Camera Motion does not Solve common tracks manually set?

Technical Support Modeling
1

Blender does not Solve the Camera Motion even I marked 15 commons tracks.
I am in the Movie Clip Editor and “open clip” selecting 3 images. The image size is (4000 x 3000 pixels) I do the following actions:

  1. Marker->Add Marker and Move. I move to the image 2 and track (manually), and also over the image 3. So that a polyline (red in pdf figure attached) composed by two segments (three vertices) is generated. That is I marked 1 common track for the three images.
  2. I repeat the step 1 so that I finally have 15 common tracks (each track represented by a polyline with three vertices).
  3. I know the camera parameters (focal, width, optical center, K1 and K2) because I have them from a previous calibration made with specific software.
  4. I try to Solve->Camera Motion, but an error message is displayed: “At least 8 common tracks on both of keyframes are needed for reconstruction”.
  5. My question is: Why does not Blender solve the Camera Motion if I yet marked (manually) 15 common tracks?

Attachments

MotionCameraCommonTracks.pdf (265 KB)

2

only 3 frames??? interesting… anyway, on the left side, in the tool panel solve tab, change keyframe B to 3…you are trying to solve to a frame that you haven’t tracked (frame 30)

3

you have to set the Keyframe B: value (left toolshelf) to 3, so it’s only using those three frames, instead of 1-30 as it’s setup in your screenshot

edit: duh, didn’t read the post above this one :stuck_out_tongue:

4

Thank you gexwing