Question

在Android上使用Camera 2 API

对于实时图像处理，我设置了一个监听器来进行一些图像处理，给出一个关于是否捕获图像的布尔输出。目前，我在点击按钮时使用的camera2Raw示例中包含takePicture()。如何确保捕获我处理的相同帧并且不捕获其他帧。请帮帮我。感谢

Link to camera2Raw

Answer 1

当你在captureSession中进行捕获时，当前帧将被捕获并通过onCapturePictureComplete（）方法从当前回调关联到你的捕获：

  mCaptureSession.capture(mPhotoRequestBuilder.build(), YourCallback, null);

private CameraCaptureSession.CaptureCallback YourCallback = new CameraCaptureSession.CaptureCallback() {

    @Override
    public void onCaptureCompleted(@NonNull CameraCaptureSession session,
                                   @NonNull CaptureRequest request,
                                   @NonNull TotalCaptureResult result) {

        //get the iso and time exposure from the picture
        Integer iso = result.get(CaptureResult.SENSOR_SENSITIVITY);
        long timeExposure = result.get(CaptureResult.SENSOR_EXPOSURE_TIME);

        Log.i(TAG, "[mHdrCaptureCallback][HDR] Photo: " + mHdrIndex + " Exposure: " + timeExposure);
        Log.i(TAG, "[mHdrCaptureCallback][HDR] Photo: " + mHdrIndex  + " ISO " + iso);

    }
};

在上面的示例中，我进行了捕获，当它完成时，Capture回调就是调用。我只是从图像结果打印曝光和ISO的值。但是，当您拍摄照片时，也会调用当前ImageReader中的onImageAvailable Listener，并且您将拥有当前帧和图像以保存它。

在Google中查看您的示例：

/**
 * This a callback object for the {@link ImageReader}. "onImageAvailable" will be called when a
 * JPEG image is ready to be saved.
 */
private final ImageReader.OnImageAvailableListener mOnJpegImageAvailableListener
        = new ImageReader.OnImageAvailableListener() {

    @Override
    public void onImageAvailable(ImageReader reader) {
        dequeueAndSaveImage(mJpegResultQueue, mJpegImageReader);
    }

};

/**
 * This a callback object for the {@link ImageReader}. "onImageAvailable" will be called when a
 * RAW image is ready to be saved.
 */
private final ImageReader.OnImageAvailableListener mOnRawImageAvailableListener
        = new ImageReader.OnImageAvailableListener() {

    @Override
    public void onImageAvailable(ImageReader reader) {
        dequeueAndSaveImage(mRawResultQueue, mRawImageReader);
    }

};

希望它能帮到你，现在你知道保存图像处理如何更好地使用camera2，请告诉我是否可以帮助你做其他事情！

camera2api自动捕获当前预览帧

1 个答案: