JPH09116898A - Video signal transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of reproduced picture quality without a time difference in respective video signals by temporarily accumulating the video signals from plural television cameras and encoding and transmitting them as one screen. SOLUTION: The video signals from the television cameras 11 -14 are temporarily accumulated in the memories 41 -44 . Control parts 51 -54 control the writing and reading of the memories 41 -44 . A selection part 6 selects the video signals which are read from the memories 41 -44 corresponding to the plural television cameras 11 -14 and constitutes one screen. Then, an encoding part 7 encodes the video signals constituting one screen from the selection part 6 and transmits them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal transmission system for band-compressing and transmitting a video signal for transmission.
Various systems have already been proposed and standardized as band compression encoding of video signals. There is a demand for efficient high-resolution video observation on the monitor side by efficiently band-compressing and transmitting even video signals obtained by imaging a subject with a plurality of television cameras.

[0002]

2. Description of the Related Art FIG. 13 is an explanatory view of a conventional example using a plurality of lines. 101 _{1 to} 101 ₄ are television cameras and 102
_{1 to} 102 ₄ are video signal encoding devices, and 103 _{1 to} 103
₄ transmission line 104 ₁ to 104 ₄ is the video signal decoding apparatus, 105 ₁ to 105 ₄ represents a monitor, a television camera 101 _{1-101 4-compatible} monitor 105 _{1-105 4,} the video signal also each Transmission lines 103 _{1 to} 103
It is encoded via ₄ and transmitted.

The video signal is encoded by the H.264 standard. 261, MPE
Are those G1, standardized bandwidth compression coding such as MPEG2 is employed, the television camera 101 _{1-101 4}
Video signals from the video signal encoding device 102.
_{1 to} 102 ₄ are converted into digital signals, and a luminance signal Y and color difference signals Cb (= BY) and Cr (= RY) are obtained.
(However, B = blue signal, R = red signal) are separated, inter-frame difference or intra-frame difference is taken, two-dimensional discrete cosine transform (DCT) is applied, and then quantized, and variable length code is applied to the transmission line. 103 sends the ₁ to 103 _4.

[0004] In the video signal decoding apparatus 104 ₁ to 104 _4, decoded by the video signal encoding apparatus opposite the processed image signals, respectively In addition to the monitor 105 _{1-105 4,} the television camera 101 ₁ The image picked up by 101 ₄ is displayed.

[0005] Figure 14 is an explanatory view of a conventional example in which the divided coded transmission time, 111 ₁ to 111 ₄ is a television camera, 1
12 is a video signal encoding device, 113 is a transmission line, 114
Is a monitor, 116 is a selection unit, 117 is an AD conversion unit (A /
D), 118 is a luminance / color difference signal separation unit (Y / C), 11
Reference numeral 9 is an encoding unit.

The video signal encoding unit 112 shows the case where the video signals from the plurality of television cameras 111 _{1 to} 111 ₄ are time-division processed, and the selection unit 116 selects the video signal for the time-division processing. It is a thing. Then, the encoding unit 1
The video signal encoded at 19 is transmitted through one transmission line 113.

On the receiving side, the video signal decoding device 114 performs time-division decoding, demultiplexes and displays the selected video signal in addition to the monitor 115, or displays images by the TV cameras 111 _{1 to} 111 ₄ by screen division. The screen can be displayed.

[0008]

In the case of the configuration shown in FIG. 13 of the conventional example, the video signal encoding devices 102 _{1 to} 102 ₄ corresponding to the television cameras 101 _{1 to} 101 ₄ and the transmission line 103 are provided.
_{1 to} 103 ₄ and video signal decoding devices 104 _{1 to} 104 ₄
Since there is a need for and, there is a problem that the cost increases.
Further, since there is a difference in the time required for encoding and decoding and the transmission delay time in each system, there is a problem in that even if the images have the same time, the images displayed on the monitors 105 _{1 to} 105 ₄ have a time difference. There is.

