Vinten Radamec Free-d - Manual (Page 40)

Vinten Broadcast Ltd free - d ™ Installation Manual V1.4.4
Page 40 of 46
Appendix B, Camera positioning parameters
The following sections describe the parameters used to convey the position,
orientation etc. of the studio camera.
B.1 Definition of axes
A set of orthogonal right-handed axes (X, Y and Z) is used, fixed with respect
to the reference frame of the studio. The X and Y axes lie in the horizontal
plane, and the Z axis is vertical. The positive direction of the Z-axis is
upwards.
B.2 Camera pan angle
The Camera Pan Angle is defined as the angle between the Y-axis and the
projection of the optical axis of the camera onto the horizontal (XY) plane. A
zero value corresponds to the camera looking in the positive Y direction and a
positive value indicates a pan to the right (ie, the camera rotates clockwise
when viewed from above).
The value is expressed in degrees as a 24-bit twos-complement signed
number, where the most-significant bit (bit 23) is the sign bit, the next 8 bits
(bits 22 to 15) are the integer part and the remaining bits (bits 14 to 0) are the
fractional part; alternatively, this may be thought of as a signed integer value in
units of 1/32768 degree. The range of values is from -180.0 degrees (A60000
hex) to +180.0 degrees (5A0000 hex).
B.3 Camera tilt angle
The Camera Tilt Angle is defined as the angle between the optical axis of the
camera and the horizontal (XY) plane. A positive value indicates an upwards
tilt. If the pan and tilt angles are both zero, the camera is looking in the
direction of the positive Y axis.
The value is expressed in degrees as a 24-bit twos-complement signed
number, where the most-significant bit (bit 23) is the sign bit, the next 8 bits
(bits 22 to 15) are the integer part and the remaining bits (bits 14 to 0) are the
fractional part; alternatively, this may be thought of as a signed integer value in
units of 1/32768 degree. The range of values is from -90.0 degrees (D30000
hex) to +90.0 degrees (2D0000 hex).
B.4 Camera roll angle
The Camera Roll Angle is defined as the angle of rotation of the camera about
its optical axis. A roll angle of zero corresponds to a ‘scan line’ of the camera
sensor (ie, a horizontal in the image) being parallel to the horizontal (XY)