JPS61114651A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To attain stable detection of white paper by detecting white paper at each prescribed line number to eliminate the effect of length and dirt. CONSTITUTION:A prescribed part of a picture signal read by a read section 1 is masked as a white signal by a mask circuit 2 and inputted to a continuous black dot detection circuit 4 and a black dot circuit 5. Continuous black dots and black dots in a line are connected, compared with reference data x, y, and when the dots are the reference values x, y or below by an AND circuit 9, the result is outputted as high level. A signal inverting the white line detection signal, that is, a low level signal is a signal corresponding to the black line, which is inputted to a continuous black line detection circuit 11 and a black line counter 12, continuous black lines and black lines in a line (a) are counted, they are compared with the reference data X, Y and when they are the reference values or below, the paper is discriminated as a white paper sheet and the result is outputted to a terminal 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a facsimile machine that continuously sends documents to different destinations, and more particularly, to a method for detecting blank sheets inserted between documents.

In recent years, facsimile machines have been developed that can send documents to different recipients in succession, but a method has been proposed in which a blank sheet of paper is inserted between different documents and the number of documents, recipient's phone number, etc. are entered in advance and the documents are sent in succession. .

When implementing this method, it is necessary to detect blank pages in the document, and a simple blank page detection method is desired.

[Conventional technology]

The conventional technology will be explained below.

FIG. 2 (ta+) is a diagram illustrating a method of detecting a blank page and continuously sending documents to different destinations, and FIG.

In this continuous feeding method, as shown in FIG. 2 fa), a blank sheet Wl is placed between originals AA, BB, CC, etc. to different destinations.

Insert W2..., place it on the document table of the facsimile machine, and enter the number of originals for each of the originals to be sent in advance.
This method involves entering the recipient's phone number and sending.

That is, first, the original AA is transmitted, and when the inputted number of originals have been transmitted, a blank page detection operation is performed, and when a blank page W1 is confirmed, the next original is sent to the subsequent destination. If a blank page cannot be detected, transmission is stopped as an error.

Therefore, the accuracy of blank paper detection is important, but on the other hand, if blank paper detection is performed too strictly, an error will occur even with a slight stain, reducing the operating rate.

Figure 2 (C1) shows one method of conventional white line detection. .

This method determines a white line when the number of consecutive black dots is less than or equal to X dots (for example, 2 dots) or when the total number of black dots is less than or equal to Y dots (for example, 10 dots).

Blank page detection is an extension of the white line detection method described above.

The number of continuous black lines in one page is less than or equal to X line, or the total number of black lines is less than or equal to Y line.

2) shows an example of a white line detection circuit, in which the output signal of the reading section 1 is transferred to B, B' by a mask circuit 21.
A black dot is detected for one line of signal that passes through the line by shielding the part (hereinafter referred to as a mask), and when the above condition is met or less, a white line is defined. That is, the number of consecutive black dots is counted by the continuous black dot detection circuit 4 and compared with reference value data X by the comparison circuit 7. - Banri dot count 5
The black dots in one line are counted and compared with the reference value data y. If the result of the above comparison is less than the reference value (by the AND circuit 9), it is determined to be a white line.

Blank page detection is obtained by inverting the output 20 of the white line detection circuit and inputting it as a black line detection signal to a circuit similar to the white line detection circuit.

In the blank page detection method described above, the reference value is set based on a document size of a certain fixed length, that is, a certain number of scanning lines.

Therefore, if the document size is different, the reference value becomes an inappropriate value for the document.

[Problem that the invention seeks to solve]

Actual blank paper is not completely blank due to slight dirt, and the blank paper detection method described above, which sets a reference value for the black line on the entire blank document, may cause false detection when the document size is different. There was an issue that posed an issue.

[Means for solving problems]

The above-mentioned conventional problems include a shielding means for shielding the image signal at the side edge of the transmitted document, a means for detecting a black line in the image signal that has passed through the shielding means, and a means for counting the number of consecutive predetermined scanning lines. The problem is solved by the blank page detection method of the present invention, which has means for determining a blank page based on the number of black lines detected above for the predetermined number of scanning lines, and performs blank page detection every predetermined number of predetermined lines to determine a blank page. be able to.

