JPH03153161A - Picture transmitter - Google Patents

Abstract

PURPOSE:To send and receive a picture of consecutive pages at a fast speed by providing plural storage means corresponding to each color component and a control means selecting input and output to/from the storage means in the unit of pages depending whether a sent picture is a black/white picture or a color picture. CONSTITUTION:In the case of memory transmission of a black/white picture, the read of a black/white data and write to a memory section 5 are similar in the case of the mode 12, the readout from a memory section 5 is applied in the order of a K memory 10, a Y memory 9, an M memory 8 and a C memory 7 in matching with the transmission speed for each page, a coding/decoding section 2 encodes the black/white picture data and outputs it through a transmission line control section to the transmission line. In the case of the memory reception of the color picture data, the control section 6 controls a data bus so that the coding/decoding section 2, the memory section 5 and the picture forming section 4 are to be connected. A transmission line control section 1 receives the transmission data from the transmission line and writes the color picture data (Ci, Mi, Yi, Ki: i is a line number) decoded by the coding/decoding section 2 via the control section 6 into color memories 7, 8, 9, 10 in the memory section 5. On the other hand, the picture forming section 4 reads the color picture of the memories 7, 8, 9, 10 via the control section 6 to form and output the color picture.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image transmission device, and particularly to an image transmission device that transmits black-and-white images and color images.

[Prior Art] A typical example of conventional image transmission is a facsimile machine, which is generally intended to transmit black and white images. On the other hand, with the spread of color copying machines, color photographs, color printers, etc., the existence of color images has become important, and in particular, there is a growing need to quickly transmit color images to long distances. Therefore, it is anticipated that color facsimile machines will emerge as an advanced version of black and white facsimile machines, and standardization of color facsimile machines is currently being considered.

Under these circumstances, the recording method of the color printer section, which is the image forming section of the color facsimile machine, is as follows.
Various methods are possible, such as electrophotography, thermal transfer, and inkjet, but there are few inexpensive and high-speed color printers, especially those that can print black and white images several times (3 to 4 times) faster than color images. Those that can form are rare.

However, the amount of information in a black and white image is about a fraction (1/4 to 1/3) of that in a color image, so it is faster to send one image over a transmission path.

[Problems to be Solved by the Invention] However, in an image transmission device having a color printer section whose image forming time is longer than the transmission time of the transmission path, it is necessary to adjust the actual speed of data transmission to the image forming speed or to adjust the waiting time during data transmission. There is a problem in that the capacity of the transmission line cannot be used to its maximum because it increases the time required. In particular, in an image transmission device that has a color printer section where the speed at which a color image is formed and the speed at which a black and white image is formed are almost the same, the transmission speed may be further slowed down or the waiting time may be increased when transmitting a black and white image. As a result, the usage of the transmission line is far below its capacity, which has the disadvantage of greatly increasing wasted transmission time and wasted transmission costs.

The present invention provides an image transmission device that eliminates the above-mentioned conventional drawbacks and makes use of the transmission capability of the data transmission path to shorten the usage time of the transmission path when transmitting image data. In particular, the present invention provides an image transmission device that can transmit and receive images of continuous pages at high speed when transmitting black and white image data.

[Means for Solving the Problem] In order to solve this problem, the image transmission device of the present invention has the following features:
An image transmission device for transmitting a monochrome image or a color image, comprising a plurality of storage means corresponding to each color component, and input/output to the storage means corresponding to whether the image to be transmitted is a monochrome image or a color image. and control means for switching in units.

[Function] In this configuration, the transmitted image data can be stored at high speed by switching the input/output to the storage means page by page depending on whether the image to be transmitted is a monochrome image or a color image. The information can be written to the data transmission means, the transmission capacity of the data transmission path can be utilized, and the usage time of the data transmission path can be shortened. In particular, in the transmission of black and white image data, when pages are transmitted successively, the storage means for writing can be switched, so images of successive pages can be received at high speed.

