JP2001054078A - Transmission method and transmission device for sub-band coded analog image - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately reproduce a band-split analog image and also to grasp the outline of the reproduced image in an early stage of reproduction. SOLUTION: An image to be transmitted (code a) undergoes a band splitting operation via an orthogonal mirror image filter at a sub-band coding part 1 and is split into the split images of low and high band components and a split image of only a color component. A data processing part 2 adds a header to the head position of each of those split images to show a head position respectively. Then the split images are modulated at a modulation part 3 and transmitted. At the receiving side, every split image is positioned by referring to its header and then reproduced for synthesizing the split images.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for transmitting an analog image, and more particularly to a transmission method and apparatus for transmitting data using sub-band coding.

[0002]

2. Description of the Related Art Heretofore, when an analog image is transmitted via a wireless line or a priority line, it has been a relatively common method to directly apply a suitable modulation to a single image signal before sending it.

[0003]

However, in the case of a conventional transmission method, the receiving side determines that most of the image is not received in order to determine what an image is like. If you have a lot of trouble and want to quickly determine whether the image is the one you want on the receiving side,
It was not able to respond to this. The present invention has been made in view of the above situation, and provides an analog image transmission method and an analog image transmission apparatus that can easily determine the content of a received image at an early stage. It is another object of the present invention to provide an analog image transmission method and an analog image transmission apparatus that reduce a user's stress in image reproduction. It is another object of the present invention to accurately reproduce a band-divided analog image.

[0004]

In order to achieve the object of the present invention, a sub-band coded analog image transmission method according to the present invention performs a sub-band coded band division on an analog image signal, and A sub-band coded analog image transmission method for transmitting an image signal and performing band synthesis by sub-band decoding to reproduce the image signal. On the transmission side, each divided image signal obtained by the band division is transmitted. At the beginning, a predetermined header for indicating the head position of the divided image is added and sequentially transmitted, while the receiving side determines the head position of each divided image based on the header and performs image synthesis. It is configured as follows.

[0005] In such a configuration, a header for indicating the head position is provided in each subband-coded analog image, so that when the individual images are synthesized on the receiving side, positioning is performed by the header. This makes it easier to accurately reproduce the original image.

In order to achieve the object of the present invention, an analog image transmitting apparatus according to the present invention performs a band division by sub-band coding on an analog image signal and transmits the analog image signal. And a reception processing device that performs band synthesis by sub-band decoding and reproduces an image signal, wherein the transmission processing device is obtained by the band division. At the beginning of each divided image signal, a predetermined header for indicating the beginning position of the divided image is added,
On the other hand, the reception processing device is configured to determine the head position of each of the divided images based on the header and perform image synthesis.

[0007] Such a configuration is suitable for executing the above-described subband-encoded analog image transmission method, in which a header for indicating the head position is added to each subband-encoded analog image. Thus, when combining the individual images on the receiving side, the positioning is facilitated by the header, and the original image can be accurately reproduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention. First, the analog image transmission apparatus, an analog image transmission processing apparatus S _TX, those formed by roughly classified into an analog image reception processing apparatus S _RX, analog image transmission processing apparatus S _TX and the analog image reception processing apparatus S _RX Between
They are connected by a wired transmission line or a wireless transmission line. First, the analog image transmission processing device _STX will be described with reference to FIG. The analog image transmission processing device _STX is for performing subband encoding, which is a well-known and well-known data compression technique, on an analog image and sending it out to a transmission path. The subband encoding unit 1 and the data processing unit 2, a modulation section 3, and a transmission-side color signal processing section 4.

[0009] The format of the analog image itself to be transmitted need not be limited to a particular format. For example, NTSC (National Television System Committee)
Various selections such as signals can be made. Note that, in the embodiment of the present invention, hereinafter, the analog image transmission processing device S _TX
Will be described as an NTSC signal. The sub-band encoding unit 1 as sub-band encoding means performs publicly-known and well-known sub-band encoding on an input image signal. A so-called filter bank known and well-known in encoding is QMF (Quadrature
Mirror Filter (orthogonal mirror image filter).