Further, in the case of the configuration shown in FIG. 14, since a plurality of television cameras 111 _{1 to} 111 ₄ are provided with one encoding unit 119 and a transmission line 113, comparison with the case of FIG. Therefore, the cost can be reduced, and the video signals from the plurality of television cameras 111 _{1 to} 111 ₄ can be transmitted without causing a time difference. However, since the encoding is performed by the time-division processing, a frame drop occurs due to the processing speed of the video signal encoding device 112,
There is a problem that the playback image quality deteriorates. SUMMARY OF THE INVENTION It is an object of the present invention to transmit video signals from a plurality of television cameras without causing a time difference and prevent deterioration of reproduced image quality.

[0010]

Means for Solving the Problems A video signal transmission system of the present invention, a video signal encoding apparatus for delivering encodes the video signal from the (1) the TV camera 1 ₁ to 1 _4, the encoded video signal decoded and a picture signal decoding apparatus is added to the monitor 11, a memory 41 _{to 4} for temporarily storing the video signal from the TV camera 1 ₁ to 1 _4, the memory 4
Control units 5 _{1 to} 5 for controlling writing and reading of ₁ to 4 _4
4 and multiple TV cameras 1 ₁ to 1 ₄ compatible memory 4 ₁
A selection unit 6 that selects one of the video signals read from 4 to ₄ to form one screen, and an encoding unit 7 that encodes and sends the video signal that forms one screen from the selection unit 6. .

(2) 1 encoded by the encoder 7
A decoding unit 9 which decodes received via the transmission line 8 a video signal which constitutes the screen, a video signal TV camera 1 ₁ to 1 ₄ constituting the one screen decoded by the decoding unit 9
A separation unit that separates the corresponding reduced screen, an interpolation unit that interpolates the reduced screen separated by this separation unit to return to the original size screen, and a video signal that is interpolated by this interpolation unit are added. And a monitor for displaying.

[0012] (3) In addition to comparing the frequency of each synchronization with that signal into a plurality of television cameras 1 ₁ to 1 ₄ of the video signal, a clock signal synchronized with the highest frequency of the video signals, a plurality of television cameras 1 ₁ to 1 ₄ corresponding memory 4 ₁
It is possible to provide a clock generation unit that uses 4 ₄ common read clock signals.

(4) Further, the control units 5 _{1 to} 5 ₄ cut out portions requiring high resolution into areas corresponding to the size to be selected and output as a reduced screen from the selection unit, and memories 4 ₁ to _{4 4}
The video signal read from the memories 4 ₁ to 4 ₄ and added to the selection unit 6 can be provided.

(5) Further, the memories 4 ₁ to 4 ₄ are provided with first and second memory units having a storage capacity of at least one frame, and the control units 5 _{1 to} 5 ₄ are the memories 4 ₁ to _{4 4.} In synchronization with the vertical synchronizing signal of the video signal input to the
It is possible to provide a configuration for controlling switching of writing and reading of a video signal to and from the memory unit.

(6) Further, the memories 4 ₁ to 4 ₄ include a panoramic memory portion and a partial memory portion, and the control portions 5 _{1 to} 5
₄ performs an image signal memory ₄₁ to ₄ in the writing and reading control, using a memory unit for panoramic reads the video signal as a reduced picture by thinning for bandwidth compression coding, partial memory part The selection unit 6 selects a video signal from the panoramic memory unit and a video signal from the partial memory unit by reading the video signal without thinning out the area of the size of the reduced screen using. It is possible to provide a configuration for outputting a video signal that forms one screen.

[0016] (7) The motion detecting a large part of the movement of the video signal, the video signal which constitutes a predetermined size partial screen of which is centered about the portion is cut by using the memory 4 _{1-4 4} A detector can be provided.

(8) Further, control units 5 _{1 to} 5 ₄ are provided on the monitor 11 side.
It is possible to provide a setting unit for setting and sending parameters such as a screen cutout range according to, and for receiving the parameters from the setting unit and providing an interface unit for controlling the control units 5 _{1 to} 5 ₄ .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a first embodiment of the present invention, showing a case where _four TV cameras 1 ₁ to ₁₄ are provided, and 2 ₁ to 2 ₄ are AD converters (A / D) 3 _{1 to} 3 ₄ are luminance / color difference signal separation units (Y / C), 4 ₁ to 4 ₄ are memories, 5 _{1 to} 5 ₄ are control units, 6 is a selection unit, 7 is an encoding unit,
Reference numeral 8 is a transmission line, 9 is a decoding unit, 10 is a DA conversion display control unit (D / A), and 11 is a monitor.

