JPH03207163A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To prevent redundant data from being sent by transmitting data up to a final effective scanning line as effective data corresponding to an original by a transmitting means. CONSTITUTION:An image read means 101 reads the image of the original by scanning lines and picture element data or encoded data corresponding to the original are stored in a storage means 122. At this time, a detecting means 111 detects effective scanning lines according to the picture element data corresponding to the respective scanning lines and an address holding means 131 holds the addresses of the storage means 122. A decision means 141 decides that recording paper on the facsimile equipment on a receiver side is cut paper, a transmitting means 151 transmits data corresponding to the scanning lines as effective data. The effective data do not contain data corresponding to the lower-side blank part of the original. Consequently, the redundant data corresponding to the lower-side blank is never transmitted.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Industrial Application Fields Prior Art Problems to be Solved by the Invention Means for Solving the Problems Action Examples I. Correspondence between the example and FIG. 1 ■. Configuration of Example ■. Operation of the embodiment■. Summary of Examples■. Modifications of the Invention Effects of the Invention [Summary] Regarding a facsimile shortening device, the purpose is to avoid transmitting redundant data by reading an image of a document scanning line by scanning line and sequentially generating pixel data corresponding to each scanning line. an image reading means for outputting; an accumulating means for accumulating pixel data corresponding to the document or encoded data obtained by encoding this pixel data by an encoding means; A detection means for detecting a valid scanning line in which one pixel is a black pixel, and each time a valid scanning line is detected by the detection means, pixel data or encoded data corresponding to this valid scanning line is stored. The recording paper of the facsimile device on the receiver side is determined to be cut paper based on the address holding means that holds the address of the storage means and the information indicating the function of the receiver side that is supplied from the receiver side at the time of communication of the transmission procedure. determination means for determining whether or not the recording paper is a cut sheet; and transmitting means for transmitting pixel data or encoded data corresponding to each scanning line up to the indicated valid scanning line as valid data corresponding to the document.

[Industrial application field]

The present invention relates to a facsimile machine.

In recent years, facsimile machines that are compatible with cut paper, which use standard paper such as No. 4 in column A and No. 4 in column B, as recording paper, have become popular. In such facsimile devices, regardless of the length of the recorded area, the recording paper is ejected in response to a multi-page signal (MPS) indicating that there is pixel data for the next page, The image data is recorded on new recording paper.

[Conventional technology]

FIG. 5 shows the structure of a conventional facsimile machine.

The CCD line image sensor (sensor) 61l of the image reading unit 610 reads an image for each scanning line corresponding to a linear portion of the original 601, and the binarization unit 612 converts the image into digital data. This pixel data, which is output as pixel data corresponding to a line, is transferred to the page memory 623 by a direct memory access (DMA) control unit 622 in response to instructions from a microprocessor (MPU) 621. Stored. By repeating the image reading operation and pixel data storage operation described above, one page's worth of pixel data is stored in the page memory 623, and this one page's worth of pixel data is encoded by the compression/decompression unit 631. Later, it is transmitted via the line by the communication processing unit 632.

Here, in a facsimile machine that uses roll paper as recording paper, the pixel data supplied via the line is sequentially recorded by the recording section 633, and the above-mentioned MPS
Depending on the situation, the recorded portion of the roll paper is cut with a cutter or the like and then ejected. In this way, in a facsimile device compatible with roll paper, the length of the recording paper is determined based on the length of the received pixel data.

On the other hand, in a facsimile machine that supports cut sheets, as described above, the length of the recording paper is determined in advance, so there is no need to indicate the length of the recording paper again.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional method, even if the destination is a facsimile machine compatible with cant paper, the image reading unit 6
All of the pixel data for one page read by the device 10 is encoded and transmitted. Therefore, there is a problem in that extra transmission time is required to transmit redundant data corresponding to the lower margin of the document.

The present invention was created in view of these points, and is a facsimile ξ that avoids transmitting redundant data.
The purpose is to provide a reliable device.

