我试图将Point2f imagePoints写入openCV中的Mat图像。我正在关注以下链接。
Create Mat from vector<point2f>
但我得到'断言失败'的错误。请帮忙。
代码：
std::vector<cv::Point3d> objectPoints;
std::vector<cv::Point2d> imagePoints;
cv::Mat intrisicMat(3, 3, cv::DataType<double>::type);
intrisicMat.at<double>(0, 0) = param.focalLength.first;
intrisicMat.at<double>(0, 1) = 0;
intrisicMat.at<double>(0, 2) = param.principalPoint.first;
intrisicMat.at<double>(1, 0) = 0;
intrisicMat.at<double>(1, 1) = param.focalLength.second;
intrisicMat.at<double>(1, 2) = param.principalPoint.second;
intrisicMat.at<double>(2, 0) = 0;
intrisicMat.at<double>(2, 1) = 0;
intrisicMat.at<double>(2, 2) = 1;
cv::Mat rVec(3, 1, cv::DataType<double>::type); // Rotation vector
rVec.at<double>(0) = 0;
rVec.at<double>(1) = 0;
rVec.at<double>(2) = 0;
cv::Mat tVec(3, 1, cv::DataType<double>::type); // Translation vector
tVec.at<double>(0) = 0;
tVec.at<double>(1) = 0;
tVec.at<double>(2) = 0;
cv::Mat distCoeffs(5, 1, cv::DataType<double>::type); // Distortion vector
distCoeffs.at<double>(0) = param.distortionRadial.at(0);
distCoeffs.at<double>(1) = param.distortionRadial.at(1);
distCoeffs.at<double>(2) = param.distortionTangential.first;
distCoeffs.at<double>(3) = param.distortionTangential.second;
distCoeffs.at<double>(4) = param.distortionRadial.at(2);
projectPoints(objectPoints, rVec, tVec, intrisicMat, distCoeffs, imagePoints);
Mat depthImage = Mat(imagePoints);
imwrite("E:/softwares/1.8.0.71/bin/depthImage.jpg", depthImage);
cout << "depthImage.channels()=" << depthImage.channels() << endl;
错误：
OpenCV Error: Assertion failed (image.channels() == 1 || image.channels() == 3 || image.channels() == 4) in cv::imwrite_, file E:\softwares\opencv-3.1.0\opencv-3.1.0\modules\imgcodecs\src\loadsave.cpp, line 455
我的图片有2个频道。所以ImWrite（）抛出断言失败错误。如果不是这样的话，如何使用Image点创建Mat图像？
答案 0 :(得分：1)
根据您在评论中所写的内容，您似乎正在尝试将public class DecryptActivity extends AppCompatActivity {
EditText ed1;
TextView tv;
Button b1,b2;
byte[] decrypted;
String decryptedText = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.decrypt_activity);
ed1 = (EditText) findViewById(R.id.decrypteditText);
b1 = (Button) findViewById(R.id.decryptbutton);
b1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("asd","inside onclick");
try {
Log.d("asd","inside try of decryptActivity");
KeyGenerator keygenerator = KeyGenerator.getInstance("Blowfish");
SecretKey secretkey = keygenerator.generateKey();
Cipher cipher2 = Cipher.getInstance("Blowfish");
cipher2.init(Cipher.DECRYPT_MODE,secretkey);
Log.d("asd","in decrypt key is"+secretkey.toString());
Log.d("asd","before getBytes");
byte[] encrypted =ed1.getText().toString().getBytes();
Log.d("asd",ed1.getText().toString());
decrypted = cipher2.doFinal(encrypted);
tv=(EditText)findViewById((R.id.textView));
tv.setText("Asd");
Log.d("asd",new String(decrypted));
} catch (Exception e) {
}
Toast.makeText(getApplicationContext(), "Text Pasted", Toast.LENGTH_SHORT).show();
}
});
}
写入文件。问题是，来自Mat的{{1}}将提供2通道矩阵，这与任何图像格式（灰度，RGB或RGBA）都不兼容。
此外，请编辑您的主要帖子以显示代码（使用降价），以便更容易阅读，然后帮助您。