JPH0650908B2 - Image division multiplexing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image multiplexing apparatus that multiplexes two television (hereinafter abbreviated as TV) camera outputs on one screen for transmission.

[Conventional technology]

Conventionally, an image division multiplexing circuit that divides and multiplexes image signals output from two TV cameras into one screen is used to subordinately synchronize two TV cameras with the same black burst signal and
Each output image signal of the camera is made the same phase, input to the image multiplexing circuit, and the signal of the synchronization circuit output is used as a reference,
One image signal was cut out from the first half field of the field, and the other image signal was cut out from the second half field of the field, and one screen was multiplexed (for example, Journal of the Television Society, Vol. 36, No. 6, P484-485). reference).

[Problems to be solved by the invention]

In the conventional image division multiplexing circuit described above, it is necessary to set the subject to be cataloged so that one TV camera can see it in the upper half of the monitor, and the other camera can show it in the lower half of the monitor. Instead, the TV camera had to be set each time. Also, when the multiplexed image is displayed on the TV monitor, the viewpoints are taken for one TV camera imaged in the upper half field of the TV monitor and the other camera imaged in the lower half field. There was a problem that there was a gap.

The present invention provides an image division multiplexing system which solves the above problems of the conventional one.

[Means for solving problems]

According to the present invention, the image signals output from two TV cameras are
A black burst signal generator that outputs two types of black burst signals having a phase difference of about 1/2 of the vertical synchronization period and 2N times the horizontal synchronization period (N is an integer) in a television system that is divided and multiplexed on the screen. , Two TV cameras operating dependent on the output of the black burst signal generator,
A synchronization detection circuit for synchronously detecting from one of the image signals output from the two TV cameras, and an image signal having an earlier phase of the image signals output from the two TV cameras is set to about 1 of the vertical synchronization cycle. The delay circuit delays the horizontal synchronization period by 2N times at / 4, and the image multiplexing circuit that selectively multiplexes the image signals output from the two TV cameras and the delay circuit output. The image signal of each half field of the center of the screen of the output image signal and the vertical synchronization signal cut out from the image signal of the delay circuit output are decomposed and multiplexed into one image signal with reference to the output of the synchronization detection circuit. An image division multiplexing method is provided.

〔Example〕

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

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention. In this figure, 1 is a black burst signal generator that outputs a black burst signal, and 21 and 22 are TVs.
A camera, 3 is an image multiplexing circuit for multiplexing image signals, 4 is a delay circuit for delaying an input image signal, 5 is a synchronization detection circuit for detecting a synchronization signal from the image signal, and 6 is an output terminal.

The black burst signal generator 1 has a phase difference of about 1/2 of the vertical synchronization period and 2N times the horizontal synchronization period (N is an integer).
The two black burst signals a and b are output to the TV cameras 21 and 22, respectively. TV cameras 21, 22
Outputs image signals c and d that are phase-synchronized with the input black burst signals a and b. Image signal c, d
Is input to the image multiplexing circuit 3, and the image signal c (referred to as c in this embodiment) preceded by the vertical synchronization signal is input to the delay circuit 4 and the synchronization detection circuit 5. The delay circuit 4 delays the input image signal c by about 1/4 of the vertical synchronization period and 2N times the horizontal synchronization period, and outputs it as an image signal e to the image multiplexing circuit 3. The synchronization detection circuit 5 detects a synchronization signal from the input image signal c, separates it into a vertical synchronization pulse f and a horizontal synchronization clock h, and outputs the vertical synchronization pulse f and the horizontal synchronization clock h to the image multiplexing circuit 3. To do. In the image multiplexing circuit 3, the image signals c and d are referenced to the vertical synchronizing pulse f input from the synchronizing separation circuit 5,
The central half fields of the image signals c and d of the output of 22 and the vertical synchronizing signal section of the image signal e of the output of the delay circuit 4 are cut out and divided and multiplexed into one image signal.

FIG. 2 shows a configuration example of the image multiplexing circuit 3 shown in FIG. In this figure, 31 is a multiplexing circuit, 32 is a multiplexing control signal m, n using a horizontal synchronizing clock h and a vertical synchronizing pulse f.
Is a control circuit for outputting. The control circuit 32 counts the horizontal sync clock h based on the vertical sync pulse f output from the sync detection circuit 5, and outputs the multiplexing control signals m and n to the multiplexing circuit 31. The multiplexing circuit 31 cuts out the vertical synchronizing signal sections of the image signals of the central half field of the image signals c and d and the image signal e by the multiplexing control signals m and n, divides and multiplexes them into one image signal, and outputs the output terminal 6 Output more.