[Means to solve the problem]

FIG. 1 is a basic block diagram of a facsimile apparatus according to the present invention.

In the figure, an image reading unit 101 reads an image of a document scanning line by scanning line, and sequentially outputs pixel data corresponding to each scanning line.

The accumulating means 122 accumulates pixel data corresponding to the document output by the image reading means 101 or encoded data obtained by encoding this pixel data by the encoding means 102.The detecting means 111 A valid scan line in which at least one pixel is a black pixel is detected based on the corresponding pixel data.

Each time a valid scanning line is detected by the detection unit 111, the address holding unit 131 holds the address of the storage unit 122 in which pixel data or encoded data corresponding to this valid scanning line is stored.

The determining means 141 determines whether or not the recording paper of the facsimile machine on the receiver side is a cut sheet, based on information indicating the function of the receiver side that is supplied from the receiver side during communication in the transmission procedure. When the recording paper is determined to be a cut sheet by the determining means 141, the transmitting means 151 receives an address which is indicated by the address held in the address holding means 131 in the pixel data or encoded data stored in the storage means 122. Pixel data or encoded data corresponding to each scanning line up to the valid scanning line is transmitted as valid data corresponding to the document.

[For production]

The image reading means 101 reads the image of the original for each scanning line, and the pixel data or encoded data corresponding to this original is stored in the storage means 122.

At this time, the detecting means 111 detects a valid scanning line based on the pixel data corresponding to each scanning line, and the address holding means 131 stores pixel data or encoded data corresponding to this valid scanning line. The stored address of storage means 122 is held.

Therefore, for example, when all of the pixel data or encoded data corresponding to one sheet of original is stored in the storage means l22, the address held by this address holding means 131 is the last address detected for this original. This is the address of the storage means 122 in which pixel data or encoded data corresponding to a valid scanning line is stored.

Here, if the recording paper of the facsimile device on the receiver side is cut paper, pixels corresponding to each scanning line from the first scanning line to the last valid scanning line mentioned above when reading the original image By transmitting the data or encoded data, the same recording result as when transmitting all the pixel data or encoded data stored in the storage means 122 can be obtained.

Therefore, in this case, the transmitting means 151
The pixel data or encoded data stored in the area up to the address held in the above-mentioned address holding means 131 of the storage means 122 may be transmitted as valid data.

In the present invention, when the determining means 141 determines that the recording paper of the facsimile device on the receiver side is a cut sheet, the transmitting means 151 transmits the data in the pixel data or encoded data corresponding to the document. Pixel data or encoded data corresponding to each scanning line up to the last valid scanning line is transmitted as valid data corresponding to the above-mentioned document.

On the other hand, since the pixel data or encoded data corresponding to the lower margin of the document is not included in the above-mentioned valid data, redundant data corresponding to the lower margin is not transmitted.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of a facsimile machine in an embodiment of the present invention.

Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

The image reading means 101 corresponds to the image reading section 210.

The encoding means 102 corresponds to the compression/decompression section 231.

The detection means 111 corresponds to the all-white detection section 221.

The storage means 122 corresponds to the page memory 222.

The address holding means 131 corresponds to the address holding section 224.

The determining means 141 is a microprocessor (MPU) 24
Corresponds to 1.

The transmitting means 151 corresponds to the communication processing section 232 and MPU 241.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

1-'' (Yono Shiri 4 Night In FIG. 2, the facsimile machine includes an image reading section 210 that reads an image of a document 201 for each scanning line, and a system that corresponds to each scanning line output by the image reading section 210. An all-white detection unit 221 that detects a scanning line in which all pixel data are white pixels (hereinafter referred to as an all-white line) based on pixel data, and a page memory 222 that stores one page's worth of pixel data. Direct memory access (DMA) transfers pixel data corresponding to each scan line to page memory 222.
) A control unit 223, an address holding unit 224 that holds an address of the page memory 223 corresponding to pixel data of a scanning line including at least one black pixel (hereinafter referred to as an effective line), and an address holding unit 224 used for normal communication. Compression/decompression unit 231, communication processing unit 232, recording unit 233, and a microprocessor (MPU) 2 that controls each of these units.
4l.

