JPH08336145A - Image information transmission system - Google Patents

Abstract

PURPOSE: To decide the next transmission mode corresponding to the transmission mode of transmitted image information by dividing one image to plural blocks consisting of plural picture elements and transmitting by compressing the image with compressing methods different at every block. CONSTITUTION: Difference between reproduced picture element data when it is transmitted in a mode (e) and a mode (c) is calculated by using the output of an A/D converter 100 and that of an interpolation circuit 102, and the sum of the difference is calculated at every picture element block by a block distortion Dc arithmetic circuit 103. While, the difference between transmitted picture element data on a screen and stored in frame memory 104 and that on the present image is calculated by a block distortion Dp arithmetic circuit 105, and the sum (block distortion Dp) of the difference at every picture element block is found. A comparator 106 supplies a small value to a mode judging circuit 107 as composite block distortion Dm with data representing which Dc or Dp is larger, and allocates the data to prescribed number of modes (e) in sequence of higher Dm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image information transmission system, and more particularly to an image information transmission system for continuously transmitting a group of images having temporal correlation.

[0002]

2. Description of the Related Art When transmitting information such as image information, the theme has always been how to reduce the amount of information to be transmitted so that the original information can be faithfully reproduced. Has been proposed in the past.

Sampling density for the above theme,
That is, there is an adaptive variable density sampling method that appropriately changes the information density to be transmitted. A time-axis conversion band compression method (hereinafter referred to as TA
T: Time Axis Transform) will be briefly described by taking a one-dimensional case as an example.

FIG. 6 is an explanatory view of the basic concept of TAT. The original signal is divided into predetermined periods as shown by a dotted line, and whether the information contained in each divided block is coarse or dense is shown. Determine. For blocks judged to be dense, all the data obtained by sampling the original signal are transmitted as transmission data, and for blocks judged to be coarse, only a part of all the data is used as transmission data and the others are thinned out. It shall not be transmitted as data.

According to the above concept, the number of data transmitted per unit time is reduced, and the band compression of the transmission signal becomes possible. These transmitted data are also used at the receiving side to form data corresponding to the thinned data. That is, the thinned-out data becomes interpolation data obtained by performing an approximate calculation using the data transmitted at the time of reception. In addition, since this interpolated data corresponds to the coarse information, it becomes data that is very close to the thinned-out data, and the fidelity of the restored signal to the original signal is almost changed compared to when all the data is transmitted. Instead, the transmission band can be significantly compressed. That is, the amount of information to be transmitted can be reduced.

On the other hand, for each block, the determination as to whether to transmit all the sampling data or a part of the data is made by checking the density state of the original signal and transmitting the determination information as transmission mode information at the same time.

The case where the above concept is applied to the transmission of image information will be described. Image information has a two-dimensional spread and has correlation in both horizontal and vertical directions, so more effective transmission is possible if not only the horizontal sampling interval but also the vertical sampling interval is variable. Becomes This concept is hereinafter referred to as two-dimensional TAT, which will be briefly described below. The basic concept of this two-dimensional TAT has already been disclosed in Japanese Patent Application No. 60-148112 filed by the present applicant.

FIG. 7 is a diagram showing a data transmission pattern in the two-dimensional TAT. In the two-dimensional TAT, one screen is divided into pixel blocks of m × n pixels, and the density of transmission data is changed for each pixel block. In FIG. 7, it is assumed that the pixel block is composed of 4 × 4 pixels, and a data transmission pattern in the case of transmitting the block in two types of transmission modes is shown.

In the figure, the circles indicate transmission pixels, and the crosses indicate thinned pixels. Further, E shows a pattern for transmitting all pixel data as shown, and C shows a pattern for transmitting only a part of all pixel data. Hereinafter, the transmission modes based on these transmission patterns will be referred to as E mode and C mode, respectively. As is clear from the figure, the C mode is transmitted with an information density of 1/4 that of the E mode.

For the thinned pixels of the pixel block transmitted in the C mode, on the receiving side, the pixel data adjacent to the pixel data in the transmitted pixel data is used to form and restore the interpolated pixel data.

The structure for realizing such two-dimensional TAT transmission will be described below. FIG. 8 shows a two-dimensional T
It is a figure which shows the schematic structural example of the transmission side of the transmission system by AT. In the example shown in FIG. 8, an analog transmission system will be described as an example.

