Advisor suggests to change my research topic after unsuccessful start, unsure what to do I am a first-year doctoral student in Computer Vision, and have some confusion about my research direction recently. I hope I can get some help and advice there.

A couple of months ago, I was arranged to do research about optical flow, which is a kind of motion representation and can be used in many computer vision tasks. In these days, I read many papers and did lots of experiment about optical flow about its history, datasets and criterion. Therefore, I began to believe maybe I could make some contribution to that. Since some previous ideas are proved not working, the professor suggested me to give up the research on optical flow and change to another.

Now I am very hesitant about the next plan, there are two reasons. On the one hand, I am not content to give up just like that, and I think we could do more. On the other hand, I know very little other directions in computer vision, so I am not certain which direction I should choose. For computer vision, I want to try everything. Although optical flow is not my favorite one, I can insist on it. I really want to choose a research direction, and spend several years or the whole PhD stage to do some meaningful works.

What should I do? I hope experienced people can give me advice. Thank you!
You should be talking to your advisor(s) and you may have some good points to discuss.

If you think you have some relevant ideas, then you should discuss them with your advisor - one may be the "key" you are looking for.

If, after considering your points, the advisor still has good reason to think that there is no future, then you should accept that decision, clear in the knowledge that you put your points across.

So, discuss with your advisor and make an informed choice with them.