JP4402177B2 - Operation unit of the imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation unit of an imaging apparatus, and more particularly to an operation unit of an imaging apparatus for remotely controlling a remote control pan head and a television camera mounted on the remote control pan head.
[0002]
[Prior art]
When synthesizing a real video and a computer graphics video, a main subject is photographed in a virtual studio such as a broadcasting station, and the real video and a computer graphics video indicating the background of the real video are synthesized. In the virtual studio system, the pan angle and tilt angle of the remote control platform and the zoom of the lens of the TV camera mounted on the remote control platform are used to change the computer graphics image according to the movement of the live-action video. Position information indicating the position and focus lens position is transmitted to the computer.
[0003]
FIG. 3 shows a conventional system of this type, in which 1 is an operation unit, 20 is a photographing device showing a remote control pan head and a TV camera mounted on the remote control pan head, and 30 is a computer.
The operation unit 1 can send analog signals indicating the pan angle, tilt angle, zoom position, and focus lens position to the photographing apparatus 20 via the multi-cable 2. Remote control. On the other hand, the photographing device 20 converts the analog voltage of the potentiometer that detects the pan angle, tilt angle, zoom position, and focus lens position into a digital signal by an A / D converter, and takes the digital signal into the central processing unit. The data is transmitted to the computer 30 via the serial communication cable 3.
[0004]
[Problems to be solved by the invention]
However, in the conventional system, an A / D converter that converts the analog voltage of each potentiometer into a digital signal must be provided in the photographing apparatus 20, and an A / D converter that requires high speed and high accuracy is particularly expensive. Therefore, there is a problem that the cost increases. In addition, since a printed circuit board space for providing an A / D converter or the like is also required, there is a problem that the apparatus is increased in size.
[0005]
The present invention has been made in view of such circumstances, and it is not necessary to provide an A / D converter or the like in the photographing apparatus, thereby providing an operation unit of the photographing apparatus that can achieve cost reduction and space saving. For the purpose.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an operation unit of a photographing apparatus that outputs a position signal indicating a control target value to a driving unit of a remote control pan head and a driving unit of the photographing apparatus mounted on the remote control pan head. , A digital signal to which a delay from when the position signal is output until the drive unit reaches the position indicated by the position signal is calculated in advance, and the position signal is output to the drive unit. Synchronously, the calculated digital signal is transmitted to a computer.
[0007]
According to the present invention, the voltage value of the potentiometer indicating the current position (pan angle or tilt angle) of the drive unit of the remote control pan head and the current position (zoom position or focus lens position) of the drive unit of the photographing apparatus is expressed by A / Instead of converting to a digital signal by a D converter, a digital signal indicating the current position is calculated from a commanded position signal in consideration of a delay element of the drive unit, and the digital signal is transmitted to a computer. ing.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the operation unit of the photographing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a system to which an operation unit according to the present invention is applied.
In the figure, 10 is an operation unit according to the present invention, 20 'is a photographing apparatus not provided with an A / D converter and the like, and 30 is a computer. The operation unit 10 and the photographing apparatus 20 ′ are connected by a multi-cable 2, and the operation unit 10 and the computer 30 are connected by a serial communication cable 3.
[0009]
FIG. 2 is a block diagram showing a main configuration of the system shown in FIG.
As shown in FIG. 2, the operation unit 10 mainly includes an operation unit 11, a central processing unit (CPU) 12, a D / A converter 13, a memory 14, an interface 15, and the like.
As shown in FIG. 1, the operation unit 11 includes a joystick 11A for instructing a pan angle and a tilt angle, a zoom dial 11B for instructing a zoom position, a focus dial 11C for instructing a focus lens position, and a desired shot. The button group 11D and the like for selecting appropriate shot information from a plurality of pieces of shot information stored in advance. Each shot information is composed of information indicating a pan angle, a tilt angle, a zoom position, and a focus lens position.
[0010]
Signals corresponding to the operation amounts of the joystick 11A, zoom dial 11B, focus dial 11C and the like are applied to the CPU 12. The CPU 12 integrates signals corresponding to the input operation amount and converts them into position data. That is, when the joystick 11A is tilted in the left-right direction, position data (pan angle data) in which the pan angle sequentially changes corresponding to the tilt angle of the joystick 11A is obtained, and when the joystick 11A is tilted up and down, the joystick Tilt angle data in which the tilt angle sequentially changes corresponding to the tilt angle of 11A is obtained. Similarly, when the zoom dial 11B is rotated, zoom position data in which the zoom position sequentially changes corresponding to the rotation amount is obtained, and when the focus dial 11C is rotated, the focus lens is sequentially corresponding to the rotation amount. Find focus lens position data whose position changes.
[0011]
The pan angle data, the tilt angle data, the zoom position data, and the focus lens position data are converted into analog signals by the D / A converter 13, respectively, and the analog input from the analog output terminal 16 to the multi-cable 2 and the photographing device 20 ′. The signals are output to the pan driving unit 21, the tilt driving unit 22, the zoom driving unit 23, and the focus driving unit 24 via the terminal 25.
[0012]
The pan driving unit 21 mainly includes a servo amplifier 21A, a motor 21B, and a potentiometer 21C that outputs a voltage signal corresponding to the pan angle. The servo amplifier 21A indicates a pan angle input via the analog input terminal 25. A drive signal is output to the motor 21B so that the analog signal (voltage signal) matches the voltage signal detected by the potentiometer 21C. Note that the tilt drive unit 22, the zoom drive unit 23, and the focus drive unit 24 are configured in the same manner as the pan drive unit 21.
[0013]
Also, pan angle data, tilt angle data, zoom position data, and focus lens position data are stored in advance in the memory 14 corresponding to the shot number so that a desired shot is possible, and the button group 11D of the operation unit 11 is stored. By selecting a shot number with the, pan angle data, tilt angle data, zoom position data and focus lens position data corresponding to the shot number can be read from the memory 14 and output via the D / A converter 13. ing.
[0014]
Further, pan angle data, tilt angle data, zoom position data, and focus lens position data can be output from the serial terminal 17 via the communication interface 15.
Next, details of the operation unit 10 according to the present invention will be described.
The operation unit 10 is different from the conventional operation unit 1 shown in FIG. 3 mainly in the processing of the CPU 12 and the storage contents of the memory 14.
[0015]
That is, the memory 14 has a time delay from when the position signal is output from the operation unit 10 to each of the drive units 21 to 24 until each drive unit 21 to 24 reaches the position indicated by the commanded position signal. The transfer function is stored for each drive unit. This transfer function can be obtained by actually driving each drive unit.
The CPU 12 has, for example, a digital filter corresponding to each of the driving units 21 to 24, and a filter coefficient corresponding to a transfer function stored in advance in the memory 14 is set in each digital filter. And when transmitting the digital signal equivalent to the voltage value of the potentiometer of each drive part to the computer 30, while simultaneously outputting a position signal to each of the drive parts 21-24, the signal sequence of the position signal (position data) and Then, a digital signal to which a delay in each driving unit is added is calculated by a convolution operation with a filter coefficient of the digital filter. The digital signals corresponding to the current pan angle data, tilt angle data, zoom position data, and focus lens position data thus obtained are sent from the serial terminal 17 to the computer 30 via the communication interface 15.
[0016]
In this embodiment, the case where the input signal is delayed using the digital filter has been described. However, the present invention is not limited to this, and any digital signal that is delayed by the delay in the drive unit can be obtained by calculation. It may be a thing. Further, from the serial terminal, a serial signal that does not add a delay as described above can be output to the photographing apparatus via, for example, a modem, a relay box, or the like.
[0017]
【The invention's effect】
As described above, according to the present invention, the digital signal indicating the current position is calculated from the commanded position signal in consideration of the delay element of the drive unit of the remote control pan head or the drive unit of the photographing apparatus, and this is calculated. Since the digital signal is transmitted to the computer, an A / D converter that converts the voltage value of the potentiometer indicating the current position of the remote control pan head and the drive unit of the photographing apparatus into a digital signal is not required, thereby reducing costs and saving space. Can be achieved. Further, there is an advantage that it is possible to cope with a system already sold by only changing the program.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a system to which an operation unit according to the present invention is applied.
FIG. 2 is a block diagram showing a main configuration of the system shown in FIG. 1;
FIG. 3 is a conventional system configuration diagram.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Operation unit 11 ... Operation part 12 ... Central processing unit (CPU)
DESCRIPTION OF SYMBOLS 13 ... D / A converter 14 ... Memory 15 ... Interface 16 ... Analog output terminal 17 ... Serial terminal 20 '... Imaging device 21 ... Pan drive part 21A ... Servo amplifier 21B ... Motor 21C ... Potentiometer 22 ... Tilt drive part 23 ... Zoom drive Unit 24 ... Focus drive unit 30 ... Computer

