JPH0431468B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention, for example, when restoring the compression code of input image information in a facsimile device, adds white image information to the restored so-called restored image information. The present invention relates to a white image information adding circuit that extracts a white image information as output image information.

BACKGROUND TECHNOLOGY As shown in FIG. 3, this type of conventional circuit is specially provided with counters 7 and 8 for counting the number of pixels used when adding white image information to restored image information. .

In FIG. 3, from the input section 1 to the image information restoration section 2,
The compressed code input to is restored onto the line memory 5 using the write address counter 3 and the reference address counter 4 (see restored image information _h2 in FIG. 4).

Here, if the length of one line of the restored image information h ₂ is, for example, A4 (1728 bits), the image information as shown by the restored image information serial data enable signal a ₂ and the restored image information serial data b ₂ in FIG. will be restored to.

Next, the white image information (white additional information) shown in FIG. 4 is added to both ends of the restored image information h ₂ (see FIG. 4) with one line length of A4 (1728 bits) restored on the line memory 5. A case where, for example, 160 bits of g ₂ are added to obtain output image information i ₂ with one line length of B4 (2048 bits) as shown in FIG. 4 will be explained. Furthermore, the fourth
In the figure, C2 is an output image information serial data enable signal.

First, add white image information g ₂ to the left end of restored image information h ₂ .
In order to add 160 bits, the image information control section 6 activates the counter A (160 bit counter) 7 using the activation pulse (white addition start pulse) _d2 shown in FIG.

Counter A7 starts counting the number of pixels of white image information, and when the count exceeds, it generates the count over signal pulse (white addition end/restored image information readout start pulse) _e2 shown in Fig. 4, and sends it to one pixel. ,
The image information control section 6, counter B (1728 bit counter) 8, and read address counter 9 are each inputted.

Thereby, the image information control unit 6 switches the image information source from the white image information _g2 to the restored image information _h2 . The counter B8 starts counting the number of pixels of the restored image information _h2 . Also, read address counter 9
is activated.

When the read address counter 9 is activated, the image information control unit 6 reads restored image information (restored image information with white image information added to the left end) _h2 from the line memory 5 using the output value of the read address counter 9 and outputs it. output to section 10.

When the readout of the restored image information _h2 is completed, the counter B8 counts over and one count-over signal pulse (restored image information readout end/white addition start pulse) _f2 shown in FIG. 4 is sent to the image information control section. 6 and counter A7.

Thereby, the image information control unit 6 switches the image information source from the restored image information _h2 to the white image information _g2 . at the same time,
The counter A7 is activated to count the number of pixels of the white image information, and writes the white image information _g2 to the right end of the restored image information _h2 .
Add 160bit.

In this way, white image information g ₂ is placed at both ends of restored image information h ₂
By adding , the length of one line becomes B4
(2048 bits) can be obtained from the output unit ₁₀ .

Problems to be Solved by the Invention However, with this configuration, the number of counters B8 for counting the number of pixels of the restored image information increases as the number of pixels to be counted increases. In addition, control of each counter becomes complicated. In other words, there is a problem in that the number of counters for counting the number of pixels increases, and the circuit configuration for adding white image information to restored image information becomes complicated.

The present invention has been made in view of the above-mentioned problems, and uses counters 7 and 8 for counting the number of pixels of white image information added to restored image information as in the conventional art.
It is an object of the present invention to provide a white image information adding circuit that can add white image information to restored image information without special provision.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a write address counter and a reference address counter that can preset the value of the number of pixels of white image information added to restored image information, and an all-line white Output image information to which white image information has been added is obtained by means of restoring input image information to an appropriate position in the line memory where it has been converted into image information.

Operation With the above configuration, after the line memory is set to white image information for all lines in advance, each preset value of the write address counter and reference address counter is added to the restored image information.The value of the number of pixels of the white image information. By setting the input image information to the line memory and using each of these counters,
It becomes possible to add white image information to the restored image information on this line memory.

Embodiment FIG. 1 is a schematic block diagram showing an embodiment of a white image information adding circuit according to the present invention.

