CameraX Image Analysis (with OUTPUT_IMAGE_FORMAT_RGBA_8888) : maxImages (4) 已经被获取，在获取更多之前调用#close
[英]CameraX Image Analysis (with OUTPUT_IMAGE_FORMAT_RGBA_8888) : maxImages (4) has already been acquired, call #close before acquiring more
问题描述
I am trying to implement a very basic CameraX Image Analysis use case where I would send the images received by the analyzer to a tflite classifier model.
我正在尝试实现一个非常基本的 CameraX 图像分析用例，我会将分析器接收到的图像发送到 tflite 分类器模型。 The model only accepting bitmap as inputs I thought I would set OUTPUT_IMAGE_FORMAT_RGBA_8888 when building the ImageAmalysis.该模型只接受位图作为输入，我以为我会在构建 ImageAmalysis 时设置 OUTPUT_IMAGE_FORMAT_RGBA_8888。 Resulting media images are easier to convert to bitmaps than the standard YUV_420_888 ones.生成的媒体图像比标准的 YUV_420_888 更容易转换为位图。 Problem is I get a error : "java.lang.IllegalStateException: maxImages (4) has already been acquired, call #close before acquiring more."问题是我收到一个错误：“java.lang.IllegalStateException：maxImages (4) 已经被获取，在获取更多之前调用 #close。” Usually it would mean I have forgotten to close the imageProxy but it is not the case so I don't know what is wrong with my code.通常这意味着我忘记关闭 imageProxy 但事实并非如此，所以我不知道我的代码有什么问题。 See below:见下文：
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.media.Image;
import android.os.Bundle;
import android.util.Size;
import androidx.camera.core.Camera;
import androidx.camera.core.CameraSelector;
import androidx.camera.core.ExperimentalGetImage;
import androidx.camera.core.ImageAnalysis;
import androidx.camera.core.ImageProxy;
import androidx.camera.core.Preview;
import androidx.camera.lifecycle.ProcessCameraProvider;
import androidx.camera.view.PreviewView;
import androidx.core.content.ContextCompat;
import androidx.lifecycle.LifecycleOwner;
import com.google.common.util.concurrent.ListenableFuture;
import java.nio.ByteBuffer;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;
public class MainActivity extends AppCompatActivity {
private ListenableFuture<ProcessCameraProvider> cameraProviderFuture;
private Executor analysisExecutor;
private PreviewView previewView;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
analysisExecutor = Executors.newSingleThreadExecutor();
setContentView(R.layout.activity_main);
previewView = findViewById(R.id.viewFinder);
cameraProviderFuture = ProcessCameraProvider.getInstance(this);
cameraProviderFuture.addListener(() -> {
try {
ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
cameraProvider.unbindAll();
bindUseCases(cameraProvider);
} catch (ExecutionException | InterruptedException e) {
// No errors need to be handled for this Future.
// This should never be reached.
}
}, ContextCompat.getMainExecutor(this));
}
void bindUseCases(@NonNull ProcessCameraProvider cameraProvider) {
CameraSelector cameraSelector = new CameraSelector.Builder()
.requireLensFacing(CameraSelector.LENS_FACING_BACK)
.build();
//Preview
Preview preview = new Preview.Builder()
.build();
preview.setSurfaceProvider(previewView.getSurfaceProvider());
//ImageAnalysis
ImageAnalysis imageAnalysis =
new ImageAnalysis.Builder()
.setTargetResolution(new Size(1280, 720))
.setBackpressureStrategy(ImageAnalysis.STRATEGY_KEEP_ONLY_LATEST)
.setOutputImageFormat(ImageAnalysis.OUTPUT_IMAGE_FORMAT_RGBA_8888)
.build();
imageAnalysis.setAnalyzer(analysisExecutor, new ImageAnalysis.Analyzer() {
@Override
@ExperimentalGetImage
public void analyze(@NonNull ImageProxy imageProxy) {
//my code to turn media image into a bitmap
Image img = imageProxy.getImage();
Image.Plane[] planes = img.getPlanes();
ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int rowPadding = rowStride - pixelStride * img.getWidth();
Bitmap bitmap = Bitmap.createBitmap(img.getWidth()+rowPadding/pixelStride, img.getHeight(), Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
//close img and imageProxy
img.close();
imageProxy.close();
}
});
Camera camera = cameraProvider.bindToLifecycle((LifecycleOwner)this, cameraSelector, imageAnalysis, preview);
}
} }
And the complete error message:以及完整的错误信息：
E/ImageAnalysisAnalyzer: Failed to acquire image.
2 个解决方案
解决方案1
0 2021-10-21 09:44:10
i think imageProxy.close();我认为 imageProxy.close(); too late before analyze return new ImageProxy.在分析返回新的 ImageProxy 之前为时已晚。 maybe call imageProxy.close() below of imageProxy.getImage();.也许调用 imageProxy.getImage(); 下面的 imageProxy.close();。 hope this help for you希望这对你有帮助
解决方案2
0 2021-10-21 09:48:40
You should close the image right after you got all the needed data from it like this:您应该在从中获取所有需要的数据后立即关闭图像，如下所示：
public void analyze(@NonNull ImageProxy imageProxy) {
//my code to turn media image into a bitmap
Image img = imageProxy.getImage();
Image.Plane[] planes = img.getPlanes();
ByteBuffer buffer = planes[0].getBuffer();
int pixelStride = planes[0].getPixelStride();
int rowStride = planes[0].getRowStride();
int imgWidth = img.getWidth();
int imgHeight = img.getHeight();
//close img and imageProxy
img.close();
imageProxy.close();
int rowPadding = rowStride - pixelStride * img.getWidth();
Bitmap bitmap = Bitmap.createBitmap(imgWidth + rowPadding / pixelStride, imgHeight, Bitmap.Config.ARGB_8888);
bitmap.copyPixelsFromBuffer(buffer);
}
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