JPH03179973A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To eliminate necessity at 100% for considering black in thermally designing a power source by executing recording while inverting white dots and black dots when the rate of black in one page is more than a reference value. CONSTITUTION:When picture data are written, a black dot counter 7 counts the black dots of serial data to be sent. This count receives a signal from a memory control part 6 and from the beginning of a page to the end of the page, the black dots are counted. At the end of the page, a black rate calculation part 10 inputs the count value of the black dot counter 7 and the count value of a whole dot counter 8 and calculates the black rate (%) and the calculated result is sent to a comparison part 11 and compared with the reference value (50%) set at a reference value set part 12. When the black rate is more than 50%, one input of an EX-OR becomes '1' and for the picture data as the other input, the black dot and the white dot are inverted. By recording these data, recording is executed while inverting the white dot and the black dot.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Conventional technology Problems to be solved by the invention Means for solving the problems (Fig. 1) Working examples (Fig. 2) Effects of the invention [ [Summary] Regarding facsimile machines, the purpose of this document was to improve the thermal design of facsimile machines, enable the use of compact and inexpensive power supplies, and make facsimile machines inexpensive and compact. An image memory that stores image data, a counter section that counts the number of black dots and total dots of the image data stored in the image memory, and the count output of the counter section is used to calculate -100% of the image data. A black rate judgment section that judges the black rate, a black and white dot inversion section that inverts the black and white dots of the image data stored in the image memory based on the judgment result of the black rate judgment section, and output data of the black and white dot inversion section is recorded. A recording section is provided, and the black and white dot inversion section inverts white dots and black dots and performs recording only when the black ratio of 100% of the received image data is equal to or higher than a reference value.

[Industrial application field]

The present invention relates to a factor ξ error device, and more specifically, it is used in a thermal recording type facsimile device, and in particular,
The present invention relates to a factor calculation device that has a compact power supply and can be manufactured at low cost.

C. Prior Art] In recent years, with the spread of facsimile, there has been a demand for cheaper facsimile machines to further promote its spread. Therefore, it is necessary to reduce specifications that pose no practical problems and make the device cheaper.

By the way, in the case of conventionally used facsimile machines, especially facsimile machines of the thermal recording type, when designing the heat, the continuity of the maximum load of the machine was used as a standard, and the specs were such as x all-black recording sheets. .

[Problem to be solved by the invention]

In the conventional method described above, when thermal design is carried out,
The standard was the case of recording X sheets of all black print, but this was intended for an event that occurs very infrequently in actual operation.

Therefore, there is a drawback that the margin becomes excessive and the device becomes large and expensive.

The present invention solves these conventional drawbacks, improves the thermal design of the factor extraction device, makes it possible to use a compact and inexpensive power source, and makes the factor extraction device inexpensive and compact. The purpose is to

[Means to solve the problem]

FIG. 1 is a diagram of the principle of the present invention, in which l is a file;
2 is a counter section, 3 is a black and white dot inversion section, 4 is a recording section,
Reference numeral 5 indicates a black rate determination section, 6 indicates a file control section, 7 indicates a black dot counter, and 8 indicates a total dot counter.

In order to achieve the above object, the present invention provides a facsimile machine including: an image memory 1 for storing received image data; a black dot counter 7 for counting the number of black dots in the image data stored in the image memory 1; and a total dot counter 8 that counts the total number of dots.
A black rate determining unit 5 that determines the black rate using the count output of the counter unit 2, and a result of the determination by the black rate determining unit 5,
When the black ratio is equal to or higher than a reference value, a black-and-white dot inverter 3 inverts the white dots and black dots of the image data stored in the image memory I, and output data of the black-and-white dot inverter 3 is recorded. A recording section 4 and a memory control section 6 for controlling the image memory 1 are provided.

[Effect]

Since the present invention is configured as described above, it has the following effects.

Since black rate determination of image data is performed on a page-by-page basis, page signals indicating the beginning and end of pages of image data are sent to the memory control unit 6.
The receiver takes control of the image memory.

First, when received image data is sent, it is stored in the image memory 1. During this accumulation process, the black dot counter 7 counts the number of black dots in the image data, and the total dot counter 8 counts the write clock to the image memory 1, thereby counting the total number of dots in the image data. count.

When the end of the page is confirmed by the memory control section 6, the count values of the black dot/knot counter 7 and the total dot counter 8 are taken into the black rate determining section 5, and the true black rate is determined.

Thereafter, if the judgment result is less than the reference value, the image data in the image memory 1 is read out, and the black and white dot inversion section 3 sends it as is to the recording section 4 for recording without doing anything.

However, as a result of the above judgment, if the black rate is higher than the standard value,
A black and white dot inversion section 3 inverts white dots and black dots of the image data and sends them to a recording section 4 for recording.

In this way, when the true black rate is higher than the reference value, the white dots and black dots are reversed and recorded, so it is no longer necessary to consider 100% black when thermally designing the power supply, as in the past. It disappears. Therefore, the power supply can be made more compact.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a block diagram of one embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts.