The input analog image signal is sampled for all pixels by an analog / digital (A / D) converter 1 to generate digital all pixel data.
When all the pixel data is supplied to the thinning circuit 2, FIG.
Thinning processing corresponding to the C mode pattern of
Outputs mode pixel data. This C-mode pixel data is supplied to the interpolation circuit 3, and the interpolation pixel data corresponding to the thinned pixel data is calculated.

This interpolated pixel data is supplied to the mode discriminating circuit 4 together with all the pixel data output from the A / D converter 1, and whether each pixel block is transmitted in the C mode or E
It is determined whether to transmit in the mode. The mode discriminating circuit 4 calculates the difference between the pixel data output from the A / D converter 1 and the interpolated pixel data, and calculates the sum of these differences (hereinafter referred to as block distortion) for each pixel block. One field is stored in the memory.

The distribution of block distortions of all pixel blocks is calculated until the data of the next field is input. Here, in order to keep the compression rate constant, the ratio between the number of pixel blocks transmitted in the C mode and the number of pixel blocks transmitted in the E mode must always be constant. For example, if the pixel blocks transmitted in the C mode are set to ⅔ of the whole and the pixel blocks transmitted in the E mode are set to ⅓ of the whole, the number of data (compression rate) transmitted as a whole is (2/3 × 1). /
4 + ／ × 1 =) １ ／. Therefore, a distortion threshold value is determined in advance based on the block distortion distribution of all pixel blocks in order to determine how much block distortion should be used as the boundary for C mode and E mode allocation.

Then, the block distortion accumulated at the timing when the image signal of the next field is input is sequentially read out and compared with the distortion threshold value to determine the transmission mode. If the read block distortion matches the distortion threshold, the pixel blocks transmitted in the C mode at a predetermined ratio as described above, and E
The transmission mode is assigned so that the ratio with the pixel block transmitted in the mode matches, and the mode determination circuit 4 outputs the mode assignment as a mode determination signal.

The mode discrimination signal obtained as described above is supplied to the switch 7, and the buffer 5 for E mode pixel data is supplied.
Then, the pixel data is read out alternatively from the buffer 6 for the C mode pixel data. The output data of the switch 7 is input as transmission data to a digital / analog (D / A) converter 8, where it is converted to an analog pixel signal and output to a transmission path. The mode discrimination signal is also output to the transmission line as a mode information signal via the buffer 9.

FIG. 9 is a diagram showing a schematic configuration example of the receiving side of a transmission system using a two-dimensional TAT. The pixel signal that has been subjected to the above-described processing and is input through the transmission path is converted into digital pixel data by the A / D converter 10. The output of the A / D converter 10 is supplied to the C mode interpolation circuit 11, and C
Interpolation data is calculated from the thinned pixel data transmitted in the mode.

On the other hand, the transmitted mode information is the switch 1
2 when the mode information indicates the E mode.
Side, and when showing the C mode, connect to the C side in the figure. As a result, all pixel data including the E mode pixel data, the C mode pixel data, and the interpolation pixel data are stored in the frame memory 13. For example, all pixel data is read from the frame memory 13 in an order conforming to a television signal, and is output as an image signal via the D / A converter 14.

As described above, in the two-dimensional TAT transmission system, image information can be transmitted extremely effectively.

[0020]

By the way, when a television signal as described above is displayed, it does not matter if the resolution is low in the moving image area in the playback screen, but the resolution does not deteriorate in the still image area. It is easily noticeable.

Therefore, the still image area on the screen has a high correlation in the time axis direction, and a television signal processing method using this correlation in the time axis direction is advancing in recent years. .

However, in the above-mentioned two-dimensional TAT transmission system, even when a group of screens having temporal correlation is continuously transmitted, a still image area and a moving image area on the screen are particularly distinguished. Without doing so, the transmission is also performed for a still image area having a high correlation in the time axis direction.

Therefore, similar image information is repeatedly transmitted many times in a still image area having a very high correlation on the time axis, resulting in very poor transmission efficiency.

The present invention has been made in view of the above-mentioned problems, and when the screen groups having temporal correlation are continuously transmitted, the following information is transmitted according to the transmission mode of the image information already transmitted. An object of the present invention is to provide an image information transmission system capable of determining a transmission mode of image information and capable of performing transmission with high transmission efficiency.

