JPS6188656A - Picture reading method - Google Patents

Abstract

PURPOSE:To detect a correct speed by using a moving amount detected by an XY direction moving amount detector so as to obtain the speed change and tilt by manual feed operation thereby correcting a picture read by a linear image sensor. CONSTITUTION:A ball moving body 7-1 is moved in any direction on an original face. The X, Y direction moving amount detectors 7X, 7Y are provided incorporatedly with the linear image sensor 8. When the body moves from a state (i) to a state (ii), the output of the 7Y is zero and only the X direction moving amount detector 7X is activated. The number of lines of a read picture required for the moving amount (x) is read by the linear image sensor 8 and a distortion correction required for the correction of the speed and distortion such as a shift is outputted from a distortion correction transmission terminal 14. This enters a correction circuit 15 to apply required correction to the read signal from the linear image sensor 8 and a corrected picture is obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention was originally written in a manuscript n1. - This relates to an image reading method for obtaining photoelectric conversion signals for characters, figures, etc. by one hand feeding operation.

[Conventional technology]

FIG. 4 shows a conventional image reading method using manual feeding operation. In this figure, 1 is the original, and 2 is the original II/c or r.
t, y, - characters, figures, etc. (hereinafter simply referred to as characters). 3 is a lens optical system, which uses a spherical lens and a focusing fiber lens. Reference numeral 4 is a light source for illuminating the original, and a solid-state light source such as a tungsten lamp or an LED is used. 5-
1.5-2 is the 1st. A second sensor (hereinafter simply referred to as sensor), C
Thin film photoelectric conversion elements such as dS, Cd's or COD,
A St element such as a MOS is used.

The reading method is indicated by arrow 6, and by moving L2, the sensor 5
-1.5-2 is the original IK source through the lens optical system 3.
y=Character 2 (for example, A”) is read.

The operation of the reading method at this time is shown in Figure 5 (a).
), (b). When the sensors 5-1 and 5-2 are arranged at intervals and are moving in the direction of the arrow 6, FIG. 5(a) shows the moving state when the sensor 5-IK "black" is detected.
FIG. 5(b) shows a normal moving state in which the sensor 5-2K is detected as "black".

From the moving state in FIG. 5(a) to the moving state 11 in FIG. 5(b)
! When the AK changes, the basic scanning number N0 is expressed as N0=nXD, where n is the linear density in the Y movement direction. Kon
If the moving speed corresponding to lc is 'kVo' and the number of scans during the actual manual feeding operation is YN, then from rLVc the ratio of the basic number of scans N0 to the actual number of scans N is N, /N.
If the moving speed is set to n, a character equal to the character n obtained when moving at the basic feed speed is obtained.

Furthermore, even after the state shown in FIG. 5(b), character 2 can be read by performing the same processing assuming that the moving speed (2) remains constant.

[Problem that the invention seeks to solve]

In the conventional image reading method as described above, speed is detected only when the pixels on the sensor 5-1, 5-2 change from white to black. When r( is large, etc.), there are disadvantages in that the speed detection cannot sufficiently follow up, and distortion occurs in the image due to fluctuations and fluctuations caused by manual operation.

There is a drawback that two expensive one-dimensional image sensors are required for speed control.

This invention overcomes these drawbacks! Solve f second nT
The purpose of this invention is to provide an image reading method so that the correct speed can always be detected.

[Kth way to solve the problem]

In the image reading method according to the present invention, a one-dimensional image sensor for reading a document is provided with a movement amount detector for detecting the amount of movement in the X direction and the Y direction.
There is a method to correct the read image by detecting the shift and inclination using the moving detector and determining it using a constant moving detector.

[Effect]

In this invention, when the one-dimensional image is moved, the movement amount detector detects the amount of movement l in the X direction and the Y direction, so changes in speed, inclination, etc. are detected from the values.
Image correction is performed based on.

〔Example〕

FIG. 1 shows an embodiment of the present invention.

? -1 is a ball-shaped moving body f such as a pointing device, and is movable in any direction on the document surface. 7X is a movement amount detector in the X direction, and IY is a movement amount detector in the Y direction. However, the X direction is the direction of movement left and right with respect to the sensor.

The Y direction represents the direction in which the sensor moves up and down. 8 is a one-dimensional image sensor, and movement amount detector 7X
, 7Y are integrated. 9 is 5K as shown by the arrow
10 is a trajectory that moves parallel to the X direction, and θ is a trajectory that moves diagonally. represents the inclination when moving diagonally. Reference numeral 11 designates an X-direction movement amount calculation circuit, 12 a Y-direction movement amount calculation circuit, 13 a calculation circuit for calculating the slope t based on the movement amounts in the X and Y directions, 14 a distortion correction transmission terminal, and 15 a correction circuit.

The starting position is shown in the state, and the starting position is shown in the state (11
) shows the state when moving parallel to the arrow direction shown by trajectory 9. The state (ilD is indicated by the locus 10 in the diagonal direction and shows the state when moving in the direction of the fixed arrow).

Next K, these actions! explain.

