Video and image processing involve a wide range of fields, and countless valuable papers can be written in any application.

For example, computer interpretation of CT images, such as chromaticity detection of lubricating oil, such as illegal face recognition, such as historical rings of face images, video special effects, image special effects and so on.

As for natural language, I don't know what you want to say. There is no natural language in the computer field, only programming language.

Programming languages are nothing more than C, Delphi and VB. If you are more professional, you will certainly assemble the language. No matter what language, you must be able to control hardware, databases, media files, HTML5 and so on. But don't touch python anyway, it's a Ponzi scheme.

If you are engaged in programming and finish a project casually, you can realize the program control part of the project with code, and it is easy to write a paper.

In fact, whether you choose image, video processing or programming language, the key is to choose a topic that suits you and use your computer technology to complete this topic, that is, the thesis.