AD converters 2 ₁ to 2 ₄ , luminance / color difference signal separation units 3 _{1 to} 3 ₄ , memories 4 ₁ to 4 ₄ , and control unit 5 ₁
5 ₄ a, and the selector 6, the encoding unit 7 constitutes a video signal coding apparatus, and a decoding unit 9, to constitute a video signal decoding apparatus by a DA converter display control unit 10 There is.

The video signal from the TV camera ₁ 1 to 1 _4, the AD conversion unit 21 _{to 24} is converted into a digital signal, a luminance signal Y and color difference signals Cb by luminance and color difference signal separator 3 ₁ to 3 ₄ , is separated into Cr becomes digital component signal is added to the memory 4 _{1-4 4,}
It is written by the control of the control unit 5 ₁ to 5 _4, the control of the selector 6 and the control unit 5 ₁ to 5 _4, the television camera 1 ₁
The screens corresponding to 1 to ₄ are reduced screens each having a reduced area of 1/4, and the video signals forming one screen as a whole are selectively output and encoded in addition to the encoding unit 7.

As described above, the encoding unit 7 is an H.264 / AVC encoder. 26
1, MPEG1, MPEG2, etc., having a configuration for performing encoding in accordance with a standardized band compression encoding method,
The encoding process can be performed by a dedicated hardware configuration, or the encoding process can be performed by software using a general-purpose computer. Then, the encoded video signal is sent to the transmission line 8. Therefore, since band compression encoding is performed as a video signal for one screen, frame drop does not occur, transmission can be performed by one line, and there is no time difference between reduced screens, which causes economical degradation of reproduced image quality. Can be suppressed.

The decoding section 9 has a structure for decoding by the reverse processing of the coding method in the coding section 7, and the DA conversion display control section 10 converts the decoded video signal into an analog video signal. Then, it is displayed in addition to the monitor 11. In this case, one screen is divided into _four , and the image pickup screens corresponding to the television cameras 1 ₁ to 14 are displayed.

FIG. 2 shows the screen composition of the first embodiment of the present invention.
It is explanatory drawing and (a)-(d) is the television camera 1.₁~
1_FourCorresponding imaging screens are shown, each of which is, for example, 72
It has a 0 × 480 pixel configuration. Also, (e) to (h) are belts
It is reduced by thinning processing for area compression encoding.
For example, thinning processing is performed every other pixel and every other horizontal scanning line.
As a result, a reduced screen of 360 × 240 pixels is formed.
And the control unit 5₁~ 5 _FourAnd memory by the selection unit 6.
4₁~ 4_FourVideo signal is read from the TV camera 1₁
~ 1_FourFor example, one screen with a 720 x 480 pixel configuration
The configuration result is shown in (f). Configure this one screen (f)
The video signal to be encoded is encoded by the encoding unit 7 and transmitted.
Sent out on line 8. Reduction in one screen (f) in this case
The arrangement of the screens (e) to (h) is limited to the illustrated case.
It is not a thing, and various changes can be made as necessary.
You. TV camera 1₁~ 1_FourCorresponding reduced screen (e) ~
(H) is transmitted as one screen, so the time between them is
There will be no gap.

FIG. 3 is an explanatory diagram of a memory and a control unit according to the embodiment of the present invention, and 21 and 22 are first and second memory units, respectively.
WA is a write address terminal, WE is a write enable terminal, RA is a read address terminal, RE is a write enable terminal, 23 is a write enable signal generator, 24 is a read enable signal generator, 25 is a frame counter,
26 is a line counter, 27 is a pel counter, 28 is a line counter, and 29 is a pel counter.

