JPS63208353A - Original reader - Google Patents

Abstract

PURPOSE:To eliminate useless operation of the reader in setting an original with upside down by storing once read picture information in a memory and giving error notice when the picture information is white paper information so as to inhibit the output of the memory information. CONSTITUTION:Serial output picture information from a picture read section 1 is written sequentially in a page memory 2 and inputted also to an ineffective picture detection circuit 4. The circuit 4 checks the presence of difference of contract of picture elements for each line sequentially to discriminate whether the picture information is effective or ineffective. When all the lines of one page picture information are discriminated to be ineffective, a detection signal of an ineffective picture is outputted. In receiving the detection signal, an output circuit 3 supplies picture information of the memory 2 to the post-stage and the white paper information of the memory 2 is abolished substantially. The notice circuit 5 consists of a buzzer or a lamp, is operated in response to a detection signal and informs the reading of white paper to the user residing nearby.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to a document reading device used in facsimile machines, copying machines, and the like.

As is well known in the art, in the document reading device of a facsimile machine or copying machine, when a document is placed on the document table with the document side facing up or down as specified in the device's manual,
The image on the surface of the document is read photoelectrically.

Problems to be Solved by the Invention If you accidentally turn the front and back of a manuscript upside down when writing a manuscript, the back side (blank page) of the manuscript, which has no example written on it, will be read.

This causes inconveniences such as useless blank image information being transmitted and blank copy recording paper being produced. Also, sometimes I don't notice right away that I have turned the front and back of the manuscript upside down, and I just end up looking at it.

This invention was developed in view of the above-mentioned conventional problems, and its purpose is to notify the user when blank image information is read, such as when the front and back sides of a manuscript are reversed. An object of the present invention is to provide a document reading device that eliminates waste in outputting image information.

Means to Solve the Problem Therefore, in the present invention, the image information from the image reading section is stored once in a page memory and then outputted from the output circuit, and the image information from the image reading section is an invalid document detection circuit that checks information to determine whether or not a valid image change is included within one page; and an output circuit that responds to the determination output from this detection circuit that there is no valid image change; A control means is provided to prohibit the output of image information and to issue false alarms.

If the front and back sides of the working original are incorrectly set and the blank side is read by the reading section, the image information will be judged as an invalid image (no valid image change) by the detection circuit, and in response, the above control will be executed. The means work. In other words, the blank image information remains in the page memory and is not supplied to the transmission section or recording section. Furthermore, the error notification operation notifies the user of the error in document setting.

Embodiment The figure shows the configuration of a document reading device according to an embodiment of the present invention.

The document reading unit 1 photoelectrically reads an image on a predetermined surface of a document set on a document table (not shown). The original is surface-scanned by main scanning and sub-scanning, and image information is output from the reading section 1 in the form of a serial signal.

Image information serially output from the reading section 1 is sequentially written into the page memory 2. In normal operation, the output circuit 3 operates when one page of image information has been input to the page memory 2, reads out the image information from the page memory 2, and supplies it to the subsequent transmitting section or recording section.

Further, the image information serially outputted from the reading section 1 is also inputted to the invalid image detection circuit 4. The detection circuit 4 sequentially checks each line of image information to see if there is a difference in shading between pixels that could destroy the image, and determines whether the image is valid surface information (contains a shading difference greater than a standard) or an invalid image. It is determined whether the image information is valid (there is no gradation difference), and when it is finally determined that all lines of image information on one page are invalid, an invalid image detection signal is output. Therefore, the detection circuit 4 determines that not only white paper with nothing written on it, but also paper that is colored but plain and has no written pages on it, is an invalid image. These are collectively called blank sheets.

The invalid image detection signal from the detection circuit 4 serves as an output prohibition signal to the output circuit 3 and also serves as an activation signal to the notification circuit 5.

Upon receiving the prohibition signal, the output circuit 3 does not perform the operation of supplying the image information in the page memory 2 to the subsequent stage.

Therefore, the blank image information stored in the page memory 2 is essentially discarded without being transmitted by facsimile or printed on recording paper.

The notification circuit 5 operates in response to the detection signal of the invalid image, such as a buzzer or a lamp, and notifies users in the vicinity that a blank sheet has been read.

Effects of the Invention As explained in detail above, the present invention temporarily stores the read image information in the page memory, and if this image information is blank information, it notifies an error and also stores the image information in the page memory. Since the configuration is such that it does not output to the subsequent stage,
Make a blank copy of the 6 pages.

This eliminates the waste of sending blank pages.

In addition, especially in facsimile, the above-mentioned error notification can prevent troubles in which information intended to be sent is not sent.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a document reading device according to an embodiment of the present invention.

Claims (1)

[Claims] an image reading unit that photoelectrically reads an image of a document; a page memory that stores image information for one page; an output circuit that stores image information from the reading unit in the page memory and then outputs it; An invalid original detection circuit that checks image information from a copy and determines whether or not a valid image change is included within one page, and responds to a determination output from this detection circuit that there is no valid image change. and control means for prohibiting output of image information by the output circuit and for notifying an error.