JP3318986B2 - Color image receiving device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color image receiving apparatus, and more particularly to a color image receiving apparatus capable of reducing running costs.

[0002]

2. Description of the Related Art When a received document is printed in color using a conventional color facsimile machine, the cost per sheet is as follows.
Significantly higher cost than that of conventional black and white images. However, conventionally, the necessity of the received document is not known before the printout, so that all the received documents are printed out. For this reason, there has been a problem that the running cost of the color facsimile apparatus is increased.

On the other hand, there has been proposed a system in which a display device such as a CRT or a liquid crystal panel is provided in a color facsimile apparatus so that a received document is displayed on the display device once and it is possible to judge the necessity. There is a new problem that the cost of the device is increased due to the provision of the display device.

To solve this problem, Japanese Patent Laid-Open Publication No.
In Japanese Patent Application Publication No. 4 (first prior art), a color facsimile apparatus is provided with means for instructing that data received in color be printed in a single color. While saving to memory,
A technique has been disclosed in which the received image data is converted into single-color data to perform single-color printing.

According to this prior art, a color image can be printed in a single color as required, so that running costs can be reduced. Further, when it is necessary to perform color printing after printing in a single color, the received image data stored in the memory may be read out and printed, so that a color image can be easily obtained.

Further, as a prior art related to the present invention,
There is one disclosed in Japanese Patent Application Laid-Open No. Hei 3-68275 (second prior art). In this publication, an image recording apparatus such as a printer is provided with a color recording unit and a monochromatic recording unit, and a color / monochromatic recording instructing unit for instructing whether to perform color recording or monochromatic recording, and temporarily stores the color image data. There is disclosed a technique in which color image data is converted into monochromatic data and recorded by the monochromatic recording means when monochromatic recording is instructed by the color / monochromatic recording instructing means.

In the second prior art, as in the first prior art, a color image can be easily recorded after the color image data is once recorded in a single color.

[0008]

In a color facsimile apparatus, (1) an operator instructs a color mode and a black-and-white mode to transmit, and (2) a transmitter automatically determines a color mode and a black-and-white mode. Or (3) some can only be sent in color mode.

When transmitting monochrome document information using such a color facsimile apparatus, in the case of the above (1), the color mode may be designated and transmitted due to an operator's mistake. In the case of the above (3), the data is necessarily transmitted in the color mode.

[0010] Then, the color facsimile apparatus on the receiving side receives monochrome original information in the color mode, so that it performs printing in color. And the running cost is increased. In addition,
Such a problem does not occur when the transmitter is (2).

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems of the prior art, and to provide a color image which can be printed in black and white in the case of monochrome document information even when received in a color mode.
An image receiving device is provided.

[0012]

In order to achieve the above object, the present invention provides a data storage unit for storing received color mode image data, and a method for storing color mode image data stored in the data storage unit. a color / monochrome discriminator for discriminating whether a black-and-white image or an image, wherein when the color mode image data is determined as a monochrome image by the color / monochrome determination section, multi-white the color mode image data A first feature is that a black-and-white conversion unit that converts the image data into value image data is provided. Also, the present invention provides a monochrome
A printer with a lint function and color print function
The color mode image data is printed using a monochrome printing function of a printer unit when the color mode image data is determined to be a monochrome image by the color / black and white determining unit. There is a second feature.

According to the first feature, when the transmitting side transmits the monochrome original information in the color mode, the color / monochrome discriminating section judges that the received image information is a monochrome image, and Start up and set the received image data to white
The image data is converted to multi-valued black image data. According to the second feature, when the received image information is determined to be a monochrome image, printing is performed by the monochrome printing function.

As a result, the received black-and-white original information is automatically printed in black and white, so that the running cost can be reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings.

First, the overall configuration of a color facsimile apparatus including the present invention will be described in detail with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the transmitter,
FIG. 2 is a block diagram showing the configuration of one embodiment of the receiver. Further, a thick line in the figure indicates image data, and a thin line indicates a control signal.