The above-mentioned memories 4 ₁ to 4 ₄ are composed of first and second memory units 21 and 22, and control units 5 _{1 to} 5 are used.
₄ shows a case in which the write enable signal generation unit 23, the read enable signal generation unit, the frame counter 25, the line counters 26 and 28, and the pel counters 27 and 29 are configured.

By synchronizing with the vertical synchronizing signal VS of the input video signal and counting the write clock signal WCK,
Pel counter 2 forming pixel address on horizontal scan line
7 and a line counter 26 that forms an address of a horizontal scanning line in one screen form a write address for a video signal and apply it to the first and second write address terminals WA. Various means have already been proposed as means for generating such an address, and an appropriate means among them can be applied.

The count content of the frame counter 25 indicates whether it is an odd frame or an even frame, and the write enable signal generation unit 23, for example, in the case of an odd frame, the write enable terminal W of the first memory unit 21.
The write enable signal is applied to E, and the write enable signal is applied to the write enable terminal WE of the second memory unit 22 in the case of an even frame.

Further, the write enable signal generator 23 generates a write enable signal for every one pixel and every one horizontal scanning line according to the write address from the pel counter 27 and the line counter 26. Therefore, in an odd frame, one screen of the input video signal is thinned out and written as a reduced screen having a quarter area in the first memory unit 21, and in an even frame, One screen of the input video signal is thinned out and written in the second memory unit 22. Therefore, for example, 720 × 480
The pixel screen is written as a reduced screen having a 360 × 240 pixel configuration with an area of ¼ of that.

Further, by the pel counter 29 and the line counter 28 to which the read clock signal RCK is added, the read address terminals R of the first and second memory sections 21 and 22 are read.
A read address to be added to A is generated. Further, the read enable signal generation unit 24 outputs the read enable signal to the second memory unit 22 in the frame period in which the write enable signal is applied to the first memory unit 21 by the signal from the write enable signal generation unit 23. In addition, during the frame period in which the write enable signal is applied to the second memory unit 22, the read enable signal is applied to the first memory unit 21.

Therefore, the first and second memory units 21 and 22
The video signal thinned out and written in is read out in synchronization with the write clock signal RCK, and switching between writing and reading in the first and second memory units 21 and 22 is performed in vertical synchronization. Since the switching is performed in synchronization with the signal VS, the switching is not performed in the middle of the frame, and part of the reproduction screen is not lost.

In the above-mentioned embodiment, the read enable signal is generated every other pixel and every other horizontal scanning line,
Video signals are thinned out and written, but it is also possible to write all video signals for one screen, generate write enable signals at every other pixel and every horizontal scanning line, and thin out and read out the video signals. Is.

[0032] FIG. 4 is an explanatory view of a second embodiment of the present invention, ₁ 1 to 1 ₄ are television cameras, the transmission line 8, 9 decoding unit, 10 ₁ to 10 ₄ are DA converting display control Part, 11 ₁
To 11 ₄ monitor, 31 a video signal encoding apparatus, 32 separation section, 33 _to 333 ₄ is an interpolation unit.

The video signal encoding apparatus 31 has a structure of at the video signal encoding apparatus in FIG. 1, therefore, as shown in FIG. 2, a single screen configuration, a video of the television camera 1 ₁ to 1 ₄ The signal is encoded and sent to the transmission line 8. The decoding unit 9 decodes the encoded video signal and adds it to the separation unit 32.
Separation unit 32 separates each reduced screen one screen in FIG. 2 (f) (e) ~ (h) is added to the interpolation section 33 _to 333 _4. Each interpolation unit 33 _to 333 _4, the horizontal accordance interpolation means already known, by performing an interpolation process between the vertical direction of the pixel, the original size as shown in the FIG. 2 (a) ~ (d) Screen, the video signals are added from the DA conversion display control units 10 ₁ to 10 ₄ to the monitors 11 _{1 to} 11 ₄ , and the television camera 1 ₁
To 1 ₄ of the imaging screen displayed. Therefore, there will be no time difference on the display screens of the monitors 11 _{1 to} 11 ₄ .