[0025]

[Means for Solving the Problems] Under such a purpose,
The present invention is an image information transmission system for continuously transmitting a plurality of images having a correlation with each other, in which one image is divided into a plurality of blocks composed of a plurality of pixels, and a compression method different for each block is used. While compressing and transmitting the compressed image, the compression method of each block in the predetermined image is determined using the difference between the predetermined image and the corresponding block of the other image and the information about the compression method for the other image. It is the one.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.

In this embodiment, the number of transmitted data is reduced by utilizing the temporal correlation of image information in the above-mentioned two-dimensional TAT transmission system, which should also be called three-dimensional TAT. is there. That is, the three-dimensional T of this embodiment
In the AT transmission system, paying attention to the fact that it is not necessary to update the pixel data on the receiving side in the static area of the screen, and when transmitting the same amount of data as the two-dimensional TAT transmission system, It is intended to further improve the image quality.

The basic concept of this embodiment will be described below. Once all pixel data has been transmitted once for the pixel block in the still area, the pixel data of the screen will not be transmitted for this pixel block when transmitting the subsequent screen, and the previously transmitted data will be transmitted. It is intended to be used repeatedly. The transmission mode in which the pixel data of the screen transmitted in this way is not transmitted is hereinafter referred to as the p mode, and the transmission mode corresponding to the E mode and the C mode in the two-dimensional TAT is distinguished from the case of the two-dimensional TAT. Are referred to as e-mode and c-mode, respectively.

When it is considered that the same amount of data is transmitted as in the case of two-dimensional TAT, the number of pixel blocks in the p mode increases, and the remaining pixel blocks can be transmitted in the e mode. Therefore, as the stationary area increases, the number of pixel blocks capable of obtaining high resolution on the receiving side can be increased, and the reproduced image quality is further improved.

FIG. 1 is a diagram showing a schematic configuration of a transmission side of a transmission system as an embodiment of the present invention. In this example, an analog transmission system is targeted. Here, the data of the previous screen is shown by a thick line, and the data of the current screen is shown by a thin line.

The input analog image signal is an analog image signal.
The digital (A / D) converter 100 converts it into a digital signal and outputs all pixel data. This all-pixel data is supplied to the thinning circuit 101 as in the case of the two-dimensional TAT, and thinning corresponding to the c-mode pattern is performed.
Obtain c-mode pixel data (basic pixel data). The c-mode pixel data is supplied to the interpolation circuit 102, and the interpolation pixel data corresponding to the thinned pixel data is calculated.

Here, the process of determining which of the three modes, e, c, p, the pixel block is to be used for transmitting will be described. The process is roughly divided into two stages. First, as the first step, the difference in the reproduced pixel data between the case of transmitting in the e mode and the case of transmitting in the c mode as in the case of the two-dimensional TAT is the A / D converter 10
Calculation is performed by using the output of 0 and the output of the interpolation circuit 102, and the sum of these differences (hereinafter referred to as block distortion Dc) is calculated by the block distortion Dc calculation circuit 103 for each pixel block.

On the other hand, the difference between each pixel data in the already stored screen stored in the frame memory 104 and each pixel data in the current screen is calculated, and similarly the sum of the differences (hereinafter The block distortion Dp) is calculated by the block distortion Dp calculation circuit 105. Comparator 106
Compares these Dc and Dp.

That is, the comparator 106 detects, for each pixel block, whether the screen can be faithfully reproduced in the case of transmission in the c mode or the transmission in the p mode. You are doing it. Therefore, in the case of Dc> Dp, the c mode is not established, and Dc <Dp
In the case of, the p mode is not set.

The comparator 106 supplies the data (Dc / Dp) indicating which of Dc and Dp is larger, and supplies the mode judging circuit 107 with the smaller value as the composite block distortion (Dm).

Next, as a second step, the mode determination circuit 107
In this case, a predetermined number of e-modes are assigned to each pixel block in descending order of Dm. The procedure of this allocation is to obtain the threshold value of Dm based on the distribution of Dm of all pixel blocks as in the case of the above-mentioned two-dimensional TAT. If Dm exceeds this threshold value, e mode, and Dm is smaller than the threshold value. In this case, a mode other than the e mode is set. When Dm is smaller than the threshold value, naturally when Dp> Dc, c mode, D
When p <Dc, the p mode is assigned. In accordance with this, the mode determination circuit 107 outputs data indicating whether the mode is the e mode or not (e / e ': e' means a mode other than the e mode) and Dp / Dc.