[Example] An image transmission device according to an example will be described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the general configuration of the image transmission device of this embodiment. In this figure, 1 is a transmission path control unit that controls connection with the transmission path and transmission exchange, and 2 is a transmission path control unit that controls data transmission. An encoding/decoding unit that encodes data at times and decodes data when receiving; 3 an image reading unit that reads a color image or a monochrome image as an electrical signal; 4 an image forming unit that outputs image data as a visible image; 5 is a memory section for storing image data, and 7゜8.9.10 is for each color (
This is a memory for recording image data (C: black, M: magenta, Y: yellow, black).

<Normal Processing> An example of the scanning method for image formation in the color printer unit connected to the image transmission device of this embodiment is shown in FIG.
2A and 12B show the normal image reception/output timing at this time for a color image and a monochrome image. In FIG. 2, 11 is a recording head section, 12 to 1
5 is a recording head (assuming an inkjet type) for each color (C: black, M: magenta, Y: yellow and black), and 16 is a recording paper. The recording head section 11 moves in the direction of the arrow (B), and the recording paper 16 forms an image in the area (A). Note that the recording paper 16 is in a stopped state during image formation. Next, the recording head section 11 moves in the opposite direction to the direction of arrow (B), and at this time, the recording paper 16 moves by N8 in the direction of arrow (C). Thereafter, image formation for one page is performed by repeating the same process. That is, N8
Images are sequentially formed for each width block.

Receiving and outputting a color image will be explained with reference to FIGS. 12A and 12B. Here, transmission and reception are for each color C.
, M, Y, and K are performed line sequentially. First, in the case of a color image, as shown in FIG. 12A, data c1Ml, Y+, ni+ (1 is the line number) received in line order is N.

Each line is sent to a color printer section to form an image, and it takes a time TPV to form one page of images.

Therefore, when reception and image formation are performed simultaneously, the recording time TPx of N8 lines (that is, one block) will dominate the transmission time, and ~transmission must also be performed in units of l blocks. On the other hand, similar processing is performed when receiving and outputting black and white images. However, as shown in FIG. 12B, data for four colors (C, , M, , Y.

Since there is only data Kt for one color instead of Kl), the data transmission for one block becomes faster, but since the TPX that forms one block of image is the same as for a color image, the free space for transmission increases. The time TPY for sending one page is the same as for color images.

Processing of this Example> An overview of the operation of the image transmission apparatus of this example will be described with reference to FIG. The operations can be roughly divided into three types: copying, sending, and receiving, and if further divided into 17 types as shown in FIG. 5B.

First, among these, the normal (normal) which does not use the memory section 5
Copy, send, receive (corresponds to mode 0゜1.2)
Briefly explain the operation.

In normal copy (mode O), the image reading section 3, the control section 6, and the image forming section 4 are in the active state, and the control section 6 is activated.
controls the data bus to connect the image reading section 3 and the image forming section 4. Regarding data bus control, please refer to the fifth
This will be explained in detail later focusing on Figure A. The image reading section 3 reads an image (color image or monochrome image), and sends image data to the image forming section 4 via the control section 6, and the image forming section 4 forms and outputs an image based on the image data.

In normal transmission (mode 1), the image reading section 3, the control section 6, the encoding/decoding section 2, and the transmission path control section 1 are in the active state, and the control section 6 performs encoding/decoding with the image reading section 3. The data bus is controlled to connect section 2. The image reading unit 3 reads the image and sends the image data to the encoding/decoding unit 2 via the control unit 6. The encoding/decoding unit 2 encodes the image data and converts it into transmission data, and transmits the image data to the transmission path. Control part l
receives and receives the transmission data, and sends the transmission data to the receiving side while coordinating the timing with the image transmission device on the receiving side 6. In normal reception (transmission 2), the transmission path control unit 1 and the encoding/decoding unit 2, the control section 6, and the image forming section 4 become active, and the control section 6 controls the data bus for connecting the encoding/decoding section 2 and the image forming section 4. Received data is input to the transmission path control unit 1 via the transmission path, and is encoded/
The image data is decoded by the decoding section 2 to become image data, and the image data is sent to the image forming section 4 via the control section 6 to form and output an image.

Next, the case of copying, sending, and receiving using the memo 9 unit 5 will be explained for color images and monochrome images, respectively. In this case, the active part is the memory part 5.
It is the same as in the case of Ci normal copy, transmission, and reception, except that . Also, for color images, cyan C
.

