问题描述
我使用了基本的CameraX示例，能够使用ImageAnalysis例程并逐像素遍历完整的位图，以检测具有给定基本颜色的颜色相似性。 我想要的是以灰度显示预览（所选颜色除外）。 我使用“位图bMap = txView.getBitmap（）;”获得位图。在查看完位图并更改了每个像素后，我使用“ img.setimageBitmap（bMap）;”将位图发送到名为“ img”的Imagview。 我在顶部有我的TextureView INVISIBLE和Imageview以显示修改后的位图。 如果我只得到位图并显示它，我没有问题。但是，当我添加嵌套循环来检查每个像素时，它只需要很长时间。
这是我的代码
private void startCamera() {
//make sure there isn't another camera instance running before starting
CameraX.unbindAll();
/* start preview */
int aspRatioW = 480; //txView.getWidth(); //get width of screen
int aspRatioH = 640;//txView.getHeight(); //get height
Rational asp = new Rational (aspRatioW,aspRatioH); //aspect ratio
Size screen = new Size(aspRatioW,aspRatioH); //size of the screen
//config obj for preview/viewfinder.
PreviewConfig pConfig = new PreviewConfig.Builder().setTargetAspectRatio(asp).setTargetResolution(screen).build();
Preview preview = new Preview(pConfig); //lets build it
preview.setonPreviewOutputUpdateListener(
new Preview.OnPreviewOutputUpdateListener() {
//to update the surface texture we have to destroy it first,then re-add it
@Override
public void onUpdated(Preview.PreviewOutput output){
ViewGroup parent = (ViewGroup) txView.getParent();
parent.removeView(txView);
parent.addView(txView,0);
txView.setSurfaceTexture(output.getSurfaceTexture());
updateTransform();
}
});
/* image capture */
//config obj,selected capture mode
ImageCaptureConfig imgCapConfig = new ImageCaptureConfig.Builder().setCaptureMode(ImageCapture.CaptureMode.MIN_LATENCY)
.setTargetRotation(getwindowManager().getDefaultdisplay().getRotation()).build();
final ImageCapture imgCap = new ImageCapture(imgCapConfig);
findViewById(R.id.capture_button).setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
File file = new File(Environment.getExternalStorageDirectory() + "/" + System.currentTimeMillis() + ".jpg");
imgCap.takePicture(file,new ImageCapture.OnImageSavedListener() {
@Override
public void onImageSaved(@NonNull File file) {
String msg = "Photo capture succeeded: " + file.getAbsolutePath();
Toast.makeText(getBaseContext(),msg,Toast.LENGTH_LONG).show();
}
@Override
public void onError(@NonNull ImageCapture.UseCaseError useCaseError,@NonNull String message,@Nullable Throwable cause) {
String msg = "Photo capture Failed: " + message;
Toast.makeText(getBaseContext(),Toast.LENGTH_LONG).show();
if(cause != null){
cause.printstacktrace();
}
}
});
}
});
/* image analyser */
ImageAnalysisConfig imgAConfig = new ImageAnalysisConfig.Builder().setimageReaderMode(ImageAnalysis.ImageReaderMode.ACQUIRE_LATEST_IMAGE).build();
ImageAnalysis analysis = new ImageAnalysis(imgAConfig);
analysis.setAnalyzer(
new ImageAnalysis.Analyzer(){
@Override
public void analyze(ImageProxy image,int rotationdegrees){
//https://www.codota.com/code/java/methods/android.media.Image/getPlanes
//ByteBuffer yBuffer = image.getPlanes()[0].getBuffer(); // planes[0].buffer // Y
//ByteBuffer uBuffer = image.getPlanes()[1].getBuffer(); // planes[1].buffer // U
//ByteBuffer vBuffer = image.getPlanes()[2].getBuffer(); // planes[2].buffer // V
//byte[] yBufferBytes= new byte[yBuffer.remaining()]; // .remaining is for the size of the buffer
Bitmap bMap = txView.getBitmap();
if (bMap != null){
int Hsize = bMap.getHeight();
int Wsize = bMap.getWidth();
int bmPixel,alpha,redValue,blueValue,greenValue;
int bt_alpha,bt_redValue,bt_blueValue,bt_greenValue;
bt_alpha = Color.alpha(mDefaultColor);
bt_redValue = Color.red(mDefaultColor);
bt_blueValue = Color.blue(mDefaultColor);
bt_greenValue = Color.green(mDefaultColor);
for (int h = 0; h < Hsize; h++){
for (int w = 0; w < Wsize; w++){
bmPixel = bMap.getPixel(w,h);
alpha = Color.alpha(bmPixel);
redValue = Color.red(bmPixel);
blueValue = Color.blue(bmPixel);
greenValue = Color.green(bmPixel);
double d2 = Math.sqrt((0.3*(bt_redValue-redValue)*(bt_redValue-redValue)) + (0.59*(bt_greenValue-greenValue)*(bt_greenValue-greenValue)) + (0.11*(bt_blueValue-blueValue)*(bt_blueValue-blueValue)));
if (d2 > 10){
int newRed,newBlue,newGreen,bmGrey;
bmGrey = (redValue + blueValue + greenValue)/3;
newRed = bmGrey;
newBlue = bmGrey;
newGreen = bmGrey;
bMap.setPixel(w,h,Color.argb(alpha,newRed,newBlue));
}
}
}
ImageView img = (ImageView) findViewById(R.id.image_Changed);
img.setimageBitmap(bMap);
}
image.close();
// https://stackoverflow.com/questions/36212904/yuv-420-888-interpretation-on-samsung-galaxy-s7-camera2
//y'all can add code to analyse stuff here idek go wild.
}
});
//bind to lifecycle:
CameraX.bindToLifecycle((LifecycleOwner)this,analysis,imgCap,preview);
}
关于如何使其更快运行的任何想法？
PS：很抱歉有这么多评论行。我一直在进行很多测试，并在许多地方寻求帮助。
解决方法
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