JPH06253152A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To provide a facsimile equipment by which gradation adjustment is quickly confirmed without FAX copy. CONSTITUTION:The facsimile equipment is provided with an original read circuit 2 reading an original to be sent to generate 64-gradation picture data, a page memory 3 storing the 64-gradation picture data, a binarization circuit 4 comparing the 64-gradation picture data with a predetermined threshold level L to generate binary white/black level picture data, a threshold level revision means (CPU) revising the threshold level L in response to the operating state of a gradation key 16, a picture memory 5 storing the binary white/black picture level data, a picture control circuit 12 reading the binary white/black picture level data from the picture memory 5 and displaying the binary white/black picture level data onto a CRT 13, and a means (coding circuit 6 and modulation circuit 8 or the like) reading the binary white/black picture level data stored in the picture memory 5 at transmission and sending the data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus for transmitting / receiving image information, and more particularly to a facsimile apparatus for storing image information in a storage device before transmission and transmitting the stored image information.

[0002]

2. Description of the Related Art In a conventional facsimile apparatus, when a document is read and transmitted by facsimile, whether the document is to be read darker or darker depending on the density of the document to be read in advance by a density key or the like attached to the facsimile device.
Alternatively, it is customary to carry out facsimile transmission after setting whether to read the original thinly.

In this case, in order to confirm how much darkness is actually printed according to the density set above,
A so-called FAX copy is performed in which the original image is printed using the recording unit of the own facsimile machine. If the density of this FAX copy is not the desired density, the density is set again and the second and third times are set. Repeated fax copying was done.

[0004]

However, in the above-mentioned conventional facsimile apparatus, although the lightness and darkness of the original image can be adjusted before the facsimile transmission as described above, the confirmation cannot be made unless the FAX copy is made every time the lightness and darkness is adjusted. I can't
Not only is it time-consuming, but the copy consumes paper, which increases the paper consumption.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a facsimile apparatus capable of promptly confirming density adjustment without fax copying.

[0006]

In order to solve the above-mentioned problems, a facsimile apparatus of the present invention includes a document reading section for reading a document to be transmitted and generating multi-grayscale image data, and the above-mentioned multi-level scanner. The first memory for storing the tonal image data and the black and white 2 by comparing the multi-tone image data with a predetermined threshold value
Means for generating value image data, threshold value changing means for changing the threshold value according to the operating state of the grayscale operation unit, second memory for storing the black and white binary image data, and the second memory Display black-and-white binary image data stored in the second memory at the time of transmission, and display control means for displaying the black-and-white binary image on the display means. And a means for transmitting.

[0007]

According to the above construction, since the black and white binary image of the original to be transmitted at the density set by the density operation unit is displayed on the display means, the printing density can be changed by the set density. Whether or not it can be done can be determined by looking at the black and white image of the displayed document. Therefore, it is not necessary to print for confirmation such as FAX copying, and the density can be confirmed quickly. Further, since it is not necessary to print on the paper in this way, the consumption of paper is not increased.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the facsimile apparatus of the present invention. In the figure, reference numeral 1 denotes a control circuit for controlling the entire facsimile, which is composed of a CPU. The CPU 1 stores a ROM for storing a control program, an area for temporarily storing data, and various flags necessary for control. A RAM having a region is included.

Further, the CPU 1 is controlled by the CPU 2 via the bus 14.
Data and address are interconnected with circuits and memories such as the binarization circuit 4, the image memory 5, the encoding circuit 6, the decoding circuit 7, the modulation circuit 8, the demodulation circuit 9, the operation panel 11, and the image control circuit 12. Input and output.

In the encoding circuit 6, the black-and-white binary information stored in the image memory 5 is represented by a known method such as the MH or MR method to represent the number of consecutive white (or black) signals. Compress / encode into symbols.

The modulation circuit 8 modulates the digital image data compressed / encoded by the encoding circuit 6 into an analog image signal and sends it to the communication line 15.

The demodulation circuit 9 demodulates the analog image signal transmitted through the communication line 15 and converts it into digital image data.

The decoding circuit 7 converts the compressed / encoded digital image data into monochrome binary image data.

The printer 10 is composed of a thermal printer, an electrophotographic printer, or the like, and outputs black and white binary image information stored in the image memory 5 or black and white binary image information generated from the received image data. Print on recording paper.

The original reading circuit 2 uses, for example, 64 gradations (6
(Bit) digital image data, and the 64 gradation digital image data is stored in the page memory (first memory) 3.

The binarization circuit 4 converts the digital image data of 64 gradations stored in the page memory 3 into the CPU 1
It is converted into black and white binary image data by the threshold value L given by The threshold value L is calculated by the CPU 1 from the information specified by the grayscale key 16 on the operation panel 11 and is determined.

The image memory (second memory) 5 is a circuit for storing the black and white binary image data. The image control circuit 12 is a circuit for displaying the black and white binary image information of the image memory 5 on the CRT 13. The image control circuit 12 sequentially scans the image memory 5 and simultaneously outputs the video signal to the CRT 13 and the horizontal and vertical directions. Sync signal (HSYNC, VS
YNC) is generated. As described above, monochrome image data of black and white is stored in the image memory 5, and the image data is converted into a video signal by the image control circuit 12 and displayed on the CRT 13. One bit of the binarized image data has a value of either "1" or "0", and if it is "1", for example, it is displayed as black in the corresponding pixel on the CRT 13 and is "0". Then CRT
The corresponding pixel on 13 is displayed as white. In addition,
The black and white display may be reversed.

