JP2697102B2 - 4-split screen display TV camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a four-screen television camera, and more particularly to a four-screen television camera.
The four camera heads and the controller for controlling the operation of the camera heads are separated from each other by 4
The output image of one camera head unit is transmitted to the display unit via the controller unit, and the images from the four camera heads are joined and displayed in a 4-split screen display, or the full-screen display of the image of any one camera head The present invention relates to a four-split screen display television camera that performs one-screen display in a format.

[Conventional technology]

Conventionally, this type of four-split screen display television camera transmits the video output of each television camera via one dedicated transmission path, and therefore the video output of the four television cameras is four video outputs. Is transmitted by using the transmission path of.

[Problems to be Solved by the Invention] Since the image transmission in the above-described conventional four-split screen display television camera requires one transmission path for each camera head, the transmission path between the camera head section and the controller section is required. However, there is a drawback that the cost increases as the length of the transmission line increases, and at the same time, the construction work of the transmission line becomes difficult.

Also, if the video signals of the two camera heads are time-division multiplexed every horizontal scanning period or every field, only half the number of transmission paths is required, which can reduce the cost and simplify the installation work. However, there is a disadvantage that the vertical resolution is reduced to half when viewing an image of any one camera head unit in full screen display.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned drawbacks, reduce the number of transmission paths to two, and suppress a decrease in the vertical resolution of a full-screen display image of any one camera head unit. Is to provide.

[Means for solving the problem]

The four-split screen display television camera of the present invention displays images taken by four camera heads adjacent to each other.
In a four-split screen display television camera that performs one-screen display by split-screen display or full-screen display of any one image of four camera heads, four camera heads are connected to two camera heads.
In the case of four-screen display, video signals captured by the two camera heads of each of the two sets are switched every horizontal scanning period, and the two sets of each set are time-division multiplexed. The data is transmitted via two transmission paths arranged corresponding to each other, and in the case of one-screen display, the image is switched through an arbitrary one camera head and transmitted via the two transmission paths. It comprises image sending means.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 (A) is a configuration diagram of an embodiment of a camera head of a four-split screen display television camera of the present invention, and FIG. 1 (B).
1 is a configuration diagram of an embodiment of a controller unit of a four-split screen display television camera of the present invention.

The camera head shown in FIG. 1A is composed of four camera heads A1, B2, C3, and D4. These four camera heads are two each of camera heads A1, B2 and camera heads C3, D4. It is operated in two sets.

The camera head A1 and the camera head C3 have the same configuration, and the camera head B2 and the camera head D4 have the same configuration.The camera heads A1 and C3 have imaging circuits A6 and B16 and a video signal processing circuit.
A7, B17, switching circuits A8, B18, drive circuits A9, B19, synchronization signal generation circuits A10, B20, and determination circuits A11, B21, of which the switching circuits A8, B shown by bold lines
18, synchronization signal generation circuits A10, B20, and judgment circuits A11, B21
Is a part directly related to the present invention, and also shows two transmission paths 15 and 25 for each set for image transmission.

The camera heads B2 and D4 include imaging circuits C12 and D22, video signal processing circuits C13 and D23, and driving circuits C14 and D24. In the configuration described above, the portions other than those indicated by the thick lines have the same contents as the conventional one.

The controller section 5 shown in FIG. 1 (B) includes a synchronization signal separation circuit A26, an output circuit A27, a controller synchronization signal generation circuit 28, an A / D converter 29, a digital processing circuit 30,
-A converter 31, synchronization signal separation circuit B32, output circuit 3
3, comprising a camera output control circuit 34 and a video switching circuit 35, in which the pair of synchronization signal separation circuits A26, B32, output circuits A27, B33, and camera output control circuit 34 indicated by a thick line The other components are the same as those of the related art in the directly related portions.

Next, the operation of the embodiment shown in FIGS. 1A and 1B will be described.

According to the camera output selection signal 341 input to the camera output control circuit 34 and the video switching circuit 35 of the controller unit 5, the four-split screen display mode or the camera heads A1, B
One of the single-screen display modes for displaying an arbitrary one of the three screens, C2 and D4, on the full screen is selected.