It will be handled as four-color data: magenta M, yellow Y, and black, and black and white images will be handled as black I (only).

In memory copying of a color image (mote 11), the control unit 6 controls the data bus to connect the image reading unit 3, memory unit 5, and image forming unit 4, and the image reading unit 3 reads the color image and copies each color. The color image data of C1M, Y, and C1 are sent via the control unit 6 to the C memory 7, M memory 8, Y memory 9. Each horn was recorded on the 10th day of the year (No. 18).

On the other hand, the image forming section 4 outputs the image forming section g I5', 2 according to the image forming section g I5',
．． Color images are read out from 9 and 10 via the control unit 6, and color images are successively formed.

Note that a configuration that allows simultaneous writing and reading to the memories 7.8 and 9.10 will be described later using FIG. 5A.

For memory copying of black and white images (hardware 12), the control unit 6
controls the data bus to connect the image reading section 3, memory section 5, and image forming section 4, but this is different from the case of the mote 11. This will be discussed later using FIG. 5A. The image reading section 3 reads a monochrome image, and the monochrome image data is written into the memory 10 in the memory section 5 via the control section 6. At this time, the image forming section 4 controls the image forming speed to 6. For now, read the black and white image data from 10 to τ, and see i), j l, - (-form a black and white image, one output for one page of image). If there is only one page of black and white images, 1<multiple series*jC-'(F) When copying, the image reading section 3 reads the images successively for each page, and stores the images in the memory section 5 (memory 10.Y memory 9. M memory 8゜0
Write page by page in the order of page number 7 (note that when 5 or more pages have been written, write to the memory 10 again), and write to the memory 10 of the image forming unit 4 as well. Y memory 9゜M memory 8. The C memory 7 is read out in order, and black and white images are formed page by page and output continuously.

In color image memory transmission (mode 13), the control unit 6
controls the data bus so as to connect the encoding/decoding section 2, the image reading section 3, and the memory section 5. Mode 11 for reading color image data and writing it to the memory section 5
In the same state, reading from the memory unit 5 is performed by the transmission line control unit 1.
and the processing speed (transmission speed) of the encoding/decoding section.The color image is encoded by the encoding/decoding section 2, and outputted to the transmission path by the transmission path control section 1 at the appropriate timing. Sent.

In memory transmission of monochrome images (mode 14), reading of monochrome data and writing to the memory section 5 are the same as in mode 12, and reading from the memory section 5 is performed at the memory 10°Y memory 9 according to the transmission speed. ．． M memory8. C memory 7
The encoding/decoding section 2 encodes the black and white image data, and the transmission path control section outputs the data to the transmission path for transmission.

During memory reception of color image data (mote 15), the control section 6 controls the data bus to connect the encoding/decoding section 2, the memory section 5, and the image forming section 4. The transmission path control unit 1 receives transmission data from the transmission path, and the encoding/decoding unit 2 decodes the color image data (C+, M+, Y
+, +; i is the line number) is written into each color memory 7.8, 9.10 in the memory section 5 via the control section 6.

On the other hand, the image forming section 4 is connected to the memory 7.8,
9. Read out the color image data of 10, form a color image, and output it.

The timing for continuous reception in this mode is shown in FIG. 3. The reception of the first page is written into the memory section 5 at time Tc. At this time, the memory 7 in the memory section 5
．． Since the writing speed of 8, 9, and 10 is sufficiently faster than the transmission speed of the transmission line, the time Tc corresponds to the transmission time of one page of color images. On the other hand, the output starts reading from the memory unit 5 and forming the image a little later than the start of reception, and the time T p
Press y to finish reading the image for the first page. During this time, the transmission path control unit 1 requests the sending side to wait, and after the reading is completed (or when writing to the memory unit 5 becomes possible), issues a transmission request to the sending side, and similarly requests the sending side to send the second page. Receives and outputs. The same process is performed for the next page.

In memory reception of monochrome image data (mode 16), the control unit 6 controls the encoding/decoding unit 2, the memory unit 5, and the image forming unit 4.
Control the data bus to connect. Transmission path control
receives the transmission data from the transmission line and writes the black and white image data (Kl, 1 is the line number) decoded by the encoding/decoding section 2 into the memory 10 in the memory section 5 via the control section 6. . On the other hand, the image forming section 4 reads the black and white image data from the memory 10 via the control section 6, forms a black and white image, and outputs it.

