JPH037314B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides an image signal corresponding to an original placed at an arbitrary position on a platen, when the original is placed at a desired position on the platen. The present invention relates to a document position conversion device that converts the image signal into an image signal and outputs the image signal.

[Prior art]

2. Description of the Related Art Devices that read a document and output electrical signals corresponding to image information contained in the document include a copying machine and a facsimile machine.

FIG. 1 is an external view of a typical copying machine. In FIG. 1, a platen 2 on which a document is placed is provided at the top of a main body 1 of the copying machine, and an operation console 3 equipped with switches 3A to 3C is provided in front of the main body 1. There is. Four sizes are set on the platen 2, and the point Q
The size of the part surrounded by -A1-A2-A3 is A, and the size of the part surrounded by points Q-B1-B2-B3 is B. The same applies to sizes C and D. These sizes A to D are usually number 3 or 4 in row A and number 4 or 5 in row B of the Japanese Industrial Standards.
This is set to the size of the number.

On the other hand, the sizes A to D are displayed on the side surface of the main body 1.
A case 4 in which sheets of paper of a size corresponding to the size of the paper are stored, and a tray 5 into which the copied sheet is delivered and stored are provided.

In a copying machine having the above configuration, for example, when placing an original of size C on the platen 2 and copying with the platen cover 6 closed, the original is placed within the area set for size C. There was a problem in that the efficiency of the copying work was reduced when many manuscripts were to be copied.

In order to solve the above-mentioned problem, conventionally, as in the image processing apparatus described in Japanese Patent Laid-Open No. 51-138332, a program ( There are devices that translate or invert the image information by changing the address (parameter), converting the address, and transferring it to the storage memory. When scanning the document, the document position is detected by scanning the document with a unique pattern provided on the document table cover and detecting the unique pattern, and by converting the address based on the detected document position. Some methods correct positional deviations of documents by performing tilt correction.

However, in the image processing apparatus disclosed in Japanese Patent Application Laid-open No. 51-138332, it may be possible to translate and invert the input image information by address conversion, but since the position of the document is not detected, the platen The disadvantage is that it is not possible to correct the position of the misaligned original. Also, JP-A-56-
The image reading device described in Publication No. 120264 detects the position of the document by detecting a unique pattern with a predetermined bit interval, so if the four corners of the document do not match the unique pattern,
The problem is that the position of the document cannot be detected accurately, and therefore the tilt angle of the document cannot be accurately determined.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and
It is an object of the present invention to provide a document position converting device capable of accurately detecting the position of a document placed on a platen and converting the position of the document to a desired position.

[Structure of the invention]

Therefore, in the present invention, a document placed at an arbitrary position on a platen is separated into pixels by scanning and read, and image information corresponding to the density of each read pixel is transferred to a position indicating the position of the pixel. For each address that is stored together with information and that also stores image information, an address conversion operation is performed to at least translate, rotate, scale, or invert the document on the platen.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is an external view of a copying machine equipped with a document position converting device according to the present invention, and FIG. 3 is a block diagram of the document position converting device according to the present invention. Note that in FIG. 2, the same reference numerals are used for parts that perform the same functions as in FIG. 1.

A platen 2 provided at the top of the main body 1 of the copying machine has a width W of 330 mm and a length L of 450 mm, and is designed to be able to place originals up to the size of No. 3 in row A of the Japanese Industrial Standards. Further, in front of the main body 1, an operation console 3 equipped with switches 3A to 3C is provided. Further, the platen cover 6 has a mirror 6M installed therein on the surface facing the platen 2.

On the other hand, on the side of the main body 1, Japanese Industrial Standards A row 3
A case 4 in which sheets of size No. 4 or 4 and No. 4 or 5 in row B are stored, respectively, and a tray 5 into which copied sheets are delivered and stored are provided (see Fig. 2). ).

Next, the original reading device 7 uses an image pickup device (not shown) to scan the pixel density of 8 dots/mm (platen 2).
width W direction), scanning line density 8 lines/mm (platen 2
The document 8 placed on the mirror surface 6M of the platen cover 6 and the position of the platen 2 is separated into pixels by scanning the entire platen 2 from left to right and from bottom to top in the length L direction). , information corresponding to the shading of each pixel, that is, image information possessed by each pixel, is output to the storage device 9. The total number of pixels obtained by reading scanning is 8 x 330 x 8 x 450 = 9504000 dots, and the image information of each pixel is "2" when the pixel corresponds to the mirror surface of the platen cover 6. , when it corresponds to the white part, that is, the background part of the original 8, is "1", and when it corresponds to the image information of the original 8, it is "0".

