java – 断言失败(scn == 3 || scn == 4)in void cv :: cvtColor(cv :: InputArray Android
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了java – 断言失败(scn == 3 || scn == 4)in void cv :: cvtColor(cv :: InputArray Android，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5245字，纯文字阅读大概需要8分钟。
内容图文
我正在尝试将Mat转换为灰度值,以便我可以获得像素的数值.在虚拟机cv :: cvtColor(cv :: InputArray错误)上我得到了一个“断言失败(scn == 3 || scn == 4).我知道我错过了什么,但我不知道它是什么.
码
import android.nfc.Tag;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.SurfaceView;
import android.hardware.camera2.CameraCaptureSession;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
import org.opencv.android.JavaCameraView;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.core.MatOfKeyPoint;
import org.opencv.core.MatOfPoint;
import org.opencv.imgproc.Imgproc;
import org.opencv.highgui.Highgui;
public class testActivity extends AppCompatActivity implements CvCameraViewListener2 {
private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
@Override
public void onManagerConnected(int status){
switch (status){
case LoaderCallbackInterface.SUCCESS:
{
mOpenCvCameraView.enableView();
break;
}
default:
{
super.onManagerConnected(status);
}
}
}
};
private JavaCameraView mOpenCvCameraView;
Mat bgrPixel;
Mat grayPixel;
Mat rgbMat;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test);
mOpenCvCameraView = (JavaCameraView) findViewById(R.id.testVideoView);
mOpenCvCameraView.setMaxFrameSize(240,320);
mOpenCvCameraView.setVisibility(SurfaceView.VISIBLE);
mOpenCvCameraView.setCvCameraViewListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
//getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
getSupportActionBar().hide();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void onDestroy() {
super.onDestroy();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
public void onResume() {
super.onResume();
if (!OpenCVLoader.initDebug()) {
OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, this, mLoaderCallback);
} else {
mLoaderCallback.onManagerConnected(LoaderCallbackInterface.SUCCESS);
}
}
@Override
public void onPause() {
super.onPause();
if (mOpenCvCameraView != null)
mOpenCvCameraView.disableView();
}
@Override
public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
if(rgbMat == null){
rgbMat = inputFrame.rgba();
bgrPixel= rgbMat.submat(1,1,2,2).clone();
grayPixel = new Mat();
Imgproc.cvtColor(bgrPixel, grayPixel, Imgproc.COLOR_BGR2GRAY,1);
}
rgbMat= inputFrame.rgba();
return rgbMat;
}
@Override
public void onCameraViewStarted(int width, int height) {
}
@Override
public void onCameraViewStopped() {
bgrPixel.release();
grayPixel.release();
rgbMat.release();
}
}
原木猫
08-18 14:44:37.649 17571-17884/bluemage.systems.displaylatencytester E/cv::error()﹕ OpenCV Error: Assertion failed (scn == 3 || scn == 4) in void cv::cvtColor(cv::InputArray, cv::OutputArray, int, int), file /home/reports/ci/slave_desktop/50-SDK/opencv/modules/imgproc/src/color.cpp, line 3737
08-18 14:44:37.650 17571-17884/bluemage.systems.displaylatencytester E/org.opencv.imgproc﹕ imgproc::cvtColor_10() caught cv::Exception: /home/reports/ci/slave_desktop/50-SDK/opencv/modules/imgproc/src/color.cpp:3737: error: (-215) scn == 3 || scn == 4 in function void cv::cvtColor(cv::InputArray, cv::OutputArray, int, int)
08-18 14:44:37.659 17571-17884/bluemage.systems.displaylatencytester E/AndroidRuntime﹕ FATAL EXCEPTION: Thread-4081
Process: bluemage.systems.displaylatencytester, PID: 17571
CvException [org.opencv.core.CvException: cv::Exception: /home/reports/ci/slave_desktop/50-SDK/opencv/modules/imgproc/src/color.cpp:3737: error: (-215) scn == 3 || scn == 4 in function void cv::cvtColor(cv::InputArray, cv::OutputArray, int, int)
]
at org.opencv.imgproc.Imgproc.cvtColor_0(Native Method)
at org.opencv.imgproc.Imgproc.cvtColor(Imgproc.java:4244)
at bluemage.systems.displaylatencytester.testActivity.onCameraFrame(testActivity.java:117)
at org.opencv.android.CameraBridgeViewBase.deliverAndDrawFrame(CameraBridgeViewBase.java:387)
at org.opencv.android.JavaCameraView$CameraWorker.run(JavaCameraView.java:328)
at java.lang.Thread.run(Thread.java:818)
解决方法:
if(rgbMat == null){
rgbMat = inputFrame.rgba();
bgrPixel= rgbMat.submat(1,1,2,2).clone();
grayPixel = new Mat();
Imgproc.cvtColor(bgrPixel, grayPixel, Imgproc.COLOR_BGR2GRAY,1);
}
我在这里看到两个错误.我猜你是想提取第一个像素.我不知道你的是否是最好的方法,但是submat()(见[here](http://docs.opencv.org/java/org/opencv/core/Mat.html#submat(int,int,int,int)))需要rowStart,rowEnd,colStart,colEnd.所以你应该把它改成submat(1,2,1,2).
另请注意,rgba()返回RGBA图像,因此您应该使用Imgproc.COLOR_RGBA2GRAY.
内容总结
以上是互联网集市为您收集整理的java – 断言失败(scn == 3 || scn == 4)in void cv :: cvtColor(cv :: InputArray Android全部内容，希望文章能够帮你解决java – 断言失败(scn == 3 || scn == 4)in void cv :: cvtColor(cv :: InputArray Android所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。
来源：【匿名】