Here, it will be shown how the mode changes depending on the image to be transmitted, and further, how to use the already transmitted mode information to determine the mode information to be transmitted. Indicates whether or not.

The image in which the most remarkable effect of the three-dimensional TAT processing appears is the case where the entire screen is a still region over several frames, that is, a still image. Here, taking a still image as an example, FIG. 10 shows a mode change pattern per screen from the first frame at the system start-up to the completion of high-definition transmission over the entire area.

In FIG. 10, the number in parentheses under the mode represents the ratio of the ratio of the blocks transmitted in that mode in one screen.

In the first frame, since no information has been transmitted before that, the p-mode is not allocated, and the c-mode is 2/3, e as in the two-dimensional TAT processing.
Modes are assigned at a rate of 1/3.

Next, in the second frame, all the blocks assigned to the e-mode in the first frame change to the p-mode because the first frame is the whole area still image (t1 in the figure). Then, the e-mode of the second frame can be assigned to the area that was not in the e-mode of the first frame.

That is, among the blocks transmitted in the c mode in the first frame, 1/3 of the total number of blocks is transmitted in the e mode in the descending order of Dc in the second frame period (t2 in the figure).

Then, the remaining c mode becomes the c mode as it is (t3 in the figure).

In the third frame, the block (1/3 of the total number of blocks) assigned to the c mode in the second frame also changes to the e mode (t6 in the figure). That is, the p-mode is transmitted as it is as the p-mode (t4 in the figure), and the e-mode changes to the p-mode as described above (t5 in the figure), and eventually the p-mode alone occupies 2/3 of the total number of blocks. So
The remaining 1/3 can be changed from c mode to e mode.

By the above procedure, all the blocks in the fourth frame can be reproduced in the high definition mode (e mode or p mode).

If the still image state is maintained after the fourth frame, the p mode and the e mode are transmitted as they are (t7 and t8 in the figure).

In this way, the transmission mode that the current screen can take is determined according to the type of transmission that was performed on the previous screen, so that transmission with high transmission efficiency becomes possible.

FIG. 11 exemplifies an operation flowchart of the mode determination circuit 107 for determining mode allocation by utilizing the transmission mode of the previous screen.

In FIG. 11, the mode information of the previous screen is utilized to determine the mode information of the current screen in the process of the first step in the figure, and the second step is almost a two-dimensional TA.
Processing similar to T is performed. However, here, Dm is used instead of Dc in the assignment of the e-mode.

In other words, the mode determination circuit 107, after the processing of the second frame in FIG. 10, is in the e mode or p until then.
For blocks transmitted in the mode, the block distortions Dp and Dc are compared in the first step of FIG. 11, and the c mode is assigned the p mode according to the result, and the c mode is assigned in the first frame. If so, the c-mode is assigned, and in the second step of FIG. 11, the e-mode assignment is determined by the composite block distortion Dm.

The mode allocating operation shown in the flow chart of FIG. 11 is performed using the mode memory 115 shown in FIG. In other words, the mode memory 115 stores the mode information for one frame in association with each block, and writes the mode information of the frames whose modes have been assigned in order from the first frame. When determining the mode, first, the mode information of the previous screen is stored in the mode memory 11
5, the mode information is discriminated, and when the mode is the e mode or the p mode, the p mode and the c mode of the current screen are assigned according to the comparison result of the block distortions Dc and Dp input from the comparator 106. Then, the e-mode allocation is determined by the magnitude of the composite block distortion Dm value input from the comparator 107.

The mode information of the current screen determined as described above is input to the mode memory 115, and the contents of the mode memory 115 are rewritten.

In the transmission system of this embodiment, only mode information e / e 'is transmitted. At this time, whether the transmission mode of the pixel block which is not the e mode is the c mode or the p mode is transmitted as pixel data as follows.

That is, with respect to the pixel block transmitted in the p mode, the basic pixel data of the previous screen reproduced on the receiving side is transmitted. Further, all the pixels of the previous screen reproduced on the receiving side are stored in the frame memory 104,
The thinning circuit 108 performs the thinning processing in the same manner as the thinning circuit 101 to obtain the basic pixel data of the previous screen. The output data of the thinning circuit 108 thus obtained will be referred to as p-mode pixel data hereinafter. On the receiving side, if the basic pixel data of the pixel block is the same in successive screens as described later, it is determined that the pixel block of the subsequent screen is transmitted in the p mode.

