JPH05145951A - Image pickup data transmitting system - Google Patents

Abstract

PURPOSE:To economize only the data transmitting quantity without lowering picture quality in the case of transmitting stereoscopic image data from a satel lite to a ground station. CONSTITUTION:One of paired source signals S1 and S2 is defined as the reference source signal S1, a signal dt1 expressing time difference and a signal ds1 expressing level difference to the same observing object corresponding point of the other source signal (sub source signal) S2 to this reference source signal are generated on the transmission side, and these signals S1, dt1 and ds1 are multiplexed and transmitted by a multiple transmission circuit 8. The data quantity of these time difference signal dt1 and level difference signal ds1 is made one-dozens in comparison with that of the source signal. On the other hand, a receiving signal S2r2 corresponding to the sub source signal is reproduced by correcting the time difference and level difference of the reference source signal on the reception side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image pickup system for picking up the same observation target from a plurality of observation points at different angles using an artificial satellite or a relay station, and more particularly to relaying a data signal picked up by an artificial satellite. The present invention relates to a method of transmitting to a ground station via a station or directly.

[0002]

2. Description of the Related Art In a system that images various phenomena on the ground surface from an artificial satellite and transmits them to the ground, or a system that retransmits them to each receiving station after being received by a data relay satellite or a main receiving station on the ground. Initially, the signal picked up by the transmitting side was transmitted to the receiving side as it was.

However, with the progress of high-resolution observation, the amount of imaged data becomes enormous.
With the addition of a stereoscopic imaging function from satellites, the amount of imaging data is increasing further.

For this reason, it becomes difficult to transmit these signals as they are due to restrictions on the satellite body side, etc., and there is no choice but to reduce the number of imaging bands, which has a great impact on the imaging performance. ..

Therefore, the adoption of a data compression method for compressing the stereoscopic image pickup data to reduce the amount of data transmitted from the satellite body is being considered.

[0006]

However, in the conventional data compression method adopted on the ground, usually, the image data is not independently correlated with each other, but individually compressed and transmitted. The device configuration is quite complicated. Therefore, it is difficult to use such a method as a data compression method for mounting on a satellite due to restrictions of power, size, and weight, and it is difficult to secure strict quality as a high-precision image for the compressed image. Considering that it is required, there are many problems in applying this as it is.

On the other hand, as a simple system configuration, there is, for example, a predictive coding system, but this system has a problem that the amount of transmission data saved is small.

An object of the present invention is to solve the above-mentioned problems, and more specifically, an imaging data signal transmission system capable of reducing the amount of transmitted data without deteriorating the image quality of high resolution stereoscopic imaging data. To provide.

[0009]

In order to solve the above-mentioned problems, the present invention is a method used in a stereoscopic imaging system for imaging the same observation target from different observation points at different angles. A primary signal processing circuit that is provided corresponding to each data signal and that converts each imaging data signal into an electric signal to generate a plurality of original signals, and a transmitting unit that transmits these original signals toward a transmission path. And a receiving means for reproducing the imaging data signal received from the transmission path and guiding it to the image processing apparatus, wherein any one of the plurality of original signals is used as a reference original signal. When the original signal adjacent to the reference original signal and the original signal adjacent to this original signal are defined as sub-original signals, and the transmitting means expresses a time difference with respect to the same observation target corresponding point between the adjacent original signals. A time difference detection circuit for generating a difference signal; a primary transmission reproduction circuit for generating a primary transmission signal having a waveform approximate to the sub-original signal based on the reference original signal and the time difference signal; A level difference detection circuit that generates a level difference signal representing the level difference between the next transmission signal and the actual sub original signal, and the reference original signal, the time difference signal, and the level difference signal are multiplexed and sent to the transmission path. And a receiving / distributing circuit for separating the reference original signal, the time difference signal, and the level difference signal from the multiplexed signal received from the transmission path,
A primary reception / reproduction circuit for reproducing the same primary reception signal as the primary transmission signal based on the reference original signal and the time difference signal, a reproduced primary reception signal and the level difference signal And a secondary reception / reproduction circuit for generating a secondary reception / reproduction signal representing the sub-signal based on

When stereoscopic imaging is performed with a fixed time difference from a moving object, a delay circuit for providing a predetermined delay time to the reference original signal input to the transmitting means is provided.