Claims (3)

In the operation unit of the photographing apparatus that outputs a position signal indicating a control target value to the driving unit of the remote control pan head and the driving unit of the photographing apparatus mounted on the remote control pan head,
For the position signal, a digital signal to which a delay from when the position signal is output until the drive unit reaches the position indicated by the position signal is calculated in advance and synchronized with the output of the position signal to the drive unit. An operation unit of the photographing apparatus, wherein the calculated digital signal is transmitted to a computer. In the operation unit of the photographing apparatus that outputs a position signal indicating a control target value to the driving unit of the remote control pan head and the driving unit of the photographing apparatus mounted on the remote control pan head,
Storage means for storing for each driving unit a transfer function with a time delay from when the position signal is output until the driving unit reaches the position indicated by the position signal;
An arithmetic means for calculating a digital signal corresponding to the current position of the drive unit based on the position signal and a transfer function of the drive unit corresponding to the position signal;
An operation unit of a photographing apparatus comprising: output means for transmitting to the computer a digital signal calculated by the calculation means for the position signal in synchronization with an output of the position signal to the drive unit . The operation unit of the photographing apparatus according to claim 1 or 2, wherein the position signal includes a signal for instructing a pan angle and a tilt angle of the remote control pan head and a signal for instructing a zoom position and a focus lens position of the photographing apparatus.

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