More specifically, the sub-band encoder 1 includes a low-frequency orthogonal mirror filter for horizontal band division (denoted as “LPF QMF (1)” in FIG. 1) 11 and a high-frequency band for horizontal band division. Area orthogonal mirror image filter ("HPF QMF (2)" in Fig. 1)
12) and horizontal first down sampler 13
, A horizontal second down sampler 14, and a first vertical band dividing low-pass orthogonal mirror image filter (in FIG. 1, "LP
F QMF (3) ”), a first high-frequency orthogonal mirror filter for vertical band division (referred to as“ LPF QMF (4) ”in FIG. 1) 16, and a second low-frequency orthogonal band filter for vertical band division. Area orthogonal mirror image filter (denoted as "LPF QMF (5)" in FIG. 1) 17 and a second high band orthogonal mirror image filter for vertical band division (denoted as "LPF QMF (6)" in FIG. 1) 18 Vertical first down sampler 19 and vertical second down sampler 2
0, a third down sampler 21 for vertical use, and a fourth down sampler 22 for vertical use. Although the finally transmitted image signal is an analog signal, the sub-band encoder 1 may process the analog image signal as it is, The signal may be converted into a signal, processed with a digital signal, and converted to an analog signal at the stage of output from the sub-band encoder 1, and output.

In the sub-band encoder 1, an input image signal is, for example, an NTSC signal having 480 effective scanning lines and 736 effective pixels in the horizontal direction for an image of one frame as shown in FIG. First, band division is performed on a signal in the horizontal direction of the image in a low band and a high band. A low band orthogonal mirror image filter 11 for horizontal band division and a band The high-frequency orthogonal mirror image filter 12 is provided for that purpose. That is, the image signal as described above is input to the horizontal band dividing low band orthogonal mirror image filter 11 and the horizontal band dividing high band orthogonal mirror image filter 12, and the original image signal is output from the horizontal band dividing low band orthogonal mirror image filter 11. The signal having only the low-frequency component from which the horizontal high-frequency component of the image has been removed is output from the high-frequency orthogonal mirror image filter 12 for horizontal band division to the high-frequency component of the original image from which the horizontal low-frequency component has been removed. A signal with only components
Each is output. Here, the characteristics of the low-frequency orthogonal mirror image filter 11 for horizontal band division and the high-frequency orthogonal mirror image filter 12 for horizontal band division are generally known and well-known as characteristics of QMF, and are not specific to the present invention. Since it is not provided, a detailed description thereof will be omitted.

The first horizontal down sampler 13 and the second horizontal down sampler 14 perform so-called signal sampling (sampling), and the first horizontal down sampler 13 has a horizontal band. With respect to the horizontal direction of the output signal of the splitting low-pass orthogonal mirror image filter 11, the horizontal second down sampler 14 is provided with respect to the horizontal direction of the output signal of the horizontal band splitting high-pass orthogonal mirror image filter 12. Down sampling is performed. Then, these first and second horizontal down samplers 1
3 and 14, the low band orthogonal mirror image filter 11 for horizontal band division and the high band orthogonal mirror image filter 12 for horizontal band division
Are image signals having half the number of pixels in the original image in the horizontal direction. That is, specifically, in the embodiment of the present invention, the image signal of 736 (the number of effective pixels in the horizontal direction) × 480 (the number of effective scanning lines in the vertical direction) described above is used for the signal component in the horizontal direction. By down-sampling, an image signal of 368 (the number of effective pixels in the horizontal direction) × 480 (the number of effective scanning lines in the vertical direction) is obtained, which is a half of the number of pixels (see the image denoted by reference numerals B and C in FIG. 1).