When the time difference between the original signals is large and the required delay time cannot be provided on the side of the moving object, a relay station is provided, and the time difference detection circuit and the primary transmission reproduction are provided in this relay station. A circuit, a level difference detection circuit, and a multiplex transmission circuit are provided.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 is a signal processing system diagram of an imaging data signal transmission system according to a first embodiment of the present invention, (a) is a transmission side system diagram, and (b) is a reception side system diagram. Show. In the figure, for convenience of explanation, a pair of stereoscopic image pickup signals S1 and S2 are provided.
2 shows a configuration for transmitting the.

In FIG. 1A, reference numerals 1a and 1b are light receiving elements for obtaining an image signal, and here, a one-dimensional CCD (charge coupled device) will be mainly described.

The image signals converted into the electric signals by the light receiving elements 1a and 1b are the primary signal processing circuits 2a and 2a, respectively.
Guided to 2b.

In the primary signal processing circuits 2a and 2b, the input pixel signal is amplified, the waveform is corrected, the A / D conversion is performed, etc.
Normal signal processing required for transmission is performed to generate a pair of stereoscopic imaging original signals (hereinafter, simply referred to as original signals) S1 and S2. One original signal S1 serves as a reference for subsequent signal processing, and is hereinafter referred to as a reference original signal. The other original signal S2 is referred to as a sub-original signal in order to distinguish it from the reference original signal S1.

In a system having a data compression circuit for independently compressing or saving the output signals of the light receiving elements 1a, 1b, these compression circuits also belong to the category of the primary signal processing circuits 2a, 2b referred to here. include.

Reference numeral 3 is a delay circuit for correcting the time difference T when three-dimensional imaging is performed with a certain time difference T from a moving object such as an artificial satellite or an aircraft with respect to the reference original signal S1. Is a circuit for giving a required delay time (T).

The sub-original signal S2 and the reference original signal S1 passed through the delay circuit 3 are input to the transmission signal processing section 4.

The transmission signal processing section 4 comprises a time difference detection circuit 5, a primary transmission reproduction circuit 6 and a level difference detection circuit 7.

The time difference detection circuit 5 detects the time difference between the pair of original signals S1 and S2 for the same observation target corresponding point, and outputs the time difference signal dtl representing this time difference to the transmission reproduction circuit 6 together with the reference original signal S1. Output.

In the primary transmission reproduction circuit 6, the time difference signal dt1 is added to each pixel data of the input reference original signal S1.
Is given to the level difference detection circuit 7 as a primary transmission signal S2r1 that approximates the sub-original signal S2.

The sub-original signal S2 from the time difference detection circuit 5 is also input to the level difference detection circuit 7, where the level difference signal ds1 representing the level difference between the two input signals is generated and sent to the multiplex transmission circuit 8. Output.

In the multiplex transmission circuit 8, this level difference signal d
s1 and the time difference signal dt output from the transmission reproduction circuit 6
1 and the reference original signal S1 are multiplexed and sent to the receiving station.

In the application example of the artificial satellite, the multiplex transmission circuit 8 also includes a large-capacity data recorder, a high-power transmitter, and the like.

Next, the structure of the receiving side will be described with reference to FIG.

The multiplexed signal transmitted from the transmission side is separated into a reference original signal S1, a time difference signal dt1 and a level difference signal ds1 by the reception distribution circuit 9 and distributed to each circuit of the reception signal processing unit 10.

The reception signal processing unit 10 is configured to have a primary reception / reproduction circuit 11 and a secondary reception / reproduction circuit 12 having the same configuration and function as the primary transmission / reproduction circuit 6. There is.