FIG. 5 is an explanatory view of the third embodiment of the present invention, in which the same reference numerals as those in FIG. 1 designate the same parts, 41 is a cycle detecting section, and 42 is a clock selection output section. Constitutes a clock generator by a the period detector 41 and the clock selecting unit 42, period detector 41, a vertical synchronizing signal of the video signal from the TV camera 1 ₁ to 1 _4, such as a horizontal synchronizing signal The cycle of the signal synchronized with the video signal is detected, and the video signal of the fastest cycle is detected. When the CLK1~CLK4 TV camera 1 ₁ to 1 ₄ corresponding clock signal, the clock selecting portion 42, and selectively outputs the clock signal of the television camera for outputting a video signal of the fastest cycle, the controller It is added to 5 _{1 to} 5 ₄ as a read clock signal.

Therefore, since the read clock signal faster than the write clock signal is read from the memory in which the video signal other than the fastest cycle is written, the video signal is read without dropping the frame. be able to. That is, in the memory, since the writing and reading are synchronized with respect to the video signal having the fastest cycle of the signal synchronized with the video signal, frame drop does not occur, and other slow With respect to the video signal having a cycle, the writing cycle is slow, but the reading cycle is fast, so that in this case as well, frame drop does not occur.

[0036] Figure 6 is a third explanatory diagram of the period detector and clock selecting unit of the embodiment of the present invention, the period detection portion 41 in FIG. 5, the synchronization signal counter unit 43 ₁ to 43 ₄ and comparison circuit 44 is shown. Also, the synchronization signal counting unit 4
3 _{1-43 4} vertical respectively synchronizing signal VS1~VS4
Has a counter 45 for counting and a latch circuit 46. The timing signal from the timing signal generator 47 is applied to the counter 45 as a reset signal and to the latch circuit 46 as a latch signal.

Assuming that the cycle of the timing signal from the timing signal generator 47 is 1 second, for example, the synchronization signal counter 4
3 _{1-43 4} counter 45 counts one second vertical synchronizing signals VS1-VS4, latched in the latch circuit 46 performs a magnitude comparison at the count contents latched in the comparator circuit 44, the maximum value Identify vertical sync signal,
The clock selection output unit 42 is controlled. For example, when the count value of the vertical synchronization signal VS2 becomes maximum, the clock selection output unit 42 selectively outputs the clock signal CLK2 as the read clock signal CLK.

In the above-described embodiment, the clock generator is
TV camera ₁ 1 to 1 ₄ correspondence of the vertical synchronization signal VS1~V
Although the case where each S4 is counted is shown, the horizontal synchronizing signals can be counted and compared. It is also possible to count and compare the periods of the burst signals. That is,
The period can be measured by selecting various signals synchronized with the video signal. Further, the clock selection output unit 42 of the clock generation unit is a phase synchronization circuit, and the comparison circuit 44 generates the read clock signal CLK that is phase-synchronized with the synchronization signals such as the vertical synchronization signals VS1 to VS4 having the maximum count value. You can also do it.

FIG. 7 is an explanatory view of the fourth embodiment of the present invention, in which 1 is a television camera, 2 is an AD converter (A / D), 3
Is a luminance / color difference signal separation unit (Y / C), 4A is a panoramic memory unit, 4B is a partial memory unit, 5A and 5B are control units, and 6
Is a selection unit, 7 is an encoding unit, 8 is a transmission line, 9 is a decoding unit, 10 is a DA conversion display control unit (D / A), 11 is a monitor, and 33 is an interpolation unit.

The panoramic memory unit 4A and the control unit 5A read out the video signal for one screen of the television camera 1 as the video signal of the reduced screen by the thinning-out process and send it to the selection unit 6 as in the above-described embodiments. In addition, the partial memory unit 4B and the control unit 5B cut out a region in one screen that requires high resolution without thinning out, write a video signal, and read the video signal to select it. Add to Part 6. In this case, for example, by continuously generating the write enable signal from the write enable signal generation unit 23 in FIG. 3 from the start address to the end address on the horizontal scanning line of the cutout area, The video signal can be written in the partial memory unit 4B.

