davidparks21's profile - activity

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2017-08-22 11:05:12 -0600	commented question	How to rotate a camera to point to an object on the screen Is that a 4D transformation matrix? It's been a while since I studied that and I don't remember the details extremely well. And once I have the transformation matrix, do I move the world space vectors to pixel space, perform the rotation, then apply the transpose of the transformation matrix again?
2017-08-21 15:12:57 -0600	received badge	● Enthusiast
2017-08-20 16:00:03 -0600	asked a question	How to rotate a camera to point to an object on the screen I have a camera which points in a direct, I have a unit vector `C` which describes the orientation of the camera in world coordinates. There is a point of interest in the image taken by the camera. Given the field of view of the camera and image size, I can compute two vectors in pixel space: `A`, the principal point (center point of the image), and `B` the point of interest in pixel space. I want to rotate the camera `C` (in world coordinates) such that it now points at the object represented on screen by `B` It's unclear to me how to transition between the on-screen pixel-space orientation of vectors `A` and `B` and the world space vector `C`.
2017-07-24 18:08:55 -0600	received badge	● Editor (source)
2017-07-24 18:08:16 -0600	asked a question	Given the fundamental matrix can I get camera angle relative to a plane? I have 6 stereo images of a plane (wall) with the scale marked (by tape measure). The cameras are at varying position and angles. I can compute the fundamental matrix with `findFundamentalMat(...)`. I do not (yet) know the essential matrix. I also have the coordinates of the cameras in world space. Can I determine the angles of the cameras in world coordinates using `F` (fundamental matrix) and the world coordinates of the cameras without the essential matrix?