The first vertical band splitting low-pass orthogonal mirror image filter 15 and the second vertical band splitting high-frequency orthogonal mirror image filter 16 transmit a signal from the horizontal first down sampler 13 to the second vertical vertical sampler 13. The low band orthogonal mirror image filter 17 for band division and the second high band orthogonal mirror image filter 18 for vertical band division
The signals from the second horizontal down sampler 14 are input. These first vertical band dividing low-pass orthogonal mirror image filter 15 and second
High-frequency orthogonal mirror image filter 16 for vertical band division and second
The input of image signals to the low band orthogonal mirror image filter 17 for vertical band division and the second high band orthogonal mirror image filter 18 for vertical band division is sequentially input in the vertical direction (see FIG. 1). In the image indicated by the symbols b and c,
Each part is indicated by a solid arrow).

Here, the characteristics of the first vertical band dividing low band orthogonal mirror filter 15 and the second vertical band dividing low band orthogonal mirror image filter 17 are the same as those of the horizontal band dividing low band orthogonal mirror image filter 11 described above. The characteristics are basically the same as those of the second high band orthogonal mirror image filter 16 for vertical band division and the second
The characteristics of the high-frequency orthogonal mirror image filter 18 for vertical band division of
The characteristics are basically the same as those of the above-mentioned high-frequency orthogonal mirror image filter 12 for horizontal band division.

The output signal of the first vertical band dividing low band orthogonal mirror image filter 15 is output from the second vertical band dividing high band orthogonal mirror image filter 16 by the first vertical down sampler 19. Are down-sampled in the vertical direction by the second down sampler 20 for vertical. The output signal of the second vertical band dividing low band orthogonal mirror image filter 17 is output from the second vertical band dividing high band orthogonal mirror image filter 18 by the third vertical down sampler 21. The fourth down sampler 22 performs down sampling in the vertical direction.
Here, the first to fourth down samplers 19 to 19 for vertical use
Reference numeral 22 basically has the same configuration, and further, basically, the first and second horizontal components.
Has the same configuration and function as the down samplers 13 and 14.

First to fourth vertical down samplers 1
As a result of the down-sampling by 9 to 22, the vertical scanning line number of each of the image signals obtained from the first to fourth down-samplers 19 to 22 becomes half of that before down-sampling. That is, 368
An image signal of (the number of effective pixels in the horizontal direction) × 240 (the number of effective scanning lines in the vertical direction) is obtained (see reference numerals d, e, f, and g in FIG. 1). From the vertical first down sampler 19, the low-frequency component of the even field (EVEN) and the odd field
An image signal corresponding to the synthesis of the low-frequency component of (ODD), in other words, an image signal having only the low-frequency component in both the horizontal and vertical directions is obtained. From the second vertical down sampler 20, an image signal corresponding to the difference between the low-frequency component of the even field and the low-frequency component of the odd field, in other words,
An image signal having only low-frequency components in the horizontal direction and only high-frequency components in the vertical direction is obtained. From the third down sampler 21 for the vertical, an image signal corresponding to the synthesis of the high frequency component of the even field and the high frequency component of the odd field, in other words, only the high frequency component in the horizontal direction and low As a result, an image signal having only the band component is obtained. From the fourth down sampler 22 for the vertical, an image signal corresponding to the difference between the high frequency component of the even field and the high frequency component of the odd field, in other words, the image signal of only the high frequency component in both the horizontal and vertical directions Is obtained.

A transmitting color signal processing section 4 as a transmitting color signal processing means extracts a signal for a color component of an image signal and inputs the output signal to a data processing section 2 described below. I have. That is, the transmission-side color signal processing unit 4
Is to add the signal of the color component for the even field and the signal of the color component for the odd field of the input NTSC signal, and to halve the result,
The signal is a composite signal of the color components of the even field and the odd field, and has a size of 368 (the number of effective pixels in the horizontal direction) × 240 (the number of effective scanning lines in the vertical direction). As described above, the band division is not performed on the color signal because the information amount of the color signal is about half that of the luminance signal. Is not necessary.

Next, the respective image signals obtained in the sub-band encoding unit 1 and the transmission-side color signal processing unit 4 as described above are input to the data processing unit 2 as data processing means. The VIS code described above is added. That is, first, in the analog image transmission processing device _STX , the divided image signal obtained by the sub-band encoding unit 1 and obtained by band-dividing one original image as described above is As shown in FIG. 3, a VIS code is added to the head, and then each of the divided analog image signals to which a header is added is sequentially transmitted. The data processing unit 2 generates and adds the VIS code, It has a function of generating and adding a header for each divided image.