Since the data stored in the frame memory 104 is all pixel data of the previous screen reproduced on the receiving side, the pixel data of the pixel block whose previous screen is the p mode is the data of the memory 104. Rewriting must be prohibited. Further, even if a pixel block whose previous screen is in the c mode is set in the p mode, the image quality improving effect cannot be obtained. Therefore, the data in the frame memory 104 may be rewritten only when the mode determination circuit 107 determines that the mode is the e mode. Therefore, in this embodiment, the rewriting of the memory 104 is controlled by e / e 'obtained from the mode determination circuit 107.

The buffers 109, 110, 1 for storing the pixel data generated based on each mode as described above.
P-mode pixel data, e-mode pixel data, and c-mode pixel data are obtained from the switch 11,
In accordance with e ′ and Dc / Dp, these are supplied to the digital-analog (D / A) converter 114 as an alternative.

Therefore, the D / A converter 114 outputs a three-dimensional T
An analog pixel signal will be transmitted by the AT transmission system. Also, e / e 'is transmitted as mode information via the buffer 112.

The distribution ratio of each mode in the above embodiment will be described below. FIG. 2 shows the block distortions Dp and D
FIG. 3 is a diagram showing mode allocation for c, and FIG. 3 is a diagram showing changes in allocation ratio depending on the image state.

In FIG. 2, Dc and Dp of the pixel block become larger as the block has a larger motion. Further, the value of Dc becomes larger in a portion with higher definition, that is, in a block having a two-dimensionally higher frequency. Dm is Dc and D
Since the smaller value of p is taken, Dm of the pixel block having Dc and Dp located at Xc is the value on the Dc axis when the perpendicular line is drawn on the Dc axis, as shown in the figure. On the other hand, Xp
Dm of the pixel block having Dc and Dp located at
A perpendicular line is drawn on the axis, and the value on the Dc axis is obtained when the perpendicular line is drawn on the Dc axis from the intersection of this perpendicular line and the straight line Dc = Dp.

Now, the Dm axis is provided in FIG.
, The threshold T2 is located at the Dc and Dp coordinates as shown in the figure, and determines the e-mode area. That is, in general, a pixel block having a high motion and a high definition is transmitted in the e mode.

FIG. 3 shows the allocation ratio of each mode as 1
It shows the case where the data compression rate of one entire screen is fixed to 1/2. Here, it is assumed that the pixel data transmitted in the p mode is 1/4 of the whole and is equal to that of the c mode, so the number of pixel blocks that can be transmitted in the e mode is always 1/3 of the whole.

In FIG. 3, a portion D in the figure is a two-dimensional TA.
This indicates the allocation ratio of T. That is, in the three-dimensional TAT transmission system, if there is no correlation between the front and rear screens, the same processing as the two-dimensional TAT is performed. On the other hand, when transmitting a completely still screen, the number of pixel blocks transmitted in c mode decreases, and the reproduced screen has the same resolution as when all pixel blocks are transmitted in e mode. The mode allocation ratio for a certain screen is indicated by the length of the line segment of the portion intersecting with the e, c, and p regions on the dotted line indicated by A in the figure. This dotted line A
As will be apparent from the above description, the position of is dependent on the temporal correlation of the transmitted image information.

FIG. 4 is a diagram showing a schematic configuration of the receiving side of the transmission system as an embodiment of the present invention. The analog pixel signal transmitted from the transmitting side shown in FIG.
At 00, it is converted to digital pixel data. The switch 205 is controlled by the transmitted mode information, and when each pixel block is transmitted in the e mode, outputs all pixel data as it is. When the data is transmitted in any other mode, the interpolation pixel data interpolated by the interpolation circuit 204 is output from e'in the figure. In this way, all pixel data based on the pixel data transmitted from the switch 205 is output to the all pixel frame memory 206.

On the other hand, the switch 209 outputs only the basic pixel data of the pixel block transmitted in the e mode through the thinning circuit 208, and outputs the basic pixel data as it is for the pixel block transmitted in the other modes. Output. The switch 209 is also controlled by the transmitted mode information. Therefore, the basic pixel data is output from the switch 209 and supplied to the basic pixel frame memory 201.