The timing for continuous reception in this mode is shown in FIG. 4. The first page reception is written into the K memory 10 approximately at time Tc/4. This is because the amount of black and white image data is set to 1/4 of the amount of color image data here. On the other hand, the output reads data from the memory 10 and starts image formation a little later than the start of reception, and the time Tpy
The reading of the image for the first page ends.

Reception of the second and subsequent pages is performed continuously up to the fourth page after the reception of the first page, and the second page is stored in Y memory 9.3.
The fourth page is sequentially written into the M memory 8. The fourth page is sequentially written into the C memory 7, and the time required is approximately Tc, which corresponds to writing one page of color images. Output is also sequential Y memory 9. M
The memory 8°C is read out from the memory 7 and an image is formed. After the 5th page, memory 10. Y memory9. Images are written to the memories from which image reading has been completed in the order of M memory 8 and C memory 7. Therefore, when receiving more than 5 pages, a wait request is issued to the sending side.

There are other modes from mode 3 to mode 10,
These are a mode in which image data read by the image reading unit 3 or received image data is temporarily stored in the memory unit 5 without transmitting or forming an image, and a mode in which image data in the memory unit 5 is read out and transmitted or image data is formed. It consists of modes.

Among these, mode 3 and mode 9, or mode 4 and 1,000 to 1,000 dollars
By using O, even if the image reading section 3 has an image reading speed slower than the transmission speed of the transmission path, the capacity of the transmission path can be fully used up to a certain number of pages.

FIG. 5A is a block diagram of the inside and peripheral parts of the control section 6, and FIG.
Figures A, 7A, and 8A are basic configuration diagrams of a part of the path switcher in Figure 58, and Figure 6B.

FIG. 7B and FIG. 8B are explanatory diagrams of the operation of a part of each bus switcher, and the flow of bus control and image data for each mote will be explained.

In FIG. 5A, reference numeral 11 indicates a load roller section which controls the modes and timings of the respective sections 1 and 2.degree. 3.4, and controls each section within the control section 6;
9.10 is an address generation section that generates the write address ΔDW; 13 is an address generation section that generates the read address ADR of each color's memory 7.8, 9.10; 14 is a write section of each color's memory 7.8.9.10 chip select signal C
5W, = C3W4 and read chip select code C3R
,=C3R4, 15 is the data bus CT, MT, Y of the encoding/decoding unit 2)'.
T, I(,- and Otsuin, A) 1. The 1st 'j'''-tough format conversion unit converts the data format; 16 converts the data from the image reading unit to the data bus C, , M;
A second data format converter 17 converts the format of data flowing to the data buses CP, MP, Yp, and Kp into data for the image forming unit 4. A format conversion unit 18 is a data bus Ct, MT,
YT, Kt and memory write data bus D B W
A first bus switcher 19 controls the connection between data buses 1 to 4 and the memory read data bus DBRI-4.

The second bus switcher unit controls the connection between Y, KR and memory write data buses DBW1 to DBW4. Among the 6-Tabacus DBR1 to 4; Hardwood 1. b) Ipij'jξ) shaku l12, De Kubas C
P.M.

Yr, Kp and 1f, left-K) are part of the third bus switcher.

The basic circuit configuration of each bus switcher part 18, 19, and 20 is shown in FIG. 6Δ, FIG. 7A, and FIG. 8A.

In FIG. 6A, 21 to 35 are bus transceiver circuits (for example, they can be constructed from TTL product number 245);
6 is each signal R given to the path transceiver circuits 21 to 35.
/W,5LWO,Si,,,C.

SLM, SLY, SI-K, S
This is a case switching unit that generates T-R1 and 5LR2 in response to an instruction signal CTB8 from the controller unit 11. The operation of the bus l-transceiver circuit follows the function table shown in FIG. 9A. In FIG. 7A, 40 to 46 are bus driver circuits (for example, TTL product numbers 241 and 541).
), 47 is each signal SLn, 5i=C given to the bus driver circuits 40-46.