The selection unit 6 controls the selection so that the high-resolution area read from the partial memory 4B is inserted into the reduced screen read from the panoramic memory unit 4A to form one screen, and the encoding unit is selected. Band compression coded by 7 and transmission line 8
To send to. The decoding unit 9 receives this encoded video signal.
In the DA conversion display control unit 10, the interpolating unit 33 performs decoding between pixels, and the interpolating unit 33 performs inter-pixel interpolation processing to obtain the original one screen.
Is converted into an analog video signal and added to the monitor 11.

FIG. 8 is an explanatory diagram of cutout synthesis of the screen portion according to the embodiment of the present invention. FIG. 8A shows an image pickup screen of the television camera 1, which has, for example, a 720 × 480 pixel configuration.
For example, a region indicated by a dotted line that requires high resolution is cut out as illustrated in (b) with a 180 × 120 pixel configuration or a 90 × 60 pixel configuration that is smaller than the size of the reduced screen described above. Further, one screen of (a) is a reduced screen of, for example, a 360 × 240 pixel configuration shown in (c) by thinning processing by the panoramic memory 4A and the control unit 5A.

The selecting section 6, for example, as shown in (d),
The video signals read from the panoramic memory section 4A and the partial memory section 4B are selected so as to fit a high-resolution area in the panoramic screen, thereby forming one screen. In the above case, 360
A high-resolution area of 180 × 120 pixel configuration or 90 × 60 pixel configuration is embedded in a reduced screen of × 240 pixel configuration and a video signal in which one screen is configured is encoded and transmitted. Therefore, the monitor 11 displays, for example, (d)
A high-resolution area indicated by a dotted line can be displayed in a P-in-P (picture-in-picture) format.

FIG. 9 is an explanatory diagram of screen cutout according to the embodiment of the present invention. FIG. 9A shows an image pickup screen of the television camera 1 similar to the above case, for example, one screen of 720 × 480 pixel configuration. When only a part indicated by a dotted line in the figure is transmitted with high resolution, it is cut out as shown in (b) as a reduced screen size of 360 × 240 pixel configuration, and is skipped from the selection unit 6 without performing thinning processing. In addition to 7, it encodes.

On the monitor 11, the reduced screen of (b) is restored to the original size of one screen, so that it is displayed in a high resolution state. It is to be noted that a case where a reduced screen is obtained by the thinning processing is shown in FIG.
It is restored to the screen size and displayed as shown in (a). In this case, the thinning processing and the interpolation processing deteriorate the image quality compared to the image quality not subjected to the thinning processing.

FIG. 10 is an explanatory view of the fifth embodiment of the present invention, in which 1 is a television camera, 2 is an AD converter (A / D),
3 is a luminance / color difference signal separation unit (Y / C), 4 is a memory, 5
Is a control unit, 6 is a selection unit, 7 is an encoding unit, 8 is a transmission line,
9 is a decoding unit, 10 is a DA conversion display control unit (D / A),
11 is a monitor, 33 is an interpolation unit, and 50 is a motion detection unit.

In this embodiment, an area including a large motion portion is cut out and transmitted at high resolution. The motion detecting section 50 has a predetermined size of, for example, 8 × 8 pixels or 16 × 16 pixels. The inter-frame difference is obtained for each of the areas, the area having the largest difference is determined to be a portion having a large movement, and the selecting unit 6 is controlled so as to cut out the portion with the center as the center.

FIG. 11 is an explanatory view of cutting and combining of moving parts according to the fifth embodiment of the present invention, in which the image pickup screen of the television camera 1 is shown in (a), and 8 × 8 pixels like 51 or 52 are shown. Alternatively, the inter-frame difference is obtained for each area of a predetermined size such as 16 × 16 pixels. Then, the shaded area 51
If the inter-frame difference is the largest, a region 53 having a size corresponding to a reduced screen with the region 51 as the center is cut out as shown in (b).

This area 53 is encoded and transmitted without thinning processing. Therefore, when received and decoded and displayed on the monitor 11, as shown in FIG. It becomes a high resolution screen, and it becomes possible to observe detailed movements.