Reference numeral 1 denotes a panel of the color facsimile apparatus, and a key input from the panel 1 is converted into an electric signal by a panel control unit 2 and output. The scan signal output from the panel control unit 2 is input to a scanner control unit 3, which controls the operation of the scanner 5.

When an instruction to transmit document information is given from the panel 1, the document information 4 is read by the scanner 5 and converted into an electric signal. The image information converted into an electric signal is converted into a digital signal by an A / D converter 6 and sent to an IPS (Image Processing System) unit 7.

As shown in FIG. 3, the IPS unit 7 includes, for example, a shading correction unit 7a and an MTF (Modulat
ion Transfer Function) correction unit 7b and RGB → CI
It is composed of an ELAB converter 7c.

As shown in the figure, in this embodiment, the image data is converted into 12-bit signals of R (red), G (green) and B (blue) by the A / D converter 6, and the IPS Part 7
To enter. In the IPS unit 7, after the RGB 12-bit image signal is subjected to well-known shading correction and MTF correction, the RGB → CIELAB conversion unit 7c performs CIE
Converted to LAB.

The RGB → CIELAB conversion unit 7 c
The 2-bit RGB signal is converted into 8-bit L ^* , a ^* , b
^* Convert to signal. The color space used when transmitting a color image includes, in addition to the CIELAB, a YC
There are various types such as rCb, RGB, and YMC (K). In this embodiment, CIELAB is used.

The CIELAB is a well-known expression method of a color space, and the three primary colors R,
G, B (reference white is equal energy white) to CIELAB
Can be converted via the tristimulus values X, Y, and Z as follows.

[0023]

(Equation 1) Here, X0, Y0 and Z0 are tristimulus values of illumination light, and Y0 = 100.

Reference numeral 8 in FIG. 1 denotes a page mode determination unit which determines whether one page of the document information is monochrome data, color data, or data in which monochrome and color are mixed. I do. This determination is based on the L ^* , a
It can be performed by the ^* and b ^* signals. That is, L
^{The *} signal represents a luminance component, and the a ^* and b ^* signals represent color components. Therefore, when the magnitude of the a ^* and b ^* signals is within a predetermined value range, the data is monochrome data. If data within the range and data outside the range are mixed, it can be determined as mixed data.

The judgment result of the page mode judgment section 8 is stored in the page information temporary storage section 9. The page information temporary storage unit 9 sends the page information to the selector units (selection units) S1 and S2 of the encoding units 10 to 13 and the compressed data management unit 15.

Here, the page information will be described with reference to FIG. The page information includes the number of pages, the first page, the second page,... As shown in FIG.
.., And data representing each attribute of the Nth page (that is, black and white, mixed, color). One byte (8 bits) is assigned to the number of pages, and 2/8 bytes (2 bits) are assigned to each attribute. The page attributes are
For example, as shown in FIG.
0, black and white multi-value is represented by 01, mixed is represented by 10, and color is represented by 11.

FIG. 4C shows a specific example of page information, in which the number of pages is 5, the first page is monochrome binary,
The page indicates black and white multivalued, the third page is mixed, the fourth page is color, and the fifth page is black and white binary. In the figure, 00 is set to 3 to perform byte alignment.
Have been added.

Returning to FIG. 1, the configuration of the present invention will be described. Reference numeral 10 denotes a black and white binary page encoding unit, 11 denotes a black and white multi-level page encoding unit, 12 denotes a color page encoding unit, and 13 denotes a mixed page encoding unit. These encoding units 10-1
One specific example of 3 is disclosed in FIG.

That is, the black-and-white binary page encoding unit 10 comprises a binarization processing unit 10a and an MMR encoder 10b. The binarization processing unit 10a converts the 8-bit ^{L *} signal into binary to 1-bit ^{L *} signal. The MMR encoder 10b performs MMR encoding on the L ^* signal and compresses it.