A case switching unit generates SLM, SLY, and SLK (here, there are signals with the same names as those shown in FIG. 6A, but they are different signals) in response to an instruction signal CTB 9 from the controller unit 11. It is. Note that the operation of the path driver circuit follows the function table shown in FIG. 9B.

In FIG. 8A, 50 to 64 are bus driver circuits similar to those in FIG. 7A, 65 is an inversion circuit, and 66 is a bus driver circuit for each signal S L to be applied to the bus driver circuits 50 to 64 and the inversion circuit 65
R, S L n, S L C.

SLM, SLY, SLK (here again, there are signals with the same names as those in FIGS. 6A and 7A, but they are different) as an instruction signal CTB 10 from the control roller section 11. This is a case switching section that occurs depending on the case. Incidentally, the operation of the bus driver circuit 50 H-64 is the 9th B.
According to the function table in Figure 7, Figure 5B shows 1. J. Bus access status in each mode and each bus switcher part 18, 19
．． Case No. 20 is shown. Incidentally, the state of each signal and the operating state of each path switcher unit 18, 19, and 20 according to the case NO are shown in FIGS. 6B, 7B, and 8B, respectively.

The controller 9 unit 11 receives instructions from the operating unit, etc., or receives instructions from the image transmission device on the transmitting side, sets the optimum mode, and operates according to the set mote. Each part 1, 2, 3.4, data format conversion part 15, 16.17, bus switcher part 18, 19.
20, the address/response generating section 12.13, and the chip I/noctor section 14 through the control bus CTBI-CTB14.

In mode O, the control knob section 11 outputs the output of the depth selector section 14 via the CTB 14 to the write chip set 1 t-cswi-4 and the output chip 1 knob C3R1 to C3R1 to 4. to non-active (l
(high level), and stops the address generation section 12.13 via the CTB 12.13. In other words, the memory 7.8°9°IO of each color is the write data bus DBW.
1 to 4 and the read data bus DBR1=4 are in a non-access state.

In mode O, the image data is transferred from the image reading section 3 to the second data format [-format 1-] via the conversion section 16.
Data bus Cn for each color C, M, Y,
IV! It flows randomly to R, Yn, and KR. Second
Bus switcher part 19 has case number 1 f' C, data bus C, 2M□Y++, KRCi@'
! Hass L” Fiba 40.41.

42. 46th order/intermediate τ each write data bus Di3W
1. DBW2. DBW3. Connect with DBW4. on the other hand,
For the write data bus DBWI-4, the first bus switcher part 18 has a case number of 7 and is in a non-access state, and the third bus switcher part 20 has a case number of 1 and is in an access state, so the DSWI is DBW2 is connected to data bus Ci' through bus drivers 50 and 58, DBW2 is connected to data bus Mp through bus drivers 51 and 59, and DBW3 is connected to data bus Y through bus drivers 52 and 60. , DBW4 are connected to the data bus Kp via bus drivers 53, 64. Therefore, data buses CR, MRYR, and KR are data buses Cp and Yp, respectively.
, Kp, and the image data is format-converted by a third data format converter 17 to match the image forming unit 4 and output.

In the mode l (normal transmission), the image data from the image reading section 3 is sent to the second data format converting section 16, and the data C, M, Y, K of each color is transferred to each data bus CR,
Flows to MR, YR, and KR. 2nd bus switcher 19
In case No. 1, the first bus switcher 18
Since case NO is in the state of 5, each data bus CR.

MRYR, KR are write data buses DBWI DB
W2 DBW3. DBW4 is connected to the data bus 0 through the path transceiver circuit 28, 21 in the first path switch section 18, and DBW2 is connected to the data bus 0 through the path transceiver circuit 29, 22. MT, DBW3 is connected to data bus Y through path transceiver circuit 30.23,
DBW4 is connected to data bus KT via a path transceiver circuit 31.27. Therefore, each color data bus C
R, MR, YR, KR and data bus 07. M, YT,
The image data C, M, and Y are converted to a format suitable for the encoding/decoding unit 2 by a first data format converting unit 15 and outputted.

