如何使用Camera.takePicture你把高分辨率的图像（）？ [英] How do you take high resolution images using Camera.takePicture()?

问题描述

我实现应用程序内的摄像头和我每次拍照我的形象是320×240，虽然我的手机的摄像头能够更高的分辨率（Galaxy Nexus的）。我无法找到设置分辨率的参数，所以我怎么了图片，我采取的分辨率是多少？以下是有关code：

  @覆盖
公共无效surfaceCreated（SurfaceHolder持有者）{

    setSurfaceHolder（保持器）;
}

@覆盖
公共无效surfaceDestroyed（SurfaceHolder持有者）{

    setSurfaceHolder（空）;
}

私人无效attachCameraToSurface（摄像头摄像头，SurfaceHolder持有人）{

    尝试 {
        camera.set previewDisplay（保持器）;
        瑟酮preVIEW（真正的）;
    }
    赶上（IOException异常E）{
        Log.e（CameraFragment，异常的attachCameraToSurface（），E）;
    }
}

@覆盖
公共无效surfaceChanged（SurfaceHolder持有人，INT格式，诠释的宽度，高度INT）{

    摄像头摄像头= getCamera的（）;
    如果（相机== NULL）{
        返回;
    }

    Camera.Size大小= getCamera的previewSize（摄像头）;
    Camera.Parameters PARAMS = camera.getParameters（）;
    params.set previewSize（size.width，size.height）;
    camera.setParameters（PARAMS）;

    attachCameraToSurface（摄像头，支架）;

    启动preVIEW（）;
}

私人Camera.Size getCamera的previewSize（摄像机镜头）{

    Camera.Parameters PARAMS = camera.getParameters（）;
    名单＆LT; Camera.Size＆GT; supportedSizes = params.getSupported previewSizes（）;

    矩形框= getSurfaceHolder（）getSurfaceFrame（）。
    INT宽度= frame.width（）;
    INT高= frame.height（）;

    对于（Camera.Size大小：supportedSizes）{
        如果（size.width＆GT; =宽度|| size.height＆GT; =身高）{
            返回的大小;
        }
    }

    返回supportedSizes.get（0）;
}

@覆盖
公共无效的onClick（视图v）{

    开关（v.getId（））{
        案例R.id.camera_action_ImageView：
            。getCamera的（）takePicture（getShutterCallback（），空，新JpegPictureCallback（））;
        打破;
    }
}

私有类JpegPictureCallback实现PictureCallback {

    @覆盖
    公共无效onPictureTaken（byte []的数据，摄像头摄像头）{

        点阵位图= NULL;
        尝试 {
            位= BitmapFactory.de codeByteArray（数据，0，data.length）;
        }
        赶上（OutOfMemoryError异常E）{
            Log.e（CameraFragment，内存不足从相机图像解码，E）;
            返回;
        }
        数据= NULL;

        如果（位图！= NULL）{
            新SavePictureWorker（getActivity（））.execute（位图）;
        }

        启动preVIEW（）;
    }
}
 

解决方案

使用 params.setPictureSize（）。请参阅 Camera.Parameters 了解更多信息。

请确保你调用 params.getSupportedPictureSizes（）第一个获得支持的图片大小的数组。然后从列表中选择一个的大小和使用setPictureSize（）方法来设置所需的大小。

  Camera.Parameters PARAMS = camera.getParameters（）;
名单＆LT; Camera.Size＆GT; supportedSizes = params.getSupportedPictureSizes（）;
。
。
Camera.Size sizePicture =（从supportedSizes列表尺寸之一）;
。
params.setPictureSize（sizePicture.width，sizePicture.height）;
 

I'm implementing an in-app camera and every time I take a picture my image is 320x240, though my phone's camera is capable of much higher resolutions (Galaxy Nexus). I couldn't find a parameter for setting the resolution, so how do I up the resolution of images I am taking? Here's the relevant code:

@Override
public void surfaceCreated( SurfaceHolder holder ) {

    setSurfaceHolder( holder );
}

@Override
public void surfaceDestroyed( SurfaceHolder holder ) {

    setSurfaceHolder( null );
}

private void attachCameraToSurface( Camera camera, SurfaceHolder holder ) {

    try {
        camera.setPreviewDisplay( holder );
        setInPreview( true );
    }
    catch (IOException e) {
        Log.e( "CameraFragment", "Exception in attachCameraToSurface()", e );
    }
}

@Override
public void surfaceChanged( SurfaceHolder holder, int format, int width, int height ) {

    Camera camera = getCamera();
    if ( camera == null ) {
        return;
    }

    Camera.Size size = getCameraPreviewSize( camera );
    Camera.Parameters params = camera.getParameters();
    params.setPreviewSize( size.width, size.height );
    camera.setParameters( params );

    attachCameraToSurface( camera, holder );

    startPreview();
}

private Camera.Size getCameraPreviewSize( Camera camera ) {

    Camera.Parameters params = camera.getParameters();
    List<Camera.Size> supportedSizes = params.getSupportedPreviewSizes();

    Rect frame = getSurfaceHolder().getSurfaceFrame();
    int width = frame.width();
    int height = frame.height();

    for (Camera.Size size : supportedSizes) {
        if ( size.width >= width || size.height >= height ) {
            return size;
        }
    }

    return supportedSizes.get( 0 );
}

@Override
public void onClick( View v ) {

    switch (v.getId()) {
        case R.id.camera_action_ImageView:
            getCamera().takePicture( getShutterCallback(), null, new JpegPictureCallback() );
        break;
    }
}

private class JpegPictureCallback implements PictureCallback {

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

        Bitmap bitmap = null;
        try {
            bitmap = BitmapFactory.decodeByteArray( data, 0, data.length );
        }
        catch (OutOfMemoryError e) {
            Log.e( "CameraFragment", "Out of memory decoding image from camera.", e );
            return;
        }
        data = null;

        if ( bitmap != null ) {
            new SavePictureWorker( getActivity() ).execute( bitmap );
        }

        startPreview();
    }
}

解决方案

Use params.setPictureSize(). See Camera.Parameters for more information.

Ensure that you call params.getSupportedPictureSizes() first to get an array of supported picture sizes. Then choose a size from the list and use the setPictureSize() method to set the desired size.

Camera.Parameters params = camera.getParameters();
List<Camera.Size> supportedSizes = params.getSupportedPictureSizes();
.
.
Camera.Size sizePicture = (one of the sizes from supportedSizes list);
.
params.setPictureSize(sizePicture.width, sizePicture.height);

这篇关于如何使用Camera.takePicture你把高分辨率的图像（）？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！