Can I get Essential Matrix from Fundamental matrix with few matching keypoints, but without intrinsic parameters?
No you can't, you need to know the metric size of the pixel and the focal because essential matrix is in the real world.
Firstly I guess this question might be duplicated, but I couldn't find it.
Question. It's actually in the title.

Can I get Essential Matrix from Fundamental matrix with few matching keypoints, but without intrinsic parameters?

Situation. I am trying to find Essential matrix. I use my phone camera to take photos, and then extract keypoints using SIFT(or ORB). I have 2 images of an object and it's matching points. I could get F, Fundamental Matrix but I have no idea how to get Essential Matrix from this.
I don't have camera intrinsic parameters, such as Fx, Fy, Cx, Cy.
I am stuck to this situation. I googled but couldn't get answers.
Let me know if it's duplicated then I'd delete this.
PLUS: I also don't have camera coordinates or world coordinates.