatestImage() documentation
        imageReader = ImageReader.newInstance(previewSize.getWidth(), previewSize.getHeight(), ImageFormat.YUV_420_888, maxImages);
        imageReader.setOnImageAvailableListener(new ImageReader.OnImageAvailableListener() {
            @Override
            public void onImageAvailable(ImageReader reader) {
                Image img = reader.acquireLatestImage();
                if (img != null) {

                    // Make a in memory copy of the image to close the image from the reader as soon as possible.
                    // This helps the thread running the preview staying up to date.
                    IntensityPlane imgCopy = IntensityPlane.extract(img);
                    img.close();

                    int imageRotation = cameraHelper.getImageRotation(openCamera, getRelativeDisplayRotation());

                    presenter.onImageCaptured(imgCopy, imageRotation);
                }
            }
        }, null);
    }
}