JPS63109650A - Picture reader - Google Patents

Abstract

PURPOSE:To obtain the titled device applying tilt correction processing at a high speed by providing picture information on plural areas and applying tilt correction in the unit of each area. CONSTITUTION:A storage means 2 to store picture information, a tilt command means 11 inputting the information to correct the tilt of the picture information stored in the storage means 2 are provided and the picture information stored in the storage means 2 is separated into plural areas based on the information inputted by the tilt command means 11 and tilt correction is applied to each area so as to correct the tilt of picture information by means of a picture processing means 4. Thus, the processing time is remarkably reduced by applying tilt correction at each area unit.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to CC used for electronic files and facsimiles.
This invention relates to an image reading device such as D.D., and is particularly used to correct the tilt of a read image.

<Prior Art> When a document is read by an image reading device such as a CCD attached to an electronic file or facsimile, the image is sometimes tilted.

In order to correct the tilt of this image, conventionally each dot was rotated according to the nodding angle.

<Problems to be Solved by the Invention> However, when the inclination angle is corrected by rotating each dot in this way, there is a problem that it takes a long processing time.

Also, as long as the tilt is not too large, there will be no problem with the corrected image even if such strict correction is not performed.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide an image reading device that can perform tilt correction processing at high speed by correcting the tilt of an image in units of regions.

<Means for Solving the Problems> The image reading device of the present invention includes a storage means for storing image information, and a tilt instruction means for inputting information for correcting the tilt of the image information stored in the storage means. and image processing means for correcting the tilt of the image information by dividing the image information stored in the storage means into a plurality of regions and correcting the tilt for each region based on the information input by the tilt instruction means. It is equipped with

<Operation> In the image reading device of the present invention, the image information is divided into a plurality of regions, and the tilt of the image information is corrected by performing nodding correction for each region.

<Example> A detailed explanation will be given below based on the drawings.

FIG. 1 is a groove bottom diagram of an embodiment of an image reading device according to the present invention.

In the figure, reference numeral 1 denotes an input unit for inputting various commands, etc., and includes a tilt instruction unit 11 for inputting information and execution commands for correcting the tilt of an image. The tilt instructing unit 11 includes, for example, a tablet, a keyboard, a mouse, and the like.

Reference numeral 5 denotes a document reading section that reads the document and converts it into image information; 2 refers to a memory that stores the image information read by the document reading section;
Reference numeral 3 denotes a display section such as a CRT that displays image information read by the original reading section and stored in the memory 2.

Reference numeral 4 denotes an image processing section that performs image processing based on the tilt correction information input from the tilt instruction section 11.

6 is a CPU that controls the entire device.

Next, to explain the operation of this device, when there is an instruction to read the image information from the input section 1, the CPU 6 instructs the document reading section 5 to read the image information, and the read image information is written in a predetermined area of the memory 2. At the same time, the data is read out and displayed on the display section 3.

The operator determines the tilt state of the image from the image information displayed on the display section 3, and if tilt correction is necessary, inputs correction information and execution instructions from the tilt instruction section 11.

Based on the input from the tilt instruction section 11, the CPU 6 determines whether the image is tilted to the right or left, and causes the image processing section 6 to correct the image.

The specific operation of this image correction will be explained below.

First, the case where the image is tilted to the right by an angle θ as shown in FIG. 2 will be explained using the correction flowchart in FIG. 3 and the schematic diagrams in FIGS. 4 and 5.

Figure 4 is a schematic diagram showing correction of horizontal image shift (a
) is a diagram of the modified 11M, and (b) is a diagram after the modification.

As is clear from the figure, the image is divided into a plurality of regions in the horizontal direction. To explain in more detail, area 1 is a region where the tilt can be corrected by moving the image one dot to the left (in the negative direction of the The area where the tilt can be corrected is defined as one area. In this way, the areas are divided one after another, and up to area N is set.

As a general formula, the coordinates of the apex of area N are expressed as (Lx is the length of the document, LY is the vertical length of the document).