FIG. 12 is an explanatory view of the sixth embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same parts, 61 is a setting section, 62 is a signal line, and 63 is an interface section. As with the embodiment shown in FIG. 1, the monitor 11, in the configuration that simultaneously display the reduced image of the imaging screen of the television camera 1 ₁ to 1 _4, the setting unit 61 to the TV camera 1 ₁ -
The parameters for selecting 1 ₄ and setting the cutout area are set and sent out via the signal line 62.
The reception processing is performed in step S3 to control the control units 5 _{1 to} 5 ₄ . In addition, the signal line 62 uses the bidirectional transmission function of the transmission line 8,
Alternatively, it can be laid as a separate line as shown.
Also known is a method of controlling the imaging range of the TV camera 1 ₁ to 1 ₄ remotely, it can be used a wired or wireless signal lines for transmitting such remote control signals.

For example, the television camera 1 using the monitor 11
₁ to 1 ₄ imaging screen during observation, either when only the desire to observe high resolution specific part of the image pickup plane of a single television camera occurs, the setting unit 61, to specify the television camera, Moreover, the parameter for specifying the cutout portion is set and transmitted. As the transmission format in this case, various known data transmission methods can be applied. The interface unit 63 receives the parameter, and adds the cutout region designation information to the control unit corresponding to the designated TV camera. As a result, as described above, the designated area is cut out, encoded and transmitted without being thinned out, so that a high-resolution image can be displayed.
It is also possible to instruct to cut out a region including a portion having a large movement.

It is possible to combine the above-mentioned respective embodiments. For example, even in the reduced screens of (e) to (h) of FIG. 2, the parts that require high resolution are cut out and the screens are combined, or in the imaging screens of (a) to (d). It is also possible to cut out a region requiring a high resolution or a region having a large movement, and combine the screens without performing the thinning process.

The transmission line 8 and the signal line 62 may be a wired line, a wireless line, or an optical transmission line for transmitting as an optical signal. The interface between the selection unit 6 and the encoding unit 7 is usually a digital interface, but it may be an analog interface if necessary. The monitor 11 shows a case where the one or the television camera 1 ₁ to 1 ₄ corresponding number, it is also possible to further provide a number of monitors.

[0054]

As described above, according to the present invention, the memory 4 _1-a video signal from a plurality of television cameras 1 ₁ to 1 ₄
4 ₄ temporarily stores, reads the respective reduced image, in which encoding and transmitting by the encoding unit 7 constitute one screen by the selection unit 6, the encoding unit of 1 line video signal of a plurality of systems 7, band compression coded and transmitted, and 1
The base of the monitor 11 or television camera 1 ₁ to 1 ₄ compatible monitor 11 ₁ to 11 _4, it is possible to obtain a display screen the time difference of the imaging screen of the television camera 1 ₁ to 1 ₄ does not occur, the observation by multiple television cameras Can be accurately and economically possible.

Further, by cutting out a region requiring a high resolution such as a portion having a large motion, and encoding and transmitting it without performing thinning processing, the monitor 11 observes the motion of the subject on a high resolution display screen. There is an advantage that can be done.

[0056] The remote control of the television camera 1 ₁ to 1 ₄ are already known, in response to such a remote control, by setting the parameters of the region and the like cut into setting unit, requires a high-resolution There is an advantage that it is possible to specify the area to be observed and observe with the monitor 11.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of screen compositing according to the first embodiment of this invention.

FIG. 3 is an explanatory diagram of a memory and a control unit according to the embodiment of this invention.

FIG. 4 is an explanatory diagram of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a third embodiment of the present invention.

FIG. 6 is an explanatory diagram of a cycle detection unit and a clock selection output unit according to a third embodiment of the present invention.

FIG. 7 is an explanatory diagram of a fourth embodiment of the present invention.

FIG. 8 is an explanatory diagram of cutout composition of a screen portion according to the embodiment of this invention.

FIG. 9 is an explanatory diagram of screen cutout according to the embodiment of this invention.

FIG. 10 is an explanatory diagram of the fifth embodiment of the present invention.

FIG. 11 is an explanatory diagram of cutout synthesis of a moving portion according to the fifth embodiment of the present invention.

FIG. 12 is an explanatory diagram of a sixth embodiment of the present invention.