First, when moving from state (1) to state (II) VC, K
is moving in parallel, so the movement amount detector 7Y in the Y direction
has a value of 0, and only the movement amount detector 7X in the X direction operates.

At this time, the number of lines of the read image required for the amount of movement san, kon enters the correction circuit 16,
A read signal W6b from the one-dimensional image sensor 8 is subjected to extensive correction l to obtain a corrected image.・Actually, the movement amount detectors 7X and 7Y use variable resistor tubes, and the resistance value is set to Km so that the resistance value changes in conjunction with the movement of the moving body 7-1. Change YX direction movement amount calculation circuit 11 and Y direction movement amount calculation circuit 12f
It is converted into the number of pulses according to the amount of movement from f. By counting the number of pulses t, the moving amounts X and y can be determined.

Next, when moving diagonally from state (1) to state (+;:)K, the movement amount detector 7X in both the X and Y directions.

7Y is activated, the movement Rxry is determined, and the r calculation circuit 13 determines the slope θo=tan'y/x'11. The correction method is slope θ. One-dimensional image sensor 8 according to
Shift the read image to obtain an undistorted image. Another embodiment of the present invention is shown in FIG. 2, in which speed changes are corrected by the amount of movement in the X direction as described above. This shows the state of the yun that occurs when the manual feed operation is performed. here,
16.16' indicates the direction of movement, and the inclination at that time is nθ8. Let it be θ3.

The moving state moves from state (1) to state (1■)K, and further moves to state (V)K. X and Y movement amount detector in initial state? X and 7Y have a value of 0.

When moving to state (IV)K due to this rL, the obtained inclination θ1 becomes a negative value, and the image read by the one-dimensional image sensor 8 is reversely shifted to obtain an image without distortion.

When moving from state (1■) to state (V) K, it is the same as moving in the diagonal direction shown in Fig. 1, and the inclination θ2
The image is shifted and corrected accordingly.

Therefore, it is possible to determine and correct the inclination and movement i' of the image when scanning the image in a single-handed motion, scanning in an arc, etc.

FIG. 3 shows still another embodiment of the invention.

In the embodiment shown in FIGS. 1 and 2, the manual feeding operation is performed by moving the document surface perpendicularly and parallelly to the one-dimensional image sensor 8. A moving body is provided at both ends of the one-dimensional image sensor 8 in the length direction. This makes it possible to correct the read image when performing a rough operation from the beginning or just before the end of a manual operation.

This url will be explained below.

In FIG. 3, parts ζ that are the same as the first part 1 are given the same reference numerals. 7-2 is the same moving body as the above-mentioned moving body 7-1, and 7'X and ? 'Y is a movement amount detector in the X direction and the Y direction. The robot moves from the moving state (1) to (11), and at this time performs the same operation as shown in FIG. Moving state (I
When moving from I) to (VD) and on time, the moving body 7-IY is rotated in the direction of arrow 17 at an inclination of θ.

At this time, the moving body 7-2 is detected by a movement amount XI I in the X direction and a movement t Y + in the Y direction. At this time, the slope α
is expressed as α=jan')'+/x1. Therefore, by detecting the slope α, the actual slope θ3 can be determined as θ−=2α. The image read by the one-dimensional image sensor 8 from this f'IK is given an inclination θ,
By performing bit shifting using VC, it is possible to correct a distorted read image. Although not shown, the movable body 7 also
It is possible to calculate and correct n'% from the difference in the positional relationship between -1 and 7-2.

〔Effect of the invention〕

As explained above, in this invention, since the movement amount detector t in the X and Y directions is provided in the one-dimensional image sensor, the distortion of the read image due to speed change due to manual feeding operation, etc. can be detected by the amount of movement in the X and Y directions. Distortion correction can be performed from the constant movement amount determined by the detector. 10X.

By attaching movement amount detectors in the Y direction to both sides of the one-dimensional image sensor in the length direction, it is possible to compensate for errors such as when the manual feed operation is tilted or when the manual operation is about to end. , there is an advantage that the read image can be obtained as an image without distortion and close to the original image.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the configuration of one embodiment of the present invention and a diagram showing a circuit pull-down, Fig. 2 is a schematic diagram of the configuration of another embodiment of the invention, and Fig. 3 is a diagram showing still another embodiment of the invention. FIG. 4 is an explanatory diagram showing a conventional image reading method, and FIGS. 5(a) and 5(b) are diagrams showing the relationship between characters and sensors in the conventional example of FIG. 4. . In the figure, 7-1, 7-2 is a moving body, 7X and 7Y are movement amount detectors, 8 is a one-dimensional image sensor, and 9° and 10 are loci.

Claims (2)

[Claims] (1) In a system for reading images of characters, figures, etc. written on a document by manual feeding, the one-dimensional image sensor that reads the document is equipped with a movement amount detector that detects the amount of movement in the X and Y directions. Speed change due to feed operation,
The inclination is determined by the amount of movement detected by the amount of movement detector,
An image reading method characterized in that the image read by the one-dimensional image sensor is thereby corrected. (2) The image reading method according to claim (1), wherein the X-direction and Y-direction movement amount detectors are respectively provided at both ends of the one-dimensional image sensor in the length direction. .