The CRT 13 is a low resolution monochrome CRT.
And is driven by non-interlaced scanning. Figure 2
Is a diagram showing an example of an effective display area of the CRT 13, all numbers in the figure are shown in hexadecimal numbers with "H" added at the end, and they correspond to the addresses of the image memory 5. In the effective display area of the CRT 13, one line is 80 bytes (640 dots) × 480 lines.

FIG. 3 is a diagram showing an example of the area configuration of the image memory 5 described above. 256 bytes (2048 bits) of image data can be stored in the horizontal direction, and about 1 M (256 × 4096) as a whole. Bytes are prepared.

As described above, the display area of the CRT 13 is much smaller than the capacity of the image memory 5,
Only a part of the image memory 5 is displayed on the CRT 13. Therefore, the image control circuit 12 is provided with a horizontal scan start register, a vertical scan start register, and the like in order to enable scrolling in the horizontal direction and the vertical direction, and the register values thereof are those of the operation panel 11. CP based on the operation of a scroll key (not shown)
It is set by U1.

Next, the transmission procedure of the facsimile apparatus of the present invention will be described. FIG. 4 is a flowchart showing the procedure from the reading of the document to the transmission. First, the document reading circuit 2 reads the document (step 1). Then, the read image data of 64 gradations is written in the page memory 3 (step 2).

Next, it is judged whether or not there is an original to be read (step 3), and if there is an original, step 1
Then, the document is read again. On the other hand, if there is no manuscript, it is judged whether another manuscript, that is, another file is newly read by key operation or the like (step 4), and if another manuscript exists, step 1
If there is no original to be read, the process for selecting the original to be transmitted is performed (step 5).

Next, the image data of 64 gradations of the selected original is read from the page memory 3 and converted into black and white binary image data by a threshold value L (determined by the CPU 1 depending on the operation position of the gradation key 16). Then, the image is written in the image memory 5 (step 6) and displayed on the CRT 13 (step 7).

If the image displayed on the CRT 13 does not have the desired density, the user operates the density key 16, and the CPU 1 corresponds to the operation position of the density key 16.
Changes the threshold L. The change of the threshold L is judged in step 8. If there is a change in the threshold L, the process proceeds to step 6 and the black and white binarization process is performed again with the changed threshold L and the result is displayed on the CRT 13. On the other hand, the threshold L
If there is no change in, it is determined whether the transmission key is pressed (step 9).

If the transmission key is not pressed, the process proceeds to step 8. On the other hand, if the transmission key is pressed, the monochrome binary image data stored in the image memory 5 is input to the encoding circuit 6 and encoded. , And transmit (step 10). And
It is determined whether another original is to be transmitted (step 11),
If there is another manuscript, the process proceeds to step 5, while if not, the process ends.

As described above, once the document is read, the image information is written in the page memory 3 with 64 gradations, so the image data binarized by a certain threshold L is CR.
If the density of the original document displayed at T13 is not the desired density, the grayscale key 16 of the operation panel 11 is operated to perform the binarization again with the threshold value L corresponding to the operation amount of the grayscale key 16. Processing is performed, and the monochrome binary image data is written in the image memory 5 and displayed on the CRT 13.

In this way, since the black and white binary image of the original to be transmitted with the density set by the density key 16 is displayed on the CRT 13, it is possible to determine how dark the printed image is by the set density. The judgment can be made by looking at the black and white image of the displayed document. Therefore, it is not necessary to print for confirmation such as FAX copying, and the density can be confirmed quickly. Further, since it is not necessary to print on paper in this way, the amount of paper consumed is not increased.

In this embodiment, the image is read with 64 gradations, but the present invention is not limited to this, and it is also possible to read with 34 gradations (5 bits). Although the CRT 13 is used as the display means, a liquid crystal display panel or the like may be used instead of the CRT 13.

[0029]

As described above, according to the present invention, it is possible to quickly confirm the density when adjusting the density of the original reading according to the density of the original to be read in advance.
Since the recording paper for this confirmation is not consumed, there is an effect that the recording paper and the like can be saved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a facsimile apparatus of the present invention.

FIG. 2 is an explanatory diagram showing an example of an effective display area of a CRT.

FIG. 3 is an explanatory diagram showing an example of an area configuration of an image memory.

FIG. 4 is a flowchart showing a transmission operation.

[Explanation of symbols]

 1 CPU 2 Original Reading Circuit 3 Page Memory (First Memory) 4 Binarization Circuit 5 Image Memory (Second Memory) 11 Operation Panel 12 Image Control Circuit 13 CRT 16 Gray Key

Claims (1)

[Claims] 1. A document reading unit for reading a document to be transmitted to generate multi-tone image data, a first memory for storing the multi-tone image data, and a multi-tone image data. Means for generating black and white binary image data by comparing with a predetermined threshold value, threshold value changing means for changing the above threshold value in accordance with the operating state of the grayscale operation unit, and storing the above black and white binary image data. A second memory, display control means for reading black and white binary image data from the second memory and displaying a black and white binary image on the display means, and stored in the second memory at the time of transmission. And a unit for reading and transmitting black and white binary image data.