The VIS (Vertical Interval Signaling) code is a publicly-known or well-known code used in analog image transmission, and the receiving side can determine what kind of image is transmitted together with this code at the start of reception. In this way, the receiving side is used to match the receiving mode. Although the detailed data structure is omitted, roughly speaking, 7 bits representing image information are 1 bit.
The parity bits are added.
Next, the header is a so-called marker code added for positioning at the head position of each of the divided analog images. Specifically, as shown in FIG.
It is composed of 4-bit “0” and 1-bit “1”. In particular, it is preferable that the data of each bit is encoded by, for example, a 31-bit PN sequence code to spread the data. A technique for encoding data using such a PN sequence code has already been proposed by the applicant and is known (Japanese Patent Laid-Open No.
Therefore, a detailed description is omitted, but in general, a code generator for generating a 31-bit long M-sequence code is provided to obtain a PN-sequence code, and a multiplier is provided. By obtaining the result of multiplication of the code obtained by the code generator and the above-mentioned marker code by the multiplier, it is possible to realize the encoding of the marker code by the PN sequence code.

Then, 368 is added to the header as described above.
The divided analog image signal of (the number of effective pixels in the horizontal direction) × 240 (the number of effective scanning lines in the vertical direction) follows. The order of transmitting the divided analog image signal to which the header is added is as follows. First, the divided image corresponding to the combination of the low-frequency component of the even field and the low-frequency component of the odd field obtained from the vertical first down sampler 19 Second, the divided image signal corresponding to the combination of the color components of the even field and the color component of the odd field is the third low-pass signal of the even field obtained from the second down sampler 20 for vertical. Fourth, the divided image signal corresponding to the difference between the low frequency component of the odd field and the high frequency component of the even field obtained from the third vertical down sampler 21 is combined with the high frequency component of the odd field. Finally, a divided image signal corresponding to the difference between the high frequency component of the even field and the high frequency component of the odd field obtained from the fourth down sampler 22 for vertical is Image signal, and is sent respectively (see FIG. 3).

The modulation section 3 performs predetermined modulation on the VIS code, header, and image signal added as described above, and outputs the modulated signal. For example, the modulation scheme is subcarrier frequency modulation (SCFM). Is preferred. The signal modulated by the modulation unit 3 is transmitted to a transmission path (not shown) (wireless line or wired line).

Next, the analog image reception processing device S _RX will be described. This analog image reception processing device S _RX
Used to demodulate the analog image signal transmitted from the previous analog image transmission processing apparatus S _{T X} via the transmission path,
The demodulation unit 5, the data demodulation processing unit 6, the subband decoding unit 7, and the receiving-side color signal processing unit 8 are roughly divided and configured. The demodulation unit 5 performs a demodulation process on the received signal, which has been subjected to a predetermined modulation. As described above, the analog image transmission processing device S _{T X} Is a subcarrier frequency modulation (SCFM), this demodulation unit 5 performs subcarrier frequency demodulation.

The data demodulation processing unit 6 as the data demodulation processing means detects the VIS code described above from the demodulated signal, decodes the VIS code and determines what kind of image is transmitted. Is determined. If it is determined that the received signal is an image signal as described above with reference to FIG. 3, the header following the VIS code is read, and the divided analog image signals after the header are sequentially read. , To the sub-band decoding unit 7. Note that the divided analog image signal for the color component is input from the data demodulation processing unit 6 to a receiving-side color signal processing unit 8 described later.

When reading the header, as described above, if the header has been encoded by the PN sequence code on the transmission side, it is necessary to perform decoding for that. That is, a code generator that generates the same 31-bit M-sequence code as the transmitting side and a multiplier are provided, and a header before decoding and an output signal of the code generator are input to the multiplier, and both are multiplied. By performing this, decoding of the marker code of the header can be realized, and a marker code before encoding can be obtained.

