Can you recommend on a way how to align all cameras ? height / fov / angle ?
The "Simple" Multi-Camera "Alignment" answer is here.
CHDK PTP multiple instances; Reply by H-H #31 on: 17/September/2013
http://chdk.setepontos.com/index.php?topic=8769.msg105454#msg105454You just need three ping-pong or tennis balls, suspended, on a fishing line,
at the geometric center of your Multi-Camera Array.
And Reply #45 on: 18/September/2013, the alignment Graphic is here.
http://chdk.setepontos.com/index.php?action=dlattach;topic=8769.0;attach=9068Your Multi-Camera Array has its Maximum Parallax in the, fixed, Horizontal Plane.
You then, simply, "Align" your Multi-Camera Array for Minimum Parallax in the Vertical Plane, located at
the arrays geometric center.
The "Complex" Multi-Camera "Alignment" answer is here. (
)
Image Alignment and Stitching: A Tutorial
by Richard Szeliski Microsoft Research, USA,
~~~~"sparse set of features"~~~~ OR JUST ===="three ping-pong balls"====
"...While most of the above techniques work by directly minimizing pixel-to-pixel dissimilarities, a
different class of algorithms works by extracting a sparse set of features and then matching these
to each other [7,30,35,38,129,227]..."
"....Feature-based approaches have the advantage of being more robust against scene movement
and are potentially faster, if implemented the right way...."
"....Their biggest advantage, however, is the ability to “recognize panoramas,” i.e., to automatically discover the adjacency (overlap) relationships among an unordered set of images, which makes
them ideally suited for fully automated stitching of panoramas taken by casual users..."
~~~~"if implemented the right way"~~~~ OR ~~~~by using A_I_S 2014~~~~
NEW A_I_S PAGE HERE
http://hugin.sourceforge.net/docs/manual/Align_Image_Stack.html"A_I_S ... is particularly useful for this process since it allows sub-pixel alignment...."
The ===="three ping-pong balls"==== give you the three, "COMMON", control points. [3 x 24 C.P's]
The "Anchor Image", is an Absolute Image, and NOT a series of Relative Images.
The "Anchor Image" is "COMMON" and "ALWAYS" linked "ALL" other Images.
The Minimum number of control points required is "TWO". [2]
The Maximum number of control points required is "THREE". [3]
The number of, optional, control points, between adjacent images is THREE. [3]
[r] Optimize "Roll" Angle of the camera position.
[-X] Optimize "X" Coordinate of the camera position.
[-Y] Optimize "Y" Coordinate of the camera position.
~~~Others~~~~
[-v ] Verbose, print progress messages
[-z = 0] Optimize "Z" coordinate of the camera position. Useful for aligning more distorted images.
[-f HFOV] Approximate horizontal field of view of input images, use if EXIF info not complete.
[-l] Assume Linear Input Files.
~~~These, Always Set to Zero~~~~
Rectilinear, when the cameras in the array are set perpendicular to Horizontal Plane
and tangential to the rigs camera mounting ring.
[p] Pitch is ZERO (0) (Unselected)
[y] Yaw is ZERO (0) (Unselected)
~~~~~~Comments~~~~~~~~~~~~
Hugin GUI treats Image Stacks as Panoramas. (
)
Align_Image_Stack "Roll" Angles can, very quickly, become corrupted. (
)
Camera alignment is only done once and only realigned if the rig is changed.
The Align_Image_Stack, Alignment Data, is common to all the Multi-Cam rig images.
H-H