The black-and-white multi-level page encoding unit 11 includes a bit plane developing unit 11a and an MMR encoder 11b. The bit plane developing unit 11a develops the 8-bit L ^* signal into a bit plane. That is, one page of data for each layer from LSB to MSB is created. The MMR encoder 11b encodes the data for each layer by MMR for each page and compresses the data.

The color page encoder 12 comprises a bit plane developing unit 12a and an MMR encoder 12b. The bit plane developing unit 12a is configured to
The L ^* , a ^* , and b ^* signals of the bit are developed on each bit plane. That is, one page of data for each layer from LSB to MSB is created for each of the L ^* , a ^* , and b ^* signals. Then, the MMR encoder 11b calculates L ^* , a
^* , B ^* MMR encoding is performed for each bit plane of the signal and compressed.

The mixed page encoder 13 comprises a binary area encoder 13a, a black and white multi-level area encoder 13b, and a color area encoder 13c. Which of these encodings is to be performed is selected based on the block information sent from the mixed page block information storage unit 14.

As shown in FIG. 6A, the block information includes the number of blocks, data representing the attribute values of 1 block to N blocks, and, as shown in FIG. 1
And data representing the area from block to N block (coordinates x, y of upper left point; coordinates x, y of lower right point). One byte is allocated to the number of blocks, 2/8 bytes are allocated to the attribute value, and 8 bytes are allocated to the area.
As the attribute values, as shown in FIG. 11C, 01 represents multi-valued black and white, and 11 represents color.

FIG. 4D is a conceptual diagram showing an example of a mixed page. Assuming that the black and white multivalued in the conceptual diagram is the first block and the color is the second block, the block information is as shown in FIG.
, The number of blocks is 2, the attribute value of the first block is 01, the attribute value of the second block is 11, and
The data representing the area of each block is as shown in FIG.

The compressed data storage unit 18 in FIG. 1 stores the data encoded by the encoding units 10 to 13 or the block information output from the mixed page block information storage unit 14 from the compressed data management unit 15. In accordance with the address management information.

The compressed data stored in the compressed data storage unit 18 is modulated by the modem unit 19, and is modulated by the NCU unit 20.
Is sent to the line via. The modem unit 19 is controlled by the protocol control unit 16 and the NCU unit 20 is controlled by the network control unit 17 as in the related art.

Next, the configuration of the receiver of the color facsimile apparatus of the present invention will be described with reference to FIG.

Reference numeral 21 denotes an NCU unit, 22 denotes a modem unit, 23 denotes a compressed data storage unit, and 24 denotes a color → monochrome conversion unit.
The color-to-black and white conversion unit 24 inputs L ^* , a
It is only necessary to extract the L ^* signal which is a luminance signal from the ^* and b ^* signals, and color-to-black and white conversion can be easily performed.

Reference numeral 25 denotes a network control unit for controlling the operation of the NCU unit 21, 26 denotes a protocol control unit, and 27 denotes a compressed data management unit. The transmitter ID and the page information are output from the protocol control unit 26 to the compressed data management unit 27.

The compressed data management unit 27 creates address management information based on the page information from the protocol control unit 26 and sends it to the compressed data storage unit 23. The storage unit 23
Are managed by the address management information.
Also, the compressed data management unit 27 stores the page information and the I
D is sent to the page information temporary storage unit 29.

The page information stored in the page information temporary storage section 29 is sent to the color / monochrome determination section 28 and the selector S3. Color / monochrome judgment section 28 only when the attribute values of the page is 11 (color), true color image der
An operation of determining whether or not there is no light, that is, a determination of color / monochrome is performed.

The color / monochrome determination section 28 operates in the same manner as the page mode determination section 8 (see FIG. 1). That is, as shown in the flowchart of FIG. 7, in step S100, the a ^* component is decoded for one page, and the process proceeds to step S101, where a ^* of all the pixels for one page is a ^*.
Whether the component is within a predetermined value range, that is, A1 <a
^* Determine whether or not A2 is satisfied.

When the judgment is affirmative, step S102
To decode the b ^* component for one page. And
Proceeding to step S103, b of all pixels for one page
^* Whether the component is within a predetermined value range, that is, B1 <
It is determined whether or not b ^* <B2 is satisfied.

