OpenCV Error: '(-215:Assertion failed) isIdentity(expr)' in 'matrix_expressions.cpp' - Troubleshooting Guide

This error occurs when the matrix expression being passed to a function expects an identity matrix, but the matrix expression is not an identity matrix.

To fix this error, you need to ensure that the matrix expression being passed is an identity matrix. Here are some possible solutions:

1. Check the code where the matrix expression is being created and ensure that it is an identity matrix.

2. If the matrix expression is being created dynamically, ensure that the matrix elements are set correctly to create an identity matrix.

3. Use a pre-defined identity matrix instead of creating a matrix expression dynamically.

4. Check the documentation for the function where the matrix expression is being passed and ensure that it expects an identity matrix. If not, you may need to modify the matrix expression or use a different function.