人脸跟踪器摄像头Source Android:如何提高前置摄像头的质量?
人脸跟踪器应用程序基于。默认情况下,面部跟踪器使用后/后摄像头,但我希望使用前摄像头检测面部 这是google vision提供的CameraSourcePreview代码:人脸跟踪器摄像头Source Android:如何提高前置摄像头的质量?,android,android-studio,camera,google-vision,front-camera,Android,Android Studio,Camera,Google Vision,Front Camera,人脸跟踪器应用程序基于。默认情况下,面部跟踪器使用后/后摄像头,但我希望使用前摄像头检测面部 这是google vision提供的CameraSourcePreview代码: package com.google.android.gms.samples.vision.face.facetracker.ui.camera; import android.content.Context; import android.content.res.Configuration; import androi
package com.google.android.gms.samples.vision.face.facetracker.ui.camera;
import android.content.Context;
import android.content.res.Configuration;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.ViewGroup;
import com.google.android.gms.common.images.Size;
import com.google.android.gms.vision.CameraSource;
import java.io.IOException;
public class CameraSourcePreview extends ViewGroup {
private static final String TAG = "CameraSourcePreview";
private Context mContext;
private SurfaceView mSurfaceView;
private boolean mStartRequested;
private boolean mSurfaceAvailable;
private CameraSource mCameraSource;
private GraphicOverlay mOverlay;
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);
}
public void start(CameraSource cameraSource) throws IOException {
if (cameraSource == null) {
stop();
}
mCameraSource = cameraSource;
if (mCameraSource != null) {
mStartRequested = true;
startIfReady();
}
}
public void start(CameraSource cameraSource, GraphicOverlay overlay) throws IOException {
mOverlay = overlay;
start(cameraSource);
}
public void stop() {
if (mCameraSource != null) {
mCameraSource.stop();
}
}
public void release() {
if (mCameraSource != null) {
mCameraSource.release();
mCameraSource = null;
}
}
private void startIfReady() throws IOException {
if (mStartRequested && mSurfaceAvailable) {
mCameraSource.start(mSurfaceView.getHolder());
if (mOverlay != null) {
Size size = mCameraSource.getPreviewSize();
int min = Math.min(size.getWidth(), size.getHeight());
int max = Math.max(size.getWidth(), size.getHeight());
if (isPortraitMode()) {
// Swap width and height sizes when in portrait, since it will be rotated by
// 90 degrees
mOverlay.setCameraInfo(min, max, mCameraSource.getCameraFacing());
} else {
mOverlay.setCameraInfo(max, min, mCameraSource.getCameraFacing());
}
mOverlay.clear();
}
mStartRequested = false;
}
}
private class SurfaceCallback implements SurfaceHolder.Callback {
@Override
public void surfaceCreated(SurfaceHolder surface) {
mSurfaceAvailable = true;
try {
startIfReady();
} catch (IOException e) {
Log.e(TAG, "Could not start camera source.", e);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder surface) {
mSurfaceAvailable = false;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int width = 640;
int height = 480;
if (mCameraSource != null) {
Size size = mCameraSource.getPreviewSize();
if (size != null) {
width = size.getWidth();
height = size.getHeight();
}
}
// Swap width and height sizes when in portrait, since it will be rotated 90 degrees
if (isPortraitMode()) {
int tmp = width;
width = height;
height = tmp;
}
final int layoutWidth = right - left;
final int layoutHeight = bottom - top;
// Computes height and width for potentially doing fit width.
int childWidth = layoutWidth;
int childHeight = (int)(((float) layoutWidth / (float) width) * height);
// If height is too tall using fit width, does fit height instead.
if (childHeight > layoutHeight) {
childHeight = layoutHeight;
childWidth = (int)(((float) layoutHeight / (float) height) * width);
}
for (int i = 0; i < getChildCount(); ++i) {
getChildAt(i).layout(0, 0, childWidth, childHeight);
}
try {
startIfReady();
} catch (IOException e) {
Log.e(TAG, "Could not start camera source.", e);
}
}
private boolean isPortraitMode() {
int orientation = mContext.getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
return false;
}
if (orientation == Configuration.ORIENTATION_PORTRAIT) {
return true;
}
Log.d(TAG, "isPortraitMode returning false by default");
return false;
}
}
与默认手机摄像头应用程序相比,面部跟踪器前摄像头仍然太暗
如何在脸跟踪器google vision中点亮前置摄像头?它与曲面视图有关吗
<com.google.android.gms.samples.vision.face.facetracker.ui.camera.CameraSourcePreview
android:id="@+id/preview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.00"
android:weightSum="1">
<com.google.android.gms.samples.vision.face.facetracker.ui.camera.GraphicOverlay
android:id="@+id/faceOverlay"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.79" />
</com.google.android.gms.samples.vision.face.facetracker.ui.camera.CameraSourcePreview>
它与SurfaceView完全无关。这是一个摄像头API配置错误。您必须在CameraSource.java文件中进行一些额外的更改。 你可以在网上找到它 首先,你需要知道这是一个暴露问题。它指的是相机允许在镜头上接收的光线。你需要知道你的相机是否支持曝光补偿。您必须从您的Camera.Parameters实例中查询和。正如文档所解释的,如果两种方法都返回0,则不支持曝光补偿,并且您也无能为力 幸运的是,大多数情况下,所有手机都支持这一特性。现在,您可以通过调用返回默认值(通常为0,表示未调整曝光)来检查当前相机曝光。现在为了防止暗图像,您只需使用相机参数将新曝光设置在最小值和最大值之间 最后,您可以使用锁定曝光以避免丢失配置,最重要的是:在设置曝光锁定之前,您必须确保返回true 祝你好运
<com.google.android.gms.samples.vision.face.facetracker.ui.camera.CameraSourcePreview
android:id="@+id/preview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1.00"
android:weightSum="1">
<com.google.android.gms.samples.vision.face.facetracker.ui.camera.GraphicOverlay
android:id="@+id/faceOverlay"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="0.79" />
</com.google.android.gms.samples.vision.face.facetracker.ui.camera.CameraSourcePreview>