The sub-band decoding section 7 as sub-band decoding means includes first to fourth up-samplers 25 to
28, and first to fourth orthogonal mirror image filters for vertical band synthesis (in FIG. 2, "QMF '(1)", "Q
MF '(2) ","QMF' (3) "and" QMF '(4) "29-32, and the first and second combiners 33 and 34.
And first and second orthogonal mirror image filters for horizontal band synthesis (“QMF ′ (5)”, “QM
F ′ (6) ”), and a third combiner 37. Note that, similarly to the above-described sub-band encoding unit 1, the sub-band decoding unit 7 may use either an analog signal or a digital signal for the signal format in the internal signal processing. Things.

First to fourth up-samplers 25-2
8 is to return the input image signal to the frequency of the original image signal before being processed in the previous subband encoding unit 1.
It performs so-called down-sampling in the horizontal and vertical directions, and both have the same basic configuration and operation. The first to fourth up-samplers 25 to 28 provide an image signal of 736 (the number of effective pixels in the horizontal direction) × 480 (the number of effective scanning lines in the vertical direction) (see FIG. 2).

The first to fourth quadrature mirror image filters 29 to 32 for vertical band synthesis are the first low band quadrature mirror image filter 15 for the first vertical band division in the subband encoder 1 and
A second vertical band dividing high band orthogonal mirror image filter 16, a second vertical band dividing low band orthogonal mirror image filter 17,
The characteristics are determined in correspondence with the vertical band dividing high band orthogonal mirror image filter 18 described above. Accordingly, the image signals are sequentially input in the vertical direction to the first to fourth orthogonal mirror image filters 29 to 32 for vertical band synthesis, and filtering for band synthesis in the vertical direction is performed. .

The first orthogonal mirror image filter 29 for vertical band synthesis and the second orthogonal mirror image filter 3 for vertical band synthesis
The output signal from 0 is combined in the first combiner 33 by adding both signals, and input to the first orthogonal mirror image filter 35 for horizontal band combination. On the other hand, the third orthogonal mirror image filter 3 for vertical band synthesis
1 and the output signal from the fourth quadrature mirror image filter 32 for vertical band synthesis are subjected to signal synthesis by addition of both signals in a second synthesizer 34, and the resultant signal is supplied to a second orthogonal mirror image filter 36 for horizontal band synthesis. Is to be entered. In the image synthesis by the first and second synthesizers 33 and 34, when determining the head position of each of the input images, the sub-band coding unit 1 adds the head position as described above. , Is determined based on the header identified by the data demodulation processing unit 6, so that a faithful image reproduction can be achieved without causing a positional shift in the composite image.

The first and second quadrature mirror image filters 35 and 36 for horizontal band synthesis are the low band quadrature mirror image filter 11 for horizontal band division and the high band quadrature mirror image filter for horizontal band division in the sub-band encoder 1 described above. 12, the characteristics are determined. Therefore, these first and second orthogonal mirror image filters 35 and 36 for horizontal band synthesis are
Image signals are sequentially input in the horizontal direction, and filtering for band synthesis in the horizontal direction is performed. Then, image signals from the first and second orthogonal mirror image filters 35 and 36 for horizontal band synthesis are output to a third synthesizer 37.
Is input to On the other hand, the receiving-side color signal processing unit 8 as the receiving-side color signal processing unit receives the divided analog image signal corresponding to the combination of the even-field color components and the odd-field color components from the data demodulation processing unit 6. However, since this signal has a size of 368 (the number of effective pixels in the horizontal direction) × 240 (the number of effective scanning lines in the vertical direction) as described above, 736 (the number of effective pixels in the horizontal direction) × 480 (the number of vertical pixels) (The number of effective scanning lines in each direction). The output signal of the receiving-side color signal processing unit 8 is
The data is input to the third synthesizer 37. And the first and second orthogonal mirror image filters 3 for horizontal band synthesis
The image signals from the color signals 5 and 36 and the color signal from the receiving-side color signal processing unit 8 are combined, and the original image (see reference numeral A in FIG. 2) is reproduced.