The storage device 9 has a storage capacity of 9504000 bytes corresponding to the number of pixels of 9504000 dots, and as shown in the memory map of FIG. 4, the row addresses from address 0 to address 3599 and the column addresses from address 0 to address 2639 are It has a set matrix configuration, and assumes an orthogonal reference system in which the position of the pixel at the lower left end of platen 2 is the origin, the width W direction of platen 2 is the x-axis, and the length L direction of platen 2 is the y-axis. 1
The image information of the pixel is stored at an address corresponding to the position information representing the position of each pixel with respect to the origin (o, o) using the xy coordinates, with the pixel as a unit length. For example, the image information of a pixel with position information (o, o) is stored at row address 0 and column address 0.

When the storage of the image information of all pixels in the storage device 9 is completed, the address conversion device 10
is sequentially accessed to read the image information, and the image information of the pixel corresponding to the document placed at an arbitrary position on the platen 2 is read as the pixel information obtained when the document is placed at a predetermined position on the platen 2. It actually converts the position information corresponding to the image information of the pixel, that is, the address where the image information of the pixel is stored.

Hereinafter, with reference to the schematic diagram of the platen 2 shown in FIG. 5, the image information of the pixels obtained when the document 8 placed at an arbitrary position on the platen 2 is placed at the lower left of the platen 2 will be calculated. Let's explain the case.

The address conversion device 10 first calculates the row address G0 and column address R0 of the pixel P0 whose column address is the smallest among the image information that takes "0" or "1".
Then, the row address G1 and column address R1 of the pixel P1 having the maximum row address among "0" or image information are detected, and the inclination θ of the original 8 with respect to the platen 2 is calculated. In other words, θ=tan ^-1 (R2−R1/G2−G1).

Next, the following address conversion operation is performed on the row address G column address R of all pixels having image information that is "0" or "1", and the row address of the pixel is
Calculate the G′ column address R′. That is, G'=G×cosθ−R×sinθ−G0 R′=G×sinθ−R×cosθ−R0.

Further, the address translation device 10 outputs the image information of the pixel before address translation together with the address after address translation.

Therefore, the image information and its address outputted from the address conversion device 10 are obtained by reading the original when the original 8 is placed on the lower left position 8' of the platen 2.

In this embodiment, the image information corresponding to the original placed at a predetermined position on the platen 2 is obtained from the image information corresponding to the original 8 placed at an arbitrary position on the platen 2. may be specified arbitrarily.

In addition, by performing appropriate address conversion calculations, the original 8 placed at an arbitrary position on the platen 2 can be
Image information obtained when translating, rotating, enlarging, reducing, or inverting can be output.

〔Effect of the invention〕

As explained above, according to the present invention, image information corresponding to the pixels of the part reflected from the platen cover made of a reflective plate such as a mirror surface having a higher reflectance than the ground color part of the original, The position of the document placed on the platen can be accurately detected by the image information corresponding to the pixels, the image information corresponding to the pixels of the black part of the document, and the address information of the above image information. The inclination angle of the document can be accurately determined from the position of the document, and the image information of each pixel can be converted into an address according to this inclination angle, thereby converting the position of the document to a desired position. Can be done.

[Brief explanation of the drawing]

FIG. 1 is an external view of a general copying machine, FIG. 2 is an external view of a copying machine equipped with a document position converting device according to the present invention, and FIG. 3 is a block configuration diagram of a document position converting device according to the present invention. 4 is a memory map of a storage device constituting the document position converting device according to the present invention, and FIG. 5 is a schematic diagram of a platen of a copying machine equipped with the document position converting device according to the present invention. 1... Main body of the copying machine, 2... Platen, 3...
Operation console, 4... Case, 5... Tray, 6 Platen cover, 7... Original reading device, 8... Original, 9
. . . Storage device, 10 . . . Address conversion device.

Claims (1)

[Scope of Claims] 1. In a document reading device that optically scans a document placed on a platen and reads the document by dividing it into a plurality of pixels according to the light scanning, a reflective plate arranged to fix the original on the platen and having a higher reflectance than the background color of the original, and a reflecting plate, the background color of the original, and each pixel of the written portion of the original by the light scanning; a reading means for reading the document as image information of ternary data corresponding to the image information; and a memory having an address corresponding to the position of the platen and storing image information of each pixel read by the reading means at the address. and the storage means for storing image information corresponding to pixels at a boundary between image information corresponding to the pixels of the reflecting plate, and image information corresponding to the ground color of the document and pixels of the written portion of the document. Detecting means for detecting the position of the original from the address of the original, and address converting means for performing an address conversion calculation of the image information according to the position of the original detected by the detecting means, and converting the position of the original to a desired position. A document position conversion device characterized by converting the document position into a document.