In the primary receiving / reproducing circuit 11, as in the transmitting side, based on the reference original signal S1 and the time difference signal dt1,
A time difference is given to each pixel data of the reference original signal S1 to reproduce the same primary reception signal S2r1 as the primary transmission signal,
This is output to the secondary reception / reproduction circuit 13.

In the secondary reception / reproduction circuit 13, the primary reception signal S2r1 and the level difference signal ds1 distributed from the reception distribution circuit 9 are added, and the secondary reception signal identical to the sub-original signal S2 is added. The S2r2 is reproduced and output to the image processing device 13.

The image processing device 13 performs various image processes for use by the user based on the secondary reception signal S2r2 and the reference original signal S1 output from the primary reception / reproduction circuit 11. ..

Next, the operating principle of the time difference detection circuit 5 will be described with reference to FIGS.

FIG. 2 is a diagram showing the principle of stereoscopic imaging, and shows the case of observing a conical imaging object M as an example.

When imaging is performed from two points A1 and A2 which are apart from each other, when the object has a perfect planar shape, the imaged mutual data are in principle the same signal, and points P and R are the same.
Is similarly imaged at each of the observation points A1 and A2, and is output at the positions of P1, R1 and P2, R2, respectively.

On the other hand, when there is a predetermined altitude difference with respect to the plane to be imaged as at point Q in FIG.
It is observed by shifting from 1 to the position of Q1 and from A2 to the position of Q2.

FIG. 3 is a signal waveform diagram of each part using this as an example of satellite image data. (A) is a waveform of original signals S1 and S2 which are stereoscopically imaged and a time difference signal dt1 waveform, and (b) is a primary waveform. Reception signal S2r1 waveform and level difference signal ds1 waveform,
(C) shows the secondary reception signal S2r2 waveforms, respectively. In the figure,
The vertical axis represents the level of each signal, and the horizontal axis represents time. Although the original signals S1, S2, etc. are often converted into digital signals in practice, they are described here as analog signals for convenience of description.

In FIG. 3A, the reference original signal S1 represented by the solid line.
When there is a difference in altitude between the image pickup targets, each point is shifted to the position of each point of the sub-original signal S2 shown by the broken line and output. Therefore, the time difference signal dt1 between the respective original signals S1 and S2 is obtained by obtaining the time difference between each point of the reference original signal S1 and the corresponding point indicating the same level in the sub original signal S2 or a level close to this. Be done.
Since the time difference signal dt1 has a large correlation between the original signals S1 and S2, it usually has an extremely low signal level as compared with the original signals S1 and S2.

This time difference signal dt1 is input to the primary transmission / reproduction circuit 6, and a time difference is given to each pixel data of the reference original signal S1. That is, assuming that the pixel number is i, S1 [i
By performing the calculation of −dt1 [i]], FIG.
The primary reception signal S2r1 having the waveform shown in is obtained. This signal S
The waveform of 2r1 is extremely close to the sub-original signal S2.

The primary received signal S2r1 and the sub-original signal S2
Are input to the level difference detection circuit 7 and the subtraction processing as shown in the following equation (1) is performed to obtain the level difference signal ds
Get one.

Ds1 [i] = S2 [i] −S2r1 [i] = S2 [i] −S1 [i-dt1 [i]] (1) This level difference signal ds1 is also as shown in FIG. 3B. To
The signal has a very small level as compared with the sub original signal S2.

A multiplexed signal including these signals S1, dt1, and ds1 is sent to the receiving side, and first, the reference original signal S1 and the time difference signal dt1 are input to the primary receiving and reproducing circuit 11.
Similarly to the above, by performing the arithmetic processing of S1 [i-dt1 [i]], the primary reception signal S2r1 is reproduced, and the addition of this and the level difference signal ds1 is performed by the secondary reception reproduction circuit 12
By doing so, as shown in FIG. 3 (c) and the following (2), the secondary received signal S that matches the waveform of the sub-original signal S2.
2r2 can be played.

S2r2 [i] = S2r1 [i] + ds1 [i] = S2r1 [i] + {S2 [i] −S2r1 [i]} = S2 [i] (2) FIG. 4 shows the image pickup of this embodiment. It is a system application conceptual diagram in the case of carrying out stereoscopic imaging by an artificial satellite orbiting the earth using a data signal transmission system and transmitting to a ground station.