The camera output control circuit 34 outputs a camera output control signal corresponding to the mode selected at this time to the controller synchronization signal generation circuit 28. Controller synchronization signal generation circuit 28
Is the first for synchronizing camera heads A1, B3, C2 and D4.
A vertical synchronization pulse indicating the start of a field and a camera output control signal for obtaining a video signal selected by the camera output selection signal 341 from the camera head are input once per frame via the transmission lines 15 and 25. Is superimposed on the video signal input to the controller 5. At this time, the camera output control signal is output from the camera head A1 or the camera head A1 in the single screen display mode.
When B3 is selected, the signal is superimposed on the 10th hour from the fall of the vertical synchronization pulse, and on the 11th hour when the camera head C2 or D4 is selected. Here, H indicates the first horizontal scanning time. For example, the 10th H designates the 10th scanning line. In the case of the four-split screen display mode, the camera output control signal is not superimposed.

FIG. 2 shows an example when the vertical synchronization pulse 103 and the camera output control signal 104 are superimposed on the video signals 101 and 102 output from the camera heads A1 and C2. 105 is a horizontal synchronization pulse.
Hereinafter, the flow of signal processing of the pair of camera heads A1 and C2 will be described.

The vertical synchronization pulse and the camera output control signal sent to the camera head A1 via the transmission path A15 are input to the determination circuit A11 and the synchronization signal generation circuit A10.

The determination circuit A11 detects the 10th and 11th hours from the fall of the vertical synchronization pulse, and when there is a camera output control signal at the 10th hour, the switching circuit A8 outputs a control signal to switch to the camera head A1 side. When there is a camera output control signal in the eyes, the control signal is output to switch to the camera head C2 side. When there is no camera output control signal at the 10th and 11th hours, the switching circuit A8 outputs a control signal to alternately switch between the camera head A1 side and the C2 side every one horizontal scanning period. The synchronization signal generation circuit A10 generates a synchronization signal necessary for the camera head in synchronization with the input vertical synchronization pulse.

Now, it is assumed that the four-split screen display mode is selected by the camera output selection signal 341. The video signals of the camera heads A1 and C2 are output from the imaging circuit A6 and the imaging circuit C12 to the video signal processing circuit A7 and the video signal processing circuit C13, respectively, and subjected to signal processing such as amplification and DC reproduction. Output to A8. At this time, the imaging circuits A6 and C12
Are completely synchronized with each other because they are scanned by driving circuits A9 and C14 driven by the synchronizing signal output of the same synchronizing signal generating circuit A10. In the switching circuit A8, the input video signal processing circuit A7 and the output video signal of the video signal processing circuit B13 are switched every horizontal scanning period by the horizontal synchronization signal output from the synchronization signal generation circuit A10,
A horizontal synchronizing signal is added to the signal and the signal is output to the transmission path 15. The switching timing in this case is set by the synchronizing signal generation circuit A10. The odd lines in the first field output the video signal on the camera head A1 side, and the even lines output the video signal on the camera head C2 side. In the second field,
An odd line outputs a video signal on the camera head C2 side, and an even line outputs a video signal on the camera head A1 side.

The composite video signal shown in FIG. 2 transmitted to the controller 4 via the transmission line A15 is input to the synchronization signal separation circuit A26 and the output circuit A27.

The horizontal synchronizing signal taken out by the synchronizing signal separating circuit A26 is input to a controller synchronizing signal generating circuit 28, and a blanking signal and a composite synchronizing signal synchronized with the horizontal synchronizing signal are output to an output circuit A27.

The output circuit A27 performs signal processing such as pedestal addition, gamma correction, and white clipping, and the processed output is input to the AD converter circuit 29 as a composite video signal.

Next, the camera head A
It is assumed that either 1 or camera head C2 is selected. Video signal processing circuit input to switching circuit A8
As for the output video signal of A7 and the video signal processing circuit C13, the output video signal of the selected camera head side is always output by the control signal of the determination circuit A.

The video signal input to the output circuit A27 via the transmission line A15 is added with a composite video signal after removing the horizontal and vertical synchronization signals and the camera output control signal, and is output to the video switching circuit 35 as a television signal. You.