In addition, 9 is a modem, 1o is a black rate calculation section, 11 is a comparison section,
12 is a reference value setting section, and 13 is a launch circuit.

In this example, the black ratio determination unit 5 includes a black ratio calculation unit 1o, a comparison unit 11. It is composed of a reference value setting section 12 and a latch section 13. The launch circuit I3 is composed of, for example, a flip-flop circuit, and the reference value setting section 12 is composed of a memory such as a ROM.

Further, the black and white dot inversion section 3 includes an exclusive OR circuit (EX
-OR).

As the recording section 4, recording sections using various heat-sensitive recording methods are used.

Next, the operation of the facsimile machine having the above configuration will be explained.

Now, assume that a black rate of 50% is set as a reference value in the reference value setting section 12 (this setting is set, for example, during the manufacturing process of the device or when shipping the product). A page signal (a signal indicating the start and end of a page) is output and input to the memory control section 6.

The received image data is sent as serial data and written into the image memory 1.

This image memory 1 is designed to be able to write at least one page of data, and is written under write control by the memory control section 6 and stored sequentially.

When writing this image data, black dots (for example, white dots in the serial data that are sent)
At the time of "O", the black dot counts "1" of the high level with the black dot counter 7.

This count receives a signal from the memory control section 6 and counts the black dots from the beginning to the end of the page.

At the same time, since the write clock output from the memory control unit 6 when writing data to the image memory 1 is equal to all the dots (white dots + black dots) of the image data, this write clock is used as the all dot counter 8. Count with . This total dot counter also counts from the beginning to the end of the page under the control of the memory control section 6.

When the end of the page is reached, the memory controller 6 sends a determination instruction to the black ratio determining section 5 based on the received page signal. As a result, the black rate calculation unit 10 calculates the count value of the black dot counter 7 (the total number of black dots for one page) and the count value of the all dot counter 8 (the total number of white dots + black dots for one page). Calculate the black rate (%) manually.

The calculated black rate is sent to the comparator 11 and the reference value setting unit 1
2 and compared with a reference value (50%). This comparison result is latched in the latch circuit 13.

The output of the launch circuit 13 is sent to a black and white dot inverter 3;
The stored data is sent to the memory control unit 6 and read out from the image memory 1 as serial data.

0 In the black and white dot inversion section 3, for example, depending on the human power of EX-OR,
Image data and the output of the launch circuit 13 are input, processed, and then recorded in the recording section 4.

In this case, if the black rate is less than 50%, the launch circuit 13
The output becomes low level "0". For this reason, EX-
The human power on one side of the OR is rOJ, and the image data input on the other side is directly sent to the recording section 4 and recorded.

However, if the black rate is 50% or more, the output of the launch circuit 13 becomes a high level "1". For this reason, EX-O
One input of R becomes "1", and the image data that is the other input has white dots and black dots reversed.

That is, if the white dot is "0" and the black dot is "1", then
When the white dot is “0”, the EX-OR input is “0” and “1”.
”, its output becomes “1”, and when the black dot is “l”, E
The human power of X-OR is "1" and "1" and its output is "0"
Therefore, the black and white dots are reversed.

If this is recorded, the white dots and black dots will be reversed and a recording will be made (white letters or white pictures on a black background).

Although the embodiments have been described above, the present invention can also be implemented as follows.

+11 The black ratio reference value set in the reference value setting section is not limited to 50%, but may be any value such as 60% or 70%.

However, if the ratio is as high as 90%, it will not be very effective in making the power supply compact, and if it is less than 50%,
On the other hand, inversion increases the amount of heat generated, and also has the disadvantage that many images of inverted black and white dots become difficult to read.

Therefore, in normal cases, the standard value is about 50%, and it is sufficient to select a value around this standard value of 50% or a value slightly higher than that.

(2) The black and white dot inversion section may be constructed from a circuit other than EX-OR. In this case, it is only necessary to be able to distinguish between inversion and non-inversion based on the output signal of the black rate determination section.

2 [Effects of the Invention] As explained above, the present invention has the following effects.

(11) When thermally designing a power supply for a facsimile machine, there is no need to take 100% black printing into consideration, unlike in the past.

(2) Therefore, the power supply can be made compact and the price can be reduced, so it is possible to make the facsimile machine small and inexpensive.

[Brief explanation of drawings]

FIG. 1 is a principle diagram of a facsimile apparatus according to the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 1-Image memory 2-Counter section 3-Black and white tosoto inversion section 4-Recording section 5-Black rate determination section

Claims (1)

[Claims] An image memory (1) that stores received image data; a counter section (2) that counts the number of black dots and the total number of dots of the image data stored in the image memory (1); a black rate determining unit (5) that determines the black rate of one page of image data using the count output of the counter unit (2); A black and white dot inversion section (3) for inverting the black and white dots of the image data stored in (1) and a recording section (4) for recording the output data of the black and white dot inversion section (3) are provided, and the received image data A facsimile apparatus characterized in that the black and white dot inverting section (3) inverts white dots and black dots and performs recording only when the black rate for one page is equal to or higher than a reference value.