In FIG. 4, 14 is an earth observation satellite, and 15a, 1
5b is a condensing optical system, 16 is a transmitting antenna, and 17 (17
a, 17b) is the ground surface of the imaging target, and 18 is the ground station.

First, the light collecting optical systems 15a and 15b mounted on the earth observation satellite 14 image the ground surfaces 17a and 17b, and form images on the light receiving elements 1a and 1b to convert them into electric signals. Is done. As described above, these electric signals are input to the primary signal processing circuits 2a and 2b, amplified,
A / D conversion and other processing are performed.

Here, assuming that the distance interval for imaging the same target point is B and the relative moving speed between the satellite and the ground surface is v, the delay circuit 3 outputs T = B / v to the output signal of the front light receiving element 1a.
Of the transmission signal processor 4 as a set of original signals S1 and S2 together with the output signal of the rear light receiving element 1b.
Entered in.

Hereinafter, as described with reference to FIGS. 1 to 3, the time difference signal dt1 and the level difference signal ds1 are detected, and the multiplexed signal including these signals dt1, ds1 and the reference original signal S1 is transmitted from the multiplex transmitter 8. Ground station 1 via antenna 16
8 is transmitted.

In the ground station 18, the multiplexed signal is input to the reception signal processing unit 10 via the reception distribution circuit 9. Hereinafter, as described above, the secondary reception signal S2r2 equal to the sub-original signal S2 is reproduced from the multiplexed signal and output to the image processing device 13 together with the reference original signal S1. (Second Embodiment) FIG. 5 is a signal processing system diagram of an imaging data signal transmission system according to a second embodiment of the present invention, (a) showing a transmitting side system diagram, and (b) showing a receiving side system diagram. .. In addition, FIG.
FIG. 3 is a conceptual diagram when observing a conical imaging target M according to the present embodiment.

In this embodiment, stereoscopic imaging is performed from two points separated at the same time, and in this case, the delay circuit 3 shown in FIGS. 1 and 4 becomes unnecessary. In this case, as in the first embodiment, it is of course possible to use one-dimensional CCDs as the light receiving elements 1a and 1b, but in the present embodiment, the two-dimensional CCD is used for imaging.

First, referring to FIG. 5, the light receiving element 1a,
The output signal 1b passes through the primary signal processing circuits 2a and 2b to form a set of original signals S1 and S2, which are directly input to the transmission signal processing unit 4. The configuration and operation of the transmission signal processing unit 4 are the same as those shown in FIG. 1, and after detecting the time difference signal dt1 and the level difference signal ds1 based on the input signal, the multiplex transmission circuit 8 converts them into multiplexed signals. Then, it is transmitted to the receiving side.

As shown in FIG. 5B, the signal processing on the receiving side is exactly the same as the signal processing by the configuration of FIG. 1B, and the primary reception is performed by the reference original signal S1 and the time difference signal dt1. After reproducing the signal S2r1, this primary received signal S2
The secondary reception signal S2r2 corresponding to the sub-original signal S2 is reproduced by the r1 and the level difference signal ds1, and the image processing device 1
Input to 3. (Third Embodiment) FIG. 7 is a signal processing system diagram of an imaging data signal transmission system according to a third embodiment of the present invention, (a) showing a transmitting side system diagram, and (b) showing a receiving side system diagram. .. Also, FIG.
[FIG. 3] is an explanatory diagram of stereoscopic imaging according to the present embodiment, conceptually showing a case where the same object is imaged from three distant points.

As described above, the stereoscopic imaging requires observation from at least two points apart from each other.
When observing from an artificial satellite, there are cases where imaging is performed from three or more distant positions, particularly for reasons such as improvement in measurement accuracy.

FIG. 8 illustrates this state, and shows a case where an image is taken at the point directly below in addition to the front and rear images. It should be noted that, although this drawing shows an example in which a plurality of CCDs are arranged in this image forming plane with a common condensing optical system, the signal processing operation is performed by the plurality of condensing optical systems shown in FIG. Is the same as when using.