FIG. 13 is an explanatory diagram of a conventional example using a plurality of lines.

FIG. 14 is an explanatory diagram of a conventional example that performs time division coded transmission.

[Explanation of symbols]

1 ₁ to 1 ₄ television camera 2 ₁ to 2 ₄ AD conversion section _{(A / D) 3 1 ~3} 4 luminance and color difference signal separator _{(Y / C) 4 1 ~4} 4 memory 5 ₁ to 5 ₄ control unit 6 Selection unit 7 Encoding unit 8 Transmission line 9 Decoding unit 10 DA conversion unit (D / A) 11 Monitor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Tahara 3-22-8 Hakataekimae, Hakata-ku, Fukuoka City, Fukuoka City, Fujitsu Kyushu Digital Technology Co., Ltd. (72) Inventor Masaru Inoue, Hakata-ku, Fukuoka City, Fukuoka Prefecture Hakata Ekimae 3-22-8, Fujitsu Kyushu Digital Technology Co., Ltd. (72) Inventor Otsuru Ha, Hakata-ku, Fukuoka, Fukuoka Hakata Ekimae 3-22-8, Fujitsu Kyushu Digital Technology Co., Ltd.

Claims (8)

[Claims] 1. A video signal transmission system comprising: a video signal coding device for coding and sending a video signal from a television camera; and a video signal decoding device for decoding the coded video signal and adding it to a monitor. , A memory for temporarily storing video signals from the TV camera, a control unit for controlling writing and reading of the memory, and a screen for selecting video signals read from the memories corresponding to the plurality of TV cameras. 2. A video signal transmission system, comprising: a selection unit that configures the above; and a coding unit that encodes and sends a video signal that configures one screen from the selection unit. 2. A decoding unit that receives and decodes a video signal that constitutes one screen encoded by the encoding unit, and a video signal that constitutes the one screen decoded by the decoding unit. A separation unit that separates a reduced screen compatible with a television camera, an interpolation unit that interpolates the reduced screen separated by the separation unit to return to a screen of an original size, and a video signal that is interpolated by the interpolation unit. 2. The video signal transmission system according to claim 1, further comprising a monitor for displaying each of them. 3. The frequencies of the signals respectively synchronized with the video signals of the plurality of television cameras are compared, and the clock signal synchronized with the video signal of the highest frequency is used as a common clock of the memories compatible with the plurality of television cameras. 2. A clock generation unit for using a read clock signal is provided.
The described video signal transmission system. 4. The control unit cuts out a portion requiring high resolution into an area corresponding to a size to be selected and output as a reduced screen from the selection unit, writes the cutout area in the memory, and outputs a video signal read from the memory. The video signal transmission system according to claim 1, further comprising a configuration added to the selection unit. 5. The memory includes first and second memory units having a storage capacity of at least one frame, and the control unit synchronizes with a vertical synchronization signal of a video signal input to the memory. 5. The video signal transmission system according to claim 1, 3 or 4, further comprising a configuration for controlling switching between writing and reading of the video signal to and from the first and second memory units. 6. The memory includes a panoramic memory section and a partial memory section, and the control section controls the writing and reading of a video signal to and from the memory and uses the panoramic memory section. And a configuration for reading the video signal as a reduced screen by thinning out for band compression encoding, and using the partial memory unit to read out the video signal for a region smaller than the size of the reduced screen without thinning out, The selection section includes a configuration for selecting a video signal from the panoramic memory section and a video signal from the partial memory section and outputting a video signal forming one screen. 1. The video signal transmission system according to 1. 7. A motion detection unit for detecting a portion of the video signal in which the motion is large, and cutting out a video signal forming a partial screen of a predetermined size with the portion substantially at the center by using the memory. The video signal transmission system according to claim 1, wherein the video signal transmission system is provided. 8. A setting unit is provided on the monitor side for setting and transmitting parameters such as a screen cutout range by the control unit, and an interface unit for receiving the parameters from the setting unit and controlling the control unit. The video signal transmission system according to claim 1, 2 or 4 or 6 or 7, wherein the video signal transmission system is provided.