[Effect]

According to the present invention, as shown in FIG. The provision of the number a has the effect of preventing misjudgment due to slight dirt and the influence of blank document size.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 (al is a block diagram showing an embodiment), and the functions of the main parts will be explained below.

2 is a mask circuit, 2a is a dot counter,
2b is a line counter.

The dot counter 2a is cleared by the line scanning (horizontal) synchronizing signal and counts the number of dot reading clocks. Each bit of the dot counter 2a is decoded to mask predetermined portions B and B'.

Similarly, the line counter 2b is cleared by the vertical synchronization signal and counts the line synchronization signal.

Mask portions A and A'. Note that the masked portion is output as a white dot.

The a-line counter 17 starts counting line synchronization signals in response to the mask completion signal for the A portion.

The black line counter 12 is cleared every time a line is counted.

The continuous black dot detection circuit 4 counts continuous black dots, holds and outputs the maximum count value in that line.

The comparison circuit 7 compares the reference value data X given by the code with the output of the continuous black dot detection circuit 4 given by the same code at the end of the line scan, and holds and outputs the result until the end of the next in-scan. .

Continuous black line detection circuit 11 and black line counter 12
receives the black line detection signal and performs the same operation as the black dot, and is compared with reference value data X and Y by comparison circuits 14 and 15, respectively.

In addition to the above, the same symbols represent the same objects throughout the figures.

The operation of FIG. 1 (al) will be explained below.

A predetermined portion of the image signal read by the reading section 1 is masked as a white signal by a mask circuit 2, and is input to a continuous black dot detection circuit 4 and a black dot circuit 5. Continuous black dots and black dots in a line are counted, respectively.
It is compared with reference value data X and y, and outputted by the AND circuit 9 as, for example, a high level when it is less than the reference value X and less than y. (White line detection) The signal obtained by inverting the white line detection signal, that is, the low level signal is a black line, and the continuous black line detection circuit 11
and are input to the black line counter 12, and the continuous black lines and the black lines in the a-line are counted, respectively.
It is compared with standard data X and Y, and if it is less than the above standard value, it is judged as a blank page.

It is output to terminal 19.

The blank page detection signal is alarmed by a control unit (not shown).

Actions such as stopping transmission are taken.

〔Effect of the invention〕

As described above, according to the present invention, since blank paper is determined for each a line, it is possible to perform stable blank paper detection by eliminating the effects of length and dirt.

[Brief explanation of the drawing]

FIG. 1 (al is a block diagram representing an embodiment of the present invention. FIG. 1(b) is a diagram illustrating the blank page detection method of the present invention.
. FIG. 2(a) is a diagram illustrating a transportation method using blank paper insertion. No. Figure, Paleoconventional. Wow, 7 detected. An example is shown in the block diagram. It is. In the figure. 2 is a mask circuit, and 2a is a dot counter. 2a is a line counter, 3 is reference value data X. 4 is a continuous black dot detection circuit. 5 is a black dot counter. 6 is reference value data y. 7.8, 14.15 are comparison circuits. 9.16 is an AND circuit. 10 is reference value data X. 11 is a continuous black line detection circuit. 12 is a black line counter, and 13 is reference value data Y. 17 is the a-line counter. 18 is a line scanning synchronization signal. It is.

Claims (3)

[Claims] (1) A facsimile device that detects a blank sheet of paper inserted between documents, including a shielding means for shielding an image signal at the side edge of the transmitted document, and a means for detecting a black line in the image signal that has passed through the shielding means. and a means for counting a predetermined number of continuous scanning lines, and a means for determining a blank page based on the number of black lines detected for the predetermined number of scan lines, and detecting a blank page for each predetermined number of lines, and determining a blank page. A facsimile device that performs the following functions. (2) Claim No. 1 that determines a black line when the number of consecutive black dots or the total number of black dots is equal to or greater than a reference value
Facsimile machine as described in Section 1. (3) The facsimile apparatus according to claim (1), which determines that the paper is blank when the number of consecutive black lines or the total number of black lines is less than a reference value.