In FIG. 7 and FIG. 8, the light receiving elements 1a ...
The output signal of 1c is input to the transmission signal processing unit 4 via the primary signal processing circuits 2a to 2c and the delay circuits 3a and 3b.

Here, if the distance between the front imaging light receiving element 1a and the rear imaging light receiving element 1c imaging the same observation object 17a is B, and the relative moving speed between the satellite and the object is v, the delay circuit The required delay time of 3a is T = B / v as in the case of the first embodiment.

The distance between the front imaging light-receiving element 1a and the direct-down direction light-receiving element 1b for imaging the same observation object is B / 2, and the delay time required by the delay circuit 3b is T / 2.
Becomes

Original signals S1, S2, S3 that have passed through these primary signal processing circuits 2a-2c and delay circuits 3a, 3b.
Is input to the transmission signal processing unit 4. In this embodiment, the first original signal S1 is the reference original signal.

The process of inputting the reference original signal S1 and the sub signal S2 to the time difference detection circuit 5a to obtain the time difference signal dt1 and further outputting the level difference signal ds1 by the transmission reproduction circuit 6a and the level difference detection circuit 7a is as shown in FIG. It is exactly the same as the case.

Hereinafter, the time difference signal dt1 will be referred to as a first time difference signal, and the level difference signal ds1 will be referred to as a first level difference signal.

The second time difference signal dt2 is obtained by the time difference detection circuit 5b from the adjacent sub original signals S2 and S3 by the same process, and the second transmission signal S3r1 is obtained from this signal dt2 and the sub original signal S2. Is played.

The second transmission reproduction signal S3r1 and the sub-original signal S3 are input to the level difference detection circuit 7b, and the second level difference signal ds2 is output.

The multiplex sending circuit 8 multiplexes the reference original signal S1, the first time difference signal dt1, the first level difference signal ds1, the second time difference signal dt2, and the second level difference signal ds2, and receives them. Send to the side.

On the receiving side, as shown in FIG. 7 (b), the received distribution circuit 9 receives the reference original signal S from the received multiplexed signal.
1, time difference signals dt1, dt2, level difference signal ds1,
It is separated into ds2 and distributed to each circuit of the reception signal processing unit 10.

The process of reproducing the secondary reception signal S2r2, which is equal to the sub-original signal S2, from each of the signals S1, dt1, ds1 is as follows.
This is exactly the same as the case of the first embodiment.

In order to reproduce the adjacent sub original signal S3, the secondary received signal S2r2 reproduced as described above is equal to the sub original signal S2. Therefore, this secondary received signal S2r2 is reproduced.
And the second time difference signal dt2 are input to the second primary reception / reproduction circuit 11b to reproduce the primary reception signal S3r1, and further the primary reception signal S3r1 and the second level difference signal d.
By adding s2 to the secondary reception / reproduction circuit 12b, the secondary reception signal S equal to the adjacent sub original signal S3 is obtained.
Can play 3r2. (Fourth Embodiment) FIG. 9 is a system diagram of an imaging data signal transmission system according to a fourth embodiment of the present invention, in which a set of stereoscopic imaging signals imaged and transmitted by a satellite is retransmitted or The structure when recording is shown.

This configuration is used when there is a large time difference between the stereoscopically picked-up signals and a required delay time difference cannot be given in a small satellite.

In the figure, 14 is an earth observation satellite, 19 is a main reception distribution station which is a relay station, 21 is a transmission line, and 22 is a receiving station.

In the earth observation satellite 14, the primary signal processing circuits 2a and 2a
The output of b is multiplexed by the multiplex sending circuit 8 and sent to the main reception distribution station 19 as it is.