Further, the difference between the basic pixel data output from the switch 209 and the basic pixel data of the previous screen obtained from the frame memory 201 is calculated, and the sum of these differences (hereinafter referred to as block distortion Db) is calculated for each pixel block. This is calculated by the block distortion Db calculation circuit 202.

This block distortion Db is supplied to the comparator 203. If this Db is smaller than the threshold value TH, it is determined that the pixel block has been transmitted in the p mode.

As a result, information indicating whether the pixel data output from the switches 205 and 209 has been transmitted in the p mode or another mode (p / p ': p' means a mode other than the p mode). Is the frame memory 2
01, 206.

Thus, the frame memories 201 and 206
Will be prohibited for the pixel block transmitted in the p mode, and the data of the previous screen will remain as it is. If the data that has not been rewritten is e-mode pixel data, a good reproduction screen can be obtained.

In this manner, the frame memory for all pixels 20
The pixel data stored in 6 is updated, and the D / A converter 207 is read, so that an analog image signal is output from the D / A converter 207.

As described above, it will be apparent that in the transmission system of the above-described embodiment, a high resolution analog image signal can be obtained in the still region.

In the transmission system of the above-described embodiment, the mode information indicating the p mode is not transmitted, but it may be transmitted and the pixel data of the previous screen is not transmitted. Is. In this case, FIG. 5 shows changes in the allocation ratio of each mode when the compression ratio is fixed at 1/2.

As is clear from the figure, even in this case, if there is no correlation between the front and rear screens, the two-dimensional T as shown in the lower part of the figure is obtained.
The same processing as that of the AT is performed. Further, in this case, if the correlation in the time axis direction is high, the number of pixel blocks transmitted in the e mode increases.

[0073]

As described above, according to the present invention, the next image information is transmitted according to the transmission mode of the image information already transmitted when the screen groups having temporal correlation are continuously transmitted. It is possible to provide an image information transmission system that can determine the transmission mode of the transmission and can perform transmission with high transmission efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a transmission side of a transmission system as an embodiment of the present invention.

FIG. 2 is a diagram showing mode assignment for block distortions Dp and Dc.

FIG. 3 is a diagram showing a change in an allocation ratio depending on an image state.

FIG. 4 is a diagram showing a schematic configuration of a receiving side of a transmission system as an embodiment of the present invention.

FIG. 5 is a diagram showing a change in an allocation ratio of each mode when transmitting mode information of a p-mode as another embodiment of the present invention.

FIG. 6 is an explanatory diagram of a basic concept of TAT.

FIG. 7 is a diagram showing a data transmission pattern in a two-dimensional TAT.

FIG. 8 is a diagram illustrating a schematic configuration of a transmission side of a transmission system using two-dimensional TAT.

FIG. 9 is a diagram showing a schematic configuration on a receiving side of a transmission system using two-dimensional TAT.

FIG. 10 is a diagram showing a mode transition when the entire screen is a still area.

FIG. 11 is a flowchart showing the operation of a mode discriminating circuit for deciding mode assignment using the transmission mode of the previous screen as one embodiment of the present invention.

[Explanation of symbols]

 103 Block Distortion Dc Operation Circuit 104 Frame Memory 105 Block Distortion Dp Operation Circuit 106 Comparator 107 Mode Judgment Circuit 206 Mode Memory

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomohiko Sasaya, 770 Shimonoge, Takatsu-ku, Kawasaki-shi, Kanagawa Canon Inc., Tamagawa Plant (72) Hiroji Takahashi, 770, Shimonoge, Takatsu-ku, Kawasaki, Kanagawa Canon Inc. Company Tamagawa Plant (72) Inventor Susumu Katsuki 770 Shimonoge, Takatsu-ku, Kawasaki, Kanagawa Canon Inc.Tamagawa Plant (72) Inventor, Katsuji Yoshimura 770 Shimonoge, Takatsu-ku, Kawasaki, Kanagawa Canon Inc., Tamagawa In the office

Claims (1)

[Claims] 1. An image information transmission system for continuously transmitting a plurality of mutually correlated images, wherein one image is divided into a plurality of blocks each having a plurality of pixels, and a compression method different for each block. And compresses and transmits it, and determines the compression method of each block in the predetermined image using the difference between the predetermined image and the corresponding block of the other image and the information about the compression method for the other image. An image information transmission system characterized by the above.