In mode 2 (normal reception), the image data encoded by the encoder/decoder 2 is format-converted by the first data format converter 15, and the data of each color C, M,
Y, K are the respective data buses CT, MT, Yt, K
Flows to T. 2nd bus switcher part 19 is case no.
is in a non-access state for the write data buses DBW1 to DBW4 at 3, and the first . 3rd bus switcher part 18゜20 both case number is 1 and write data bus DBW
1 to 4 are in an access state.

The data bus 0 is connected to the write data bus DBWI via a path transceiver circuit 21.28 in the first bus switcher part 18, and the data bus MT is connected to the write data bus DBW via a path transceiver circuit 22.29.
2, the data bus Y1 is connected to the write data bus DBW3 via the pass transceiver circuit 23.30, and the data bus 1 is connected to the pass transceiver circuit 27.
1 to the write data bus DBW4. On the other hand, DBW1 to DBW4 are connected to data buses Cp M pYp and Kp of each color, as in mode O. Therefore, each data bus CT, MT, Y, .
A third data format converter 17 is connected to MPYp and Kp, respectively, and the received image data C, M, and Y are connected to MPYp and Kp.
The format is converted in accordance with the image forming section 4 and output.

Next, modes in which each of the memories 7.8 and 9.10 are used will be explained. In modes 3 to 10, each memory 7.8, 9
．． Reference numeral 10 indicates an access state to one of write data buses DBWI-4 and read data buses DBR1-4, and a non-access state to the other.

In modes 11-16, both DBWs 1-4 and DBRs 1-4 are accessed. Therefore, modes 3 to 1
Since the operation of 0 is included in the operation of modes 11 to 16,
Only modes 11 to 16 will be explained.

In Mo I'll (Color Image Coby), Pass Switcher Part 18, 19, 20 are respectively Case No. 7
．． 1.3, and write data bus D B W 1~
4 receives data only from each of the data buses CR, MRY, .
Data is written to M and Y at the same time, and read data buses DBR1 to DBR4 are used to read data from each color memory 7.8 and 9.10 simultaneously to C, M and Y, and to data bus DBR1 for read. 4, the data buses Cp, Mp,
Yr, l (flow data only to P.

Note that inside the third bus switcher part 20, the bus driver circuits 54 to 60.64 are active. On the other hand, before receiving data input, the chip select section 14 receives the write chip select signals CSW, -CS in response to an instruction (CTB) 14 from the control section 11.
W, and chip select signal for REET CS R+~C
5R4 to the active (LOW) state, and the address generation units 12 and 13 receive the instruction signal CT from the controller unit 11.
Write address ADW by B 12°CTB 13
The read address ΔDR is initialized to the start address, and the write enable signal ENW and read enable signal ENR are made inactive (old gt1).

When data input begins, the second data format converter 16 outputs data to the CT B 6 at a timing that matches the data transfer rate from the image reading unit 3, and converts the data to the controller unit 1.
1 sends the timing to the atl female generator 12 via CTB l 2, and the address generator 12 increments the write atl nos ΔDW in accordance with the data transfer timing. /1・ and also write at 1/s ADW
The write enable signal ENW is kept active (LOW) for a certain period of time and inactive (flight) for a certain period of time, and image data is sequentially written into the memories 7.8 and 9.10.

Image data is read at a timing that corresponds to the data transfer speed of the image forming section 4. The third data format conversion section 17 receives the timing from the image forming section 4 and converts the CTB
7. It reaches the address generating section 13 via the controller section 11°CTB 13, and the address generating section 13 increments the read address ADR and makes the read enable signal ENR active (LOW). Note that if the writing speed (image input speed) is faster than the reading speed (image output speed), the start of reading 1 may be at the same time as the writing start. : If the writing is slow, it is delayed by a certain period of time from the writing start time.

In mode l:3 (memory transmission of color images), the bus switcher part 18, 19, 20 respectively case number is 3
,l. Undefined, mode 11 is used for inputting images from the image reading section 3 and writing to memories 7.8, 9.10.
The mode is the same as in mode 11, except that the reading from the 7th, 8th, 9th, and 10th positions is performed in synchronization with the transmission speed of the encoding/decoding unit 2.

Note that the data transfer to the image forming section 4 is stopped by the third data format converting section 17.