The main receiving / distributing station 19 comprises a receiving / separating circuit 20, a delay circuit 3, a transmission signal processing section 4 and a multiplex sending circuit, and the stereoscopic image pickup data separated by the receiving / separating circuit 20 is delayed by the delay circuit 3. The transmission signal processing unit 4 produces a set of original signals S1 and S2 by applying a predetermined delay time difference to each other and performing time correction.
To enter. In the transmission signal processing unit 4, as described above, the reference original signal S1, the time difference signal dt1, and the level difference signal d.
s1 is generated and input to the multiplex transmission circuit 8. The multiplex sending circuit 8 multiplexes these signals and sends them to the receiving station 22 using the transmission line 21.

The transmission line 21 may be a wireless transmission line such as satellite relay or a wire transmission line such as an optical cable. Further, it is apparent from the configuration of this embodiment that the present invention can be applied to the case of once recording on a recorder such as a magnetic tape.

The receiving station 22 has the same configuration and operation as the receiving side system diagram described above, and reproduces the secondary received signal S2r2 equal to the sub-original signal S2.

The case where the reception station 22 and the main reception distribution station 19 are configured in a one-to-one relationship has been described above.
In some cases, transmission is performed from the main reception distribution station 19 in multiple directions. In this case, a plurality of reception stations 22 having the same configuration and operation are installed as shown by the broken line.

Further, although the main receiving / distributing station 19 is shown as an example of a ground station in this embodiment, it is clear that it can be applied to a case where it is installed on a large-scale satellite platform such as a space station. Is.

[0072]

As described above in detail, in the present invention,
Instead of the conventional method of transmitting a plurality of original signals as they are, the correlation between these original signals is taken, and any one of the reference original signals and the time difference signal and level difference signal with respect to this original signal are transmitted. Therefore, the amount of data sent to the receiving side can be reduced. Normally, the time difference signal and the level difference signal are 1/10 to 1/10 of the original signal.
The amount of data is about the same, and the effect is enormous.

Further, as shown in the equations (1) and (2), there is no error due to the reduction of the data transmission amount, and the original signal can be completely restored on the receiving side.

As described above, according to the present invention, it is possible to provide an image pickup data signal transmission system capable of greatly reducing the data transmission amount without impairing the image quality of high-quality stereoscopic image data.

[Brief description of drawings]

FIG. 1 is a signal processing system diagram of an imaging data signal transmission system according to a first embodiment of the present invention, in which (a) is a transmission side system diagram,
(B) is a receiving side system diagram.

FIG. 2 is a diagram showing the principle of stereoscopic imaging according to the first embodiment of the present invention, and shows the case of observing a conical imaging target M as an example.

FIG. 3 is a signal waveform diagram of each part in which satellite image data is taken as an example in the first embodiment of the present invention, in which (a) is a stereoscopically captured original signal S1 and S2 waveform and a time difference signal dt1 waveform.
(B) shows the primary reception signal S2r1 waveform and the level difference signal d
s1 waveform, (c) is the secondary reception signal S2r2 waveform.

FIG. 4 is a system application conceptual diagram in the case of performing stereoscopic imaging by an artificial satellite orbiting the earth using the imaging data signal transmission system according to the first embodiment of the present invention and transmitting the stereoscopic imaging to a ground station.

FIG. 5 is a signal processing system diagram of an imaging data signal transmission system according to a second embodiment of the present invention, (a) is a transmission side system diagram,
(B) is a receiving side system diagram.

FIG. 6 is a conceptual diagram for observing a conical imaging target M according to the second embodiment of the present invention.

FIG. 7 is a processing system diagram of an imaging data signal transmission system according to a third embodiment of the present invention, (a) is a transmission side system diagram,
(B) is a receiving side system diagram.

FIG. 8 is an explanatory diagram of stereoscopic imaging according to the third embodiment of the present invention, and is a diagram conceptually showing a case where the same object is imaged from three distant points.

FIG. 9 is a system system diagram of an imaging data signal transmission system according to a fourth embodiment of the present invention, which is a configuration for retransmitting or recording a set of stereoscopic imaging signals imaged and transmitted by a satellite. It is the figure which showed.