When the result of step S103 is affirmative, since the magnitudes of the a * and b * signals are within a predetermined range, this page is not truly a color image, that is, black and white data. Judge that there is. On the other hand, step S1
01 or one of S103 is negative,
Proceeding to step S105, this page is truly a color image.
It is determined that the image is an image, that is, color data.

The color-to-black / white conversion unit 24 outputs a color / black
It operates only when the black-and-white discriminating unit 28 determines that the image is not really color. When it is determined that the image is color, it outputs the input image data as it is.

Reference numeral 30 denotes a monochrome binary page decoding unit;
Is a black and white multi-level page decoding unit, 32 is a color page decoding unit,
33 is a mixed page decoding unit. Reference numeral 34 denotes a block information storage unit for mixed pages.

Reference numeral 35 denotes a black-and-white printer control unit;
Is a black and white printer, 37 is a color printer control unit,
Reference numeral 38 denotes a color printer. The monochrome printer 3
6 and the color printer 38 need not be provided independently,
One printer may have a black-and-white print function and a color print function.

Next, the protocol of the receiver shown in FIG.
This will be described with reference to flowcharts in FIGS.

After receiving the call (step S1), the calling (C
If NG) is received (Yes at Step S2), the process proceeds to Step S3, where the CED command is transmitted to the transmitting facsimile machine. Next, in step S4, NSF, CS
I and DIS commands are output. At this time, NSF
(Non-standard function) The command informs the transmitting facsimile apparatus that the reception in the color mode / monochrome multi-value mode / mixed mode is possible.

In step S5, NSS, TSI, DC
Receive the S command. Since the NSS and TSI commands are optional, they may not be transmitted from the transmitter. The transmitter declares that communication in the color mode, the monochrome multi-value mode, or the mixed mode is performed by the NSS command. When the mode is not declared by the NSS command, or when the NSS command is not transmitted, the monochrome binary mode communication is performed according to the normal CCITT group 3 protocol.

In step S6, the training is performed, the TCF command is received, and if the result is good, the operation proceeds to step S9 to execute the operation of transmitting the CFR command. On the other hand, if not good, step S8
To send an FTT command.

In step S10, it is determined whether or not the NSS command has been received. If the NSS command has not been received, the flow advances to step S15 to start the monochrome binary mode communication. On the other hand, when the NSS command is received,
Proceeding to steps S11, S12 and S13, it is determined whether the notification by the NSS command is one of the monochrome multi-value mode, the mixed mode, and the color mode. And
In the case of the monochrome multi-value mode, the process proceeds to step S18, in the case of the mixed mode, the process proceeds to step S17, and in the case of the color mode, the process proceeds to step S16.

FIG. 9 shows the protocol when proceeding to the monochrome binary mode. In step S20, training is performed, and in step S21, reception of one page of image data is performed. In step S22, it is determined whether an MPS command has been received. If the determination is affirmative, the process proceeds to step S23, where an MCF command is transmitted. Then, the process returns to step S20 to prepare for receiving the image data of the next page.

When the reception of the same attribute parameter is completed, the determination in step S22 is negative, and the process proceeds to step S24. In step S24, it is determined whether or not the EOM command has been received. If the determination is affirmative, the process proceeds to step S25 to transmit the MCF command. Then, returning to step S4, the communication is continued. When the process proceeds from step S24 to S25, attribute parameters such as resolution, paper size, and communication mode (color, mixed, black and white) are changed.

If step S24 is negative, the process proceeds to step S26, where an EOP command is received, and
At 27, an MCF command is transmitted. Finally, the DCN command is received and the processing ends.

Next, a protocol when the operation proceeds to the color mode will be described with reference to FIGS. 10 and 11. FIG.

In step S31, one page of the L ^* component of the image data is received. When the reception of the L ^* component for one page is completed, the process proceeds to steps S32 and S33, where M
The PS command is received, and then the MCF command is transmitted.