The above signal processing is exactly the same for the set of camera heads B3 and D4. In the 4-split screen display mode, a composite video signal that switches to the output of camera heads B3 and D4 every one horizontal scanning period is output from output circuit B33 to A. The signal is output to the -D converter 29, and in the one-screen display mode, one video signal of the camera heads B3 and D4 is output to the video switching circuit 35 according to the camera output selection signal 341.

The camera heads A1 and C2 input to the AD converter 29
The composite video signal and the composite video signal of the camera heads B3 and D4 are A / D converted and output to the digital processing circuit 30. The digital processing circuit 30 receives the processing such as the composition of the 4-split screen and the superposition of the character signal, and then the DA converter
The signal is converted back to an analog signal at 31 and added to the composite synchronizing signal, and is output to the video switching circuit 35 as a television signal.
The video switching circuit 35 performs a switching operation to output a video signal selected by the camera output selection signal 341.

With the above operation, the transmission path of the video signal can be reduced by half from the conventional four lines to two lines, and the degradation of the vertical resolution does not occur even when viewing the image of any one camera head.

This means that the video signals of the two camera heads are switched every one horizontal scanning period during the 4-split screen display, so that the vertical resolution of the video signals of each camera head at the input of the controller 5 is reduced by half. However, in the case of the four-split screen display, there is no problem because the image of one camera head unit is always compressed by half, and in the case of the one-screen display, switching in each horizontal scanning period in this method is performed. This is based on the fact that the vertical resolution is not reduced because only the video signal of the camera head to be displayed is transmitted and output.

In this manner, image transmission in which the number of transmission paths is reduced to two can be performed without lowering the resolution.

〔The invention's effect〕

As described above, according to the present invention, when the four camera head units are grouped into two units and a four-split screen is displayed, the video signals of the two camera head units are switched every one horizontal scanning period while The transmission path is reduced to two by transmitting only the video signal of the camera head to be displayed in the case of single screen display by multiplexing and transmitting the image signal. There is an effect that the reduction can be eliminated and the cost can be significantly reduced and the wiring work can be simplified.

[Brief description of the drawings]

FIG. 1A is a configuration diagram of an embodiment of a camera head of a four-split screen display television camera of the present invention, and FIG. 1B is an embodiment of a control section of the four-split screen television camera of the present invention. FIG. 2 is an output signal waveform diagram of a set of camera heads in the embodiment shown in FIGS. 1 (A) and 1 (B). 1 Camera head A, 2 Camera head C, 3
Camera head B, 4 Camera head D, 5 Controller, 6 Imaging circuit A, 7 Video signal processing circuit A, 8 Switching circuit A, 9 Drive circuit A, 10
... Synchronous signal generation circuits A and 11... Judgment circuits A and 12... Image pickup circuits C and 13... Video signal processing circuits C and 14. B, 17 ... Video signal processing circuit B, 18 ... Switching circuit B, 19 ... Drive circuit B, 20 ... Synchronous signal generation circuit B, 21 ... Judgment circuit B, 22 ... Imaging circuit D, 23 ... ... Video signal processing circuit D, 24
... Drive circuit D, 25 transmission line B, 26 synchronization signal separation circuit A, 27 output circuit A, 28 ... controller synchronization signal generation circuit, 29 ... AD converter, 30 ... digital Processing circuit 31, DA converter, 32 Synchronous signal separation circuit B, 33 Output circuit B, 34 Camera output control circuit 35 Video switching circuit

Claims (1)

(57) [Claims] 1. A four-screen display in which images captured by four camera heads are displayed adjacent to each other or a one-screen display of an arbitrary one image of four camera heads is performed on a full screen. In a split screen display television camera, four camera heads operate as a set of two
In the case of screen display, video signals picked up by two camera heads of each two sets are switched every one horizontal scanning period, and are arranged corresponding to each of the two sets by time division multiplexing. Image transmission means for transmitting images via one of the two transmission paths and transmitting and outputting images via the two transmission paths while switching and outputting an image by an arbitrary camera head in the case of one-screen display. Characteristic 4-split screen display television camera.