In FIG. 1, 21 is an input unit for compression-encoded input image information, and 22 is an input unit for restoring the compression code of the input image information from the input unit 21 into restored image information in cooperation with the image information control unit 23. 24 is a line memory for temporarily storing the restored picture information restored by the picture information restoring part 22; 25 is a line memory address bus for managing the line memory 24; 26 is a line memory 24 and a data bus; A line memory data bus for sending and receiving, 27 an output part for output image information, 28 a read address counter for generating an address when reading data from the line memory 24, and 29 an address for writing data to the line memory 24. A write address counter 30 is a write address counter that can set a preset value to generate an address when restoring a two-dimensional compression code and when reading reference line data on the line memory 24. A possible reference address counter 31 is a preset signal line for setting preset values in the write address counter 29 and the reference address counter 30.

Next, to explain its operation, in the present invention, first, before communication is performed, the line memory 5 is in a state in which white image information is written for all lines.

Therefore, in this embodiment, as an example, pixels of 160-bit white image information (hereinafter referred to as white pixels) are added to both ends of input image information of A4 (1728 bit) line length, and 1 Line length is B4
A case of generating (2048 bit) output image information will be explained.

In addition, Figure 2 is a timing chart of the main part of Figure 1 in that case, and in the figure, a1 is a 2-line serial data enable signal (line memory clear) where the length of one line is B4 (2048 bits).
Here, clearing of the line memory 24 (writing white image information b1 for all lines in the line memory 24) is shown together with white image information b1 consisting of serial data (line memory clear).
c1 restores the two-dimensional compression code of input image information with one line length of A4 (1728 bits) and stores it in line memory 2.
4 by 160 bits (write address counter 2)
9) data to be written (hereinafter referred to as restored image information), d1 is restored image information c1
In the state of the line memory 24 before writing the line memory data, which is all line white image information b1,
For e1, the length of one line generated by writing restored image information c1 in the state of d1 is B4
(2048bit) output image information, that is, restored image information c1
This is the line memory data after being written.

The line memory 24 is in a state d1 in which all line white image information b1 is written, and at this time, when the compressed code of A4 input image information is input from the input section 21 to the image information restoration section 22, this restoration section 22 Restoration c1 of the input image information is started.

At the same time, in order to add 160-bit white pixels to both ends of the restored image information c1, the write address counter 2
9 and the reference address counter 30 are each set to a preset value of 160 bits.

Restored image information c1 restored by the image information restoration unit 22
is written to the line memory 24 from the 160th bit of the line memory 24 according to the preset value (160 bits) of the write address counter 29.

When the image information control unit 23 detects an EOL (end of line) code in the compression code and confirms that the restoration of input image information for one line (A4 length) is completed, the image information control unit 23 stores the line in the line memory 24. is switched to the next line, and the image information restoring unit 22 is controlled to start restoring the second line.

When the compression code of the input image information is a two-dimensional compression code, the reference address counter 30
While reading the input image information of the first line, which is the reference line, the input image information of the second line is restored. At this time, the reference address counter 30 is also preset to 160 bits.

When the restoration of the input image information is completed in this way, the line memory 24 stores the A4 restored image information c1 with white pixels of 160 bits each added to both ends of the A4 image B4.
Output image information e1 has been generated.

The image information control section 23 reads out the output image information e1 of B4 from the line memory 24 and outputs this output image information e1 to the output section 27.

Effects of the Invention As is clear from the above description, the present invention provides all-line white image information in the line memory in advance before communication, and stores the white pixels to be added on the line memory of this all-line white image information. By restoring input image information via a write address counter and a reference address counter with preset numerical values, output image information with white image information added to the restored image information is generated. Therefore, there is no need for a plurality of white image information addition counters for counting the number of white pixels to be added to restored image information, as in the conventional art.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a white image information adding circuit according to the present invention, FIG. 2 is a timing chart of the main parts in FIG. 1, and FIG. 3 is an example of a conventional white image information adding circuit. FIG. 4 is a timing chart of the main parts in FIG. 3. 21... Input section, 22... Image information restoration section, 23
...Picture information control unit, 24...Line memory, 27
...Output section, 28...Read address counter,
29...Write address counter, 30...Reference address counter, 31...Preset signal line.

Claims (1)

[Claims] 1. A means for restoring compression-encoded input image information;
A write address counter and a reference address counter have preset values for the number of pixels of white image information to be added to the restored image information restored by this means, and these counters and the restoration means cooperate with each other. It is characterized by comprising a means for generating restored image information to which white image information is added as output image information on a line memory that has been converted into line white image information, and reading out this output image information from the line memory and outputting it. White image information addition circuit.