I understand that you want to convert the .m file to .cpp file and the .m file consists of inbuilt functions from Image processing toolbox, so for this you can use MATLAB Coder.
Some Image Processing Toolbox™ functions enable you to generate standalone C code, C code that depends on a precompiled, platform-specific shared library, or both. You can check the list of Image Processing Toolbox functions that support code generation - https://in.mathworks.com/help/images/referencelist.html?type=function&capability=codegen
In generated code, each supported toolbox function has the same name, arguments, and functionality as its Image Processing Toolbox counterpart. To use code generation with image processing functions, you can follow the steps mentioned in the below link - https://in.mathworks.com/help/images/code-generation-for-image-processing.html
