JPS6019180B2 - Variable scan scanning method for facsimile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable scan reading method in which facsimiles are sent and received by fast forwarding the line-to-line margins, etc. of a document in the sub-scanning direction, thereby reducing communication time. .

In the conventional variable scanning reading system, when a solid-state element is used to read the margins of a document, white line skipping is usually performed every one to several lines.

In this case, the document is rapidly forwarded during white line skipping, and when black information is detected, the document feeding is stopped. Then, one line of document information is read. In such a conventional variable scan reading method, black information read during white line skipping is detected during white line skipping and black information is read during white line skipping. There is a slight time delay before the feed stops.

In other words, the position where the document stopped is slightly ahead of the leading edge of the detected black information. For this reason, in the conventional variable scan reading method, there is a drawback that when the white line skip changes to the black information, the beginning of the black information is omitted and read. SUMMARY OF THE INVENTION An object of the present invention is to provide a facsimile variable scanning scanning system that eliminates the drawbacks of the prior art described above and prevents missing documents when reading black information from white line skipping. be.

FIG. 1 is a block diagram showing an embodiment of the variable scanning logic system of the present invention.

In the figure, 1 is a solid-state scanning image sensor, 2 is a read control circuit, 3 is a first gate circuit, 4 is a first memory circuit, 5 is a second memory circuit, 6 is a second gate circuit, and 7 is a This is a memory control circuit. FIG. 2 is an explanatory diagram for explaining one embodiment of the present invention described above, and numeral 8 denotes a manuscript portion showing the relationship between a manuscript and a solid-state scanning image sensor that scans the manuscript line by line; 2 shows a storage circuit section in which information read from a solid-state image sensor is stored.

In the original portion 8, 9a and 9b indicate black of the original.

In addition, A,,A2,B,...,day,,day2 shows the locus of the solid-state image sensor scanning the document, and the solid line indicates that there is black information in one line, and sub-scanning is performed intermittently. The dotted line shows the trajectory when there is no black information in one line and one to several white lines are skipped. On the other hand, in the memory circuit section 10, ■ indicates the first memory circuit 4, and ■ indicates the second memory circuit 5. Furthermore, a memory circuit with diagonal lines indicates that black information is written therein. Next, the operation of this embodiment will be explained with reference to FIGS. 1 and 2.

The solid-state scanning image sensor 1 reads information from a document line by line based on a control signal from a reading control circuit 2. The read document information is sent to the gate circuit 3, switch S,
The data is then stored in one of the first and second storage circuits 4 and 5. The memory circuits 4 and 5 each have a memory capacity for one line. The switches S, , S2 are switched to have opposite phases by a signal issued from the storage control circuit 7 based on information sent from the reading control circuit 2 as to whether there is a black signal in one line. . Therefore, for example, when data is stored in the first storage circuit 4, previously stored data is read from the second storage circuit 5. Writing and reading into the first and second memory circuits 4 and 5 are controlled by control signals from the memory control circuit 7. A switch S3 separate from the switch S2 is provided on the output side of the memory circuits 4 and 5, and the switch S3 is switched to be in phase with the switch S. In addition, the gate circuit 6 is opened when there is black information in one line being scanned and allows the information to pass through, and is closed when there is no black information in one line to prevent the information from passing through. controlled by Now, if one line A of the document is read by the solid-state image sensor 1 as shown in the document portion 8 of FIG. 2, that information is stored in the memory circuit 4.

Since there is bad information in this line A, a control signal is sent from the storage control circuit 7 to the gate 6 to open the gate 6. As a result, the information once stored in the first memory circuit 4 is routed to the input side of the gate circuit 3 in synchronization with the information on the line A2 that is subsequently read, and is added to the information on the line A2. Then, the information (■ in Fig. 2) that is the sum of the information on lines A and N is stored in the first memory circuit 4.
is memorized. Thereafter, the switches S,, S2, and S3 are switched in the above-mentioned phase relationship, and the information read from the original is stored in the second storage circuit 5, and the data stored in the first storage circuit 4 is stored in the second storage circuit 5. A is read.

Next, the original is sent and line B is read. At this time, if black information is not read out in one line, white lines are skipped every one to several lines from the next line. The white information during this period is stored in the second storage circuit 5. When black information is read from the original while white line skipping is being performed, that information is written into the second memory circuit 5 and the feeding of the original is stopped, and line G is read with the original stopped. . Similarly to the above, the information on line F passes through the second gate 6 and enters the input side of the first gate 3 in synchronization with the information on line G, and is added to the information on line G. The data is written into the storage circuit 5 of No. 2. Subsequently, the switches S, , S2, and S3 are switched back to their original states.

Then, the line date and horse information read from the manuscript are summed up in the same manner as above and stored in the first memory circuit 4.
will be written to. On the other hand, information (F, 10G,), which is the sum of lines F and G that were written in the second memory circuit 5 at this time, is read out from the memory circuit 5. In this embodiment, as is clear from the above description, the information on line F, which was discarded in the conventional method, is superimposed with the information on line G and stored in the storage circuit.

As described above, according to the present invention, the black information detected during white line skipping is added to the next document information, so when the white line skip changes to black information, the black information is There is no part missing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of the embodiment.

1... Solid state scanning image sensor, 2...
・Reading control circuit, 3, 6... Gate circuit, 4,
5... Memory circuit, 7... Memory control circuit, 8... Manuscript section, 10... Memory circuit section.

〆毅” 4 Leopard 2 sides

Claims (1)

[Claims] 1. For parts of the document where black information exists, sub-scanning is performed intermittently to read each line one by one, and for white manuscript parts that do not have black information, sub-scanning is performed at high speed.
~In a facsimile variable scan reading system that skips white lines every few lines, an OR circuit in which one line of information read from a document, etc. is input to one input terminal; a first switch connected to the output side of the first switch; first and second memory circuits whose direct reading with the OR circuit is switched by the first switch;
a second switch for reading information provided on the output side of the first and second memory circuits and connected to the memory circuit that is not connected to the first switch; a third switch provided on the output side of the storage circuit and connected to the storage circuit connected to the first switch; and a connection between the third switch and the other input terminal of the OR circuit. a gate circuit connected between the two switches, writes one line of information including black information read during the white line skip to the memory circuit connected to the first switch; , the information of the one line is routed through the gate circuit to the other input terminal of the OR circuit, and the information of the one line is synchronously transmitted to the next line of document information after stopping the feeding of the document. A variable scan reading system for a facsimile machine, characterized in that data is written in the same memory circuit on the side connected to the first switch in a superimposed manner.