The above-mentioned MPU 241, image reading section 210, page memory 222, DMA control section 223, and address holding section 22
4, compression/decompression section 231, communication processing section 232, and recording section 2
33 are mutually connected via a bus.

Via this bus, the DMA control unit 223 controls the MPU 24
It is configured to transfer the supplied pixel data to the address of the page memory 222 designated by the instruction from 1.

Further, the detection result by the all-white detection unit 221 described above is M
is supplied to the PU241, and depending on the detection result,
The address specified for the DMA control unit 223 described above is supplied to the address holding unit 224, and the address holding unit 22
The contents of 4 are to be rewritten. FIG. 3 is a flowchart showing the transmission operation of the facsimile machine according to the embodiment. Further, FIG. 4 shows an example of a manuscript.

First, the image reading unit 210 of the facsimile machine reads the image of the document 201 for each scanning line (step 301), and based on the pixel data corresponding to each scanning line, the all-white detection unit 221 reads the image of the original 201 for each scanning line. A white line is detected. Based on the detection result by the all-white detection unit 221, the MPU 241 of the facsimile machine determines whether each scanning line is a valid line (step 302).
).

Here, since each of the scanning lines that are not determined to be completely white by the all-white detection unit 221 described above is a valid line containing at least one black pixel, it is necessary to detect all-white lines and to detect all-white lines. is equivalent to detecting . In the case of an affirmative determination in step 302 described above, the address to which the pixel data of this valid line is to be transferred is supplied to the address holding unit 224, and the address holding unit 224 is
is rewritten with the above address (step 303).

After this step 303 and the above step 3
In the case of an affirmative determination in step 02, the pixel data read in step 301 is transferred to the page memory 222 by the DMA control unit 223 and stored at the above-mentioned transfer destination address (step 304).

Until it is determined in step 305 that the reading operation of one page worth of images has been completed,
By repeating steps 304 to 304, one page's worth of pixel data is accumulated in the page memory 222. At this time, the address held in the address holding unit 224 mentioned above is the address of the page memo I7 2 2 2 in which the pixel data of the last valid line read by the image reading unit 210 is stored. ．． For example, if the scanning lines below the scanning line indicated by the dotted line in FIG. The address where the pixel data corresponding to this scanning line is stored is held in the address holding unit 224.

Next, the MPU 241 calls the destination facsimile device in the normal procedure, performs a pre-procedure with the destination facsimile device (step 306), and receives the digital identification signal supplied from the destination facsimile device. (D.I.
Based on S), it is determined whether the recording paper of the destination facsimile machine is cut paper (step 307).

In the case of a negative determination in step 307, after all the pixel data stored in the page memory 222 is compressed by the encoding process by the compression/decompression unit 231 as before, this compressed image data is transferred to the communication processing unit. 232 onto the line (step 308).

On the other hand, in the case of an affirmative determination in step 307, in step 310, the address held in the address holding unit 224 and the page memory 222 of the sent pixel data are
until it is determined that there is a match with the storage address in (
until the affirmative determination in step 310), page memory 222
The pixel data corresponding to each scanning line stored in is sequentially compressed by the compression/decompression section 231, and then
(step 309).

In this way, the compressed image data corresponding to the image in each scanning line up to the last valid line indicated by the address held in the address holding unit 224 is transferred to the communication processing unit 233.
Sent by . After completing step 30B or step 310 described above, the MPU 241 performs a normal transmission termination procedure (step 311), disconnects the line, and terminates communication.

In addition, when transmitting multiple manuscripts 201, for example,
Two page memories 222 and two address holding units 224 are provided, and steps 301 to 305 described above are performed alternately using the two memories 222, and each original 222 is
The address corresponding to the last valid line of 1 may be held in each of the corresponding address holding sections 224.

