When Error Occurs

DllNotFoundException / TypeInitializationException

• Put all OpenCV's DLLs (e.g. opencv_core245.dll) into the same directory as the executable file (e.g. bin/Debug).
• Check that you have installed Visual C++ Redistributable Package.

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BadImageFormatException

For 32-bit OS

• Check that you use the x86 version of OpenCV/OpenCvSharp DLLs.

For 64-bit OS

• Check the target platform of OpenCV you installed (x86 or x64).
• Understand that the x64 version of OpenCvSharp is NOT for 64-bit OS but for x64 OpenCV DLLs.
• If you installed 32-bit OpenCV, you need to use x86 version of OpenCvSharp. And change your project's target platform from "Any CPU" to "x86".

See also: http://www.broculos.net/tutorials/badimageformatexception_was_unhandled/20080307/en