Based on this setting, the CPU 6 instructs the image processing unit 4 to translate the area surrounded by the coordinates obtained by substituting N=1 into the above general formula to the left by one dot, and the image processing unit 4 executes this ( Sl, 2). When the movement is finished, next is N+1
is set to N (S3), this newly set N indicates the last area n, and the movement to n-1 is completed. Then, in S4, area n is moved in the same manner as in 2, as shown in Fig. 4(a).
The horizontal direction processing is completed by changing from the state to the state shown in FIG. 4(b), and then the vertical direction processing is performed.

The general formula for the coordinates of each area after movement is It is.

Figure 5 is a schematic diagram showing the correction of the vertical image size n (a
) is the figure before modification, and (b') is the figure after modification.

As is clear from the figure, the image is divided into a plurality of regions in the vertical direction. To explain in more detail, area 1 is a region where the tilt can be corrected by moving the image one dot upward (in the positive direction of the Y axis), and area 2 is a region where the tilt can be corrected by moving the image two dots to the left. The part where the tilt can be corrected is defined as one area. In this way, each area is sequentially separated, and up to area N is set.

As a general formula, the coordinates of the vertices of region N are expressed as follows.

Based on this setting, the CPU 6 converts N=1 into the above general formula.
The image processing unit 4 is instructed to translate the area surrounded by the coordinates substituted in by one dot upward, and the image processing unit 4 executes this (S6.7).

When the movement is completed, N+1 is then set to N (S8), and the newly set N indicates the last area n, and the movement to n-1 is completed. Then, when it is determined in S9 that ≧LY, the process proceeds to 810, and the area n is moved in the same manner as in 5tanθ7, and the state shown in FIG. 5(a) is changed to the state shown in FIG. By completing the processing, the tilt correction is completed.

The general formula for the coordinates of each area after movement is t N EN = (-, N) FN = (), LY) tanθ It is expressed as

Next, a case where the image is shifted to the left by an angle θ will be described as shown in FIG.

FIG. 7 is a correction flowchart, and FIG. 8 is a schematic diagram showing correction of the horizontal image shift, where (a) is a diagram before correction, and (b) is a diagram after correction.

Figure @9 is a schematic diagram showing the correction of vertical image shift, (
(a) is a diagram before modification, and (b) is a diagram after modification.

4. The difference between the case where the image is shifted by an angle θ to the right in the correction operation and the case where processing is performed in the horizontal direction is clear by comparing Figs. 3 to 5 with Figs. 7 to 9. is translated to the right (positive direction of the X axis), and when processing in the vertical direction, it is moved downward (
The correction of the inclination is completed by performing the same operation only at the point that is translated in parallel (in the negative direction of the Y-axis).

In the above embodiment, the case where the tilt of the entire image is corrected was explained, but it is not limited to this.
It is also possible to perform tilt correction on only part of the image information.

<Effects of the Invention> As described above, the image reading device of the present invention can significantly shorten the processing time by dividing image information into a plurality of regions and performing the slope (F' positive) for each region.

Also, as long as the original image time signal is not very annoying, the corrected image information should be clear and natural (can be corrected).

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of an image reading device according to the present invention, FIGS. 2 and 6 are diagrams showing a tilted image and a time signal, and FIGS. 3 and 7 are correction operations of the same device. The flowchart shown in FIGS. 4, 5, 8, and 9 are schematic diagrams showing the state of image shift correction. 1: Input section, 11: Tilt instruction section, 2: Memory,
3: Display section, 4: Image processing section, 5: 1st manuscript reading section,
6: CPU Agent Patent Attorney Takeshi Sugiyama (1 person) Figure 2 Figure 4 (G) Cb) Figure 5 (σ)

Claims (1)

[Claims] 1. Storage means for storing image information; Tilt instruction means for inputting information for correcting the tilt of the image information stored in the storage means; and Information input by the tilt instruction means. image processing means for correcting the tilt of the image information by dividing the image information stored in the storage means into a plurality of regions based on the information, and correcting the tilt of the image information by performing tilt correction for each region; An image reading device characterized by correcting the tilt of image information stored in a storage means.