hi,
 
im just trying to learn something about matchmoving with the realviz application which is used in our company.
 
Using the manual is fine and often helps but some points are really unclear.
 
1. Point Relations
the relation between two points. alright but which is the target coordinatessytem?
the coordinatessytem which is set up in the application or the world coordinatessytem?
for example.. if i have filmed the front of an house with some windows. from my point of view the upper  corners of these windows share the y value. but is this still true with a skew camera?
 
 
2. squezze factor
i use 1440x1080 from an hdv camcorder. its an 4:3 display aspect ratio. the camera uses an amorph lense to store the 16:9 picture with an 4:3 ccd-chip.
is it right to use the squezze factor of 1.33 to have the right display aspect ratio in the application?
has this squezze an influence on the calculation or does it only effect the current display?
 
edit:
3. focal length.
is the value in relation to 35mm or the original value of the lensessystem?
( my camcorder has a focal length from 4.5 to 54mm or 32.5 to 390mm in relation to 35mm film.)
 
(...hoping my english is good enough to explain my problems. )
 
best regards
chris.

Hi chris, I am having a simular problem, with regards to the squeeze, I dont know how to get the export to match the clip I worked on with the correct ratio...One way to do it is to match the clip with its 4*3 ratio, then correct the squeeze in post.
 
There is one problem with that, and its the inability to track markers when clip is at 4*3 ratio. when squeeze is set to 1.33, MM has less trouble tracking.

Hi Ivan,
 
im not sure.  
using the 4:3 DAR might be a problem, because this ratio shows distort picture of the mapped scene.
i think you really have to use the 16:9 DAR. on the one way by using the squezze which results in a 1440x812 DAR in matchmover or maybe make a pre-render to have the 1920x1080 resolution.
maybe the squezze is the better solution because of less interpolation.

The problem of the squeeze factor is a particular problem of HDV cameras: The SONY-Z1 has a 16/9 chip, but records a 1440x1080 image, because there is a horizontal gap between the pixels. (It's almaost like a non-square pixel aspect ratio (like PAL), although the physical size of these pixels is square). I had the best tracking results in prior unsqueezing the footage to a real 1920x1080 with a square PAR.
Best regards
Tim