[Explanation of symbols]

 1a, 1b, 1c Light receiving element (CCD) 2a, 2b, 2c Primary signal processing circuit 3, 3a, 3b Delay circuit 4 Transmission signal processing unit 5, 5a, 5b Time difference detection circuit 6, 6a, 6b Primary transmission Reproduction circuit 7, 7a, 7b Level difference detection circuit 8 Multiplexing circuit 9 Reception distribution circuit 10 Reception signal processing unit 11, 11a, 11b Primary reception / reproduction circuit 12, 12a, 12b Secondary reception / reproduction circuit 13 Image processing device 14 Earth Observation Satellites 15, 15a, 15b Condensing Optical System 16 Transmission Antennas 17, 17a, 17b Imaging Target Surface 18 Ground Station 19 Main Reception Distribution Station (Relay Station) 20 Reception Separation Circuit 21 Transmission Line 22 Reception Station

Claims (3)

[Claims] 1. A method used in a stereoscopic imaging system for imaging the same observation object from different observation points at different angles, the method being provided in correspondence with each of the plurality of imaging data signals. A primary signal processing circuit for converting each to an electric signal to generate a plurality of original signals, a transmitting means for transmitting these original signals to a transmission line, and a reception unit for reproducing the imaging data signal received from the transmission line. In the imaging data signal transmission method having means, any one of the plurality of original signals is a reference original signal,
The original signal adjacent to this reference original signal and the original signal sequentially adjacent to this original signal are used as sub-original signals, and the transmitting means generates a time difference signal representing a time difference between adjacent original signals with respect to the same observation target corresponding point. A time difference detection circuit for generating, a primary transmission reproduction circuit for generating a primary transmission signal having a waveform approximate to the sub-original signal based on the reference original signal and the time difference signal, and the primary transmission signal Level difference detection circuit for generating a level difference signal representing the level difference between the actual sub-source signal and the actual sub-source signal, and multiplex transmission for multiplexing the reference original signal, the time difference signal and the level difference signal and transmitting the multiplexed signal to the transmission path. A receiving distribution circuit for separating the reference original signal, the time difference signal, and the level difference signal from the multiplexed signal received from the transmission line, and the reference original signal. A primary reception / reproduction circuit for reproducing the same primary reception signal as the primary transmission signal based on the time difference signal, and the primary reception / reproduction circuit based on the reproduced primary reception signal and the level difference signal. An imaging data signal transmission system, comprising at least a secondary reception / reproduction circuit for generating a secondary reception / reproduction signal representing a sub-signal. 2. The image pickup data signal transmission method according to claim 1, further comprising a delay circuit which gives a predetermined delay time to at least one original signal which is input to the transmission means and which serves as a reference for the time difference. And image data transmission method. 3. A method used in a stereoscopic imaging system for imaging the same observation target from different observation points at different angles, the method being provided in correspondence with each of the plurality of imaging data signals. A primary signal processing circuit for converting each to an electric signal to generate a plurality of original signals, and a primary transmitting means for transmitting these original signals to a relay station are mounted on a moving body, and Each original signal transmitted from the next transmitting means, in the imaging data signal transmission method for transmitting to the receiving station via the relay station, one of the plurality of original signals as a reference original signal,
The original signal adjacent to the reference original signal and the original signal successively adjacent thereto are made into sub-original signals, and the primary transmission means multiplexes the output of the primary signal processing circuit and sends it to the relay station. The relay station includes a first multiplex sending circuit, and the relay station is a receiving / separating circuit that separates the reference original signal and the sub-original signal from the multiplexed signal sent from the first multiplex sending circuit. A delay circuit for giving a predetermined delay time to the reference original signal, a time difference detection circuit according to claim 1, a primary transmission reproduction circuit,
And a level difference detection circuit, and a second multiplex transmission circuit that multiplexes the reference original signal, the time difference signal, and the level difference signal and sends the multiplexed signal to the receiving station, wherein the receiving station further comprises: 1. An image pickup data signal transmission system comprising at least the reception distribution circuit according to 1, the primary reception reproduction circuit, and the secondary reception reproduction circuit.