Moreover, the inside of the first bus switcher part 18 includes buses 1 to 18.
Of the transceiver circuits, only 32-35.21 to 23.27 become active, and data from each of DBR1 to DBR4 is transferred to data buses CT and M.

Y,, flow to KT.

In mode 15 (memory reception of color images), bus switcher parts 18 and 19.20 are case numbers 1 and 3 respectively.
．． 3, and the reception of images from the encoding/decoding unit 2 is the same as in mode 2, except that the writing timing corresponds to the transmission speed of the received image regarding writing to the memories 7.8 and 9.10. is the same as mode 11, and reading from memories 7.8, 9.10 and image output are the same as mode 11.

In mote 12 (memory copy of black and white images), bus switcher parts 18, 19 and 20 have case numbers 7 and 2, respectively.
．． 4, the write data buses DBW1 to DBW4 receive and take data only from the data bus DR, and each color memory 10,9
, 8.7 for each page, and reversely write each color's memory 10, 9, 8゜7 to the read data bus DBR1-4.
Read each page in the order of DBR4゜DBR3, D
BR2 and DBRI are sequentially connected to the data bus Kp in page units. At this time, the inside of the bus switcher part 18 includes 46, 45, 44.4 of the bus driver circuits.
The pages are activated page by page in the order of 3 (only one is active and the others are inactive).

Therefore, the black and white image data K of the first page from the image reading section 3 flows to DBW4 via the data bus KR, the data K of the second page flows to DBW3, and the data K of the third page flows to DBW4.
data flows to DBW2, and data K of the fourth page flows to DBWI. Further, inside the third bus switcher part 20, the bus driver circuits 54 to 57 are in an active state, and the bus driver circuits 64, 60, 59, 58 are arranged in the order of page units.
become active one by one. That is, in the first page, only DBW4 is connected to the data bus Kp, in the second page, only DBW3 is connected, in the third page, only DBW2 is connected, and in the fourth page, only DBWI is connected to the data bus Kp.

On the other hand, the controller unit 11 uses the control buses CTB12 and CTB13 before reading the image data starts.
．． The address generation unit 12.13 is initialized via the CTB 14 and the address ADW is generated.

Set ADH to the start address, set ENW and ENR to inactive state, etc.), initialize the chip selector section 14 according to mode 12 (make only C5W4 of C3WI~4 active, and set C5R4 of C3RI~4 to active state). (activate).

When image data reading starts, ADW, ADR, ENW, and ENR are controlled in the same way as in mode 11, and write chip select CSW, ~CSW, and read chip select C3R, ~C3R4 are controlled by C5W4.
C3W,.

C5W2, csw, and C3R4, C3R3°C3
R2CSR becomes active one by one in this order. Note that the data buses Cp, Mp, and Yp are input to the third data format converter 17.

Of Kp, the only valid data is Kp, and Cp, M
Since P and Yp are in a high impedance state, the third data format converter 17 outputs data that makes only K valid so that the color components C, M, and Y are not given to the image forming section 4.

In mode 14 (transmission of black and white images), case NO of bus switcher part 18.19.20 is 4.2. Undefined, image input from image reading unit 3 and memory 7.8, 9.1
Writing to 0 is the same as mode 12, and reading from memory 7.8.9.10 is the same as mode 12 except that the timing is matched to the transmission speed of the encoder/decoder 2. . Further, data transfer to the image forming section 4 is stopped by the data format converting section 17.

Inside the bus switcher part 18, the path transceiver circuits 32 to 35 are always active during transmission, and only one of the path transceiver circuits 27, 26, 25, and 24 is active in the order of page units, and the first page is DBR
1, the 2nd page is DBR3 data, the 3rd page is DBR2 data, and the 4th page is DBR3 data.
The data of BR1 will be sequentially sent to whatever.

In mode 16 (receiving black and white images), the case number of path switcher part 18, 19.20 is 2.3.4, and the received image data from encoder/decoder 2 is in mode 14 and the data direction. is reversed, but the active path transceiver circuit is the same, and memory 7.8, 9
Mode 12 is the same except that writing to ゜10 is performed at a timing that corresponds to the transfer speed of the received image data, and reading from memories 7.8, 9.10 and image forming unit 4.
The output to is similar to mode 12.