[0030] Here, it is assumed that the general description of the overall flow in the transmission of the image signal by the configured analog image transmission apparatus by an analog image transmission processing apparatus S _TX and analog image reception processing apparatus S _RX as described above .
First, it is assumed that the transmitted image signal is an NTSC image signal as described above with reference to FIG. 1 (see reference numeral a in FIG. 1). The transmitted image signal is output from the analog image transmission processing device S.
_The band is divided in the horizontal direction and the vertical direction by the subband encoding unit 1 using QMF by the _TX, and is input to the data processing unit 2. In the data processing unit 2,
A VIS code is added to the head of a set of image signals, and a predetermined data structure as a marker code for representing the head position is provided at the head position of each divided analog image signal. Header (see Fig. 4)
Are respectively added (see FIG. 3), and are sent to the modulation unit 3 in order from the VIS code. Then, in the modulation section 3, predetermined modulation is performed and transmitted to the transmission path.

On the other hand, in the analog image reception processing device S _RX , when a signal from the transmission path is received, first, demodulation is performed in the demodulation unit 5, and the demodulated signal is transmitted to the data demodulation processing unit 6. Is entered. The data demodulation processing unit 6 first detects a VIS code, and when a predetermined VIS code is detected, it is determined that the image signal having the configuration shown in FIG. The signal following the code is fetched. That is,
The header is read, and the subsequent divided image signal is input to the subband decoding unit 7. In the sub-band decoding unit 7, band synthesis is performed based on the divided image, image synthesis is performed based on the information of the previous header, and finally, the original analog image signal (FIG. 1 and FIG. 2). Is obtained. In this analog image transmission apparatus, the divided image signals as shown in FIG. 3 are sequentially transmitted and reproduced on the receiving side. If a divided image of only the low-frequency component of the odd field (see FIG. 3) and a divided image of only the color components of the even field and the odd field (see FIG. 3) are obtained, the outline of the image can be identified. It is easy to determine the necessity of the image during the reproduction of the image without waiting for the synthesis of the subsequent divided image.

[0032]

As described above, according to the present invention,
When sending individual images divided by sub-band coding, the receiving side can recognize the start position of each image, so when combining the divided analog images and reproducing the original image Positioning becomes easy, and accurate analog image reproduction can be performed. In addition, when performing sub-band encoding using an orthogonal mirror image filter on an analog image signal using so-called interlaced scanning, and sending individual band-divided image signals obtained thereby, first,
Send the divided image signal of the sum of the image signal of the low-frequency component of the even field and the image signal of the low-frequency component of the odd field, and then send the image signal of the sum of the respective color components of the even field and the odd field. On the receiving side,
Without receiving all the other divided image signals, the contents of the original image can be roughly reproduced by the preceding two types of image signals. The contents can be roughly judged, and an effect that a comfortable image reproduction can be realized without giving the user a feeling of stress on the image reproduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a configuration example of an analog image transmission processing device included in a subband encoded analog image transmission device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a configuration example of an analog image reception processing device included in a subband coded analog image transmission device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram schematically illustrating a configuration of a transmission signal in a subband encoded analog image transmission device according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a specific data configuration of a header included in the transmission signal shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Subband encoding part 2 ... Data processing part 3 ... Modulation part 4 ... Transmission side color signal processing part 5 ... Demodulation part 6 ... Data demodulation processing part 7 ... Subband decoding part 8 ... Receiving side color signal processing part

Continued on the front page F-term (reference) 5C059 MA41 PP04 PP14 RA01 RA04 RB09 RC24 SS01 UA02 UA05 UA15 5C063 AA02 AB07 AB09 AC01 CA11 CA12 CA31 CA36 CA40 DA07 DA13 5C078 AA09 BA02 BA53 CA00 CA14 DA01 DA02 DB04 5K029 AAGG BB03 HH21 LL01 9A001 BB01 BB02 BB04 CC05 HH27 HH28 HH31 KK31 LL02

Claims (9)

