我正在尝试使用CameraX.
在矩形内捕获图像，如图所示
我的方法是，计算屏幕与捕获图像的比例，然后将相机中可见的矩形Map到另一个矩形（相当于捕获的图像），然后裁剪位图。代码如下所示。fragment_scan_doc.xml
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/clRoot"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.widget.Guideline
android:id="@+id/gdl_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="28dp" />
<TextView
android:id="@+id/tvTitle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/margin_25dp"
android:text="@string/app_name"
android:textColor="@color/black"
android:textSize="@dimen/text_size_24sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="@id/gdl_right"
app:layout_constraintStart_toStartOf="@id/gdl_left"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/tvDesc"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/margin_16dp"
android:text="@string/place_doc"
android:textColor="@color/black"
app:layout_constraintEnd_toEndOf="@+id/gdl_right"
app:layout_constraintStart_toStartOf="@+id/gdl_left"
app:layout_constraintTop_toBottomOf="@+id/tvTitle" />
<androidx.camera.view.PreviewView
android:id="@+id/previewView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="@dimen/dimen_24dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tvDesc" />
<TextView
android:id="@+id/tvCamera"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="13dp"
android:background="@drawable/bg_round_white_solid_yellow_stripe"
android:gravity="center"
android:paddingStart="@dimen/dimen_25dp"
android:paddingTop="@dimen/dimen_10dp"
android:paddingEnd="@dimen/dimen_25dp"
android:paddingBottom="@dimen/dimen_10dp"
android:text="Front"
android:textColor="@color/black"
app:layout_constraintEnd_toEndOf="@id/gdl_right"
app:layout_constraintStart_toStartOf="@id/gdl_left"
app:layout_constraintTop_toTopOf="@+id/previewView" />
<View
android:id="@+id/border_view"
android:layout_width="325dp"
android:layout_height="202.5010436dp"
android:background="@drawable/bg_round_grey_stripe"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="@id/gdl_right"
app:layout_constraintStart_toStartOf="@id/gdl_left"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/tvPoweredBy"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="Powered by"
android:textColor="@color/white"
app:layout_constraintEnd_toEndOf="@id/gdl_right"
app:layout_constraintStart_toStartOf="@id/gdl_left"
app:layout_constraintTop_toBottomOf="@+id/border_view" />
<View
android:id="@+id/vTakePhoto"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginBottom="20dp"
android:background="@drawable/bg_round_white_solid_stripe"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
/>
<ImageView
android:id="@+id/ivFlash"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="40dp"
android:background="@drawable/bg_circle_white_solid"
android:padding="10dp"
android:src="@drawable/ic_baseline_flash_off_24"
app:layout_constraintBottom_toBottomOf="@+id/vTakePhoto"
app:layout_constraintStart_toEndOf="@+id/vTakePhoto"
app:layout_constraintTop_toTopOf="@+id/vTakePhoto" />
<ProgressBar
android:id="@+id/progressBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:elevation="50dp"
android:visibility="gone"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/gdl_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_end="28dp" />
</androidx.constraintlayout.widget.ConstraintLayout>在这里，我从camerax获取Image，并将其提交给cropImage()函数
private fun takePhoto() {
imageCapture?.takePicture(ContextCompat.getMainExecutor(requireContext()),
object : ImageCapture.OnImageCapturedCallback() {
@SuppressLint("UnsafeOptInUsageError")
override fun onCaptureSuccess(imageProxy: ImageProxy) {
val image = imageProxy.image?.let { image ->
InputImage.fromMediaImage(
image,
imageProxy.imageInfo.rotationDegrees
)
}
cropImage(imageProxy)
}
override fun onError(exception: ImageCaptureException) {
exception.printStackTrace()
}
})
}这是cropImage()函数
private fun cropImage(imageProxy: ImageProxy) {
val ori = imageProxy.convertImageProxyToBitmap().rotate(90f)
val rect = Rect()
mViewBinding.borderView.getGlobalVisibleRect(rect)
val screenWidth = mViewBinding.root.width
val screenHeight = mViewBinding.root.height
val ratioW = screenWidth.toFloat() / ori.width // I am trying to get the ratio of screen to image width
val ratioH = screenHeight.toFloat() / ori.height
val x1 = rect.left / ratioW
val y1 = rect.top / ratioH
val x1W = rect.right / ratioW
val x1H = rect.bottom / ratioH
val rect1 = Rect(x1.toInt(), y1.toInt(), x1W.toInt(), x1H.toInt())
val cropedBm = Bitmap.createBitmap(
ori,
rect1.left,
rect1.top,
rect1.right - rect1.left,
rect1.bottom - rect1.top
)
processNewBitmap(cropedBm) // this is where I display the cropped bitmap and it appears like in the image below
}
图像被裁剪到矩形框下方一点。
我不太确定我做错了什么。任何帮助或指导都将不胜感激。谢谢
1条答案
按热度按时间s3fp2yjn1#
你的ImageProxy有一个位图，你想用一个宽度或高度不同的视图覆盖来裁剪它。2你必须用缩放比例来计算。
您可以访问此链接：https://www.codeproject.com/Articles/1276135/Crop-Image-from-Camera-on-Android