Then, the process proceeds to a step S34 to shift to an operation of receiving one page of the a ^* component of the image data. When reception of one page of the a ^* component is completed, step S
Proceeding to 35, S36, receive the MPS command and subsequently transmit the MCF command.

Subsequently, the flow advances to step S37 to receive the b ^* component of the image data for one page. One of the b ^* components
When the reception of the pages has been completed, the process proceeds to step S38, and it is determined whether or not the MPS command has been received. If an MPS command has been received, step S3
Proceeding to 9, the MCF command is transmitted, and the process returns to step S31. That is, the process proceeds to an operation of receiving image data of the next page having the same attribute parameter.

If step S38 is negative, the process proceeds to step S40. Steps S40 to S44 are the same as those in FIG.
Since the operation is the same as that in steps S24 to S28, the description is omitted.

The details of the processing in step S31 are shown in FIG.
1 will be described. Step S311
In step S312, an operation of receiving one page of the first bit plane of the L ^* component of the image data is performed. When the reception of one page is completed, MPS reception and MCF reception are performed in steps S313 and S314.
The transmission operation is performed. In step S315, training is performed, and in step S316, reception of one page of the second bit plane is performed. Next, in steps S317 and S318, operations of MPS reception and MCF transmission are performed.

The same operation as described above is performed on the third to eighth bit planes. When the reception of one page of the eighth bit plane ends in step S320, the reception of one page of the L ^* component of the image data ends.

The process of FIG. 11 is the process of step S31, but the reception of one page of a ^* in step S34 is performed.
The same processing is executed in the reception of one page of b ^* in S37.

Next, a protocol when the operation proceeds to the mixed mode will be described with reference to FIGS.

In step S51 of FIG. 12, block information for one page is received. Next, in step S52,
One page of monochrome binary image data is received. At this time,
The black-and-white multi-value block area and the color block area in the page are all replaced with 0 data and sent.

In step S53, it is determined from the block information whether the first block is a color block. When it is determined that the block is not a color block, that is, when it is determined that the block is a monochrome multi-value, the process proceeds to step S54,
One block of image data of a monochrome multi-value block is received. On the other hand, when the determination in step S53 is affirmative, the process proceeds to step S55, and a receiving operation for one block of image data of a color block is performed.

The receiving operation for one block of image data of the color block is performed in steps S31 to S37 in FIG.
Therefore, the description is omitted.

In step S62, it is determined whether or not there is a block that has not been received. If so, the flow advances to step S63 to receive an MPS command. Subsequently, the process proceeds to step S64, where an MCF command is transmitted, and the process returns to step S53.

If the determination in step S62 is negative, the process proceeds to step S65. If it is determined in this step that the MPS has been received, the process proceeds to step S66, where the MCF
The command is transmitted, and the process returns to step S51. Then, block information for one page of the next page is received.

The above operation is repeated, and step S6
If the determination at 5 is negative, the process proceeds to step S67. Steps S67 to S71 are performed in steps S24 to S24 in FIG.
Since the operation is the same as that in S28, the description is omitted.

Next, referring to FIG.
51, S52, S54 and S55 (S58, S61)
Will be described in detail.

In the process of step S51, training is performed and block information is received as shown in FIG. Next, MPS reception and MCF transmission are performed, and the process ends.

In the process of step S52, training is performed and image data for one page is received, as shown in FIG. Subsequently, MPS reception and MCF transmission are performed, and the process ends.

In the process of step S54, training is performed and reception of one block of the first bit plane is performed as shown in FIG. Then MP
S reception and MCF transmission are performed. Next, training, reception of one block of the second bit plane, MPS
Reception and MCF transmission are performed. The same operation is performed in the eighth
The process is performed up to the reception of one block of the bit plane. When the reception is completed, the process of step S54 ends.

The processing in step S55 (S58, S61) is performed as shown in FIG. This process is substantially the same as step S54.

Next, a protocol when the process proceeds to the monochrome multi-value mode will be described with reference to FIGS.

In step S81, one page of image data is received. In step S82, it is determined whether an MPS command has been received. If the MPS has been received, the process shifts to step S83 to transmit the MCF. Then, the process returns to step S81 to receive the image data of the next page for one page.

If the determination in step S82 is negative, the process proceeds to step S84. Steps S84 to S88 are the same as those in FIG.
Since the operation is the same as that in steps S24 to S28, the description is omitted.

The details of the processing in step S81 are described in FIG.
It is shown in FIG. That is, training, reception of one page of the first bit plane, MPS reception, M
The CF transmission is repeated until one page of the eighth bit plane is received. When the reception of one page of the eighth bit plane ends, the process ends.

Next, the operation of the receiver (FIG. 2) of the color facsimile apparatus including the main part of the present invention will be described.

As described with reference to the flowcharts of FIGS. 8 to 15, when an image signal is received in the monochrome binary mode due to protocol communication (step S15 in FIG. 8),
As described with reference to FIG. 9, black and white binary image data is received one page at a time, and is sequentially stored in the compressed data storage unit 23.

When the image data is received in the color mode (step S16 in FIG. 8), as described with reference to FIG. 10, the image data L ^* , a ^* , and b ^* are changed for each bit plane and for each page. Are sequentially stored in the compressed data storage unit 23.

When the image data is received in the mixed mode (step S17 in FIG. 8), as described with reference to FIG. 12, the block information, the image data of the monochrome multi-value block, and the image data L ^{* of the} color block are obtained ^. , A ^* , b ^* ,
In addition, the black and white binary image data outside the block is sequentially stored in the compressed data storage unit 23 for each bit plane and each page.
Is stored.

Further, when image data is received in the monochrome multi-level mode (step S18 in FIG. 8), as described with reference to FIG. 14, the monochrome multi-level image data is stored for each bit plane and for each page. Are sequentially stored in the compressed data storage unit 23. On the other hand, control information such as a transmitter ID and page information is stored in the compressed data management unit 27 via the protocol control unit 26.

The page information temporary storage section 29 sends the page information sent from the compressed data management section 27 to the color / monochrome determination section 28. The color / monochrome discriminating section 28 is activated when the page information is notified that the currently received mode is the color mode, and the image data stored in the compressed data storage section 23 is truly color. It is determined whether or not the data is. On the other hand, when a notification other than the color mode is received, the operation of the determination is not performed.

The determination as to whether or not the data is true color data is performed by, for example, the operation described with reference to FIG. That is, the a * and b * signals representing the color components in the image data are larger than the predetermined value A1 over the entire page.
If it is smaller than A2 or larger than the predetermined value B1 and smaller than B2 , it is determined that the data is not really color data, and all or a part of one page is set to the predetermined value A.
If smaller than 1 or larger than A2, smaller than predetermined value B1
Is greater than the lowest B2 is truly determines that data of the color.

The color / monochrome determination section 28 notifies the color / monochrome conversion section 24 of the determination result. Color → black and white conversion unit 2
4 is not true color data (ie,
Upon receiving the notification that the image data is monochrome data, the image data transmitted from the compressed data storage unit 23 is converted into monochrome multivalued data. Conversely, when it is notified that the image data is truly color image data, the color-to-monochrome conversion unit 24
Performs an operation of sending the input image data to the selector S3 as it is without performing the color-to-monochrome conversion operation.

The color / monochrome discriminating section 28 also notifies the page information temporary storage section 29 of the discrimination result. When the page information temporary storage unit 29 is notified that the data is not true color data, the page attribute value of the page information is updated to a monochrome multi-value. The updated page information is stored in the selector S
Sent to 3.

The selector S3 selects the decoding units 30 to 33 or the block information storage unit 34 of the mixed page according to the attribute value of the page information.

As described above, when the color / monochrome discriminating section 28 determines that the data is not truly color data, the color → monochrome
The black-and-white conversion unit 24 performs color-to-black-and-white multi-value conversion. Also,
The selector S3 selects the monochrome multi-level page decoding unit 31 according to the page information from the page information temporary storage unit 29.

As a result, the image data converted to black and white multi-value by the color → black and white conversion unit 24 is decoded by the black and white multi-value page decoding unit 31 and sent to the black and white printer control unit 35. Then, it is printed out by the monochrome printer 36.

As described above, according to the present embodiment, when monochrome document information is transmitted in the color mode, the information can be printed out by the monochrome printer without being printed out by the color printer. Therefore, printing of monochrome document information with an expensive color printer can be prevented, so that running costs can be reduced.

In the present embodiment, when true color original information is received in the color mode, the color-to-black and white conversion unit 24 does not perform the conversion operation, so that the image data stored in the compressed data storage unit 23 is color data. The data is sent to the selector S3 as it is, and the selector S3 selects the color page decoding unit 32 based on the page information from the page information temporary storage unit 29. Therefore, the color printer 38 prints out in color. it is obvious.

[0094]

As is clear from the above description, according to the present invention, when black-and-white original information is sent in color mode from the transmitting facsimile machine, it can be printed in black and white. This eliminates the need to print out monochrome document information in expensive colors, and has the effect of reducing running costs.

[Brief description of the drawings]

FIG. 1 is a block diagram of a transmission unit of a color facsimile apparatus of the present invention.

FIG. 2 is a block diagram of an embodiment of a receiving unit of the color facsimile apparatus of the present invention.

FIG. 3 is a block diagram illustrating a specific example of an IPS unit in FIG. 1;

FIG. 4 is an explanatory diagram of page information.

FIG. 5 is a block diagram illustrating a specific example of each encoding unit.

FIG. 6 is an explanatory diagram of block information.

FIG. 7 shows a page mode determination unit in FIG.
5 is a flowchart for explaining the operation of a black-and-white determination unit.

FIG. 8 is a flowchart illustrating a protocol of a receiving unit of the color facsimile apparatus.

FIG. 9 is a flowchart showing a protocol in a monochrome binary mode.

FIG. 10 is a flowchart showing a protocol in a color mode.

FIG. 11 is a flowchart showing details of step S31 in FIG. 10;

FIG. 12 is a flowchart showing a protocol in the mixed mode.

FIG. 13 shows steps S51, S52 and S54 of FIG.
It is a flowchart which shows the detail of and S55.

FIG. 14 is a flowchart showing a protocol in a monochrome multi-value mode.

FIG. 15 is a flowchart showing details of step S81 in FIG. 14;

[Explanation of symbols]

Reference numeral 21: NCU unit, 22: Modem unit, 23: Compressed data storage unit, 24: Color to black-and-white conversion unit, 26: Protocol control unit, 27: Compressed data management unit, 28: Color / monochrome discrimination unit, 29: Page information Temporary storage unit, 31: black-and-white multi-valued page decoding unit, 32: color page decoding unit, 36: black-and-white printer, 38: color printer

Claims (4)

(57) [Claims] 1. A data storage unit for storing received color mode image data, and a color / monochrome determination for determining whether the color mode image data stored in the data storage unit is a color image or a monochrome image. and parts, in that the color mode image data when it is determined that a monochrome image by the color / monochrome determination section, and a monochrome conversion unit that converts the color mode image data to the image data of the monochrome multi-value Characteristic color image receiving device. 2. The color image receiving apparatus according to claim 1,
A printer unit having a black- and- white print function and a color print function, wherein when the color mode image data is determined to be a black-and-white image by the color / black-and-white determination unit, the color mode image data is output to the printer. A color image receiving apparatus, wherein printing is performed using a black-and-white print function of a copy unit. 3. The color image receiving apparatus according to claim 1, wherein the color / black and white determination unit does not perform a color / black and white determination operation in a mode other than the color mode. Image receiving device. 4. The color image receiving device according to claim 1, wherein the black-and-white conversion unit converts the received image data into a black-and-white image.
That the when it is determined, a color image receiving apparatus, wherein the this <br/> updating the attribute value of the page information.