Opencv android，捕获图像 [英] Opencv android, capture image

问题描述

我将尝试简化我的问题.可以说我只是想用相机看到灰度图像，我这样做是这样的:

I will try to simplify my problem. Lets say i just want to see grayscale images using camera, i do it this way:

public Mat onCameraFrame(CvCameraViewFrame inputFrame) {

return inputFrame.gray();

 }

这很好用，现在我可以在屏幕上看到灰色的图像了.但是问题是当我尝试捕获此图像(帧)时.它不是用灰色捕获它，而是用彩色捕获它(它忽略了我在onCameraFrame中所做的所有效果).要捕获图像，我使用与教程3-相机控制相同的方法(此处是相关代码):

And this works just fine, i can now dinamically see grey image on my screen. But problem is when i try to capture this image (frame). Instead of capturing it in grey, it captures it in color (it ignores all the effects i do in onCameraFrame). To capture image i use the same way done in Tutorial 3 - Camera Control (Here is relevant code):

public class MainActivity extends Activity implements CvCameraViewListener2, View.OnTouchListener {

private CameraLab mOpenCvCameraView;

protected void onCreate(Bundle savedInstanceState) {

     mOpenCvCameraView = (CameraLab) findViewById(R.id.openCVCamera);
        mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
        mOpenCvCameraView.setCvCameraViewListener(this);
}

@Override
    public boolean onTouch(View v, MotionEvent event) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss");
        String currentDateandTime = sdf.format(new Date());
        String fileName = "Image_"+currentDateandTime + ".jpg";
        mOpenCvCameraView.takePicture(fileName);
        return false;
    }
}


public class CameraLab extends JavaCameraView implements PictureCallback {

private String mPictureFileName;

public void takePicture(final String fileName) {
        Log.i(TAG, "Taking picture");

        this.mPictureFileName = fileName;

        mCamera.setPreviewCallback(null);

        // PictureCallback is implemented by the current class
        mCamera.takePicture(null, null, this);
    }

    @Override
    public void onPictureTaken(byte[] data, Camera camera) {

        Log.i(TAG, "Saving a bitmap to file");
        mCamera.startPreview();
        mCamera.setPreviewCallback(this);

        // Write the image in a file (in jpeg format)
       try {
            FileOutputStream fos = new FileOutputStream(mPictureFileName);

            fos.write(data);
            fos.close();

        } catch (java.io.IOException e) {
            Log.e("PictureDemo", "Exception in photoCallback", e);
        }

    }
}

因此，回顾一下，问题是当我捕获图像时我在onCameraFrame上所做的一切(使图像变灰，检测圆圈...)，但我没有得到任何这些效果，我只是得到了正常图像.

So, to recap, problem is whatever i do in onCameraFrame (make image grey, detect circles...) when i capture image i dont get any of those effects, i just get a normal image.

我该如何解决?

推荐答案

这是超级骗子，但我在搜索时看到了很多次.我通过使用

This is super duper old but I saw it so many times while searching. I solved my issue by using

Imgcodecs.imwrite(fileName,mRgba);

代替

javaCameraView.takePicture(fileName);

在我的onTouch方法中.

in my onTouch method.

这篇关于Opencv android，捕获图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！