In this case, when an affirmative determination is made in step 310, MP
The U 241 controls the communication processing unit 232 to send out the MPS, and repeats steps 309 to 310 as many times as there are documents 201. ■． As described above, the pixel data is stored in the page memory 222, and the contents of the address holding section 224 are rewritten according to the address to which the pixel data is to be transferred, depending on the detection result by the all-white detection section 221. In addition, when the destination is a facsimile machine that supports cut paper, each scan stored in the page memory 222 is scanned until the address held in the address holding unit 224 matches the address corresponding to the transmitted pixel data. Encode and transmit the pixel data corresponding to the line. This makes it possible to encode and transmit only the pixel data corresponding to each scanning line up to the last valid line indicated by the address held in the address holding unit 224. In this case, redundant data corresponding to the margins of the document read after the last valid line will not be sent, reducing the communication time required to encode and send the redundant data. It is possible to shorten communication time. ■ Note that in the embodiment of the present invention described above, the case where pixel data is stored in the page memory 222 has been described, but the compressed image data compressed by the compression/decompression unit 231 is stored in the page memory 222. The compressed image data corresponding to the area of the document 201 above the last valid line may be transmitted as described above.

Furthermore, in "I. Correspondence between Examples and FIG. 1",
Although the correspondence between the present invention and the embodiments has been described, those skilled in the art will easily assume that the present invention is not limited to this and that there are various modifications.

〔Effect of the invention〕

As described above, according to the present invention, when the recording paper of the facsimile machine on the receiver side is determined to be cut paper, the transmitting means transmits the pixels corresponding to each scanning line up to the last valid scanning line. Since the data or encoded data is sent as valid data corresponding to the original and no redundant data is sent, no extra communication time is required to send this redundant data, and the communication time is can be shortened, which is extremely useful in practice.

[Brief explanation of drawings]

Fig. 1 is a principle block diagram of a facsimile machine according to the present invention, Fig. 2 is a structural diagram of a facsimile main machine according to an embodiment of the present invention, Fig. 3 is a flowchart showing the operation of the embodiment, and Fig. 4 is a flowchart showing the operation of the embodiment. FIG. 5 is a diagram showing an example of a document. FIG. 5 is a diagram showing the structure of a conventional facsimile machine. In the figure, 101 is an image reading means, 102 is an encoding means, 111 is a detection means, 122 is a storage means, 131 is an address holding means, 141 is a determination means, 151 is a transmission means, 201, 601 is a document, 210, 610 is an image reading section, 22I is an all-white detection section, 222, 623 is a page memory, 223, 622 is a direct memory access control section, 224 is an address holding section, (DMA) 231, 631 is a compression/decompression section, 232, 632 is a communication processing unit, 233, 633 is a recording unit, 241, 621 is a microprocessor (MPU) 611
612 is a CCD image sensor (sensor) and a binarization unit. Principle diagram of the present invention Figure 1 Embodiment 0 Structure of the facsimile machine Figure 2 Flowchart showing the operation of the embodiment Figure 3 Illustration showing an example of a manuscript Figure 4

Claims (1)

[Claims] (1) Image reading means (
101), and storage means (122) for storing pixel data corresponding to the document outputted by the image reading means (101) or encoded data obtained by encoding this pixel data by the encoding means (102). and detecting means (111) for detecting a valid scanning line in which at least one pixel is a black pixel based on pixel data corresponding to each scanning line; and detecting a valid scanning line by the detecting means (111). The storage means (122) stores pixel data or encoded data corresponding to this valid scanning line.
address holding means (131) that holds the address of a determining means (141) for determining whether or not the recording paper is a cut sheet; Transmission for transmitting pixel data or encoded data corresponding to each scanning line up to the valid scanning line indicated by the address held in the address holding means (131) in the data as valid data corresponding to the original document. A facsimile device comprising: means (151);