In this embodiment, image data is input/output to the memory section 5, but as shown in FIG.
It is also possible to provide a memory unit 5 and input/output image data to and from the memory unit 5 in the form of encoded data suitable for transmission. Also, the first
As shown in FIG. 1, an encoding section 2c different from the encoding/decoding section 2.

The decoding unit 2d can also input and output unique encoded data independent of the transmission code to and from the memory.

Furthermore, in this embodiment, the color image data is treated as four color components: cyan C, magenta M, yellow Y, and black; however, this is not limited to the three components of red R, green G, and blue B. In this embodiment, the three components R, G, and B can be allocated to the four component data buses C, M, and Y.

In this embodiment, color image data C and M are also used.

The data width of each of Y and Y is not limited (8-bit width is shown in some bus switchers 18.19.20), but it is possible to configure it with either 1-bit width or 8-bit width.

In addition, in this embodiment, memories 7, 8, and 8 for each color C, M, Y,
9.10 is a page memory of one page, but it is also possible to have a page memory of two or more pages each. However, memory access is slightly different when handling multiple pages such as during continuous reception, but addresses ADW, ADR, and chip select C5WI N C3W, ,
This can be done by changing the way the signals C3R, . . . C3R, are generated.

Furthermore, the scanning method of the image reading section 3 and the image forming section 4 is the second one.
The invention is not limited to this embodiment shown in the figures.

In this embodiment, in the transmission of black and white image data,
It is possible to provide an image transmission device that can transmit and receive images of continuous pages at high speed.

In other words, by providing a page memory for color image data, even in an image transmission device that uses an image forming unit that requires an image formation time longer than the image transmission time of one page, data can be written to the memory within the image transmission time. This enables high-speed reception. In addition, even if you have an image reading unit that requires an image reading time longer than the image transmission time of one page, connect the transmission line after reading one page and storing it in the memory, and then transmit the image data in the memory. By reading according to the speed, high-speed transmission is possible. In particular, when transmitting and receiving monochrome images, the data bus configuration and control means that can sequentially write and read monochrome image data page by page into and from the page memory for each color enable high-speed transmission and reception that is performed by linking pages. .

[Effects of the Invention] According to the present invention, it is possible to provide an image transmission device that can shorten the usage time of a transmission path when transmitting image data by making use of the transmission capability of the data transmission path.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the schematic configuration of the image transmission device of this embodiment, Fig. 2 is a diagram showing the image scanning method in this embodiment, and Fig. 3 is a diagram showing the reception and output of color images in this embodiment. FIG. 4 is a diagram explaining the timing of receiving and outputting black and white images in this embodiment, and FIG. FIG. 5B is a diagram showing the mode and bus access of this embodiment. FIG. 6A is a block diagram showing the configuration of a part of the first bus switcher. FIG. 6B is a diagram showing the operation of a part of the first bus switcher. FIG. 7A is a block diagram showing the configuration of the second bus switcher, FIG. 7B is a block diagram showing the operation of a part of the second bus switcher, and FIG. 8A is a block diagram showing the configuration of part of the third bus switcher. 8B is a block diagram showing the operation of a part of the third bus switcher, FIGS. 9A and 9B are diagrams showing the functions of the elements used in this embodiment, and FIGS. 10 and 11 are Figures 12A and 12B are diagrams showing the configuration of an image transmission device according to another embodiment. FIGS. 12A and 12B show conventional color images. There is a diagram T explaining the timing of receiving and outputting black and white images. In the figure, l...transmission j? C control unit, 2...encoding/decoding unit, 28.2 G""Fl-'y conversion unit, 2 b
, 2 d = Pk joint, : 3... image reading section, 4
. . . Image forming section, 5 . . . Drying section, 0 . . . Control section, 7 .
...Yellow memory, 1o...Black memory, 1
1... Controller unit, 18.1.9.20... Part of bus switcher, 15, 16° 17... Format conversion unit.

Claims (1)

[Claims] (1) An image transmission device that transmits a monochrome image or a color image, which includes a plurality of storage means corresponding to each color component, and input data to the storage means depending on whether the image to be transmitted is a monochrome image or a color image. An image transmission device comprising: control means for switching output on a page-by-page basis.