Next, the operation of the circuits shown in FIGS. 1 and 2 will be described with reference to FIGS. Here, the operation of multiplexing the image signals c and d that are phase-synchronized with the black burst signals a and b into one image signal will be described. FIG. 3 shows the phase relationship of each signal in one vertical synchronization section of the image signal, and FIG. 4 shows the phase relationship in one horizontal cycle section in an enlarged manner. Reference symbols a and b are black burst signals output from the black burst signal generator, and the black burst signal b is output in a phase relationship delayed from the black burst signal a by about 1/2 field (section from T ₀ to T ₂ ). . However, the time from T ₀ to T ₂ is 1/2 of the vertical sync cycle.
Is 2N times the horizontal synchronization period (N is an integer). C is TV
The output image signal of the camera 21 and d is the output image signal of the TV camera 22. The image signal c is in phase synchronization with the black burst signal a, and the image signal d is the black burst signal b.
It is in phase synchronization with.

Further, the signal a'b'c'd 'in FIG. 4 is an enlarged view of one horizontal period of the black burst signals a and b and the image signals c and d. Since the horizontal synchronizing signal and the color synchronizing signal of the black burst signal a and the black burst signal b are output in the same phase, the output signals c and d of the TV cameras 21 and 22 which are phase-locked depending on the black burst signals a and b. Has the same phase for both the horizontal synchronizing signal and the color synchronizing signal.
The image signal c output from the TV camera 21 and the image signal d output from the TV camera 22 are input to the multiplexing circuit 31 in the image multiplexing circuit 3, and the image signal c preceded by the vertical synchronization is the delay circuit 4. It is input to the synchronization detection circuit 5. In the delay circuit 4, the image signal c is input to about 1/4
Then, the signal is delayed by 2N times the horizontal synchronization period (section from T ₀ to T ₁ ) and output as the image signal e to the multiplexing circuit 31 inside the image multiplexing circuit.

The sync detection circuit 5 separates the sync signal from the image signal e,
A vertical synchronizing pulse f, which is a positive pulse having a line width once in two fields, and a horizontal synchronizing clock h having a rising edge at a falling point of the horizontal synchronizing signal, which is a rectangular wave having one horizontal synchronizing period, are supplied to the image multiplexing circuit 3 Output to the internal control circuit 32.
The control circuit 32 counts the horizontal synchronizing clock h based on the input vertical synchronizing pulse f and outputs the multiplexing control signals m and n to the multiplexing circuit 31.

The multiplexing circuit 31 selectively multiplexes the image signals c and d and the delayed image signal e by the multiplex control signals m and n. First, in the sections from T ₁ to T ₃ and T ₁ ′ to T ₃ ′, the multiplex control signal m is set to the low level and the multiplex control signal n is set to the high level, and the vertical synchronizing signal section of the delayed image signal e is In the sections T ₃ to T ₄ and T ₃ ′ to T ₄ ′, both the multiplex control signals m and n are set to low level, and the central portions T ₃ to T ₄ and T ₃ ′ of the field of the image signal c are selected. To T ₄ ′
Section is selected, the multiplex control signal m is set to high level and the multiplex control signal n is set to low level in the section from T ₄ to T ₅ and T ₄ ′ to T ₅ ′, and the central half of the image signal d is set. Fields T ₄ to T ₅ and T ₄ ′ to T ₅ ′ are selected,
The multiplexed and multiplexed image signal g is output from the output terminal b.

〔The invention's effect〕

As is clear from the above description, the present invention has two TVs.
By cutting out the central part of each screen of the camera and multiplexing them on one screen, the camera captures the target subject so that it is located at the center of the screen, and no special adjustment of the camera position is required. Also, since the images of the central part of the screens of the two TV camera outputs are cut out, there is an effect that a good screen can be provided without the viewpoint shift of the person reflected in the two screens.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention,
2 is a block diagram showing an example of the multiplexing circuit in FIG. 1, FIG. 3 is a time chart for explaining the phase relationship of signals in one vertical synchronization section, and FIG. 4 is a signal in one horizontal cycle section. It is a time chart for explaining a phase relation. In the figure, 1 is a black burst signal generator, 21, 22
Is a TV camera, 3 is an image multiplexing circuit, 31 is a multiplexing circuit,
32 is a control circuit, 4 is a delay circuit, and 5 is a synchronization detection circuit.

Claims (1)

[Claims] 1. In a television system in which image signals output from two television cameras are divided and multiplexed into one screen, the mutual phase difference is about 1/2 of the vertical synchronizing period and 2N times (N) the horizontal synchronizing period.
Is an integer), a black burst signal generator that outputs two types of black burst signals, two television cameras that operate depending on the outputs of the black burst signal generator, and image signals that are output from the two television cameras. A sync detection circuit for synchronously detecting from one of the two, and an image signal of which the phase is ahead among the image signals of the two TV cameras output is delayed by about 1/4 of the vertical synchronization cycle and 2N times the horizontal synchronization cycle. And a delay circuit and an image multiplexing circuit that selectively multiplexes the image signals output from the two TV cameras and the output from the delay circuit. The image signals output from the two TV cameras are arranged at the center of the screen. It is possible to selectively multiplex into one image signal with reference to the half-field image signal, the vertical synchronizing signal cut out from the image signal output from the delay circuit, and the output from the synchronization detecting circuit. Image division multiplexing to symptoms.