[Claims] 1. A sub-band coded analog that performs band division by sub-band coding on an analog image signal and transmits the analog image signal, and performs band synthesis by sub-band decoding to reproduce the image signal. An image transmission method, wherein a transmitting side adds a predetermined header to the head of each divided image signal obtained by the band division to indicate a head position of the divided image, and sequentially transmits the divided image signal, A subband coded analog image transmission method, comprising: determining a head position of each divided image based on the header to perform image synthesis. 2. The band division of an image signal by sub-band encoding is a band division into a low band and a high band by an orthogonal mirror image filter. A first divided image signal composed of a sum of an image signal having only low-frequency components in an odd field and an image signal having only low-frequency components in an odd field; A second divided image signal having a difference from an image signal having only components, an image signal having only high-frequency components in even fields, and a third image signal having a sum of image signals having only high-frequency components in odd fields. And a fourth divided image comprising a difference between the image signal having only the high-frequency component of the even field and the image signal having only the high-frequency component of the odd field Subband coding analog image transmission method according to claim 1, wherein the issue and, thereby obtaining a. 3. A method of extracting a color component signal from an analog image signal before subband coding, and extracting a first divided image signal, the color component signal, a second divided image signal, and a third divided image signal. 3. The method according to claim 2, wherein the transmission is performed in the order of the first and fourth divided image signals. 4. On the transmitting side, each bit constituting the header is encoded with a PN sequence code, while on the receiving side, the header is obtained by decoding with a PN sequence code. 4. The method for transmitting a subband encoded analog image according to claim 1, wherein 5. A transmission processing device for subjecting an analog image signal to band division by sub-band encoding and transmitting the analog image signal, and a reception process for performing band synthesis by sub-band decoding to reproduce an image signal. A sub-band coded analog image transmission device, comprising: a transmission processing device, at the head of each of the divided image signals obtained by the band division, representing a head position of the divided image. The sub-band encoded analog image is characterized in that, while adding the predetermined header and sequentially transmitting the sub-band, the reception processing device determines the head position of each divided image based on the header and performs image synthesis. Transmission equipment. 6. A transmission processing device, comprising: a sub-band encoding unit for performing band division by sub-band encoding on an analog image signal; and a signal having a predetermined size by extracting a color component signal from the analog image signal. A transmission-side color signal processing unit that converts the image data into a divided image signal obtained by the band division in the sub-band encoding unit and a divided image signal related to a color component obtained by the transmission-side color signal processing unit. ,
Data processing means for adding a predetermined header for indicating the head position of the divided image and sequentially transmitting the data, and the reception processing device includes a data demodulation processing means for detecting a header of the received divided image. A receiving-side color signal processing unit that converts a divided image signal relating to a color component input from the data demodulation processing unit into a predetermined size, performs band synthesis by sub-band decoding, and The sub-band coded analog image transmission apparatus according to claim 5, further comprising: a sub-band decoding unit that reproduces an image signal based on an output signal of the color signal processing unit. 7. The band division of the image signal by the sub-band encoding in the sub-band encoding means is a band division into a low band and a high band by an orthogonal mirror image filter. A first divided image signal composed of a sum of an image signal having only low-frequency components of even fields and an image signal having only low-frequency components of odd fields; and an image signal having only low-frequency components of even fields. A second divided image signal consisting of a difference from an image signal having only low-frequency components of odd fields, an image signal having only high-frequency components of even fields, and an image signal having only high-frequency components of odd fields. , A third divided image signal having only the high frequency component of the even field, and an image signal having only the high frequency component of the odd field. Subband coding analog image transmission apparatus according to claim 6, wherein the fourth divided image signal consisting of the difference, is intended to obtain a. 8. A data processing means for transmitting a first divided image signal, a divided image signal relating to a color component, a second divided image signal, a third divided image signal, and a fourth divided image signal in this order. The sub-band coded analog image transmission device according to claim 7, wherein: 9. The data processing means encodes each bit constituting the header with a PN sequence code, while the data demodulation processing means obtains the header by decoding with a PN sequence code. The sub-band coded analog image transmission device according to claim 5 or 8, wherein: