JPH0437362A - Picture signal processing method - Google Patents

Abstract

PURPOSE:To attain picture synthesis not by signal processing of bit border but by signal processing of byte border by setting an end of a coded picture signal to be the byte border in advance. CONSTITUTION:A control section 43 receives an M<2>R coded picture signal Pm' and other M<2>R coded picture signal Qm from a picture signal input output terminal 41 and receives a control signal commanding the picture synthesis between the M<2>R coded picture signal Pm' and the other M<2>R coded picture signal Qm from a control signal input terminal 42. Then the control section 43 deletes the end three bytes of the M<2>R coded picture signal. Since an ROFB code is of ROL code X2=3 bytes, the EOFB code is deleted at this point of time and the end of M<2>R coded picture signal Pm+Wm+V(0)XN forms the byte border. Then the control section 43 adds the M<2>R coded picture signal Qm (with EOFB) to generate a synthesized picture signal Rm=Pm+Wm+V (0)XN+Qm+EOFB.

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention is applicable to the field of application, such as an image signal processing device that edits a screen installed in an information center and sent to a G4 facsimile machine. The present invention relates to an image signal processing method for encoding a raster format image signal into M''R.

[Prior art] The end of a coded image signal (EOFB=0000
The last bit of 00000001000000000001) is generally not a byte boundary, and the EOFB code is deleted from the encoded image signal P- to create another encoded image signal Q.
If connection processing is performed with m, a decoding error will occur in - boat fishing, and a 7 composite screen cannot be obtained.

For this reason, conventionally, when combining the encoded image signal Pm and another encoded image signal Q- into one screen, the encoded image signals P and Qm are first combined into the original image signal (bit-bang format) Po. After decoding into and QO, a composite screen Ro = Po +Qo is created by connecting the original picture signals Po and Qo, and the picture signal Ro of the composite picture is M''R encoded to create a coded picture signal Rm. Therefore, the encoded image signal P-
There is a drawback that there is a processing overhead of decoding and re-encoding Qm and Qm once.

In order to eliminate these drawbacks, Japanese Patent Application Laid-Open No. 64-36267
No. ``Facsimile transmitter'' transmits E from the encoded image signal.
A means for deleting the OFB code and a means for inserting an encoded image signal in which one scanning line is entirely white using a horizontal mode code at page breaks are provided, and multiple pages can be printed in the M''R encoded image signal format. Discloses a method for compositing images onto one page.

FIG. 6 is an explanatory diagram of the processing method described above.

First, the EOFB code is deleted from the encoded image signal P-.

Next, an encoded image signal Wm in which one scanning line is completely white is connected using a horizontal mode code. next.

Another encoded image signal QII is connected. Through the above processing, the encoded image signal Pa +Wm +Qs can be created.

[Problem to be solved by the invention]

However, in this method, from the encoded image signal P■ to E
When deleting the OFB code, there is a drawback that a decoding circuit (or decoding function) is required.

Also, when connecting the encoded image signal W- whose one scanning line is completely white to the encoded image signal P■ from which the EOFB code has been deleted, and when connecting the encoded image signal Qs to the encoded image signal W- In addition, since it is necessary to connect data at bit boundaries, if the connection process is implemented using software, the processing time becomes long (the dynamic steps of the connection process are large). In addition, a special codec is required to implement the connection process using hardware.

Commercially available IC codecs cannot be used. Another disadvantage is that additional hardware must be added to commercially available IC codecs.

In order to eliminate the above-mentioned drawbacks, the present invention sets the end of the pre-encoded image signal (the final focus of EOFB = 000000000001000000000001) as a byte boundary. Realize that synthesis is possible.

(Means for Solving the Problems) FIG. 1 is a diagram illustrating the creation of an encoded image signal and screen synthesis in the present invention.In the present invention, the encoded image signal P- is arranged on a byte boundary. Encoded image signal Pm'=Pal +W-+V(0) with multiple all-white scanning lines added
Create XN+EOFB.

In screen synthesis of encoded image signal Pa' and encoded image signal Q@, 3-byte E of encoded image signal Pa' is
The OFB code is deleted and connected to the encoded image signal Q- at the byte boundary.

[Function] In the present invention, as shown in FIG. 1, hardware processing is required when adding an all-white line, but in the subsequent processing, that is, the screen composition of Pl and QI+1, P −
Since +Wm +V(0)XN is a byte boundary, it can be processed by software processing.

Original screen and encoded image signal P1 corresponding to encoded image signal Pm
The relationship with the corresponding screen is shown in FIG. As shown in FIG. 2, the screen corresponding to the encoded image signal Pm' is the original screen corresponding to the encoded image signal P■ with a minimum of 2 lines to a maximum of 9 blank lines added.

[Embodiment] FIG. 3 shows an embodiment of an image signal processing device implementing the present invention. In FIG. 3, reference numeral 41 denotes an image signal input/output terminal for inputting and outputting an image signal and an M''R encoded image signal.

Reference numeral 42 denotes a control signal input terminal 43 to which a control signal is input, a control section, and 44 an encoding processing section that performs M2R encoding processing. Here, the encoding processing unit 44 uses a commercially available IC codec (
For example, the controller 43 is configured with an HD63183), and allows the controller 43 to instruct whether or not to output the EOFB code. Furthermore, when the internal encoded image signal buffer (assumed to be 1 byte) becomes full, the encoding processing section 44 becomes capable of data transfer to the control section 43 and sends out an encoded image signal reception instruction signal.

Next, the operation of the one-picture signal processing device will be explained with reference to FIGS. 4 and 5. Note that Figures 4 and 5 are combined into 1
2 is a flowchart showing the correspondence between the control section 43 and the encoding processing section 44.

First, the control unit 43 receives (Sl) a raster format image signal (scanning line group consisting of a bit button row of black=1/white=0) from both signal input/output terminals 41, and also receives a control signal. A control signal instructing conversion to a byte boundary M''R encoded image signal is received from the input terminal 42 (S2).

Next, the control unit 43 instructs initialization of the encoding processing unit 44 (S3), transfers the image signal Po to the encoding processing unit 44 (S4), and instructs M''R encoding processing without EOFB code. (S5).The encoding processing unit 44 initializes (S5).
21) Receive image signal Po L7 (S22), M”
Every time the buffer inside the R encoding processing section (S23) becomes full (S24), an encoded image signal reception instruction signal is sent to the control section 43 (S25). And M''R encoded image signal P
- (S26), and then the control section 43 receives the encoded image signal reception instruction signal from the encoding processing section 44 (S26).
Receive the M2R encoded image signal P- every time S6) (S7)
, at this point, the internal buffer of the encoding processing unit 44 contains:
There is a possibility that the end (less than 1 byte) of the M''R encoded image signal P■ remains.

Next, the control unit 43 sends the image signal Wo in which one scanning line is completely white to the encoding processing unit 44 (S8), and the M
” Instruct R encoding processing (S9). Encoding processing unit 4
4 should receive an image signal WO in which one scanning line is completely white527),
The image signal Wo is subjected to M''R encoding processing 528), and an encoded image signal reception instruction signal is sent to the control unit 43 every time the internal buffer becomes full (S29) (S30).Then, the illustrated step (S31) ) Next, the control section 43 receives the M''R encoded image signal W■ every time the encoded image signal reception instruction signal is received from the encoding processing section 44 (SIO) (Sll). At this point, the end (1
(less than a byte) may remain.

Next, the control unit 43 sends the image signal Wo in which one scanning line is completely white to the encoding processing unit 44. 44 until the encoded image signal reception instruction signal is received (assumed to be repeated N times) (S1
4) Next, the encoding processing unit 44 receives the image signal Wo in which one scanning line is entirely white N times (S32), thereby creating the M''R encoded image signal ■(0) N times 533). When the internal buffer becomes full (S34), it sends an encoded image signal reception instruction signal to the control section 43 (S35).Then, the process proceeds to step (S36).Next, the control section 43 sends an encoded image signal reception instruction signal to the control section 43. 44 receives the encoded image signal reception instruction signal (
S14) and receives the M''R encoded image signal V[0)xN (, 515). At this point, the internal buffer of the encoding processing unit 44 becomes empty.

Next, the control unit 43 instructs the encoding processing unit 44 to transmit the E○FB code (S16). Next, the encoding processing section 44
creates an EOFB code (537) and sends an encoded image signal reception instruction signal to the control unit 43 every time the internal buffer becomes full (338). Next, each time the control unit 43 receives the encoded image signal reception instruction signal from the encoding processing unit 44,
The EOFB code is received (S17). The EOFB code is
EOL code (000000000001) X 2 =
Since it has a 3-byte configuration (24-bit configuration), the internal buffer of the encoding processing unit 44 becomes empty at this point.

Next, the control unit 43 inputs MlR to the image signal input/output terminal 41.
Encoded image signal P-”-Pa +W+■(0)×N+E
Send OFB.

Through the above operations, the M''R encoded image signal P1 whose final scanning line is an all-white line and whose end of the EOFB code is a byte boundary is output to the two-image signal input/output terminal 41.

Next, the operation in the synthesis process of the M"R encoded image signal created as described above will be explained. First, the control section 43 inputs the M"R encoded image signal P1 from the image signal input/output terminal 41.
1' and the other M''R encoded image signal Qm, and also receives the M''R encoded image signal P from the control signal input terminal 42.
The receiver receives a control signal instructing the screen composition of "m" and Q-.

Next, the control unit 43 controls the M''R encoded image signal Pm'=
P+w +W+s +V(0)XN+last 3 of EOFB
Delete bytes. The EOFB code is the EOL code (00
0000000001) Since the X 2 = 3-byte configuration, the EOFB code is deleted at this point, and M"
The end of the R encoded image signal Pm +Ws +V(0)XN becomes a byte boundary. Next, the control unit 43
Add R encoded image signal Qm (with EOFB).

Composite image signal Rm =Pm +Ws +V(0)XN+Q
Create a garden + EOFB. Note that the process of deleting the EOFB code from the M2R encoded image signal Pm' described above and M"R
The process of adding the encoded image signal Qm (with EOFB) is not a bit boundary process but a byte boundary process, and therefore can be easily realized by software processing.

Next, the control section 43 connects the image signal input/output terminal 41 with M"R.
Encoded image signal R■=P+ +Wm +V(0) XN+
Send Q lock + EOFB.

Through the above operations, the M''R encoded image signal P of one composite screen is
m is output to the one-picture signal input/output terminal 41.

Note that the notation "image signal A+B" used in the above description means that one image signal A and one image signal B are continuous.

〔Effect of the invention〕

As described above, according to the present invention, a commercially available IC codec can be used, so a special decoding circuit is not required, and the hardware configuration is advantageously simplified. Furthermore, since it is possible to obtain an M''R encoded image signal at byte boundaries, it is possible to realize screen synthesis in the M''R encoded image signal format using software. That is, there is an advantage that by software processing, the last three bytes of the MzR encoded image signal at the byte boundary can be deleted and combined with other M''R encoded image signals.

Note that in the screen encoded according to the present invention, a minimum of 2 lines to a maximum of 9 blank lines are added to one original screen as shown in FIG. but.

The scanning line density of G4 facsimile terminal is approximately 8 to 16 lines/m.
Considering this, the length of the blank line is about 1 m or less, which is a negligible amount.

FIG. 6 and FIG. 5 are a flowchart that together form a single diagram. FIG.

41... Image signal input/output terminal, 42... Control signal input terminal, 43... Control section, 44... Encoding processing section.

Patent applicant: Nippon Telegraph and Telephone Corporation

Claims (1)

[Claims] Processing function for performing M^2R encoding of image signals and M^2R
In an image signal processing method using a processing function that combines multiple screens in encoded image signal format into one screen, the first process encodes a raster format image signal without an EOFB code, and the scanning line of the previous line. Subsequently, a second process encodes the all-white line without an EOFB code, and a third process determines whether the end of the encoded image signal obtained in the second process is a byte boundary. , a fourth process of returning to the second process if the third process determines that the boundary is not a byte boundary; and a fourth process of returning to the second process if the third process determines that the boundary is a byte boundary; A fifth process of adding an EOFB code to the encoded image signal is performed to create an M^2R encoded image signal in which the final scanning line is an all-white line and the end of the EOFB code is a byte boundary. An image signal processing method characterized by: